*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;background:#030012;color:#f1f5f9;overflow-x:hidden;line-height:1.7;font-size:18px}
::-webkit-scrollbar{width:7px}
::-webkit-scrollbar-track{background:#0a001a}
::-webkit-scrollbar-thumb{background:#4c1d95;border-radius:99px}
::-webkit-scrollbar-thumb:hover{background:#7c3aed}
/* NAV */
#nav{position:fixed;top:36px;left:0;right:0;z-index:1000;height:52px;display:flex;align-items:center;gap:.5rem;padding:0 1.25rem;background:rgba(3,0,18,0.9);backdrop-filter:blur(24px) saturate(180%);border-bottom:1px solid rgba(139,92,246,0.15)}
.nav-brand{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:1rem;white-space:nowrap;background:linear-gradient(90deg,#a855f7,#38bdf8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;flex-shrink:0}
.nav-cur-section{font-family:'JetBrains Mono',monospace;font-size:0.74rem;color:#64748b;letter-spacing:.12em;text-transform:uppercase;opacity:.7;flex:1;padding-left:.75rem}
/* Hamburger button */
#hamburger-btn{font-size:1.25rem;color:#94a3b8;background:none;border:1px solid rgba(139,92,246,0.3);border-radius:7px;padding:.18rem .52rem;cursor:pointer;transition:all .2s;line-height:1;flex-shrink:0}
#hamburger-btn:hover,#hamburger-btn.open{color:#a855f7;border-color:#a855f7;background:rgba(168,85,247,0.12)}
/* Search button in nav */
.nav-search-btn{font-family:'Space Grotesk',sans-serif;font-size:.74rem;color:#94a3b8;background:none;border:1px solid rgba(139,92,246,0.2);border-radius:99px;padding:.2rem .65rem;cursor:pointer;display:inline-flex;align-items:center;gap:.3rem;transition:all .2s;white-space:nowrap;flex-shrink:0}
.nav-search-btn:hover{color:#e2e8f0;background:rgba(139,92,246,0.15)}
/* ── SHORTCUT HINT ───────────────────────────────────────── */
#shortcut-hint{position:fixed;bottom:1.5rem;left:1.5rem;z-index:998;font-family:'JetBrains Mono',monospace;font-size:.6rem;color:#6366f1;opacity:.45;pointer-events:none;letter-spacing:.06em}

/* ── SEARCH MODAL ────────────────────────────────────────── */
#search-modal{position:fixed;inset:0;z-index:2000;display:none;align-items:flex-start;justify-content:center;padding-top:80px;background:rgba(0,0,0,.68);backdrop-filter:blur(9px)}
#search-modal.open{display:flex;animation:mFadeIn .2s ease}
@keyframes mFadeIn{from{opacity:0;transform:translateY(-14px)}to{opacity:1;transform:translateY(0)}}
#search-box{background:#060010;border:1px solid rgba(139,92,246,.45);border-radius:14px;width:min(660px,94vw);max-height:73vh;overflow:hidden;display:flex;flex-direction:column;box-shadow:0 0 0 1px rgba(99,102,241,.18),0 28px 80px rgba(0,0,0,.65),0 0 70px rgba(139,92,246,.14)}
#search-input-wrap{display:flex;align-items:center;gap:.65rem;padding:.95rem 1.3rem;border-bottom:1px solid rgba(139,92,246,.22)}
#search-icon-lbl{font-size:1.1rem;color:#7c3aed}
#search-input{flex:1;background:none;border:none;outline:none;font-family:'Space Grotesk',sans-serif;font-size:.97rem;color:#e2e8f0}
#search-input::placeholder{color:#3d3d5c}
#search-kbd{font-family:'JetBrains Mono',monospace;font-size:.6rem;color:#6366f1;background:rgba(99,102,241,.1);border:1px solid rgba(99,102,241,.3);padding:.1rem .38rem;border-radius:4px}
#search-results{overflow-y:auto;max-height:58vh;padding:.5rem}
.sr-item{display:flex;align-items:center;gap:.85rem;padding:.7rem .9rem;border-radius:9px;cursor:pointer;transition:all .15s}
.sr-item:hover,.sr-item:focus{background:rgba(99,102,241,.14);outline:none;transform:translateX(3px)}
.sr-icon{font-size:1.1rem;flex-shrink:0;width:1.5rem;text-align:center}
.sr-title{font-size:.88rem;color:#e2e8f0;font-weight:500;line-height:1.3}
.sr-meta{font-size:.73rem;color:#64748b;margin-top:.12rem}
.sr-section{font-size:.65rem;font-family:'JetBrains Mono',monospace;text-transform:uppercase;letter-spacing:.1em;color:#7c3aed;margin-left:auto;white-space:nowrap;flex-shrink:0;padding:.15rem .42rem;border:1px solid rgba(124,58,237,.28);border-radius:4px;background:rgba(124,58,237,.08)}
.sr-empty{color:#475569;font-size:.85rem;text-align:center;padding:2.5rem 1rem;font-family:'JetBrains Mono',monospace;letter-spacing:.04em}
.sr-empty::before{display:block;font-size:1.6rem;margin-bottom:.5rem;content:'✦'}
#search-results mark{background:rgba(139,92,246,.32);color:#e2e8f0!important;border-radius:3px;padding:0 2px}

/* ── ANIMATED CARD SHIMMER ───────────────────────────────── */
@keyframes glowPulse{
  0%,100%{box-shadow:0 0 0 2px var(--gc,#6366f1),0 10px 48px var(--gs,rgba(99,102,241,.25)),0 0 28px var(--gp,rgba(99,102,241,.12))}
  50%{box-shadow:0 0 0 2.5px var(--gc,#6366f1),0 14px 70px var(--gs,rgba(99,102,241,.4)),0 0 50px var(--gp,rgba(99,102,241,.22))}
}
@keyframes shimmerCard{0%{background-position:200% center}100%{background-position:-200% center}}

/* Shimmer layer on all main cards */
.ug-card,.grad-card,.res-card,.puz-card,.op-card,.car-card,.prob-card,.fact-card,.myth-card{position:relative;overflow:hidden}
.ug-card::after,.grad-card::after,.res-card::after,.puz-card::after,.op-card::after,.car-card::after{
  content:'';position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(105deg,transparent 42%,rgba(255,255,255,.045) 50%,transparent 58%);
  background-size:200% 100%;opacity:0;transition:opacity .3s;border-radius:inherit;
}
.ug-card:hover::after,.grad-card:hover::after,.res-card:hover::after,.puz-card:hover::after,.op-card:hover::after,.car-card:hover::after{
  opacity:1;animation:shimmerCard 1.6s ease forwards;
}

/* Badge pulse colors */
@keyframes badgeGlow{0%,100%{filter:brightness(1)}50%{filter:brightness(1.25)}}
.rb-breakthrough{animation:badgeGlow 2s ease-in-out infinite}
.rb-active{animation:badgeGlow 3s ease-in-out infinite}

/* More vivid section titles */
.s-title{transition:text-shadow .3s}
.s-head:hover .s-title{text-shadow:0 0 40px currentColor;filter:brightness(1.08)}

/* Vivid hover on nav links */
#nav button.nav-a:hover{
  background:rgba(139,92,246,.18)!important;
  color:#c4b5fd!important;
  border-color:rgba(139,92,246,.5)!important;
}

/* Colorful card background on hover (subtle) */
.ug-card:hover{background:rgba(99,102,241,.1)!important;border-color:rgba(99,102,241,.38)!important}
.grad-card:hover{background:rgba(168,85,247,.1)!important;border-color:rgba(168,85,247,.38)!important}
.res-card:hover{background:rgba(14,165,233,.1)!important;border-color:rgba(14,165,233,.38)!important}
.op-card:hover{background:rgba(239,68,68,.08)!important;border-color:rgba(239,68,68,.35)!important}
.car-card:hover{background:rgba(139,92,246,.1)!important;border-color:rgba(139,92,246,.38)!important}
.puz-card:hover{background:rgba(6,182,212,.09)!important;border-color:rgba(6,182,212,.35)!important}
.prob-card:hover{background:rgba(245,158,11,.07)!important;border-color:rgba(245,158,11,.32)!important}

/* Hamburger dropdown */
#hamburger-menu{position:fixed;top:88px;right:0;width:235px;max-height:calc(100vh - 88px);overflow-y:auto;background:rgba(3,0,18,0.97);backdrop-filter:blur(28px) saturate(200%);border-left:1px solid rgba(139,92,246,0.2);border-bottom:1px solid rgba(139,92,246,0.2);border-radius:0 0 0 14px;z-index:999;padding:.45rem 0;display:none;flex-direction:column;box-shadow:-6px 6px 32px rgba(0,0,0,.45)}
#hamburger-menu.open{display:flex;animation:hmIn .18s ease}
@keyframes hmIn{from{opacity:0;transform:translateX(10px)}to{opacity:1;transform:translateX(0)}}
#hamburger-menu .hm-item{font-family:'Space Grotesk',sans-serif;font-size:.84rem;font-weight:500;color:#94a3b8;background:none;border:none;text-align:left;padding:.55rem 1.2rem;cursor:pointer;transition:all .18s;white-space:nowrap;display:flex;align-items:center;gap:.55rem}
#hamburger-menu .hm-item:hover{color:#e2e8f0;background:rgba(139,92,246,0.15)}
#hamburger-menu .hm-item.active{color:#e9d5ff;background:rgba(139,92,246,0.22);font-weight:600}
#hamburger-menu .hm-divider{height:1px;background:rgba(139,92,246,0.12);margin:.3rem .8rem}
body.light-mode #hamburger-menu{background:rgba(250,247,242,0.98)!important;border-color:rgba(124,58,237,0.15)!important}
body.light-mode #hamburger-menu .hm-item{color:#44403c!important}
body.light-mode #hamburger-menu .hm-item:hover{color:#1c1410!important;background:rgba(124,58,237,0.08)!important}
body.light-mode #hamburger-menu .hm-item.active{color:#5b21b6!important;background:rgba(124,58,237,0.12)!important}
body.light-mode #hamburger-btn{color:#44403c!important;border-color:rgba(124,58,237,0.25)!important}
body.light-mode #hamburger-btn.open,body.light-mode #hamburger-btn:hover{color:#5b21b6!important;border-color:#7c3aed!important;background:rgba(124,58,237,0.1)!important}
/* HERO */
#hero{position:relative;height:100vh;min-height:600px;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden;background:#000008}
#starCanvas{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.hero-inner{position:relative;z-index:2;padding:2rem;max-width:880px}
.hero-eyebrow{font-family:'JetBrains Mono',monospace;font-size:0.72rem;letter-spacing:0.35em;text-transform:uppercase;color:#7c3aed;margin-bottom:1.25rem;display:block}
.hero-title{font-family:'Playfair Display',serif;font-weight:900;font-size:clamp(3.5rem,10vw,7.5rem);line-height:0.97;background:linear-gradient(145deg,#f1f5f9 0%,#c4b5fd 35%,#38bdf8 70%,#f0abfc 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:1rem}
.hero-eq{font-family:'JetBrains Mono',monospace;font-size:1.1rem;color:rgba(196,181,253,0.65);margin-bottom:1.5rem;letter-spacing:0.08em}
.hero-sub{font-size:1.05rem;color:#dde6f0;max-width:560px;margin:0 auto 2.5rem;line-height:1.8}
.hero-btn{display:inline-flex;align-items:center;gap:0.5rem;background:linear-gradient(135deg,#7c3aed,#6d28d9,#1d4ed8,#0ea5e9);background-size:300% 300%;color:#fff;text-decoration:none;padding:0.9rem 2.25rem;border-radius:100px;font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:0.9rem;letter-spacing:0.04em;transition:transform 0.2s,box-shadow 0.2s;box-shadow:0 4px 28px rgba(124,58,237,0.5);animation:heroBtn 5s ease-in-out infinite;border:none;cursor:pointer}
.hero-btn:hover{transform:translateY(-4px) scale(1.04);box-shadow:0 14px 55px rgba(124,58,237,0.8),0 0 35px rgba(56,189,248,0.35)}
@keyframes heroBtn{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}
/* SHARED SECTION */
.section{padding:5.5rem 1.5rem}
.s-inner{max-width:1180px;margin:0 auto}
.s-head{text-align:center;margin-bottom:3.5rem}
.s-eyebrow{display:inline-block;font-family:'JetBrains Mono',monospace;font-size:0.76rem;letter-spacing:0.3em;text-transform:uppercase;margin-bottom:0.75rem;padding:0.2rem 0.75rem;border-radius:99px}
.s-title{font-family:'Playfair Display',serif;font-weight:700;font-size:clamp(2rem,4.5vw,3.2rem);line-height:1.15;margin-bottom:0.9rem}
.s-desc{font-size:1.07rem;max-width:680px;margin:0 auto;line-height:1.8;color:#dde6f0}
/* GRIDS */
.g3{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.2rem;align-items:start}
.g4{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:1rem;align-items:start}
.g2{display:grid;grid-template-columns:repeat(auto-fill,minmax(430px,1fr));gap:1.5rem;align-items:start}
/* INTRO */
#intro{background:linear-gradient(160deg,#0f0a2e 0%,#180a3a 50%,#0a1828 100%)}
.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
.intro-prose p{font-size:1.1rem;line-height:1.9;color:#dde6f0;margin-bottom:1.2rem}
.intro-prose p:first-child::first-letter{font-family:'Playfair Display',serif;font-size:3.5rem;font-weight:700;float:left;line-height:0.85;margin:0.2rem 0.15rem 0 0;color:#a855f7}
.myth-card{background:rgba(124,58,237,0.07);border:1px solid rgba(124,58,237,0.18);border-radius:11px;padding:1.25rem;margin-bottom:0.85rem}
.myth-label{font-family:'JetBrains Mono',monospace;font-size:0.76rem;color:#f59e0b;text-transform:uppercase;letter-spacing:0.1em;margin-bottom:0.4rem}
.myth-truth{font-size:0.93rem;color:#dde6f0;line-height:1.7}
/* BOOKS */
#books{background:#0d0800}
#books .s-eyebrow{background:rgba(217,119,6,0.12);color:#fbbf24;border:1px solid rgba(217,119,6,0.25)}
#books .s-title{color:#fef3c7}
.book-card{background:rgba(217,119,6,0.09);border:1px solid rgba(217,119,6,0.22);border-radius:13px;padding:1.3rem;transition:all 0.22s}
.book-card:hover{background:rgba(217,119,6,0.15);border-color:rgba(217,119,6,0.45);transform:translateY(-4px);box-shadow:0 12px 36px rgba(217,119,6,0.22)}
.book-title{font-family:'Playfair Display',serif;font-weight:700;font-size:1.05rem;color:#fef3c7;margin-bottom:0.2rem;line-height:1.4}
.book-author{font-size:0.84rem;color:#f59e0b;margin-bottom:0.2rem;font-style:italic}
.book-year{font-family:'JetBrains Mono',monospace;font-size:0.72rem;color:#6b5239;margin-bottom:0.45rem}
.book-desc{font-size:0.88rem;color:#d6d3d1;line-height:1.68}
.book-cat{display:inline-block;font-size:0.68rem;padding:0.12rem 0.45rem;border-radius:99px;margin-top:0.45rem;font-family:'Space Grotesk',sans-serif;background:rgba(217,119,6,0.18);color:#fbbf24;letter-spacing:0.04em}
/* PUZZLES */
#puzzles{background:#001212}
#puzzles .s-eyebrow{background:rgba(6,182,212,0.08);color:#22d3ee;border:1px solid rgba(6,182,212,0.22)}
#puzzles .s-title{color:#cffafe}
.puz-card{background:rgba(6,182,212,0.04);border:1px solid rgba(6,182,212,0.13);border-radius:11px;overflow:hidden;transition:all 0.22s}
.puz-card:hover{border-color:rgba(6,182,212,0.35);box-shadow:0 4px 20px rgba(6,182,212,0.08)}
.puz-hdr{padding:1.1rem 1.15rem;cursor:pointer;display:flex;justify-content:space-between;align-items:flex-start;gap:0.75rem}
.puz-title{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:1.0rem;color:#cffafe;margin-bottom:0.3rem}
.puz-meta{display:flex;gap:0.4rem;align-items:center;flex-wrap:wrap}
.puz-src{font-size:0.72rem;color:#06b6d4;background:rgba(6,182,212,0.1);padding:0.1rem 0.4rem;border-radius:99px;font-family:'Space Grotesk',sans-serif}
.puz-diff{font-size:0.78rem;color:#22d3ee}
.puz-arr{color:#06b6d4;font-size:0.9rem;flex-shrink:0;transition:transform 0.3s;margin-top:0.15rem}
.puz-body{display:none;padding:0 1.15rem 1.15rem}
.puz-q{font-size:0.95rem;color:#a5f3fc;line-height:1.8;margin-bottom:0.85rem;padding:0.7rem 0.85rem;background:rgba(6,182,212,0.05);border-radius:7px;border-left:3px solid #06b6d4}
.puz-hint{font-size:0.87rem;color:#7dd3fc;margin-bottom:0.65rem;line-height:1.65}
.puz-ans{font-size:0.87rem;color:#d1fae5;background:rgba(16,185,129,0.07);padding:0.7rem 0.85rem;border-radius:7px;border-left:3px solid #10b981;line-height:1.7}
/* PRE-COLLEGE */
#precollege{background:#000e1a}
#precollege .s-eyebrow{background:rgba(59,130,246,0.08);color:#60a5fa;border:1px solid rgba(59,130,246,0.22)}
#precollege .s-title{color:#dbeafe}
.pc-card{background:rgba(59,130,246,0.04);border:1px solid rgba(59,130,246,0.13);border-radius:11px;padding:1.2rem;transition:all 0.22s}
.pc-card:hover{border-color:rgba(59,130,246,0.35);transform:translateY(-2px)}
.pc-grade{font-family:'JetBrains Mono',monospace;font-size:0.68rem;color:#3b82f6;background:rgba(59,130,246,0.1);padding:0.1rem 0.4rem;border-radius:4px;display:inline-block;margin-bottom:0.45rem}
.pc-topic{font-family:'Space Grotesk',sans-serif;font-weight:700;color:#93c5fd;font-size:1.0rem;margin-bottom:0.25rem}
.pc-sub{font-size:0.85rem;color:#94a3b8;margin-bottom:0.65rem;line-height:1.62}
.pc-book{font-size:0.86rem;color:#bfdbfe;margin-bottom:0.2rem}
.pc-book span{color:#94a3b8;font-size:0.8rem}
/* OLYMPIAD */
#olympiad{background:#0c0600}
#olympiad .s-eyebrow{background:rgba(245,158,11,0.08);color:#fcd34d;border:1px solid rgba(245,158,11,0.22)}
#olympiad .s-title{color:#fef9c3}
.oly-tabs{display:flex;flex-wrap:wrap;gap:0.85rem;margin:1.75rem 0}
.oly-tab{font-family:'Space Grotesk',sans-serif;font-size:1.05rem;font-weight:700;padding:0.95rem 1.6rem;border-radius:14px;border:2px solid rgba(245,158,11,0.2);background:rgba(245,158,11,0.06);color:#b45309;cursor:pointer;transition:all 0.2s ease}
.oly-tab:hover{background:rgba(245,158,11,0.15);border-color:rgba(245,158,11,0.45);color:#fcd34d;transform:translateY(-2px);box-shadow:0 6px 16px rgba(245,158,11,0.15)}
.oly-tab.active{background:rgba(245,158,11,0.2);border-color:#f59e0b;color:#fef08a;box-shadow:0 6px 22px rgba(245,158,11,0.32);transform:translateY(-1px)}
.oly-panel{display:none}
.oly-panel.active{display:block}
.oly-phd{display:grid;grid-template-columns:1.7fr 1fr;gap:2rem;margin-bottom:1.75rem;align-items:start}
.oly-desc{font-size:0.97rem;color:#d6d3d1;line-height:1.82;margin-bottom:0.75rem}
.oly-bk-box{background:rgba(245,158,11,0.05);border:1px solid rgba(245,158,11,0.14);border-radius:10px;padding:1rem}
.oly-bk-lbl{font-family:'JetBrains Mono',monospace;font-size:0.67rem;text-transform:uppercase;letter-spacing:0.12em;color:#f59e0b;margin-bottom:0.7rem}
.oly-bk-item{margin-bottom:0.65rem;padding-bottom:0.65rem;border-bottom:1px solid rgba(245,158,11,0.08)}
.oly-bk-item:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}
.oly-bk-t{font-family:'Space Grotesk',sans-serif;font-size:0.87rem;font-weight:600;color:#fcd34d}
.oly-bk-a{font-size:0.78rem;color:#b45309;margin-bottom:0.1rem}
.oly-bk-n{font-size:0.75rem;color:#78716c;font-style:italic}
.prob-list{display:flex;flex-direction:column;gap:0.65rem}
.prob-card{background:rgba(245,158,11,0.03);border:1px solid rgba(245,158,11,0.1);border-radius:9px;overflow:hidden}
.prob-hdr{padding:0.8rem 0.95rem;cursor:pointer;display:flex;align-items:center;gap:0.65rem}
.prob-num{font-family:'JetBrains Mono',monospace;font-size:0.72rem;color:#f59e0b;background:rgba(245,158,11,0.1);padding:0.18rem 0.42rem;border-radius:4px;flex-shrink:0;margin-top:0.1rem}
.prob-ttl{font-size:0.95rem;font-weight:600;color:#fef3c7;flex:1;font-family:'Space Grotesk',sans-serif;line-height:1.4}
.prob-dif{font-size:0.87rem;flex-shrink:0;letter-spacing:-0.05em}
.prob-src-lbl{font-size:0.72rem;color:#78716c;font-family:'JetBrains Mono',monospace;text-align:right}
.prob-body{display:none;padding:0 0.95rem 0.95rem}
.prob-stmt{font-size:0.93rem;color:#fef3c7;line-height:1.78;margin-bottom:0.7rem;padding:0.7rem 0.85rem;background:rgba(245,158,11,0.05);border-radius:7px;border-left:3px solid #f59e0b}
.prob-insight{font-size:0.89rem;color:#d6d3d1;line-height:1.78;background:rgba(16,185,129,0.05);padding:0.7rem 0.85rem;border-radius:7px;border-left:3px solid #10b981}
.ins-lbl{font-family:'JetBrains Mono',monospace;font-size:0.67rem;text-transform:uppercase;letter-spacing:0.12em;color:#10b981;margin-bottom:0.3rem}
/* UNDERGRAD */
#undergrad{background:#00050e}
#undergrad .s-eyebrow{background:rgba(99,102,241,0.08);color:#a5b4fc;border:1px solid rgba(99,102,241,0.22)}
#undergrad .s-title{color:#e0e7ff}
.ug-card{background:rgba(99,102,241,0.04);border:1px solid rgba(99,102,241,0.13);border-radius:11px;padding:1.2rem;transition:all 0.22s}
.ug-card:hover{border-color:rgba(99,102,241,0.35);transform:translateY(-2px);box-shadow:0 6px 20px rgba(99,102,241,0.08)}
.ug-tag{display:inline-block;font-size:0.68rem;padding:0.12rem 0.42rem;border-radius:4px;background:rgba(99,102,241,0.14);color:#818cf8;font-family:'Space Grotesk',sans-serif;margin-bottom:0.45rem}
.ug-topic{font-family:'Space Grotesk',sans-serif;font-weight:700;color:#c7d2fe;font-size:1.0rem;margin-bottom:0.35rem}
.ug-desc{font-size:0.87rem;color:#94a3b8;line-height:1.65;margin-bottom:0.65rem}
.ug-book{font-size:0.87rem;color:#a5b4fc;margin-bottom:0.22rem;line-height:1.5}
.ug-book b{color:#c7d2fe}
.ug-book i{color:#6366f1;font-style:normal}
/* GRADUATE */
#graduate{background:#07000e}
#graduate .s-eyebrow{background:rgba(168,85,247,0.08);color:#d8b4fe;border:1px solid rgba(168,85,247,0.22)}
#graduate .s-title{color:#f3e8ff}
.grad-card{background:rgba(168,85,247,0.04);border:1px solid rgba(168,85,247,0.13);border-radius:11px;padding:1.2rem;transition:all 0.22s}
.grad-card:hover{border-color:rgba(168,85,247,0.35);transform:translateY(-2px);box-shadow:0 6px 20px rgba(168,85,247,0.08)}
.grad-topic{font-family:'Space Grotesk',sans-serif;font-weight:700;color:#e9d5ff;font-size:1.0rem;margin-bottom:0.35rem}
.grad-desc{font-size:0.87rem;color:#94a3b8;line-height:1.65;margin-bottom:0.65rem}
.grad-book{font-size:0.87rem;color:#c4b5fd;margin-bottom:0.25rem;line-height:1.5}
.grad-book b{color:#e9d5ff}
/* RESEARCH */
#research{background:#000c17}
#research .s-eyebrow{background:rgba(14,165,233,0.08);color:#7dd3fc;border:1px solid rgba(14,165,233,0.22)}
#research .s-title{color:#e0f2fe}
.res-card{background:rgba(14,165,233,0.04);border:1px solid rgba(14,165,233,0.13);border-radius:11px;padding:1.35rem;transition:all 0.22s}
.res-card:hover{border-color:rgba(14,165,233,0.35);transform:translateY(-2px)}
.res-badge{font-family:'JetBrains Mono',monospace;font-size:0.68rem;letter-spacing:0.1em;text-transform:uppercase;padding:0.13rem 0.48rem;border-radius:99px;display:inline-block;margin-bottom:0.7rem}
.rb-breakthrough{background:linear-gradient(135deg,rgba(16,185,129,0.18),rgba(5,150,105,0.1));color:#34d399;border:1px solid rgba(16,185,129,0.38);animation:badgeGlow 2s ease-in-out infinite}
.rb-active{background:linear-gradient(135deg,rgba(14,165,233,0.18),rgba(2,132,199,0.1));color:#38bdf8;border:1px solid rgba(14,165,233,0.38);animation:badgeGlow 3s ease-in-out infinite}
.rb-open{background:rgba(245,158,11,0.13);color:#fcd34d;border:1px solid rgba(245,158,11,0.28)}
.res-title{font-family:'Playfair Display',serif;font-weight:700;color:#e0f2fe;font-size:1.07rem;margin-bottom:0.45rem;line-height:1.35}
.res-who{font-size:0.84rem;color:#0ea5e9;margin-bottom:0.2rem}
.res-inst{font-size:0.79rem;color:#334155;margin-bottom:0.65rem;font-style:italic}
.res-desc{font-size:0.9rem;color:#dde6f0;line-height:1.74}
/* OPEN PROBLEMS */
#openproblems{background:#060004}
#openproblems .s-eyebrow{background:rgba(239,68,68,0.08);color:#fca5a5;border:1px solid rgba(239,68,68,0.22)}
#openproblems .s-title{color:#fee2e2}
.op-card{background:rgba(239,68,68,0.03);border:1px solid rgba(239,68,68,0.1);border-radius:11px;overflow:hidden;transition:all 0.22s}
.op-card:hover{border-color:rgba(239,68,68,0.3);box-shadow:0 4px 18px rgba(239,68,68,0.08)}
.op-hdr{padding:1.1rem 1.15rem;cursor:pointer;display:flex;justify-content:space-between;align-items:flex-start;gap:0.75rem}
.op-title{font-family:'Playfair Display',serif;font-weight:700;color:#fecaca;font-size:1.03rem;margin-bottom:0.28rem;line-height:1.3}
.op-field{font-size:0.76rem;color:#ef4444;font-family:'Space Grotesk',sans-serif}
.op-prize{font-family:'JetBrains Mono',monospace;font-size:0.77rem;color:#fbbf24;background:rgba(251,191,36,0.1);padding:0.13rem 0.45rem;border-radius:4px;flex-shrink:0}
.op-arr{color:#ef4444;font-size:0.9rem;flex-shrink:0;transition:transform 0.3s;margin-top:0.15rem}
.op-body{display:none;padding:0 1.15rem 1.15rem}
.op-stmt{font-size:0.93rem;color:#fecaca;line-height:1.78;margin-bottom:0.7rem;padding:0.7rem;background:rgba(239,68,68,0.05);border-radius:7px;border-left:3px solid #ef4444}
.op-lbl{font-family:'JetBrains Mono',monospace;font-size:0.67rem;text-transform:uppercase;letter-spacing:0.12em;margin-bottom:0.25rem}
.op-why{font-size:0.88rem;color:#d1d5db;margin-bottom:0.6rem;line-height:1.7}
.op-how{font-size:0.88rem;color:#86efac;line-height:1.7;padding:0.6rem 0.75rem;background:rgba(16,185,129,0.06);border-radius:6px}
/* CAREERS */
#careers{background:#020015}
#careers .s-eyebrow{background:rgba(139,92,246,0.08);color:#c4b5fd;border:1px solid rgba(139,92,246,0.22)}
#careers .s-title{color:#ede9fe}
.car-card{background:rgba(139,92,246,0.05);border:1px solid rgba(139,92,246,0.13);border-radius:11px;padding:1.2rem;transition:all 0.22s}
.car-card:hover{border-color:rgba(139,92,246,0.35);transform:translateY(-2px);box-shadow:0 6px 20px rgba(139,92,246,0.08)}
.car-icon{font-size:1.65rem;margin-bottom:0.45rem;display:block}
.car-title{font-family:'Space Grotesk',sans-serif;font-weight:700;color:#ddd6fe;font-size:1.0rem;margin-bottom:0.45rem}
.car-desc{font-size:0.88rem;color:#dde6f0;line-height:1.68;margin-bottom:0.65rem}
.car-tag{display:inline-block;font-size:0.68rem;padding:0.12rem 0.42rem;border-radius:4px;background:rgba(139,92,246,0.14);color:#a78bfa;font-family:'Space Grotesk',sans-serif;margin-right:0.22rem;margin-bottom:0.22rem}
.car-sal{font-size:0.82rem;color:#8b5cf6;font-family:'JetBrains Mono',monospace;margin-top:0.35rem}
/* STUDY GUIDE */
#studyguide{background:#001008}
#studyguide .s-eyebrow{background:rgba(16,185,129,0.08);color:#6ee7b7;border:1px solid rgba(16,185,129,0.22)}
#studyguide .s-title{color:#d1fae5}
.tip-list{display:flex;flex-direction:column;gap:0.9rem}
.tip-card{display:flex;gap:1.1rem;align-items:flex-start;background:rgba(16,185,129,0.04);border:1px solid rgba(16,185,129,0.1);border-radius:11px;padding:1.1rem;transition:all 0.22s}
.tip-card:hover{border-color:rgba(16,185,129,0.28);background:rgba(16,185,129,0.07)}
.tip-num{font-family:'JetBrains Mono',monospace;font-size:1rem;font-weight:700;color:#10b981;background:rgba(16,185,129,0.1);width:2.4rem;height:2.4rem;border-radius:7px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.tip-title{font-family:'Space Grotesk',sans-serif;font-weight:700;color:#6ee7b7;font-size:1.0rem;margin-bottom:0.28rem}
.tip-desc{font-size:0.9rem;color:#dde6f0;line-height:1.74}
/* FACTS */
#facts{background:#060612}
#facts .s-eyebrow{background:rgba(236,72,153,0.08);color:#f9a8d4;border:1px solid rgba(236,72,153,0.22)}
#facts .s-title{color:#fce7f3}
.fact-card{background:var(--fc,rgba(255,255,255,0.03));border:1px solid var(--fb,rgba(255,255,255,0.08));border-radius:11px;padding:1.2rem;transition:all 0.22s;position:relative;overflow:hidden}
.fact-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--fa,#a855f7)}
.fact-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,0.3)}
.fact-cat{font-family:'JetBrains Mono',monospace;font-size:0.68rem;text-transform:uppercase;letter-spacing:0.12em;color:var(--fa,#a855f7);margin-bottom:0.45rem}
.fact-text{font-size:0.93rem;color:#e2e8f0;line-height:1.78;margin-bottom:0.4rem}
.fact-math{font-family:'JetBrains Mono',monospace;font-size:0.87rem;color:var(--fa,#a855f7);background:rgba(255,255,255,0.04);padding:0.3rem 0.55rem;border-radius:5px;display:inline-block;margin-top:0.2rem}
/* UNIVERSITIES */
#universities{background:#0f0800}
#universities .s-eyebrow{background:rgba(249,115,22,0.08);color:#fdba74;border:1px solid rgba(249,115,22,0.22)}
#universities .s-title{color:#ffedd5}
.uni-card{background:rgba(249,115,22,0.04);border:1px solid rgba(249,115,22,0.13);border-radius:11px;padding:1.2rem;transition:all 0.22s}
.uni-card:hover{border-color:rgba(249,115,22,0.35);transform:translateY(-2px);box-shadow:0 4px 18px rgba(249,115,22,0.08)}
.uni-tier{font-family:'JetBrains Mono',monospace;font-size:0.68rem;letter-spacing:0.1em;text-transform:uppercase;padding:0.1rem 0.42rem;border-radius:3px;display:inline-block;margin-bottom:0.45rem}
.t-elite{background:rgba(251,191,36,0.18);color:#fbbf24;border:1px solid rgba(251,191,36,0.28)}
.t-premier{background:rgba(249,115,22,0.18);color:#fb923c;border:1px solid rgba(249,115,22,0.28)}
.t-strong{background:rgba(239,68,68,0.13);color:#fca5a5;border:1px solid rgba(239,68,68,0.22)}
.uni-name{font-family:'Space Grotesk',sans-serif;font-weight:700;color:#fed7aa;font-size:0.99rem;margin-bottom:0.2rem}
.uni-city{font-size:0.8rem;color:#6b5239;margin-bottom:0.45rem}
.uni-prog{font-size:0.84rem;color:#d6d3d1;margin-bottom:0.25rem;line-height:1.5}
.uni-note{font-size:0.82rem;color:#92400e;font-style:italic;line-height:1.6}
/* THEME TOGGLE — fixed above back-to-top */
#theme-toggle{position:fixed;bottom:calc(1.5rem + 38px + 0.55rem);right:1.5rem;z-index:999;width:38px;height:38px;border-radius:50%;border:1px solid rgba(139,92,246,0.35);background:rgba(3,0,18,0.88);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);color:#a855f7;font-size:1.05rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all 0.25s;outline:none;box-shadow:0 2px 12px rgba(139,92,246,0.2);}
#theme-toggle:hover{background:rgba(124,58,237,0.22);transform:scale(1.08)}
/* BACK TO TOP */
#btt{position:fixed;bottom:1.5rem;right:1.5rem;z-index:999;width:38px;height:38px;border-radius:50%;border:1px solid rgba(139,92,246,0.28);background:rgba(3,0,18,0.85);backdrop-filter:blur(12px);color:#a855f7;font-size:0.9rem;cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity 0.3s;outline:none}
#btt.show{opacity:1}
#btt:hover{background:rgba(124,58,237,0.18)}
/* FIX: scroll-margin-top so fixed nav doesn't cover section headings on anchor navigation */

/* ═══ AUTH TOP BAR ═══════════════════════════════════════════ */
#auth-topbar{
  position:fixed;top:0;left:0;right:0;z-index:1100;
  height:36px;display:flex;align-items:center;gap:0.5rem;
  padding:0 1.25rem;
  background:rgba(2,0,14,0.97);
  backdrop-filter:blur(20px) saturate(160%);
  border-bottom:1px solid rgba(139,92,246,0.25);
}

.atb-btn{
  font-family:'Space Grotesk',sans-serif;font-size:0.68rem;font-weight:500;
  padding:0.22rem 0.65rem;border-radius:99px;cursor:pointer;
  transition:all 0.2s;white-space:nowrap;text-decoration:none;display:inline-flex;align-items:center;gap:0.3rem;
}
.atb-home{
  color:#dde6f0;background:rgba(255,255,255,0.04);
  border:1px solid rgba(255,255,255,0.08);
}
.atb-home:hover{color:#e2e8f0;background:rgba(255,255,255,0.09);border-color:rgba(255,255,255,0.15)}
.atb-signin{
  color:#c4b5fd;background:rgba(139,92,246,0.12);
  border:1px solid rgba(139,92,246,0.3);
}
.atb-signin:hover{background:rgba(139,92,246,0.22);border-color:rgba(139,92,246,0.5)}
#userInfo{align-items:center;gap:0.4rem}
.atb-username{
  font-family:'Space Grotesk',sans-serif;font-size:0.68rem;font-weight:600;
  color:#34d399;background:rgba(16,185,129,0.1);
  border:1px solid rgba(16,185,129,0.25);
  padding:0.22rem 0.65rem;border-radius:99px;
}
.atb-signout{
  font-family:'Space Grotesk',sans-serif;font-size:0.62rem;font-weight:500;
  color:#94a3b8;background:none;border:1px solid rgba(100,116,139,0.2);
  padding:0.18rem 0.5rem;border-radius:99px;cursor:pointer;transition:all 0.2s;
}
.atb-signout:hover{color:#fca5a5;border-color:rgba(239,68,68,0.3);background:rgba(239,68,68,0.06)}

/* Undergrad / Graduate expandable detail */
.ug-detail,.grad-detail{
  display:none;margin-top:0.85rem;padding-top:0.85rem;
  border-top:1px solid rgba(99,102,241,0.15);
  font-size:0.89rem;color:#dde6f0;line-height:1.8
}
.grad-detail{border-color:rgba(168,85,247,0.15)}
.ug-detail p,.grad-detail p{margin-bottom:0.7rem}
.ug-detail p:last-child,.grad-detail p:last-child{margin-bottom:0}
.ug-detail em,.grad-detail em{color:#c7d2fe}
.grad-detail em{color:#e9d5ff}
body.light-mode .grad-detail em{color:#5b21b6!important;font-weight:500}
.ug-expand-lbl,.grad-expand-lbl{
  display:inline-flex;align-items:center;gap:0.3rem;
  font-size:0.68rem;font-family:'JetBrains Mono',monospace;
  letter-spacing:0.08em;text-transform:uppercase;margin-top:0.65rem;
  cursor:pointer;color:#6366f1;transition:color 0.2s;
}
.grad-expand-lbl{color:#a855f7}
.ug-expand-lbl:hover{color:#818cf8}
.grad-expand-lbl:hover{color:#c084fc}
.ug-card,.grad-card{cursor:pointer}

/* Open Problem - simple & progress fields */
.op-simple{
  font-size:0.85rem;color:#fde68a;line-height:1.75;margin-bottom:0.7rem;
  padding:0.75rem 0.9rem;background:rgba(251,191,36,0.06);
  border-radius:7px;border-left:3px solid #f59e0b
}
.op-progress{
  font-size:0.82rem;color:#a7f3d0;line-height:1.7;margin-bottom:0.6rem;
  padding:0.65rem 0.8rem;background:rgba(16,185,129,0.05);
  border-radius:6px;border-left:3px solid rgba(16,185,129,0.5)
}
.op-lbl{font-family:'JetBrains Mono',monospace;font-size:0.62rem;text-transform:uppercase;letter-spacing:0.12em;margin-bottom:0.3rem;margin-top:0.6rem}

/* Research expanded card */
.res-detail{font-size:0.88rem;color:#7dd3fc;line-height:1.8;margin-top:0.6rem;padding-top:0.6rem;border-top:1px solid rgba(14,165,233,0.12);display:none}
.res-detail.show,.res-detail[style*="block"]{display:block}
.res-detail p{margin-bottom:0.6rem}
.res-detail p:last-child{margin-bottom:0}
.res-math{font-family:'JetBrains Mono',monospace;font-size:0.8rem;color:#38bdf8;background:rgba(14,165,233,0.08);padding:0.4rem 0.6rem;border-radius:5px;display:block;margin:0.4rem 0;white-space:pre-wrap;word-break:break-word}
/* REVEAL ANIMATION */
.reveal{opacity:0;transform:translateY(18px);transition:opacity 0.5s ease,transform 0.5s ease}
.reveal.visible{opacity:1;transform:translateY(0)}
@keyframes fadeUp{from{opacity:0;transform:translateY(22px)}to{opacity:1;transform:translateY(0)}}
.fade-in{animation:fadeUp 0.7s ease forwards}
/* RESPONSIVE */
@media(max-width:900px){.oly-phd{grid-template-columns:1fr}}
@media(max-width:768px){.intro-grid{grid-template-columns:1fr}.section{padding:4rem 1rem}.g2{grid-template-columns:1fr}.g3{grid-template-columns:1fr}}
@media(max-width:640px){.g4{grid-template-columns:1fr 1fr}.hero-eq{font-size:0.85rem}}

/* ── GRID ALIGNMENT — prevent blank card stretch ────────────── */
.g2,.g3,.g4{align-items:start}

/* ── DESKTOP EXPANDED GLOW — big screen, readable fonts ─────── */
@media(min-width:769px){
  /* ── Puzzle cards ──────────────────────────────────────── */
  .puz-card:has(.puz-body[style*="block"]){
    grid-column:1/-1;--gc:#06b6d4;--gs:rgba(6,182,212,.3);--gp:rgba(6,182,212,.16);
    border-color:#06b6d4!important;
    background:linear-gradient(140deg,rgba(6,182,212,.16),rgba(6,182,212,.06))!important;
    animation:glowPulse 2.6s ease-in-out infinite;
    transition:all .3s ease;padding:1.7rem!important;
  }
  .puz-card:has(.puz-body[style*="block"]) .puz-title{font-size:1.25rem!important;color:#22d3ee}
  .puz-card:has(.puz-body[style*="block"]) .puz-q{font-size:1.08rem;line-height:1.95}
  .puz-card:has(.puz-body[style*="block"]) .puz-hint,.puz-card:has(.puz-body[style*="block"]) .puz-ans{font-size:1.0rem;line-height:1.9}

  /* ── Undergrad cards ───────────────────────────────────── */
  .ug-card:has(.ug-detail:not([style*="none"])){
    grid-column:1/-1;--gc:#6366f1;--gs:rgba(99,102,241,.3);--gp:rgba(99,102,241,.16);
    border-color:rgba(99,102,241,.85)!important;
    background:linear-gradient(140deg,rgba(99,102,241,.2),rgba(99,102,241,.07))!important;
    animation:glowPulse 2.6s ease-in-out infinite;
    transition:all .3s ease;padding:1.7rem!important;
  }
  .ug-card:has(.ug-detail:not([style*="none"])) .ug-topic{font-size:1.22rem!important;color:#a5b4fc}
  .ug-card:has(.ug-detail:not([style*="none"])) .ug-detail{font-size:1.02rem;line-height:1.96}

  /* ── Graduate cards ────────────────────────────────────── */
  .grad-card:has(.grad-detail:not([style*="none"])){
    grid-column:1/-1;--gc:#a855f7;--gs:rgba(168,85,247,.3);--gp:rgba(168,85,247,.16);
    border-color:rgba(168,85,247,.85)!important;
    background:linear-gradient(140deg,rgba(168,85,247,.2),rgba(168,85,247,.07))!important;
    animation:glowPulse 2.6s ease-in-out infinite;
    transition:all .3s ease;padding:1.7rem!important;
  }
  .grad-card:has(.grad-detail:not([style*="none"])) .grad-topic{font-size:1.22rem!important;color:#e9d5ff}
  .grad-card:has(.grad-detail:not([style*="none"])) .grad-detail{font-size:1.02rem;line-height:1.96}

  /* ── Research cards ────────────────────────────────────── */
  .res-card:has(.res-detail.show){
    grid-column:1/-1;--gc:#0ea5e9;--gs:rgba(14,165,233,.3);--gp:rgba(14,165,233,.15);
    border-color:rgba(14,165,233,.85)!important;
    background:linear-gradient(140deg,rgba(14,165,233,.18),rgba(14,165,233,.06))!important;
    animation:glowPulse 2.6s ease-in-out infinite;
    transition:all .3s ease;padding:1.7rem!important;
  }
  .res-card:has(.res-detail.show) .res-title{font-size:1.25rem!important;color:#38bdf8}
  .res-detail.show{font-size:1.02rem!important;line-height:1.96;color:#bae6fd}
  .res-card:has(.res-detail.show) .res-desc{font-size:1.0rem}

  /* ── Open problems ─────────────────────────────────────── */
  .op-card:has(.op-body[style*="block"]){
    grid-column:1/-1;--gc:#ef4444;--gs:rgba(239,68,68,.28);--gp:rgba(239,68,68,.14);
    border-color:rgba(239,68,68,.8)!important;
    background:linear-gradient(140deg,rgba(239,68,68,.16),rgba(239,68,68,.05))!important;
    animation:glowPulse 2.6s ease-in-out infinite;
    transition:all .3s ease;padding:1.7rem!important;
  }
  .op-card:has(.op-body[style*="block"]) .op-title{font-size:1.2rem!important;color:#fca5a5}
  .op-card:has(.op-body[style*="block"]) .op-stmt{font-size:1.08rem!important}
  .op-card:has(.op-body[style*="block"]) .op-why,.op-card:has(.op-body[style*="block"]) .op-how{font-size:1.0rem;line-height:1.92}

  /* ── Career cards ──────────────────────────────────────── */
  .car-card:has(.car-section:not([style*="none"])){
    grid-column:1/-1;--gc:#8b5cf6;--gs:rgba(139,92,246,.3);--gp:rgba(139,92,246,.15);
    border-color:rgba(139,92,246,.85)!important;
    background:linear-gradient(140deg,rgba(139,92,246,.2),rgba(139,92,246,.07))!important;
    animation:glowPulse 2.6s ease-in-out infinite;
    transition:all .3s ease;padding:1.7rem!important;
  }
  .car-card:has(.car-section:not([style*="none"])) .car-title{font-size:1.18rem!important;color:#c4b5fd}
  .car-section-body{font-size:0.97rem;line-height:1.88}

  /* ── Olympiad problems ─────────────────────────────────── */
  .prob-card:has(.prob-body[style*="block"]){
    grid-column:1/-1;--gc:#f59e0b;--gs:rgba(245,158,11,.28);--gp:rgba(245,158,11,.14);
    border-color:rgba(245,158,11,.8)!important;
    background:linear-gradient(140deg,rgba(245,158,11,.14),rgba(245,158,11,.05))!important;
    animation:glowPulse 2.6s ease-in-out infinite;
    transition:all .3s ease;padding:1.7rem!important;
  }
  .prob-card:has(.prob-body[style*="block"]) .prob-ttl{font-size:1.15rem!important;color:#fcd34d}
  .prob-card:has(.prob-body[style*="block"]) .prob-stmt,.prob-card:has(.prob-body[style*="block"]) .prob-stmt-visible{font-size:1.08rem;line-height:1.92}
  .prob-card:has(.prob-body[style*="block"]) .prob-insight{font-size:1.0rem;line-height:1.9}
}

/* ═══ FONT UTILITIES ════════════════════════════════════════ */
.font-serif{font-family:'Playfair Display',Georgia,serif}

/* ═══ SPA PAGE SYSTEM ═══════════════════════════════════════ */
.page{display:none;min-height:calc(100vh - 52px)}
.page.active{display:block}


/* Nav uses buttons */
#nav button.nav-a{background:none;border:none;cursor:pointer;font-family:'Space Grotesk',sans-serif;line-height:1}

/* Extra top padding on each content page for the fixed nav */
.page>.section{padding-top:calc(88px + 2rem)}

/* Home page: hero handles its own top alignment */
#page-home{min-height:unset}

/* Breadcrumb strip at top of each content page */

/* Scroll-margin so sticky nav doesn't clip section headings */
section[id]{scroll-margin-top:88px}

/* Footer */
#footer{background:#000008;border-top:1px solid rgba(139,92,246,0.12);
        padding:3rem 1.5rem;text-align:center}
.foot-eq{font-family:'JetBrains Mono',monospace;font-size:1.4rem;
         color:#7c3aed;margin-bottom:0.9rem;letter-spacing:0.1em}
.foot-txt{font-size:0.83rem;color:#94a3b8;line-height:1.8}

/* ═══ LIGHT MODE ════════════════════════════════════════════════ */
/* old light-mode rules removed — see new block above */

/* Math display blocks */
.math-block{display:block;margin:0.5rem 0;padding:0.45rem 0.9rem;background:rgba(99,102,241,0.06);border-radius:6px;font-family:'JetBrains Mono',monospace;font-size:0.88rem;color:#c7d2fe;text-align:center;white-space:pre-wrap;word-break:break-word}
.frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;font-size:0.85em;line-height:1.15;margin:0 0.1em}
.frac sup{border-bottom:1px solid currentColor;padding:0 3px;font-size:1em;line-height:1.2;vertical-align:baseline}
.frac span{display:none}
.frac sub{padding:0 3px;font-size:1em;line-height:1.2;vertical-align:baseline}

/* Olympiad problem format fix */
.prob-stmt-visible{font-size:0.87rem;color:#fef3c7;line-height:1.72;padding:0.75rem 0.95rem;background:rgba(245,158,11,0.05);border-left:3px solid #f59e0b}
.prob-meta-row{display:flex;flex-direction:column;gap:0.4rem;padding:0.6rem 0.95rem;border-bottom:1px solid rgba(245,158,11,0.08)}
.prob-title-line{display:flex;align-items:flex-start;gap:0.55rem}
.prob-info-line{display:flex;align-items:center;justify-content:space-between;gap:0.5rem;flex-wrap:wrap}
.prob-toggle{padding:0.45rem 0.95rem;font-family:'JetBrains Mono',monospace;font-size:0.62rem;letter-spacing:0.1em;text-transform:uppercase;color:#f59e0b;cursor:pointer;display:inline-flex;align-items:center;gap:0.3rem}
.prob-toggle:hover{color:#fef08a}

/* Puzzle blur boxes */
.puz-blur-box{position:relative;border-radius:7px;overflow:hidden}
.puz-blur-label{font-family:'JetBrains Mono',monospace;font-size:0.68rem;letter-spacing:0.1em;text-transform:uppercase;color:#06b6d4;cursor:pointer;padding:0.35rem 0;margin-bottom:0.25rem;display:block;user-select:none}
.puz-blur-label:hover{color:#22d3ee}
.puz-blurred{filter:blur(7px);user-select:none;pointer-events:none;transition:filter 0.3s}
.puz-blurred.revealed{filter:none;pointer-events:auto}

/* Facts single column */
.facts-single-col{display:flex;flex-direction:column;gap:0.75rem}
.fact-card{cursor:pointer}
.fact-heading{font-family:'Playfair Display',serif;font-size:1.14rem;font-weight:700;color:#f1f5f9;line-height:1.35;margin-bottom:0.35rem}
.fact-tap-hint{font-family:'JetBrains Mono',monospace;font-size:0.65rem;letter-spacing:0.12em;text-transform:uppercase;color:var(--fa,#a855f7);opacity:0.6;margin-top:0.35rem}
.fact-body{margin-top:0.5rem;border-top:1px solid rgba(255,255,255,0.06);padding-top:0.5rem}

/* Research start guide */
.res-start-guide{margin-top:0.75rem;padding:0.75rem 0.9rem;background:rgba(16,185,129,0.07);border:1px solid rgba(16,185,129,0.18);border-radius:8px}
.res-start-lbl{font-family:'JetBrains Mono',monospace;font-size:0.67rem;text-transform:uppercase;letter-spacing:0.12em;color:#34d399;margin-bottom:0.5rem}
.res-start-item{font-size:0.84rem;color:#a7f3d0;margin-bottom:0.3rem;line-height:1.6}
.res-start-item a{color:#6ee7b7;text-decoration:underline;text-decoration-color:rgba(110,231,183,0.4)}
.res-start-item a:hover{color:#34d399}

/* Career expanded sections */
.car-section{margin-top:0.7rem;border-top:1px solid rgba(139,92,246,0.1);padding-top:0.7rem}
.car-section-lbl{font-family:'JetBrains Mono',monospace;font-size:0.65rem;text-transform:uppercase;letter-spacing:0.12em;color:#8b5cf6;margin-bottom:0.35rem}
.car-section-body{font-size:0.85rem;color:#dde6f0;line-height:1.68}
.car-section-body strong{color:#c4b5fd}
.car-expand-btn{font-family:'JetBrains Mono',monospace;font-size:0.67rem;letter-spacing:0.08em;text-transform:uppercase;color:#8b5cf6;cursor:pointer;margin-top:0.5rem;display:inline-flex;align-items:center;gap:0.25rem;border:none;background:none;padding:0}
.car-expand-btn:hover{color:#c4b5fd}

/* Quote of the day */
.quote-of-day{background:rgba(139,92,246,0.07);border:1px solid rgba(139,92,246,0.2);border-radius:12px;padding:1.5rem 1.75rem;margin-bottom:2.5rem;position:relative;overflow:hidden}
.quote-of-day::before{content:'"';position:absolute;top:-0.5rem;left:0.75rem;font-family:'Playfair Display',serif;font-size:6rem;color:rgba(139,92,246,0.12);line-height:1}
.quote-text{font-family:'Playfair Display',serif;font-style:italic;font-size:1.1rem;color:#ddd6fe;line-height:1.8;margin-bottom:0.65rem;position:relative;z-index:1}
.quote-attr{font-family:'JetBrains Mono',monospace;font-size:0.76rem;color:#8b5cf6;letter-spacing:0.08em;position:relative;z-index:1}

/* ══════════════════════════════════════════════════════════════
   FIX 5: SECTION-SPECIFIC FONTS
   ══════════════════════════════════════════════════════════════ */

/* BOOKS — Lora: warm, readable, literary */
#page-books .book-title { font-family: 'Lora', serif !important; }
#page-books .book-desc { font-family: 'Lora', serif; font-size: 0.94rem; }
#page-books .s-title { font-family: 'Lora', serif !important; }
#page-books .book-card { letter-spacing: 0.01em; }

/* PUZZLES — Nunito: friendly, rounded, approachable */
#page-puzzles .puz-title { font-family: 'Nunito', sans-serif !important; font-weight: 800; }
#page-puzzles .puz-q { font-family: 'Nunito', sans-serif; font-size: 1.0rem; }
#page-puzzles .s-title { font-family: 'Nunito', sans-serif !important; font-weight: 800; }
#page-puzzles .puz-hint, #page-puzzles .puz-ans { font-family: 'Nunito', sans-serif; }

/* OLYMPIAD — Oswald: condensed, athletic, competitive */
#page-olympiad .prob-ttl { font-family: 'Oswald', sans-serif !important; font-size: 1.05rem; letter-spacing: 0.03em; }
#page-olympiad .oly-tab { font-family: 'Oswald', sans-serif; letter-spacing: 0.04em; }
#page-olympiad .s-title { font-family: 'Oswald', sans-serif !important; letter-spacing: 0.05em; }
#page-olympiad .prob-stmt-visible { font-family: 'EB Garamond', serif; font-size: 1.04rem; }

/* UNDERGRAD & GRADUATE — EB Garamond: scholarly, academic, serious */
#page-undergrad .ug-topic { font-family: 'EB Garamond', serif !important; font-size: 1.18rem; }
#page-undergrad .ug-desc { font-family: 'EB Garamond', serif; font-size: 1.01rem; }
#page-undergrad .ug-detail { font-family: 'EB Garamond', serif; font-size: 1.05rem; line-height: 1.88; }
#page-undergrad .s-title { font-family: 'EB Garamond', serif !important; }
#page-graduate .grad-topic { font-family: 'EB Garamond', serif !important; font-size: 1.18rem; }
#page-graduate .grad-desc { font-family: 'EB Garamond', serif; font-size: 1.01rem; }
#page-graduate .grad-detail { font-family: 'EB Garamond', serif; font-size: 1.05rem; line-height: 1.88; }
#page-graduate .s-title { font-family: 'EB Garamond', serif !important; }

/* RESEARCH — IBM Plex Sans: technical, modern, precise */
#page-research .res-title { font-family: 'IBM Plex Sans', sans-serif !important; font-weight: 600; }
#page-research .res-desc { font-family: 'IBM Plex Sans', sans-serif; font-size: 0.95rem; }
#page-research .s-title { font-family: 'IBM Plex Sans', sans-serif !important; font-weight: 600; }
#page-research .res-start-item { font-family: 'IBM Plex Sans', sans-serif; }

/* OPEN PROBLEMS — Bebas Neue: dramatic, imposing, iconic */
#page-openproblems .op-title { font-family: 'Bebas Neue', sans-serif !important; font-size: 1.45rem; letter-spacing: 0.08em; }
#page-openproblems .s-title { font-family: 'Bebas Neue', sans-serif !important; letter-spacing: 0.1em; }

/* CAREERS — Lato: professional, clean, corporate */
#page-careers .car-title { font-family: 'Lato', sans-serif !important; font-weight: 700; font-size: 1.08rem; }
#page-careers .car-desc { font-family: 'Lato', sans-serif; }
#page-careers .s-title { font-family: 'Lato', sans-serif !important; font-weight: 700; }
#page-careers .car-section-body { font-family: 'Lato', sans-serif; font-size: 0.9rem; }

/* STUDY GUIDE — Cormorant Garamond: philosophical, contemplative, elegant */
#page-studyguide .s-title { font-family: 'Cormorant Garamond', serif !important; font-weight: 600; font-size: clamp(2.2rem,5vw,3.5rem); }
#page-studyguide .tip-title { font-family: 'Cormorant Garamond', serif !important; font-size: 1.25rem; }
#page-studyguide .tip-desc { font-family: 'Cormorant Garamond', serif; font-size: 1.08rem; line-height: 1.88; }
#page-studyguide .quote-text { font-family: 'Cormorant Garamond', serif !important; font-size: 1.28rem; }

/* MATH FACTS — Abril Fatface for headings: bold, display, unforgettable */
#page-facts .fact-heading { font-family: 'Abril Fatface', serif !important; font-size: 1.18rem; font-weight: 400; line-height: 1.25; }
#page-facts .s-title { font-family: 'Abril Fatface', serif !important; font-weight: 400; letter-spacing: 0.02em; }
#page-facts .fact-cat { font-family: 'Oswald', sans-serif; letter-spacing: 0.1em; }

/* PRE-COLLEGE — Nunito: friendly, accessible, encouraging */
#page-precollege .pc-topic { font-family: 'Nunito', sans-serif !important; font-weight: 800; }
#page-precollege .s-title { font-family: 'Nunito', sans-serif !important; font-weight: 800; }

/* ══════════════════════════════════════════════════════════════
   FIX 2: Font size scale-up
   ══════════════════════════════════════════════════════════════ */
.book-desc { font-size: 0.94rem; }
.book-title { font-size: 1.07rem !important; }
.puz-title { font-size: 1.04rem !important; }
.puz-q { font-size: 0.98rem; line-height: 1.82; }
.ug-topic { font-size: 1.1rem !important; }
.ug-desc { font-size: 0.96rem; }
.grad-topic { font-size: 1.1rem !important; }
.prob-stmt-visible { font-size: 1.0rem; }
.fact-heading { font-size: 1.16rem; }
.fact-text { font-size: 0.96rem; line-height: 1.82; }
.tip-title { font-size: 1.04rem !important; }
.tip-desc { font-size: 0.97rem; }
.car-desc { font-size: 0.96rem; }
.res-desc { font-size: 0.95rem; }
.op-desc { font-size: 0.95rem; }

/* ══════════════════════════════════════════════════════════════
   FIX 3: BRIGHT TEXT — upgrade all muted text
   ══════════════════════════════════════════════════════════════ */
.book-desc { color: #dde6f0 !important; }
.book-author { color: #fcd34d !important; }
.ug-desc { color: #dde6f0 !important; }
.grad-desc { color: #dde6f0 !important; }
.res-desc { color: #e2e8f0 !important; }
.car-desc { color: #dde6f0 !important; }
.op-desc { color: #dde6f0 !important; }
.tip-desc { color: #dde6f0 !important; }
.myth-truth { color: #dde6f0 !important; }
.fact-text { color: #e8eef6 !important; }
.puz-q { color: #e0f2fe !important; }
.pc-desc { color: #dde6f0 !important; }

/* ══════════════════════════════════════════════════════════════
   FIX 6: MORE VIBRANT — gradient cards, stronger glows, richer backgrounds
   ══════════════════════════════════════════════════════════════ */

/* Vibrant section title colors */
#page-olympiad .s-title { color: #fde68a !important; }
#page-undergrad .s-title { color: #c7d2fe !important; }
#page-graduate .s-title { color: #e9d5ff !important; }
#page-research .s-title { color: #bae6fd !important; }
#page-openproblems .s-title { color: #fca5a5 !important; }
#page-careers .s-title { color: #d8b4fe !important; }
#page-studyguide .s-title { color: #a7f3d0 !important; }
#page-facts .s-title { color: #fef08a !important; }
#page-books .s-title { color: #fde68a !important; }
#page-puzzles .s-title { color: #a5f3fc !important; }

/* Stronger card backgrounds and borders */
.ug-card { background: rgba(99,102,241,0.1) !important; border-color: rgba(99,102,241,0.28) !important; }
.ug-card:hover { background: rgba(99,102,241,0.18) !important; border-color: rgba(99,102,241,0.5) !important; box-shadow: 0 12px 40px rgba(99,102,241,0.2) !important; }

.grad-card { background: rgba(168,85,247,0.1) !important; border-color: rgba(168,85,247,0.28) !important; }
.grad-card:hover { background: rgba(168,85,247,0.18) !important; border-color: rgba(168,85,247,0.5) !important; box-shadow: 0 12px 40px rgba(168,85,247,0.22) !important; }

.res-card { background: rgba(14,165,233,0.1) !important; border-color: rgba(14,165,233,0.28) !important; }
.res-card:hover { background: rgba(14,165,233,0.18) !important; border-color: rgba(14,165,233,0.5) !important; box-shadow: 0 12px 40px rgba(14,165,233,0.2) !important; }

.op-card { background: rgba(239,68,68,0.1) !important; border-color: rgba(239,68,68,0.28) !important; }
.op-card:hover { background: rgba(239,68,68,0.18) !important; border-color: rgba(239,68,68,0.5) !important; box-shadow: 0 12px 40px rgba(239,68,68,0.2) !important; }

.car-card { background: rgba(139,92,246,0.1) !important; border-color: rgba(139,92,246,0.28) !important; }
.car-card:hover { background: rgba(139,92,246,0.18) !important; border-color: rgba(139,92,246,0.5) !important; box-shadow: 0 12px 40px rgba(139,92,246,0.22) !important; }

.tip-card { background: rgba(16,185,129,0.1) !important; border-color: rgba(16,185,129,0.28) !important; }
.tip-card:hover { background: rgba(16,185,129,0.18) !important; border-color: rgba(16,185,129,0.5) !important; box-shadow: 0 12px 40px rgba(16,185,129,0.2) !important; }

.puz-card { background: rgba(6,182,212,0.1) !important; border-color: rgba(6,182,212,0.28) !important; }
.puz-card:hover { background: rgba(6,182,212,0.18) !important; border-color: rgba(6,182,212,0.5) !important; box-shadow: 0 12px 40px rgba(6,182,212,0.2) !important; }

.prob-card { background: rgba(245,158,11,0.09) !important; border-color: rgba(245,158,11,0.28) !important; }
.prob-card:hover { border-color: rgba(245,158,11,0.5) !important; box-shadow: 0 8px 28px rgba(245,158,11,0.15) !important; }

/* Fact cards — more colorful */
.fact-card { border-width: 1.5px !important; }
.facts-single-col { display: flex !important; flex-direction: column !important; gap: 0.85rem !important; }

/* Stronger topic colors */
.ug-topic { color: #a5b4fc !important; }
.grad-topic { color: #d8b4fe !important; }
.res-title { color: #7dd3fc !important; }
.op-title { color: #fca5a5 !important; }
.car-title { color: #c4b5fd !important; }
.tip-title { color: #6ee7b7 !important; }
.puz-title { color: #a5f3fc !important; }

/* Make numbers and special text pop more */
.car-sal { color: #86efac !important; font-weight: 600; }
.car-icon { font-size: 2.2rem !important; }
.res-who { color: #93c5fd !important; }
.res-inst { color: #a5b4fc !important; }
.prob-num { color: #fcd34d !important; font-weight: 700; }
.stars { color: #fbbf24 !important; }

/* ══════════════════════════════════════════════════════════════
   FIX 4: REDESIGNED LIGHT MODE — warm academic aesthetic
   ══════════════════════════════════════════════════════════════ */
body.light-mode {
  background: #faf7f2 !important;
  color: #1c1410 !important;
}

/* Light mode — Section backgrounds */
body.light-mode .page { background: #faf7f2 !important; }
body.light-mode #books { background: #fdf6e9 !important; }
body.light-mode #puzzles { background: #edf7fc !important; }
body.light-mode #olympiad { background: #fdf9ee !important; }
body.light-mode #undergrad { background: #f3f0ff !important; }
body.light-mode #graduate { background: #f8f0ff !important; }
body.light-mode #research { background: #e8f4fd !important; }
body.light-mode #openproblems { background: #fff1f0 !important; }
body.light-mode #careers { background: #f5f0ff !important; }
body.light-mode #studyguide { background: #f0faf6 !important; }
body.light-mode #facts { background: #fffbeb !important; }
body.light-mode #precollege { background: #f0f7ff !important; }

/* Light mode — Nav */
body.light-mode #nav {
  background: rgba(250,247,242,0.97) !important;
  border-bottom: 2px solid rgba(124,58,237,0.2) !important;
  backdrop-filter: blur(20px) !important;
}
body.light-mode .nav-brand {
  background: linear-gradient(90deg,#7c3aed,#0ea5e9) !important;
  -webkit-background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
}
body.light-mode .nav-a { color: #44403c !important; font-weight: 500 !important; }
body.light-mode .nav-a.active {
  color: #5b21b6 !important;
  background: rgba(124,58,237,0.12) !important;
  font-weight: 700 !important;
}
body.light-mode .nav-a:hover { color: #1c1410 !important; background: rgba(124,58,237,0.08) !important; }

/* Light mode — Section headings */
body.light-mode .s-title { color: #1c1410 !important; -webkit-text-fill-color: #1c1410 !important; }
body.light-mode .s-desc { color: #44403c !important; }
body.light-mode #page-olympiad .s-title { color: #78350f !important; -webkit-text-fill-color: #78350f !important; }
body.light-mode #page-undergrad .s-title { color: #312e81 !important; -webkit-text-fill-color: #312e81 !important; }
body.light-mode #page-graduate .s-title { color: #4c1d95 !important; -webkit-text-fill-color: #4c1d95 !important; }
body.light-mode #page-research .s-title { color: #0c4a6e !important; -webkit-text-fill-color: #0c4a6e !important; }
body.light-mode #page-openproblems .s-title { color: #7f1d1d !important; -webkit-text-fill-color: #7f1d1d !important; }
body.light-mode #page-careers .s-title { color: #3b0764 !important; -webkit-text-fill-color: #3b0764 !important; }
body.light-mode #page-studyguide .s-title { color: #064e3b !important; -webkit-text-fill-color: #064e3b !important; }
body.light-mode #page-facts .s-title { color: #78350f !important; -webkit-text-fill-color: #78350f !important; }
body.light-mode #page-books .s-title { color: #78350f !important; -webkit-text-fill-color: #78350f !important; }
body.light-mode #page-puzzles .s-title { color: #164e63 !important; -webkit-text-fill-color: #164e63 !important; }

/* Light mode — Book cards */
body.light-mode .book-card {
  background: linear-gradient(135deg,#fffcf5,#fef6e4) !important;
  border: 1.5px solid rgba(180,83,9,0.25) !important;
  box-shadow: 0 2px 12px rgba(180,83,9,0.08) !important;
}
body.light-mode .book-title { color: #1c1410 !important; }
body.light-mode .book-desc { color: #44403c !important; }
body.light-mode .book-author { color: #92400e !important; }

/* Light mode — Puzzle cards */
body.light-mode .puz-card {
  background: linear-gradient(135deg,#f0fbff,#e0f7fc) !important;
  border: 1.5px solid rgba(8,145,178,0.3) !important;
  box-shadow: 0 2px 12px rgba(8,145,178,0.1) !important;
}
body.light-mode .puz-title { color: #0e7490 !important; }
body.light-mode .puz-q { color: #0c4a6e !important; background: rgba(6,182,212,0.08) !important; }

/* Light mode — Undergrad cards */
body.light-mode .ug-card {
  background: linear-gradient(135deg,#f5f3ff,#ede9fe) !important;
  border: 1.5px solid rgba(109,40,217,0.25) !important;
  box-shadow: 0 2px 12px rgba(109,40,217,0.07) !important;
}
body.light-mode .ug-topic { color: #3730a3 !important; }
body.light-mode .ug-desc { color: #312e81 !important; }

/* Light mode — Graduate cards */
body.light-mode .grad-card {
  background: linear-gradient(135deg,#fdf4ff,#f3e8ff) !important;
  border: 1.5px solid rgba(126,34,206,0.25) !important;
  box-shadow: 0 2px 12px rgba(126,34,206,0.07) !important;
}
body.light-mode .grad-topic { color: #6b21a8 !important; }
body.light-mode .grad-desc { color: #4c1d95 !important; }

/* Light mode — Research cards */
body.light-mode .res-card {
  background: linear-gradient(135deg,#f0f9ff,#e0f2fe) !important;
  border: 1.5px solid rgba(2,132,199,0.25) !important;
  box-shadow: 0 2px 12px rgba(2,132,199,0.08) !important;
}
body.light-mode .res-title { color: #0c4a6e !important; }
body.light-mode .res-desc { color: #075985 !important; }
body.light-mode .res-who, body.light-mode .res-inst { color: #0369a1 !important; }

/* Light mode — Open Problems */
body.light-mode .op-card {
  background: linear-gradient(135deg,#fff7f7,#fee2e2) !important;
  border: 1.5px solid rgba(185,28,28,0.2) !important;
  box-shadow: 0 2px 12px rgba(185,28,28,0.07) !important;
}
body.light-mode .op-title { color: #991b1b !important; }
body.light-mode .op-desc { color: #7f1d1d !important; }

/* Light mode — Careers */
body.light-mode .car-card {
  background: linear-gradient(135deg,#faf5ff,#f3e8ff) !important;
  border: 1.5px solid rgba(109,40,217,0.22) !important;
  box-shadow: 0 2px 12px rgba(109,40,217,0.07) !important;
}
body.light-mode .car-title { color: #3b0764 !important; }
body.light-mode .car-desc { color: #4c1d95 !important; }
body.light-mode .car-sal { color: #14532d !important; }

/* Light mode — Study Guide */
body.light-mode .tip-card {
  background: linear-gradient(135deg,#f0fdf9,#d1fae5) !important;
  border: 1.5px solid rgba(4,120,87,0.25) !important;
  box-shadow: 0 2px 12px rgba(4,120,87,0.07) !important;
}
body.light-mode .tip-title { color: #064e3b !important; }
body.light-mode .tip-desc { color: #065f46 !important; }

/* Light mode — Math Facts */
body.light-mode .fact-card {
  background: linear-gradient(135deg,#fffbeb,#fef3c7) !important;
  border-color: rgba(180,83,9,0.3) !important;
  box-shadow: 0 2px 12px rgba(180,83,9,0.08) !important;
}
body.light-mode .fact-heading { color: #1c1410 !important; }
body.light-mode .fact-text { color: #44403c !important; }
body.light-mode .fact-cat { opacity: 0.9; }

/* Light mode — Olympiad */
body.light-mode .oly-tab {
  color: #92400e !important;
  background: rgba(245,158,11,0.08) !important;
  border-color: rgba(245,158,11,0.2) !important;
}
body.light-mode .oly-tab.active {
  color: #78350f !important;
  background: rgba(245,158,11,0.2) !important;
  border-color: #f59e0b !important;
}
body.light-mode .prob-card {
  background: linear-gradient(135deg,#fffbeb,#fef9ee) !important;
  border-color: rgba(180,83,9,0.25) !important;
}
body.light-mode .prob-ttl { color: #1c1410 !important; }
body.light-mode .prob-stmt-visible { color: #44403c !important; background: rgba(245,158,11,0.06) !important; border-left-color: #d97706 !important; }

/* Light mode — Quote box */
body.light-mode .quote-of-day {
  background: linear-gradient(135deg,#f0fdf9,#d1fae5) !important;
  border-color: rgba(4,120,87,0.3) !important;
}
body.light-mode .quote-text { color: #064e3b !important; }
body.light-mode .quote-attr { color: #047857 !important; }
body.light-mode .quote-of-day::before { color: rgba(4,120,87,0.15) !important; }

/* Light mode — Math blocks */
body.light-mode .math-block { background: #f0f4ff !important; color: #1e1b4b !important; }

/* Light mode — Auth bar */
body.light-mode #auth-topbar {
  background: #f0ebe1 !important;
  border-bottom: 1px solid rgba(124,58,237,0.15) !important;
}

/* Light mode — Scrollbar */
body.light-mode ::-webkit-scrollbar-track { background: #f0ebe1 !important; }
body.light-mode ::-webkit-scrollbar-thumb { background: #9333ea !important; }

/* Light mode — UG/Grad detail text */
body.light-mode .ug-detail { color: #312e81 !important; border-color: rgba(99,102,241,0.15) !important; }
body.light-mode .grad-detail { color: #4c1d95 !important; }

/* Light mode — Home intro */
body.light-mode #intro { background: linear-gradient(160deg,#faf7f2,#f5f0ff,#e8f4fd) !important; }
body.light-mode .intro-prose p { color: #1c1410 !important; }
body.light-mode .myth-card { background: rgba(124,58,237,0.07) !important; border-color: rgba(124,58,237,0.2) !important; }
body.light-mode .myth-truth { color: #44403c !important; }

/* Light mode — Research start guides */
body.light-mode .res-start-guide {
  background: rgba(4,120,87,0.08) !important;
  border-color: rgba(4,120,87,0.25) !important;
}
body.light-mode .res-start-item { color: #065f46 !important; }
body.light-mode .res-start-item a { color: #047857 !important; }

/* Light mode — Career sections */
body.light-mode .car-section-body { color: #44403c !important; }
body.light-mode .car-section-body strong { color: #3b0764 !important; }

/* Light mode — Prob insight */
body.light-mode .prob-insight { color: #44403c !important; }
body.light-mode .ins-lbl { color: #047857 !important; }

/* Light mode — University cards */
body.light-mode .uni-card { background: linear-gradient(135deg,#fff7ed,#ffedd5) !important; border-color: rgba(194,65,12,0.2) !important; }

/* Theme toggle light mode */
body.light-mode #theme-toggle {
  background: rgba(255,251,235,0.95) !important;
  color: #6d28d9 !important;
  border-color: rgba(109,40,217,0.35) !important;
  box-shadow: 0 2px 12px rgba(109,40,217,0.15) !important;
}
body.light-mode #btt {
  background: rgba(255,251,235,0.9) !important;
  color: #5b21b6 !important;
  border-color: rgba(109,40,217,0.25) !important;
}

/* Fix: light mode fact cards — use accent color for tinted background */
body.light-mode .fact-card {
  background: color-mix(in srgb, white 82%, var(--fa, #f59e0b) 18%) !important;
  border: 2px solid var(--fa, #f59e0b) !important;
  box-shadow: 0 2px 16px color-mix(in srgb, transparent 80%, var(--fa, #f59e0b) 20%) !important;
}
body.light-mode .fact-cat {
  color: var(--fa, #b45309) !important;
  font-weight: 700 !important;
}
body.light-mode .fact-tap-hint {
  color: var(--fa, #b45309) !important;
}

/* Light mode: auth topbar improved */
body.light-mode #auth-topbar {
  background: linear-gradient(90deg,#fdf8f0,#f5f0ff) !important;
}

/* Light mode: carousel/hero background for home */
body.light-mode #hero {
  background: linear-gradient(160deg,#1a0a2e 0%,#0f172a 60%,#0c1445 100%) !important;
}
body.light-mode #hero .hero-title,
body.light-mode #hero .hero-sub,
body.light-mode #hero .hero-eq { color: inherit; }

/* Light mode: Olympiad oly-phd description box */
body.light-mode .oly-phd { background: rgba(245,158,11,0.06) !important; }
body.light-mode .oly-desc { color: #44403c !important; }
body.light-mode .oly-bk-t { color: #1c1410 !important; }
body.light-mode .oly-bk-a { color: #92400e !important; }
body.light-mode .oly-bk-n { color: #78350f !important; }
body.light-mode .prob-meta-row { border-bottom-color: rgba(180,83,9,0.12) !important; }
body.light-mode .prob-num { color: #92400e !important; }
body.light-mode .prob-ttl { color: #1c1410 !important; }
body.light-mode .prob-dif { color: #d97706 !important; }
body.light-mode .prob-src-lbl { color: #78350f !important; }
body.light-mode .prob-toggle { color: #d97706 !important; }
body.light-mode .prob-insight { background: rgba(245,158,11,0.05) !important; color: #44403c !important; }
body.light-mode .ins-lbl { color: #047857 !important; }

/* Light mode: footer */
body.light-mode footer { background: #f0ebe1 !important; }
body.light-mode .foot-txt { color: #44403c !important; }


body.light-mode .puz-hint { color: #0c4a6e !important; }
body.light-mode .puz-ans { color: #065f46 !important; background: rgba(16,185,129,0.08) !important; }

/* Light mode: atb buttons */
body.light-mode .atb-home { background: rgba(124,58,237,0.08) !important; color: #3b0764 !important; border-color: rgba(124,58,237,0.2) !important; }
body.light-mode .atb-signin { background: linear-gradient(135deg,#5b21b6,#0ea5e9) !important; color: white !important; }

/* Light mode: pre-college cards */
body.light-mode .pc-card {
  background: linear-gradient(135deg,#eff6ff,#dbeafe) !important;
  border-color: rgba(37,99,235,0.25) !important;
}
body.light-mode .pc-topic { color: #1e40af !important; }
body.light-mode .pc-desc { color: #1e3a8a !important; }

/* Light mode: university cards */
body.light-mode .uni-card {
  background: linear-gradient(135deg,#fff7ed,#ffedd5) !important;
  border-color: rgba(194,65,12,0.25) !important;
}
body.light-mode .uni-name { color: #7c2d12 !important; }
body.light-mode .uni-note { color: #9a3412 !important; }

/* Light mode: research start guide */
body.light-mode .res-start-guide {
  background: linear-gradient(135deg,#f0fdf9,#d1fae5) !important;
  border-color: rgba(4,120,87,0.3) !important;
}
body.light-mode .res-start-lbl { color: #064e3b !important; }
body.light-mode .res-start-item { color: #065f46 !important; }
body.light-mode .res-start-item a { color: #047857 !important; }

/* Light mode: career expand button */
body.light-mode .car-expand-btn { color: #5b21b6 !important; }
body.light-mode .car-section-lbl { color: #5b21b6 !important; }
body.light-mode .car-section-body { color: #3b0764 !important; }
body.light-mode .car-section-body strong { color: #2e1065 !important; }
body.light-mode .car-tag { background: rgba(109,40,217,0.1) !important; color: #5b21b6 !important; border-color: rgba(109,40,217,0.2) !important; }

/* Light mode: daily quote */
body.light-mode .quote-of-day {
  background: linear-gradient(135deg,#f0fdf9,#ecfdf5) !important;
  border: 1.5px solid rgba(4,120,87,0.3) !important;
}
body.light-mode .quote-text { color: #064e3b !important; font-style: italic; }
body.light-mode .quote-attr { color: #059669 !important; }
body.light-mode .quote-of-day::before { color: rgba(4,120,87,0.12) !important; }

/* Light mode: math-block */
body.light-mode .math-block {
  background: linear-gradient(135deg,#f0f4ff,#e0e7ff) !important;
  color: #1e1b4b !important;
  border: 1px solid rgba(79,70,229,0.15) !important;
}

/* Light mode: res-detail + ug-detail */
body.light-mode .res-detail { color: #0c4a6e !important; }
body.light-mode .ug-detail { background: rgba(99,102,241,0.04) !important; border-color: rgba(99,102,241,0.15) !important; color: #312e81 !important; }
body.light-mode .ug-detail em { color: #3730a3 !important; }
body.light-mode .ug-expand-lbl { color: #4338ca !important; }
body.light-mode .grad-detail { background: rgba(168,85,247,0.04) !important; border-color: rgba(168,85,247,0.15) !important; color: #4c1d95 !important; }

/* ── Dark mode further brightness boost ─────────────────────── */
/* Make dark mode feel electric, not just dark-grey */
.book-title { color: #fef3c7 !important; }
.book-cat-badge { font-weight: 700; }
.ug-topic { color: #c7d2fe !important; font-weight: 600; }
.grad-topic { color: #e9d5ff !important; font-weight: 600; }
.res-title { color: #bae6fd !important; font-weight: 600; }
.op-title { color: #fca5a5 !important; font-weight: 600; }
.car-title { color: #ddd6fe !important; font-weight: 700; }
.tip-title { color: #6ee7b7 !important; font-weight: 600; }
.prob-ttl { color: #fef3c7 !important; }
.puz-title { color: #cffafe !important; font-weight: 700; }

/* Brighter hero equation glow */
.hero-eq { color: #e9d5ff !important; text-shadow: 0 0 30px rgba(167,139,250,0.5) !important; }

/* Brighter section subtitles */
.s-desc { color: #dde6f0 !important; }

/* ═══ INDIA BUY LINKS ═══════════════════════════════════════ */
.buy-links { display:flex; flex-wrap:wrap; gap:0.3rem; margin-top:0.5rem; }
.buy-link {
  font-size:0.62rem; font-family:'Space Grotesk',sans-serif; font-weight:600;
  padding:0.15rem 0.5rem; border-radius:99px; text-decoration:none;
  transition:all 0.2s; border:1px solid; display:inline-flex; align-items:center; gap:0.25rem;
}
.buy-link.amz  { background:rgba(255,153,0,0.12); color:#ff9900; border-color:rgba(255,153,0,0.3); }
.buy-link.amz:hover  { background:rgba(255,153,0,0.25); border-color:#ff9900; }
body.light-mode .buy-link.amz  { color:#b36b00 !important; background:rgba(255,153,0,0.1) !important; }

/* ═══ ADMIN CONTROLS ════════════════════════════════════════ */
.admin-bar {
  display:none; align-items:center; gap:0.5rem; margin-top:0.75rem;
  padding-top:0.65rem; border-top:1px dashed rgba(139,92,246,0.3);
}
.admin-bar.visible { display:flex; flex-wrap:wrap; }
.admin-btn {
  font-family:'Space Grotesk',sans-serif; font-size:0.62rem; font-weight:600;
  padding:0.22rem 0.6rem; border-radius:99px; cursor:pointer; border:none;
  transition:all 0.2s; display:inline-flex; align-items:center; gap:0.25rem;
}
.admin-btn.add-btn { background:rgba(16,185,129,0.15); color:#34d399; border:1px solid rgba(16,185,129,0.35); }
.admin-btn.add-btn:hover { background:rgba(16,185,129,0.3); }
.admin-btn.edit-btn { background:rgba(99,102,241,0.15); color:#a5b4fc; border:1px solid rgba(99,102,241,0.35); }
.admin-btn.edit-btn:hover { background:rgba(99,102,241,0.3); }
.admin-btn.del-btn  { background:rgba(239,68,68,0.15); color:#fca5a5; border:1px solid rgba(239,68,68,0.35); }
.admin-btn.del-btn:hover  { background:rgba(239,68,68,0.3); }

/* ═══ ADMIN MODAL ═══════════════════════════════════════════ */
#adminModal {
  display:none; position:fixed; inset:0; z-index:9999; background:rgba(0,0,0,0.75);
  backdrop-filter:blur(6px); align-items:center; justify-content:center; padding:1rem;
}
#adminModal.open { display:flex; }
.admin-modal-box {
  background:#0d0020; border:1px solid rgba(139,92,246,0.35); border-radius:16px;
  padding:1.75rem; width:100%; max-width:640px; max-height:90vh; overflow-y:auto;
  box-shadow:0 24px 80px rgba(0,0,0,0.6);
}
.admin-modal-title {
  font-family:'Playfair Display',serif; font-size:1.2rem; color:#e9d5ff;
  margin-bottom:1.25rem; padding-bottom:0.75rem; border-bottom:1px solid rgba(139,92,246,0.2);
}
.admin-field { margin-bottom:0.9rem; }
.admin-field label {
  display:block; font-family:'JetBrains Mono',monospace; font-size:0.63rem;
  letter-spacing:0.12em; text-transform:uppercase; color:#a855f7; margin-bottom:0.3rem;
}
.admin-field input, .admin-field textarea, .admin-field select {
  width:100%; background:rgba(139,92,246,0.08); border:1px solid rgba(139,92,246,0.3);
  border-radius:8px; color:#e2e8f0; font-family:'Inter',sans-serif; font-size:0.85rem;
  padding:0.6rem 0.8rem; outline:none; resize:vertical; transition:border-color 0.2s;
}
.admin-field input:focus, .admin-field textarea:focus {
  border-color:#7c3aed; box-shadow:0 0 0 2px rgba(124,58,237,0.15);
}
.admin-field textarea { min-height:90px; }
.admin-modal-actions { display:flex; gap:0.6rem; justify-content:flex-end; margin-top:1.2rem; }
.admin-save-btn {
  font-family:'Space Grotesk',sans-serif; font-size:0.82rem; font-weight:600;
  padding:0.55rem 1.4rem; border-radius:99px; border:none; cursor:pointer;
  background:linear-gradient(135deg,#7c3aed,#1d4ed8); color:#fff;
  transition:all 0.2s; box-shadow:0 4px 16px rgba(124,58,237,0.3);
}
.admin-save-btn:hover { transform:translateY(-1px); box-shadow:0 8px 24px rgba(124,58,237,0.4); }
.admin-cancel-btn {
  font-family:'Space Grotesk',sans-serif; font-size:0.82rem; font-weight:500;
  padding:0.55rem 1.2rem; border-radius:99px; border:1px solid rgba(100,116,139,0.3);
  background:none; color:#94a3b8; cursor:pointer; transition:all 0.2s;
}
.admin-cancel-btn:hover { border-color:rgba(239,68,68,0.4); color:#fca5a5; }
.admin-latex-hint {
  font-size:0.68rem; color:#6366f1; margin-top:0.25rem; font-family:'JetBrains Mono',monospace;
}
.admin-latex-preview {
  margin-top:0.5rem; padding:0.5rem 0.75rem; background:rgba(99,102,241,0.06);
  border-radius:6px; border:1px solid rgba(99,102,241,0.15); min-height:2rem;
  font-size:0.88rem; color:#c7d2fe;
}

/* PDF upload in admin */
.admin-pdf-list { margin-top:0.5rem; }
.admin-pdf-item {
  display:flex; align-items:center; gap:0.5rem; padding:0.4rem 0.6rem;
  background:rgba(14,165,233,0.07); border-radius:6px; margin-bottom:0.35rem;
  font-size:0.75rem; color:#7dd3fc;
}
.admin-pdf-item a { color:#38bdf8; text-decoration:underline; text-underline-offset:3px; }
.admin-pdf-item .remove-pdf { 
  margin-left:auto; background:none; border:none; color:#fca5a5;
  cursor:pointer; font-size:0.75rem; padding:0.1rem 0.3rem; border-radius:4px;
}
.admin-pdf-item .remove-pdf:hover { background:rgba(239,68,68,0.12); }

/* PDF viewer links on cards */
.pdf-resource-link {
  display:inline-flex; align-items:center; gap:0.35rem;
  font-size:0.72rem; color:#7dd3fc; text-decoration:none;
  background:rgba(14,165,233,0.08); border:1px solid rgba(14,165,233,0.22);
  padding:0.2rem 0.6rem; border-radius:99px; margin-top:0.4rem;
  transition:all 0.2s; font-family:'Space Grotesk',sans-serif;
}
.pdf-resource-link:hover { background:rgba(14,165,233,0.18); border-color:rgba(14,165,233,0.5); }

/* ═══ COMPREHENSIVE LIGHT MODE FIX ════════════════════════════ */
/* Every text-bearing element must be dark in light mode */
body.light-mode { color: #1c1410 !important; }
body.light-mode h1, body.light-mode h2, body.light-mode h3,
body.light-mode h4, body.light-mode h5, body.light-mode h6 { color: #1c1410 !important; }

/* NAV */
body.light-mode #nav { background: rgba(250,247,242,0.97) !important; }
body.light-mode .nav-brand { background: linear-gradient(90deg,#7c3aed,#0ea5e9) !important; -webkit-background-clip:text !important; -webkit-text-fill-color:transparent !important; }
body.light-mode .nav-a { color: #44403c !important; }
body.light-mode .nav-a.active { color: #5b21b6 !important; background: rgba(124,58,237,0.12) !important; }

/* AUTH BAR */
body.light-mode #auth-topbar { background: linear-gradient(90deg,#fdf8f0,#f5f0ff) !important; border-bottom:1px solid rgba(124,58,237,0.15) !important; }
body.light-mode .atb-home { color: #3b0764 !important; background: rgba(124,58,237,0.08) !important; border-color: rgba(124,58,237,0.2) !important; }
body.light-mode .atb-signin { color: white !important; }
body.light-mode .atb-username { color: #064e3b !important; background: rgba(4,120,87,0.1) !important; border-color: rgba(4,120,87,0.25) !important; }
body.light-mode .atb-signout { color: #44403c !important; }

/* HERO (keep dark) */
body.light-mode #hero { background: linear-gradient(160deg,#1a0a2e 0%,#0f172a 60%,#0c1445 100%) !important; }

/* SECTION TITLES & DESCRIPTIONS */
body.light-mode .s-desc { color: #44403c !important; }
body.light-mode #intro .s-title { color: #1c1410 !important; -webkit-text-fill-color: #1c1410 !important; }
body.light-mode #intro { background: linear-gradient(160deg,#faf7f2,#f5f0ff,#e8f4fd) !important; }
body.light-mode .intro-prose p { color: #1c1410 !important; }
body.light-mode .myth-card { background: rgba(124,58,237,0.07) !important; border-color: rgba(124,58,237,0.2) !important; }
body.light-mode .myth-truth { color: #1c1410 !important; }
body.light-mode .myth-label { color: #7c3aed !important; }

/* BOOKS */
body.light-mode #books { background: #fdf6e9 !important; }
body.light-mode .book-card { background: linear-gradient(135deg,#fffcf5,#fef6e4) !important; border:1.5px solid rgba(180,83,9,0.25) !important; box-shadow:0 2px 12px rgba(180,83,9,0.08) !important; }
body.light-mode .book-title { color: #1c1410 !important; }
body.light-mode .book-desc { color: #44403c !important; }
body.light-mode .book-author { color: #92400e !important; }
body.light-mode .book-year { color: #78350f !important; }
body.light-mode .book-cat { color: #92400e !important; background: rgba(217,119,6,0.1) !important; }

/* PUZZLES */
body.light-mode #puzzles { background: #edf7fc !important; }
body.light-mode .puz-card { background: linear-gradient(135deg,#f0fbff,#e0f7fc) !important; border:1.5px solid rgba(8,145,178,0.3) !important; }
body.light-mode .puz-title { color: #0e7490 !important; }
body.light-mode .puz-q { color: #0c4a6e !important; background: rgba(6,182,212,0.08) !important; }
body.light-mode .puz-hint { color: #0c4a6e !important; }
body.light-mode .puz-ans { color: #065f46 !important; background: rgba(16,185,129,0.08) !important; }
body.light-mode .puz-blur-label { color: #0e7490 !important; }
body.light-mode .puz-meta .puz-src { color: #0e7490 !important; background: rgba(6,182,212,0.08) !important; }
body.light-mode .puz-diff { color: #0e7490 !important; }

/* PRE-COLLEGE */
body.light-mode #precollege { background: #f0f7ff !important; }
body.light-mode .pc-card { background: linear-gradient(135deg,#eff6ff,#dbeafe) !important; border-color:rgba(37,99,235,0.25) !important; }
body.light-mode .pc-topic { color: #1e40af !important; }
body.light-mode .pc-sub { color: #1e3a8a !important; }
body.light-mode .pc-grade { color: #1d4ed8 !important; background: rgba(59,130,246,0.1) !important; }
body.light-mode .pc-book { color: #1e40af !important; }
body.light-mode .pc-book span { color: #44403c !important; }

/* OLYMPIAD */
body.light-mode #olympiad { background: #fdf9ee !important; }
body.light-mode .oly-tab { color: #92400e !important; background: rgba(245,158,11,0.08) !important; border-color:rgba(245,158,11,0.2) !important; }
body.light-mode .oly-tab.active { color: #78350f !important; background: rgba(245,158,11,0.2) !important; border-color:#f59e0b !important; }
body.light-mode .oly-desc { color: #1c1410 !important; }
body.light-mode .oly-bk-box { background: rgba(245,158,11,0.06) !important; border-color:rgba(245,158,11,0.18) !important; }
body.light-mode .oly-bk-lbl { color: #92400e !important; }
body.light-mode .oly-bk-t { color: #1c1410 !important; }
body.light-mode .oly-bk-a { color: #92400e !important; }
body.light-mode .oly-bk-n { color: #78350f !important; }
body.light-mode .prob-card { background: linear-gradient(135deg,#fffbeb,#fef9ee) !important; border-color:rgba(180,83,9,0.25) !important; }
body.light-mode .prob-ttl { color: #1c1410 !important; }
body.light-mode .prob-stmt-visible { color: #44403c !important; background: rgba(245,158,11,0.06) !important; border-left-color:#d97706 !important; }
body.light-mode .prob-num { color: #92400e !important; }
body.light-mode .prob-dif { color: #d97706 !important; }
body.light-mode .prob-src-lbl { color: #78350f !important; }
body.light-mode .prob-toggle { color: #d97706 !important; }
body.light-mode .prob-insight { color: #1c1410 !important; background: rgba(245,158,11,0.05) !important; }
body.light-mode .ins-lbl { color: #047857 !important; }

/* UNDERGRAD */
body.light-mode #undergrad { background: #f3f0ff !important; }
body.light-mode .ug-card { background: linear-gradient(135deg,#f5f3ff,#ede9fe) !important; border:1.5px solid rgba(109,40,217,0.25) !important; }
body.light-mode .ug-tag { color: #5b21b6 !important; background: rgba(99,102,241,0.1) !important; }
body.light-mode .ug-topic { color: #3730a3 !important; }
body.light-mode .ug-desc { color: #312e81 !important; }
body.light-mode .ug-book { color: #3730a3 !important; }
body.light-mode .ug-book b { color: #1e1b4b !important; }
body.light-mode .ug-book i { color: #4338ca !important; }
body.light-mode .ug-detail { color: #312e81 !important; border-color:rgba(99,102,241,0.15) !important; }
body.light-mode .ug-detail em { color: #3730a3 !important; }
body.light-mode .ug-expand-lbl { color: #4338ca !important; }

/* GRADUATE */
body.light-mode #graduate { background: #f8f0ff !important; }
body.light-mode .grad-card { background: linear-gradient(135deg,#fdf4ff,#f3e8ff) !important; border:1.5px solid rgba(126,34,206,0.25) !important; }
body.light-mode .grad-topic { color: #6b21a8 !important; }
body.light-mode .grad-desc { color: #4c1d95 !important; }
body.light-mode .grad-book { color: #6b21a8 !important; }
body.light-mode .grad-book b { color: #3b0764 !important; }
body.light-mode .grad-detail { color: #4c1d95 !important; }
body.light-mode .grad-expand-lbl { color: #7c3aed !important; }

/* RESEARCH */
body.light-mode #research { background: #e8f4fd !important; }
body.light-mode .res-card { background: linear-gradient(135deg,#f0f9ff,#e0f2fe) !important; border:1.5px solid rgba(2,132,199,0.25) !important; }
body.light-mode .res-title { color: #0c4a6e !important; }
body.light-mode .res-desc { color: #075985 !important; }
body.light-mode .res-who { color: #0369a1 !important; }
body.light-mode .res-inst { color: #0369a1 !important; }
body.light-mode .res-detail { color: #0c4a6e !important; }
body.light-mode .res-start-guide { background: rgba(4,120,87,0.08) !important; border-color:rgba(4,120,87,0.25) !important; }
body.light-mode .res-start-lbl { color: #064e3b !important; }
body.light-mode .res-start-item { color: #065f46 !important; }
body.light-mode .res-start-item a { color: #047857 !important; }
body.light-mode .res-math { color: #0c4a6e !important; background: rgba(14,165,233,0.08) !important; }

/* OPEN PROBLEMS */
body.light-mode #openproblems { background: #fff1f0 !important; }
body.light-mode .op-card { background: linear-gradient(135deg,#fff7f7,#fee2e2) !important; border:1.5px solid rgba(185,28,28,0.2) !important; }
body.light-mode .op-title { color: #991b1b !important; }
body.light-mode .op-field { color: #7f1d1d !important; }
body.light-mode .op-stmt { color: #44403c !important; background: rgba(245,158,11,0.06) !important; }
body.light-mode .op-simple { color: #44403c !important; background: rgba(245,158,11,0.06) !important; }
body.light-mode .op-why { color: #1c1410 !important; }
body.light-mode .op-how { color: #1c1410 !important; background: rgba(16,185,129,0.06) !important; }
body.light-mode .op-progress { color: #1c1410 !important; background: rgba(16,185,129,0.05) !important; }
body.light-mode .op-lbl { color: #047857 !important; }

/* CAREERS */
body.light-mode #careers { background: #f5f0ff !important; }
body.light-mode .car-card { background: linear-gradient(135deg,#faf5ff,#f3e8ff) !important; border:1.5px solid rgba(109,40,217,0.22) !important; }
body.light-mode .car-title { color: #3b0764 !important; }
body.light-mode .car-desc { color: #4c1d95 !important; }
body.light-mode .car-sal { color: #14532d !important; }
body.light-mode .car-tag { background: rgba(109,40,217,0.1) !important; color: #5b21b6 !important; }
body.light-mode .car-section-lbl { color: #5b21b6 !important; }
body.light-mode .car-section-body { color: #3b0764 !important; }
body.light-mode .car-section-body strong { color: #2e1065 !important; }
body.light-mode .car-expand-btn { color: #5b21b6 !important; }

/* STUDY GUIDE */
body.light-mode #studyguide { background: #f0faf6 !important; }
body.light-mode .tip-card { background: linear-gradient(135deg,#f0fdf9,#d1fae5) !important; border:1.5px solid rgba(4,120,87,0.25) !important; }
body.light-mode .tip-title { color: #064e3b !important; }
body.light-mode .tip-desc { color: #065f46 !important; }
body.light-mode .quote-of-day { background: linear-gradient(135deg,#f0fdf9,#ecfdf5) !important; border:1.5px solid rgba(4,120,87,0.3) !important; }
body.light-mode .quote-text { color: #064e3b !important; }
body.light-mode .quote-attr { color: #059669 !important; }
body.light-mode .tip-num { color: #065f46 !important; background: rgba(4,120,87,0.1) !important; }

/* MATH FACTS */
body.light-mode #facts { background: #fffbeb !important; }
body.light-mode .fact-card {
  background: color-mix(in srgb, white 82%, var(--fa, #f59e0b) 18%) !important;
  border:2px solid var(--fa, #f59e0b) !important;
}
body.light-mode .fact-heading { color: #1c1410 !important; }
body.light-mode .fact-text { color: #44403c !important; }
body.light-mode .fact-cat { color: var(--fa, #b45309) !important; font-weight:700 !important; }
body.light-mode .fact-tap-hint { color: var(--fa, #b45309) !important; }
body.light-mode .fact-math { color: var(--fa, #b45309) !important; }

/* UNIVERSITIES */
body.light-mode #universities { background: #fff7ed !important; }
body.light-mode .uni-card { background: linear-gradient(135deg,#fff7ed,#ffedd5) !important; border-color:rgba(194,65,12,0.25) !important; }
body.light-mode .uni-name { color: #7c2d12 !important; }
body.light-mode .uni-city { color: #9a3412 !important; }
body.light-mode .uni-prog { color: #44403c !important; }
body.light-mode .uni-note { color: #9a3412 !important; }

/* FOOTER */
body.light-mode #footer { background: #f0ebe1 !important; }
body.light-mode .foot-txt { color: #44403c !important; }
body.light-mode .foot-eq { color: #7c3aed !important; }

/* BUTTONS / MISC */
body.light-mode 
body.light-mode 
body.light-mode #theme-toggle { background:rgba(255,251,235,0.95) !important; color:#6d28d9 !important; border-color:rgba(109,40,217,0.35) !important; }
body.light-mode #btt { background:rgba(255,251,235,0.9) !important; color:#5b21b6 !important; border-color:rgba(109,40,217,0.25) !important; }
body.light-mode .math-block { background:linear-gradient(135deg,#f0f4ff,#e0e7ff) !important; color:#1e1b4b !important; border:1px solid rgba(79,70,229,0.15) !important; }

/* ADMIN MODAL light mode */
body.light-mode .admin-modal-box { background:#fdf8ff; border-color:rgba(124,58,237,0.3); }
body.light-mode .admin-modal-title { color:#3b0764; }
body.light-mode .admin-field label { color:#7c3aed; }
body.light-mode .admin-field input, body.light-mode .admin-field textarea, body.light-mode .admin-field select {
  background:rgba(124,58,237,0.05); border-color:rgba(124,58,237,0.25); color:#1c1410;
}
body.light-mode .admin-latex-preview { background:rgba(99,102,241,0.06); color:#312e81; }
body.light-mode .admin-btn.edit-btn { color:#3730a3; background:rgba(99,102,241,0.1); }
body.light-mode .admin-btn.del-btn { color:#991b1b; background:rgba(239,68,68,0.08); }
body.light-mode .admin-btn.add-btn { color:#064e3b; background:rgba(16,185,129,0.1); }

/* HOME PAGE GRID BUTTONS */
body.light-mode #intro button[onclick] { background:rgba(255,255,255,0.8) !important; }
/* ═══ OLYMPIAD SOLUTION BLUR ═══════════════════════════════ */
.oly-sol-blurred { filter: blur(6px); user-select: none; pointer-events: none; transition: filter 0.3s; }
.oly-sol-reveal-btn {
  font-family:'JetBrains Mono',monospace; font-size:0.65rem; letter-spacing:0.1em;
  text-transform:uppercase; color:#f59e0b; cursor:pointer;
  padding:0.3rem 0.7rem; border:1px solid rgba(245,158,11,0.3);
  background:rgba(245,158,11,0.07); border-radius:99px; margin-bottom:0.5rem;
  display:inline-block; transition:all 0.2s;
}
.oly-sol-reveal-btn:hover { background:rgba(245,158,11,0.18); border-color:#f59e0b; }

/* ═══ BOOK READ STATE ════════════════════════════════════════ */
.book-card.book-read {
  background: linear-gradient(135deg,#064e3b,#065f46) !important;
  border-color: #10b981 !important;
  box-shadow: 0 0 0 2px #10b981, 0 8px 24px rgba(16,185,129,0.3) !important;
}
.book-card.book-read .book-title{color:#a7f3d0!important}
.book-card.book-read .book-author{color:#6ee7b7!important}
.book-card.book-read .book-desc{color:#d1fae5!important}
.book-card.book-read .book-year{color:#34d399!important}
.book-card.book-read .book-cat{background:rgba(16,185,129,0.25)!important;color:#a7f3d0!important;border-color:rgba(16,185,129,0.45)!important}

/* ═══ BOOK FILTER BAR ════════════════════════════════════════ */
.book-filter-bar{display:flex;gap:0.45rem;flex-wrap:wrap;justify-content:center;margin-bottom:1.75rem}
.book-filter-btn{font-family:'Space Grotesk',sans-serif;font-size:0.78rem;font-weight:600;padding:0.38rem 0.95rem;border-radius:99px;border:1px solid rgba(217,119,6,0.22);background:rgba(217,119,6,0.07);color:#b45309;cursor:pointer;transition:all 0.2s}
.book-filter-btn:hover{background:rgba(217,119,6,0.16);border-color:rgba(217,119,6,0.42);color:#fcd34d}
.book-filter-btn.active{background:rgba(217,119,6,0.22);border-color:#f59e0b;color:#fef08a;box-shadow:0 0 14px rgba(245,158,11,0.22)}
body.light-mode .book-filter-btn{color:#78350f;border-color:rgba(180,83,9,0.25);background:rgba(217,119,6,0.06)}
body.light-mode .book-filter-btn:hover{background:rgba(217,119,6,0.14);color:#78350f}
body.light-mode .book-filter-btn.active{background:rgba(217,119,6,0.18);color:#78350f;border-color:#d97706}

/* ═══ COMMENTS SECTION ═══════════════════════════════════════ */
#page-comments { background:#050014; }
.comment-box { background:rgba(139,92,246,0.06); border:1px solid rgba(139,92,246,0.2); border-radius:12px; padding:1rem; margin-bottom:0.9rem; }
.comment-user { font-family:'Space Grotesk',sans-serif; font-weight:600; font-size:0.82rem; color:#c4b5fd; margin-bottom:0.3rem; }
.comment-text { font-size:0.87rem; color:#dde6f0; line-height:1.7; }
.comment-time { font-size:0.67rem; color:#6366f1; font-family:'JetBrains Mono',monospace; margin-top:0.35rem; }
.comment-input-area { background:rgba(139,92,246,0.06); border:1px solid rgba(139,92,246,0.25); border-radius:12px; padding:1.25rem; margin-bottom:1.5rem; }
.comment-textarea { width:100%; background:rgba(139,92,246,0.08); border:1px solid rgba(139,92,246,0.25); border-radius:8px; color:#e2e8f0; font-family:'Inter',sans-serif; font-size:0.88rem; padding:0.7rem 0.9rem; outline:none; resize:vertical; min-height:80px; transition:border-color 0.2s; }
.comment-textarea:focus { border-color:#7c3aed; }
.comment-submit-btn { font-family:'Space Grotesk',sans-serif; font-size:0.82rem; font-weight:600; padding:0.55rem 1.4rem; border-radius:99px; border:none; cursor:pointer; background:linear-gradient(135deg,#7c3aed,#1d4ed8); color:#fff; margin-top:0.6rem; transition:all 0.2s; }
.comment-submit-btn:hover { transform:translateY(-1px); box-shadow:0 6px 20px rgba(124,58,237,0.4); }
.comment-del-btn { font-size:0.67rem; color:#fca5a5; background:none; border:none; cursor:pointer; margin-left:0.5rem; padding:0.1rem 0.3rem; border-radius:4px; }
.comment-del-btn:hover { background:rgba(239,68,68,0.1); }

/* ── COMMENTS: light-mode overrides ─────────────────────────── */
body.light-mode #page-comments { background:#f5f3ff !important; }
body.light-mode .comment-box { background:rgba(139,92,246,0.06); border-color:rgba(109,40,217,0.2); }
body.light-mode .comment-user { color:#5b21b6; }
body.light-mode .comment-text { color:#1e1b4b; }
body.light-mode .comment-time { color:#6d28d9; }
body.light-mode .comment-input-area { background:rgba(139,92,246,0.05); border-color:rgba(109,40,217,0.2); }
body.light-mode .comment-textarea { background:#fff; border-color:rgba(109,40,217,0.25); color:#1e1b4b; }
/* shared.js-generated comment DOM classes */
body.light-mode .comment-item { background:rgba(139,92,246,0.06); border:1px solid rgba(109,40,217,0.18); border-radius:10px; padding:0.8rem 1rem; margin-bottom:0.75rem; }
body.light-mode .comment-name { color:#5b21b6; }
body.light-mode .comment-date { color:#7c3aed; }
body.light-mode .comment-delete-btn { color:#b91c1c; }

/* ═══ OLYMPIAD IMPORTANCE BOX ═══════════════════════════════ */
.oly-importance-box {
  background: linear-gradient(135deg, rgba(245,158,11,0.08), rgba(251,191,36,0.04));
  border: 1px solid rgba(245,158,11,0.22);
  border-left: 4px solid #f59e0b;
  border-radius: 12px;
  padding: 1.5rem 1.75rem;
  margin-bottom: 2rem;
}
.oly-importance-title {
  font-family:'Oswald',sans-serif;
  font-size:1.1rem; font-weight:600; color:#fcd34d;
  letter-spacing:0.05em; margin-bottom:1rem;
  text-transform:uppercase;
}
.oly-importance-text {
  font-size:0.9rem; color:#fef3c7; line-height:1.85;
  margin-bottom:0.65rem;
}
.oly-importance-text:last-child { margin-bottom:0; }
body.light-mode .oly-importance-box { background:rgba(245,158,11,0.07)!important; border-color:rgba(180,83,9,0.3)!important; }
body.light-mode .oly-importance-title { color:#78350f!important; }
body.light-mode .oly-importance-text { color:#44403c!important; }

/* ═══ OP-PRIZE LIGHT MODE FIX ════════════════════════════════ */
body.light-mode .op-prize { background:rgba(161,98,7,0.15)!important; color:#92400e!important; border:1px solid rgba(161,98,7,0.35)!important; }

/* ═══ GRADUATE SECTION HEADING FIX ════════════════════════════ */

#page-graduate 
body.light-mode #page-graduate 
body.light-mode #page-graduate .s-eyebrow { color:#4c1d95!important; background:rgba(168,85,247,0.1)!important; }

/* ═══ OLYMPIAD EYEBROW LIGHT MODE FIX ════════════════════════ */
body.light-mode #page-olympiad .s-eyebrow { color:#78350f!important; background:rgba(245,158,11,0.12)!important; }
body.light-mode #page-olympiad 

/* ═══ NUMBERED PUZZLE/PROBLEM BADGES ════════════════════════ */
.puz-num-badge {
  font-family:'JetBrains Mono',monospace; font-size:0.62rem; color:#06b6d4;
  background:rgba(6,182,212,0.1); padding:0.1rem 0.38rem;
  border-radius:4px; display:inline-block; margin-right:0.4rem; flex-shrink:0;
}
.op-num-badge {
  font-family:'JetBrains Mono',monospace; font-size:0.62rem; color:#ef4444;
  background:rgba(239,68,68,0.1); padding:0.1rem 0.38rem;
  border-radius:4px; flex-shrink:0;
}
/* ═══ OPEN PROBLEMS CATEGORY DIVIDERS ════════════════════════ */
.op-cat-section { margin-bottom:2rem; }
.op-cat-label {
  font-family:'Bebas Neue',sans-serif; font-size:1.4rem; letter-spacing:0.1em;
  color:#fca5a5; margin-bottom:1rem; padding-bottom:0.5rem;
  border-bottom:2px solid rgba(239,68,68,0.25);
}
body.light-mode .op-cat-label { color:#991b1b!important; }

/* ═══ RESEARCH ACCESS INFO ════════════════════════════════════ */
.res-access {
  font-size:0.75rem; color:#6ee7b7; margin-top:0.6rem;
  background:rgba(16,185,129,0.06); border:1px solid rgba(16,185,129,0.15);
  border-radius:7px; padding:0.5rem 0.75rem; line-height:1.65;
}
.res-access a { color:#34d399; text-decoration:underline; text-decoration-color:rgba(52,211,153,0.4); }
body.light-mode .res-access { background:rgba(4,120,87,0.06)!important; color:#065f46!important; }

/* ═══ ABOUT / CONTACT FOOTER LINKS ════════════════════════════ */
.foot-links { display:flex; justify-content:center; gap:1.2rem; margin-top:1.2rem; flex-wrap:wrap; }
.foot-link {
  font-family:'Space Grotesk',sans-serif; font-size:0.75rem; font-weight:500;
  color:#8b5cf6; text-decoration:none; padding:0.28rem 0.75rem;
  border:1px solid rgba(139,92,246,0.25); border-radius:99px;
  transition:all 0.2s; display:inline-flex; align-items:center; gap:0.3rem;
  background:none; cursor:pointer;
}
.foot-link:hover { color:#c4b5fd; border-color:rgba(139,92,246,0.5); background:rgba(139,92,246,0.1); }
body.light-mode .foot-link { color:#5b21b6!important; border-color:rgba(109,40,217,0.3)!important; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  canvas { display: none; }
}