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10px;font-weight:550}.card p{color:var(--muted);line-height:1.6;font-size:14px}.card-top{display:flex;justify-content:space-between;align-items:center;gap:10px;color:#82b6ff;font-size:12px}.pill{display:inline-flex;padding:6px 9px;border-radius:999px;border:1px solid rgba(122,184,255,.16);background:rgba(47,123,255,.08);color:#a8ceff;font-size:11px}.metric{font-size:52px;font-weight:400;letter-spacing:-.06em;margin-bottom:8px}.muted{color:var(--muted)}.blue{color:#78adff}.list{list-style:none;margin:16px 0 0;padding:0;display:grid;gap:9px;color:#b8c2d0;font-size:13px}.list li{display:flex;gap:9px;align-items:flex-start}.list li:before{content:"";width:5px;height:5px;border-radius:50%;background:#2f7bff;margin-top:6px;flex:none}.page-hero{padding:clamp(72px,8vw,96px) 0 56px;position:relative;overflow:hidden}.page-hero:after{content:"";position:absolute;width:500px;height:500px;right:-100px;top:-260px;border:1px solid rgba(0,194,255,.25);border-radius:50%;box-shadow:0 0 120px rgba(47,123,255,.18)}.page-hero h1{margin:20px 0}.toolbar{display:flex;gap:12px;align-items:center;justify-content:space-between;margin-bottom:28px;flex-wrap:wrap}.search{flex:1;min-width:260px;max-width:430px;height:46px;border-radius:999px;padding:0 18px;border:1px solid rgba(255,255,255,.1);background:#090f1b;color:white;outline:none}.search:focus{border-color:#2f7bff;box-shadow:0 0 0 3px rgba(47,123,255,.12)}.filters{display:flex;gap:8px;flex-wrap:wrap}.filter{border:1px solid rgba(255,255,255,.1);color:#b2bfd0;background:transparent;border-radius:999px;padding:9px 13px;cursor:pointer;font-size:12px;white-space:nowrap;transition:transform .18s ease,border-color .18s ease,background .18s ease,color .18s ease}.filter.active{color:white;background:#163568;border-color:#2f7bff}.timeline{display:grid;gap:14px}.timeline-card{display:grid;grid-template-columns:80px 1fr 240px;gap:24px;padding:26px;align-items:start}.level-num{width:55px;height:55px;border-radius:17px;display:grid;place-items:center;background:linear-gradient(135deg,#2f7bff,#00a8ee);font-size:19px}.timeline-card h3{margin:0 0 8px;font-size:24px}.timeline-card p{margin:0;color:var(--muted);line-height:1.55}.timeline-meta{display:grid;gap:10px;font-size:12px;color:#aab6c6}.prose{max-width:820px}.prose h2{font-size:30px;margin:56px 0 18px}.prose h3{font-size:20px;margin:32px 0 12px}.prose p{color:#c1ccda;line-height:1.7;font-size:16px;max-width:72ch}.callout{padding:22px;border-left:2px solid #2f7bff;background:rgba(47,123,255,.07);border-radius:0 16px 16px 0;color:#d7e7ff;line-height:1.7}.lesson-row{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:18px 0;border-bottom:1px solid rgba(255,255,255,.08)}.lesson-row:last-child{border:0}.copybox{margin-top:18px;padding:16px;border:1px dashed rgba(122,184,255,.35);background:#080e18;border-radius:14px;color:#c8d5e5;font-family:var(--font-geist-mono),ui-monospace,monospace;font-size:12px;line-height:1.65}.footer{position:relative;overflow:hidden;padding:72px 0 36px;background:linear-gradient(180deg,#02040a,#060c18);border-top:1px solid rgba(255,255,255,.05)}.footer:before{content:"";position:absolute;left:-10%;right:-10%;top:18px;height:70px;border-top:1px solid rgba(47,123,255,.2);border-radius:50%;box-shadow:0 -22px 80px rgba(47,123,255,.16);pointer-events:none}.footer-shell{position:relative;z-index:1}.footer-grid{display:grid;grid-template-columns:1.6fr repeat(4,1fr);gap:32px}.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;font-weight:700;font-size:15px}.footer-logo{width:44px;height:44px;-o-object-fit:contain;object-fit:contain;display:block;flex:none}.footer-desc{color:#687892;line-height:1.75;max-width:380px;font-size:14px}.footer-col h3{margin:0 0 14px;font-size:13px;color:#dbeafe}.footer-links{display:grid;gap:10px;font-size:13px}.footer-links a{color:#7a8a9e;transition:color .2s ease,text-decoration-color .2s ease;padding:4px 0;display:inline-flex;align-items:center;text-decoration:underline;text-decoration-color:transparent;text-underline-offset:4px}.footer-links a:hover{color:#b9d8ff;text-decoration-color:rgba(185,216,255,.55)}.footer-bottom{margin-top:50px;padding-top:24px;border-top:1px solid rgba(255,255,255,.06);color:#4a5568;font-size:12px;justify-content:space-between}.footer-bottom,.footer-credit{display:flex;align-items:center}.footer-credit{gap:18px}.footer-credit a{color:#8291a8;text-decoration:underline;text-decoration-color:transparent;text-underline-offset:4px;transition:color .2s ease,text-decoration-color .2s ease}.footer-credit a:hover{color:#b9d8ff;text-decoration-color:rgba(185,216,255,.55)}.quiz-option{width:100%;text-align:left;margin:7px 0;padding:14px;border-radius:13px;border:1px solid rgba(255,255,255,.1);background:#0b111c;color:#c6d0dd;cursor:pointer}.quiz-option.selected,.quiz-option:hover{border-color:#2f7bff;background:rgba(47,123,255,.1);color:white}.steps{list-style:none;padding:0;margin:24px 0 0;display:grid;gap:15px}.steps li{display:grid;grid-template-columns:30px 1fr;gap:12px;align-items:start}.steps li>span{width:30px;height:30px;display:grid;place-items:center;border-radius:10px;color:#b9d8ff;background:rgba(47,123,255,.13);border:1px solid rgba(122,184,255,.18);font-size:12px}.steps p{margin:5px 0 0;color:#c2cbd7;line-height:1.5;font-size:14px}.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:var(--detail-gap);align-items:start}.sticky-card{position:sticky;top:100px}.progress{height:5px;border-radius:999px;background:#172033;overflow:hidden}.progress span{display:block;height:100%;background:linear-gradient(90deg,#2f7bff,#00c2ff)}.concept-accordion{display:grid;gap:12px}.concept-accordion details{border:1px solid rgba(255,255,255,.09);border-radius:14px;background:linear-gradient(145deg,rgba(16,27,48,.84),rgba(7,12,22,.7));overflow:hidden}.concept-accordion summary{cursor:pointer;padding:18px 20px;display:flex;justify-content:space-between;gap:16px;align-items:center;color:#edf5ff}.concept-accordion summary::-webkit-details-marker{display:none}.concept-accordion summary span:first-child{color:#82b6ff;font-size:12px;letter-spacing:.1em}.concept-body{padding:0 20px 20px;display:grid;gap:14px}.concept-body p{margin:0}.concept-body strong{color:#e9f3ff}.workflow-visual{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px;margin:18px 0 26px}.workflow-node{min-height:72px;padding:12px;border-radius:14px;border:1px solid rgba(122,184,255,.18);background:rgba(47,123,255,.08);display:grid;align-content:center;gap:4px}.workflow-node span{color:#82b6ff;font-size:11px;letter-spacing:.08em}.workflow-node strong{font-size:13px}.resource-card-tool{border-top:2px solid rgba(0,194,255,.55)}.resource-card-prompt{border-top:2px solid rgba(74,222,128,.5)}.resource-card-workflow{border-top:2px solid rgba(251,191,36,.55)}.resource-card-use-case{border-top:2px solid rgba(244,114,182,.5)}.resource-card-project{border-top:2px solid rgba(167,139,250,.55)}.resource-card-module{border-top:2px solid rgba(96,165,250,.55)}.learning-progression{max-width:760px}.progression-grid{display:grid;grid-template-columns:220px 1fr;gap:28px;align-items:center}.progression-steps{display:grid;gap:12px;position:relative}.progression-step{display:grid;grid-template-columns:42px 1fr;gap:12px;align-items:center;padding:10px 0}.progression-step span{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;color:#b9d8ff;background:rgba(47,123,255,.12);border:1px solid rgba(122,184,255,.18);font-family:var(--font-geist-mono),ui-monospace,monospace;font-size:12px}.skill-check-entry{scroll-margin-top:88px}.skill-check-entry-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,390px);gap:clamp(36px,7vw,86px);align-items:center}.skill-check-entry-copy h2{margin:24px 0 18px;font-size:clamp(38px,5.4vw,68px);line-height:1.02;letter-spacing:-.055em;font-weight:500}.skill-check-entry-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:28px}.skill-check-entry-actions>span{color:#738197;font-size:12px}.skill-card-preview{position:relative;display:block;max-width:360px;justify-self:end;overflow:hidden;border-radius:16px;border:1px solid rgba(122,184,255,.2);background:#07101f;box-shadow:0 28px 70px rgba(0,0,0,.38),0 0 36px rgba(47,123,255,.12);transform:rotate(2deg);transition:transform .28s ease,border-color .28s ease}.skill-card-preview:hover{transform:rotate(0deg) translateY(-4px);border-color:rgba(122,184,255,.42)}.skill-card-preview img{width:100%;aspect-ratio:4/5;-o-object-fit:cover;object-fit:cover;-o-object-position:center top;object-position:center top;display:block}.skill-card-preview:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 62%,rgba(3,6,13,.86));pointer-events:none}.skill-card-preview-caption{position:absolute;z-index:1;left:18px;right:18px;bottom:16px;display:flex;align-items:center;gap:8px;color:#dcebff;font-size:12px}.skill-check-shell{padding:36px}.skill-card-stage{margin:28px 0;display:flex;justify-content:center}.skill-card-render,.skill-result-card{width:min(540px,100%)}.skill-result-card{position:relative;overflow:hidden;border-radius:20px;background:#080c18}.skill-result-art{width:100%;display:block}.skill-result-brand,.skill-result-user{position:absolute;top:18px;z-index:2;display:flex;align-items:center;gap:8px;min-height:38px;padding:5px 11px 5px 5px;border:1px solid rgba(96,165,250,.3);border-radius:20px;background:rgba(3,8,20,.74);backdrop-filter:blur(8px);color:#e7f2ff;font-size:12px;font-weight:650}.skill-result-brand{left:18px}.skill-result-user{right:18px}.skill-result-avatar,.skill-result-logo{width:28px;height:28px;overflow:hidden;border-radius:8px;background:white;display:grid;place-items:center;flex:none}.skill-result-avatar img,.skill-result-logo img{width:100%;height:100%;-o-object-fit:cover;object-fit:cover;display:block}.skill-result-avatar{border-radius:50%;background:#17243b;color:#8ebcff}.skill-result-footer{position:absolute;z-index:2;left:18px;right:18px;bottom:14px;min-height:38px;padding:9px 12px;display:flex;align-items:center;justify-content:space-between;gap:12px;border:1px solid rgba(96,165,250,.22);border-radius:12px;background:rgba(3,8,20,.84);color:#aebed3;font-size:10px;backdrop-filter:blur(8px)}.skill-result-footer strong{color:white;font-size:12px}.skill-username-prompt{margin-bottom:28px;padding:20px;border-radius:12px;background:rgba(59,130,246,.05);border:1px solid rgba(59,130,246,.15);color:#60a5fa;font-size:13px;font-weight:600}.skill-username-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}.skill-username-field{flex:1 1 220px;position:relative}.skill-username-field span{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:#64748b;font-size:14px}.skill-username-field input{width:100%;padding:10px 14px 10px 28px;border-radius:10px;border:1px solid rgba(117,170,255,.2);background:rgba(117,170,255,.05);color:#e2e8f0;font-size:14px;outline:none}.skill-next-actions,.skill-share-actions{display:flex;gap:10px;flex-wrap:wrap}.skill-next-actions{margin-top:16px}.skill-share-message{min-height:20px;margin:10px 0 0;font-size:13px}.hero-bg{position:absolute;inset:-4%;z-index:0;overflow:hidden;background:radial-gradient(ellipse at 50% 42%,rgba(47,123,255,.28),transparent 40%),radial-gradient(circle at 72% 28%,rgba(0,194,255,.12),transparent 27%),#03060d}.hero-bg:before{content:"";position:absolute;width:165%;height:310px;left:-32.5%;top:29%;background:repeating-linear-gradient(100deg,transparent 0 22px,rgba(0,194,255,.28) 24px,rgba(47,123,255,.12) 26px,transparent 31px);transform:translateZ(0) rotate(-6deg) scale(1.08);transform-origin:center;filter:blur(1.4px) drop-shadow(0 0 26px rgba(47,123,255,.28));opacity:.8;animation:wave-slide 18s ease-in-out infinite alternate}.hero-bg:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(3,6,13,.34),rgba(3,6,13,.08) 40%,#03060d 98%)}@keyframes wave-slide{0%{transform:translate3d(-70px,8px,0) rotate(-6deg) scale(1.08)}to{transform:translate3d(70px,-8px,0) rotate(-6deg) scale(1.12)}}@media (max-width:900px){.nav-links,.nav-links-more{display:none}.menu-toggle{display:flex}.mobile-menu{display:none}.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}.timeline-card{grid-template-columns:65px 1fr}.timeline-meta{grid-column:2}.stat-float{display:none}.hero{min-height:650px}.hero-content{padding:100px 0 60px}.ribbon{width:800px}.detail-layout,.footer-grid{grid-template-columns:1fr}.detail-layout{gap:28px}.sticky-card{position:static}.mobile-stats{display:flex!important;flex-wrap:wrap;gap:10px;margin-top:28px;justify-content:center}.workflow-visual{grid-template-columns:repeat(3,minmax(0,1fr))}.progression-grid,.skill-check-entry-grid{grid-template-columns:1fr}.skill-card-preview{justify-self:start;max-width:330px;transform:none}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}.ribbon{filter:none}.hero-bg:before,.ribbon{animation:none!important}.hero-bg:before{transform:rotate(-6deg) scale(1.08)!important}}@media (max-width:620px){.container{width:min(100% - 28px,1180px)}.brand-logo-frame{width:35px;height:35px;border-radius:9px}.launch-btn{display:none}.hero h1{font-size:48px}.hero-copy{font-size:16px}.hero-actions .btn{flex:1 1 160px}.hero-bg{inset:0;background:radial-gradient(ellipse at 50% 38%,rgba(47,123,255,.2),transparent 46%),#03060d}.hero-bg:before{width:190%;left:-45%;height:220px;top:32%;opacity:.46;animation-duration:28s;filter:blur(1.8px) drop-shadow(0 0 18px rgba(47,123,255,.2))}.hero:before{opacity:.07}.section{padding:var(--section-y-mobile) 0}.section-head{gap:8px}.grid-2,.grid-3,.grid-4,.section-head{grid-template-columns:1fr}.timeline-card{grid-template-columns:52px 1fr;padding:18px;gap:14px}.level-num{width:46px;height:46px}.footer-links{grid-template-columns:repeat(2,1fr)}.footer-bottom{align-items:flex-start;gap:18px;flex-direction:column}.footer-credit{width:100%;justify-content:space-between}.toolbar{align-items:stretch}.filters{width:100%;overflow-x:auto;flex-wrap:nowrap;padding-bottom:8px;scrollbar-width:thin}.workflow-visual{grid-template-columns:1fr 1fr}.card{padding:20px}.skill-check-entry-actions{align-items:flex-start;flex-direction:column}.skill-card-preview{width:min(100%,310px)}.skill-check-shell{padding:22px}.skill-result-brand,.skill-result-user{top:10px;min-height:30px;font-size:9px;padding:3px 7px 3px 3px}.skill-result-brand{left:10px}.skill-result-user{right:10px}.skill-result-avatar,.skill-result-logo{width:23px;height:23px}.skill-result-footer{left:10px;right:10px;bottom:8px;gap:5px;padding:6px 8px;font-size:7px;min-height:28px}.skill-result-footer strong{font-size:9px}.skill-next-actions .btn,.skill-share-actions .btn{flex:1 1 150px}.skill-share-actions{position:sticky;bottom:10px;z-index:4;padding:10px;border-radius:16px;background:rgba(3,6,13,.9);backdrop-filter:blur(12px)}}
/* ==========================================
   THEME TOGGLE - LIGHT MODE
   ========================================== */
:root[data-theme="light"] {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --blue: #2563eb;
  --cyan: #0891b2;
  --muted: #4b5563;
  --text-primary: #111827;
  --text-secondary: #374151;
  --text-muted: #6b7280;
  --border: rgba(0,0,0,0.08);
  --border-hover: rgba(37,99,235,0.25);
  --nav-bg: rgba(255,255,255,0.88);
  --nav-border: rgba(0,0,0,0.06);
  --card-bg: #ffffff;
  --card-glass: linear-gradient(145deg,rgba(255,255,255,0.95),rgba(245,247,250,0.85));
  --card-border: rgba(0,0,0,0.07);
  --card-shadow: 0 4px 24px rgba(0,0,0,0.06),inset 0 1px rgba(255,255,255,0.5);
  --btn-bg: rgba(0,0,0,0.03);
  --btn-border: rgba(0,0,0,0.1);
  --input-bg: #ffffff;
  --input-border: rgba(0,0,0,0.12);
  --code-bg: #f3f4f6;
  --hero-gradient: linear-gradient(180deg,rgba(255,255,255,0),rgba(245,247,250,1) 98%);
  --hero-after: linear-gradient(180deg,rgba(255,255,255,0.18) 0,rgba(255,255,255,0.46) 48%,rgba(255,255,255,0.86) 100%),linear-gradient(90deg,#f5f7fa,rgba(255,255,255,0.28) 24%,rgba(255,255,255,0.22) 76%,#f5f7fa);
  --section-border: rgba(0,0,0,0.05);
  --navbar-color: #4b5563;
  --navbar-hover: #111827;
  --hero-title: #111827;
  --hero-copy: #4b5563;
  --footer-bg: linear-gradient(180deg,#eef1f5,#e5e9ef);
  --footer-border: rgba(0,0,0,0.08);
  --footer-text: #6b7280;
  --footer-heading: #111827;
  --footer-link: #4b5563;
  --footer-link-hover: #111827;
  --footer-credit: #9ca3af;
  --stat-float-border: rgba(0,0,0,0.08);
  --glow-opacity: 0.03;
  --eyebrow-bg: rgba(37,99,235,0.06);
  --eyebrow-border: rgba(37,99,235,0.12);
  --eyebrow-text: #2563eb;
  --section-no: #2563eb;
  --quiz-option-bg: #ffffff;
  --quiz-option-text: #374151;
  --quiz-option-hover-bg: rgba(37,99,235,0.06);
  --timeline-meta: #6b7280;
  --prose-text: #374151;
  --callout-bg: rgba(37,99,235,0.05);
  --callout-border: #2563eb;
  --callout-text: #1e40af;
}

:root[data-theme="light"] body {
  background: var(--bg);
  color: var(--text-primary);
  background-image: radial-gradient(circle at 20% 10%,rgba(37,99,235,0.04),transparent 25%),linear-gradient(rgba(0,0,0,0.025) 1px,transparent 0),linear-gradient(90deg,rgba(0,0,0,0.025) 1px,transparent 0);
  background-size: auto,64px 64px,64px 64px;
}

:root[data-theme="light"] .nav {
  background: var(--nav-bg);
  border-bottom-color: var(--nav-border);
  backdrop-filter: blur(18px);
}

:root[data-theme="light"] .nav-links {
  color: var(--navbar-color);
}

:root[data-theme="light"] .nav-links a.active,
:root[data-theme="light"] .nav-links a:hover,
:root[data-theme="light"] .nav-more-btn.active {
  color: var(--navbar-hover);
}

:root[data-theme="light"] .nav-more-btn {
  color: var(--navbar-color);
}

:root[data-theme="light"] .nav-more-btn:hover {
  color: var(--navbar-hover);
}

:root[data-theme="light"] .nav-dropdown {
  background: #ffffff;
  border-color: var(--border);
}

:root[data-theme="light"] .nav-dropdown a {
  color: var(--navbar-color);
}

:root[data-theme="light"] .nav-dropdown a:hover {
  color: var(--navbar-hover);
  background: rgba(0,0,0,0.03);
}

:root[data-theme="light"] .glass {
  background: var(--card-glass);
  border-color: var(--card-border);
  box-shadow: var(--card-shadow);
}

:root[data-theme="light"] .card {
  background: var(--card-bg);
  border-color: var(--card-border);
}

:root[data-theme="light"] .card:hover {
  border-color: var(--blue);
  box-shadow: 0 16px 48px rgba(0,0,0,0.08),0 0 24px rgba(37,99,235,0.08);
}

:root[data-theme="light"] .hero:after {
  background: var(--hero-after);
}

:root[data-theme="light"] .hero h1 {
  color: var(--hero-title);
}

:root[data-theme="light"] .hero-copy {
  color: var(--hero-copy);
}

:root[data-theme="light"] .section {
  border-bottom-color: var(--section-border);
}

:root[data-theme="light"] .section-dark {
  background: rgba(0,0,0,0.02);
}

:root[data-theme="light"] .btn {
  border-color: var(--btn-border);
  background: var(--btn-bg);
  color: var(--text-primary);
}

:root[data-theme="light"] .btn:hover {
  border-color: var(--blue);
  box-shadow: 0 6px 24px rgba(37,99,235,0.12);
}

:root[data-theme="light"] .btn-primary {
  background: linear-gradient(135deg,#2563eb,#1d4ed8);
  border-color: #3b82f6;
  color: white;
}

.btn-ghost{background:transparent;border-color:rgba(255,255,255,.08);color:#aab6c6}.btn-ghost:hover{background:rgba(255,255,255,.04);border-color:rgba(122,184,255,.25);color:white;transform:translateY(-1px)}
:root[data-theme="light"] .btn-soft {
  background: rgba(37,99,235,0.08);
  border-color: rgba(37,99,235,0.2);
  color: #1e40af;
}

:root[data-theme="light"] .btn-soft:hover {
  background: rgba(37,99,235,0.14);
  border-color: rgba(37,99,235,0.35);
}

:root[data-theme="light"] .search {
  background: var(--input-bg);
  border-color: var(--input-border);
  color: var(--text-primary);
}

:root[data-theme="light"] .search:focus {
  border-color: var(--blue);
}

:root[data-theme="light"] .filter {
  border-color: var(--border);
  color: var(--text-muted);
}

:root[data-theme="light"] .filter.active {
  background: #dbeafe;
  border-color: var(--blue);
  color: #1d4ed8;
}

:root[data-theme="light"] .footer {
  background: var(--footer-bg);
  border-top-color: var(--footer-border);
}

:root[data-theme="light"] .footer:before {
  border-top-color: rgba(37,99,235,0.15);
  box-shadow: 0 -22px 80px rgba(37,99,235,0.08);
}

:root[data-theme="light"] .footer-desc,
:root[data-theme="light"] .footer-links a {
  color: var(--footer-text);
}

:root[data-theme="light"] .footer-links a:hover {
  color: var(--footer-link-hover);
  text-decoration-color: rgba(0,0,0,0.2);
}

:root[data-theme="light"] .footer-col h3 {
  color: var(--footer-heading);
}

:root[data-theme="light"] .footer-credit {
  color: var(--footer-credit);
}

:root[data-theme="light"] .footer-credit a {
  color: var(--footer-text);
}

:root[data-theme="light"] .footer-credit a:hover {
  color: var(--footer-link-hover);
}

:root[data-theme="light"] .stat-float {
  border-color: var(--stat-float-border);
}

:root[data-theme="light"] .stat-float strong {
  color: var(--text-primary);
}

:root[data-theme="light"] .stat-float span {
  color: var(--text-muted);
}

:root[data-theme="light"] .eyebrow {
  background: var(--eyebrow-bg);
  border-color: var(--eyebrow-border);
  color: var(--eyebrow-text);
}

:root[data-theme="light"] .section-no {
  color: var(--section-no);
}

:root[data-theme="light"] .section h2,
:root[data-theme="light"] .page-hero h1 {
  color: var(--hero-title);
}

:root[data-theme="light"] .section-lead,
:root[data-theme="light"] .page-hero p {
  color: var(--hero-copy);
}

:root[data-theme="light"] .card h3 {
  color: var(--text-primary);
}

:root[data-theme="light"] .card p {
  color: var(--text-secondary);
}

:root[data-theme="light"] .card-top {
  color: var(--blue);
}

:root[data-theme="light"] .pill {
  background: rgba(37,99,235,0.06);
  border-color: rgba(37,99,235,0.14);
  color: #1d4ed8;
}

:root[data-theme="light"] .muted {
  color: var(--text-muted);
}

:root[data-theme="light"] .quiz-option {
  background: var(--quiz-option-bg);
  border-color: var(--border);
  color: var(--quiz-option-text);
}

:root[data-theme="light"] .quiz-option:hover,
:root[data-theme="light"] .quiz-option.selected {
  border-color: var(--blue);
  background: var(--quiz-option-hover-bg);
  color: var(--blue);
}

:root[data-theme="light"] .timeline-meta {
  color: var(--timeline-meta);
}

:root[data-theme="light"] .prose p {
  color: var(--prose-text);
}

:root[data-theme="light"] .copybox {
  background: var(--code-bg);
  border-color: rgba(0,0,0,0.12);
  color: var(--text-secondary);
}

:root[data-theme="light"] .callout {
  background: var(--callout-bg);
  border-left-color: var(--callout-border);
  color: var(--callout-text);
}

:root[data-theme="light"] .concept-accordion details {
  border-color: var(--border);
  background: var(--card-glass);
}

:root[data-theme="light"] .concept-accordion summary {
  color: var(--text-primary);
}

:root[data-theme="light"] .concept-accordion summary span:first-child {
  color: var(--blue);
}

:root[data-theme="light"] .concept-body strong {
  color: var(--text-primary);
}

:root[data-theme="light"] .list {
  color: var(--text-secondary);
}

:root[data-theme="light"] .menu-toggle {
  background: #ffffff;
  border-color: var(--border);
  color: var(--text-primary);
}

:root[data-theme="light"] .mobile-menu {
  background: rgba(255,255,255,0.97);
  border-top-color: var(--border);
}

:root[data-theme="light"] .mobile-menu a {
  border-color: var(--border);
  color: var(--navbar-color);
}

:root[data-theme="light"] .mobile-menu a:hover,
:root[data-theme="light"] .mobile-menu a.active {
  border-color: rgba(37,99,235,0.3);
  background: rgba(37,99,235,0.06);
  color: var(--blue);
}

:root[data-theme="light"] .progress {
  background: #e5e7eb;
}

:root[data-theme="light"] .lesson-row {
  border-bottom-color: var(--border);
}

:root[data-theme="light"] .skill-username-prompt {
  background: rgba(37,99,235,0.04);
  border-color: rgba(37,99,235,0.12);
  color: var(--blue);
}

:root[data-theme="light"] .skill-username-field input {
  background: #ffffff;
  border-color: var(--border);
  color: var(--text-primary);
}

:root[data-theme="light"] .workflow-node {
  border-color: rgba(37,99,235,0.18);
  background: rgba(37,99,235,0.06);
}

:root[data-theme="light"] .workflow-node span {
  color: var(--blue);
}

:root[data-theme="light"] .steps p {
  color: var(--text-secondary);
}

:root[data-theme="light"] .hero-bg {
  background: radial-gradient(ellipse at 50% 42%,rgba(37,99,235,0.12),transparent 40%),radial-gradient(circle at 72% 28%,rgba(0,194,255,0.06),transparent 27%),#f5f7fa;
}

:root[data-theme="light"] .hero-bg:before {
  opacity: 0.3;
}

:root[data-theme="light"] .hero:before {
  opacity: 0.05;
}

:root[data-theme="light"] .skill-card-preview {
  background: #ffffff;
  border-color: var(--border);
  box-shadow: 0 28px 70px rgba(0,0,0,0.08),0 0 36px rgba(37,99,235,0.08);
}

:root[data-theme="light"] .progression-step span {
  background: rgba(37,99,235,0.08);
  border-color: rgba(37,99,235,0.18);
  color: var(--blue);
}

:root[data-theme="light"] .section-no {
  color: var(--blue);
}

:root[data-theme="light"] .brand-mark {
  border-color: rgba(37,99,235,0.35);
}

/* Toggle Button Styles */
.theme-toggle, .lang-toggle {
  background: none;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  padding: 6px 8px;
  cursor: pointer;
  color: #aeb9c8;
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  transition: all 0.2s ease;
  line-height: 1;
}

.theme-toggle:hover, .lang-toggle:hover {
  border-color: rgba(122,184,255,0.45);
  color: white;
}

:root[data-theme="light"] .theme-toggle,
:root[data-theme="light"] .lang-toggle {
  border-color: rgba(0,0,0,0.1);
  color: var(--text-muted);
}

:root[data-theme="light"] .theme-toggle:hover,
:root[data-theme="light"] .lang-toggle:hover {
  border-color: var(--blue);
  color: var(--text-primary);
}

/* Floating Controls - bottom right corner */
.floating-controls {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.floating-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(14,20,34,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: #aeb9c8;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  font-size: 13px;
  font-weight: 650;
  line-height: 1;
  padding: 0;
}

.floating-btn:hover {
  border-color: rgba(122,184,255,0.45);
  color: white;
  transform: scale(1.08);
  box-shadow: 0 6px 24px rgba(47,123,255,0.25);
}

.floating-btn:active {
  transform: scale(0.95);
}

:root[data-theme="light"] .floating-btn {
  background: rgba(255,255,255,0.9);
  border-color: rgba(0,0,0,0.1);
  color: var(--text-muted);
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

:root[data-theme="light"] .floating-btn:hover {
  border-color: var(--blue);
  color: var(--text-primary);
  box-shadow: 0 6px 24px rgba(37,99,235,0.15);
}

@media (max-width: 640px) {
  .floating-controls {
    bottom: 16px;
    right: 16px;
    gap: 6px;
  }
  .floating-btn {
    width: 38px;
    height: 38px;
  }
}
/* === NEW NAV SYSTEM === */
.nav-desktop {
  display: flex;
  align-items: center;
  gap: 22px;
  color: #aeb9c8;
  font-size: 13px;
}

.nav-desktop a {
  color: #aeb9c8;
  text-decoration: none;
}

.nav-desktop a:hover,
.nav-desktop a.active {
  color: white;
}

.nav-more {
  position: relative;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 10px;
  background: #0b111d;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 13px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: white;
  border-radius: 2px;
  transition: all 0.3s;
}

.hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

.mobile-nav {
  display: none;
  border-top: 1px solid rgba(255,255,255,0.07);
  background: rgba(3,6,13,0.97);
  padding: 20px 0;
}

.mobile-nav.open {
  display: block;
}

.mobile-nav .container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.mobile-nav a {
  padding: 13px 14px;
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 13px;
  color: #b9c4d2;
  font-size: 13px;
  text-decoration: none;
}

.mobile-nav a:hover,
.mobile-nav a.active {
  color: white;
  border-color: rgba(47,123,255,0.45);
  background: rgba(47,123,255,0.09);
}

@media (max-width: 900px) {
  .nav-desktop {
    display: none !important;
  }
  
  .hamburger {
    display: flex !important;
  }
}