@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,500;0,700;1,400;1,500&family=DM+Mono:ital,wght@0,300;0,400;0,500;1,300&family=Lora:ital,wght@0,400;0,500;1,400&display=swap');

:root, [data-theme="dark"] {
  --bg:#0C0C0A; --bg-surface:#131311; --bg-raised:#1A1A17;
  --border:#252520; --border-soft:#1E1E1B;
  --text-primary:#F0EAE0; --text-secondary:#8C8679; --text-muted:#524F49;
  --accent:#C4A882; --accent-dim:#7A6A55; --accent-glow:rgba(196,168,130,0.08);
  --green:#6B8F71; --amber:#C4944A; --red:#A05050; --blue-c:#5A7A9F; --purple:#7A6A9F;
}
[data-theme="light"] {
  --bg:#F5F2ED; --bg-surface:#FAFAF8; --bg-raised:#EEEAE3;
  --border:#D8D2C8; --border-soft:#E4DFD7;
  --text-primary:#1A1814; --text-secondary:#5A5550; --text-muted:#9A9590;
  --accent:#8B6840; --accent-dim:#C4A882; --accent-glow:rgba(139,104,64,0.08);
  --green:#3D6B44; --amber:#8B5E1A; --red:#7A3030; --blue-c:#2A5080; --purple:#503A80;
}
[data-theme="blue"] {
  --bg:#060B14; --bg-surface:#0A1220; --bg-raised:#0F1C30;
  --border:#162540; --border-soft:#122035;
  --text-primary:#C8D8F0; --text-secondary:#6A8AB0; --text-muted:#344A65;
  --accent:#5A9ED6; --accent-dim:#2A5A8A; --accent-glow:rgba(90,158,214,0.1);
  --green:#3A8A6A; --amber:#8A6A2A; --red:#7A3A4A; --blue-c:#4A7AB0; --purple:#5A4A9A;
}
.theme-toggle{display:flex;align-items:center;gap:0.2rem;background:var(--bg-surface);border:1px solid var(--border);border-radius:20px;padding:0.2rem 0.3rem}
.theme-btn{font-family:'DM Mono',monospace;font-size:0.62rem;letter-spacing:0.08em;text-transform:uppercase;background:transparent;border:1px solid transparent;border-radius:16px;padding:0.25rem 0.6rem;color:var(--text-muted);cursor:pointer;transition:all 0.2s;white-space:nowrap}
.theme-btn:hover{color:var(--text-secondary)}
.theme-btn.active{background:var(--bg-raised);border-color:var(--border);color:var(--accent)}
.nav__right{display:flex;align-items:center;gap:1rem}
body{transition:background-color 0.3s,color 0.3s}
[data-theme="light"] .nav.scrolled{background:rgba(245,242,237,0.97)}
[data-theme="blue"] .nav.scrolled{background:rgba(6,11,20,0.97)}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{background-color:var(--bg);color:var(--text-primary);font-family:var(--font-body);font-size:1rem;line-height:1.75;min-height:100vh;overflow-x:hidden}
body::before{content:'';position:fixed;inset:0;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");pointer-events:none;z-index:999;opacity:0.35}
h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:500;line-height:1.2;color:var(--text-primary)}
h1{font-size:clamp(2.4rem,5vw,4rem);letter-spacing:-0.02em}
h2{font-size:clamp(1.6rem,3vw,2.4rem);letter-spacing:-0.01em}
h3{font-size:clamp(1.2rem,2vw,1.6rem)}
h4{font-size:1.1rem;font-family:var(--font-mono);font-weight:400;letter-spacing:0.05em;color:var(--text-secondary);text-transform:uppercase}
p{margin-bottom:1.25rem;color:var(--text-primary)}
p:last-child{margin-bottom:0}
a{color:var(--accent);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--text-primary)}
code,.mono{font-family:var(--font-mono);font-size:0.85em;background:var(--bg-raised);border:1px solid var(--border);padding:0.1em 0.4em;border-radius:var(--radius);color:var(--accent)}
pre{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.5rem;overflow-x:auto;font-family:var(--font-mono);font-size:0.875rem;line-height:1.6;color:var(--text-primary)}
blockquote{border-left:2px solid var(--accent-dim);padding-left:1.5rem;color:var(--text-secondary);font-style:italic;margin:1.5rem 0}
hr{border:none;border-top:1px solid var(--border);margin:3rem 0}
.container{max-width:1200px;margin:0 auto;padding:0 2rem}
.container--narrow{max-width:740px;margin:0 auto;padding:0 2rem}
.nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:1.25rem 2rem;display:flex;align-items:center;justify-content:space-between;background:linear-gradient(to bottom,rgba(12,12,10,0.98) 0%,rgba(12,12,10,0) 100%);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:border-color var(--transition)}
.nav.scrolled{border-bottom-color:var(--border)}
.nav__logo{font-family:var(--font-display);font-size:1.3rem;font-weight:500;color:var(--text-primary);letter-spacing:-0.01em;transition:color var(--transition)}
.nav__logo:hover{color:var(--accent)}
.nav__logo span{color:var(--accent)}
.nav__links{display:flex;align-items:center;gap:2.5rem;list-style:none}
.nav__links a{font-family:var(--font-mono);font-size:0.75rem;letter-spacing:0.1em;text-transform:uppercase;color:var(--text-secondary);transition:color var(--transition)}
.nav__links a:hover,.nav__links a.active{color:var(--text-primary)}
.nav__version{font-family:var(--font-mono);font-size:0.7rem;color:var(--text-muted);border:1px solid var(--border);padding:0.2rem 0.6rem;border-radius:20px}
.btn{display:inline-flex;align-items:center;gap:0.5rem;font-family:var(--font-mono);font-size:0.8rem;letter-spacing:0.08em;text-transform:uppercase;padding:0.75rem 1.5rem;border-radius:var(--radius);border:1px solid;cursor:pointer;transition:all var(--transition);text-decoration:none}
.btn--primary{background:var(--accent);border-color:var(--accent);color:var(--bg)}
.btn--primary:hover{background:var(--text-primary);border-color:var(--text-primary);color:var(--bg)}
.btn--ghost{background:transparent;border-color:var(--border);color:var(--text-secondary)}
.btn--ghost:hover{border-color:var(--accent);color:var(--accent)}
.card{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.75rem;transition:border-color var(--transition),background var(--transition);position:relative;overflow:hidden}
.card:hover{border-color:var(--accent-dim);background:var(--bg-raised)}
.card::before{content:'';position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--accent-dim),transparent);opacity:0;transition:opacity var(--transition)}
.card:hover::before{opacity:1}
.badge{display:inline-flex;align-items:center;font-family:var(--font-mono);font-size:0.68rem;letter-spacing:0.08em;text-transform:uppercase;padding:0.2rem 0.6rem;border-radius:20px;border:1px solid}
.badge--beginner{color:var(--green);border-color:var(--green);background:rgba(107,143,113,0.08)}
.badge--intermediate{color:var(--amber);border-color:var(--amber);background:rgba(196,148,74,0.08)}
.badge--advanced{color:var(--red);border-color:var(--red);background:rgba(160,80,80,0.08)}
.badge--core{color:var(--accent);border-color:var(--accent-dim);background:var(--accent-glow)}
.badge--optional{color:var(--text-secondary);border-color:var(--border)}
.badge--deprecated{color:var(--text-muted);border-color:var(--text-muted);text-decoration:line-through}
.tag{display:inline-block;font-family:var(--font-mono);font-size:0.65rem;color:var(--text-muted);background:var(--bg-raised);border:1px solid var(--border-soft);padding:0.15rem 0.5rem;border-radius:3px;letter-spacing:0.06em}
.resource-card{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.25rem 1.5rem;display:grid;grid-template-columns:auto 1fr auto;gap:1rem;align-items:start;transition:border-color var(--transition),transform var(--transition);text-decoration:none;color:inherit}
.resource-card:hover{border-color:var(--accent-dim);transform:translateY(-1px);color:inherit}
.resource-card__icon{font-size:1.25rem;width:2rem;text-align:center;margin-top:0.1rem}
.resource-card__id{font-family:var(--font-mono);font-size:0.65rem;color:var(--text-muted);letter-spacing:0.1em}
.resource-card__title{font-family:var(--font-display);font-size:1rem;font-weight:500;color:var(--text-primary);margin-bottom:0.25rem;line-height:1.3}
.resource-card__meta{display:flex;flex-wrap:wrap;gap:0.4rem;align-items:center;margin-top:0.5rem}
.resource-card__time{font-family:var(--font-mono);font-size:0.65rem;color:var(--text-muted)}
.resource-card__arrow{color:var(--text-muted);transition:transform var(--transition),color var(--transition);font-size:1rem;margin-top:0.2rem}
.resource-card:hover .resource-card__arrow{transform:translate(3px,-3px);color:var(--accent)}
.callout{border-radius:var(--radius-lg);padding:1.25rem 1.5rem;margin:1.75rem 0;border-left:3px solid;background:var(--bg-surface)}
.callout__label{font-family:var(--font-mono);font-size:0.7rem;letter-spacing:0.12em;text-transform:uppercase;font-weight:500;margin-bottom:0.6rem;display:flex;align-items:center;gap:0.5rem}
.callout--definition{border-left-color:var(--blue)}
.callout--definition .callout__label{color:var(--blue)}
.callout--exercise{border-left-color:var(--green)}
.callout--exercise .callout__label{color:var(--green)}
.callout--pitfall{border-left-color:var(--amber)}
.callout--pitfall .callout__label{color:var(--amber)}
.callout--checklist{border-left-color:var(--purple)}
.callout--checklist .callout__label{color:var(--purple)}
.callout--note{border-left-color:var(--accent-dim)}
.callout--note .callout__label{color:var(--accent)}
.checklist{list-style:none}
.checklist li{display:flex;align-items:flex-start;gap:0.75rem;padding:0.35rem 0;font-size:0.95rem;color:var(--text-secondary)}
.checklist li::before{content:'\u25a1';font-family:var(--font-mono);color:var(--purple);flex-shrink:0;margin-top:0.1rem}
.table-wrap{overflow-x:auto;margin:1.5rem 0}
table{width:100%;border-collapse:collapse;font-size:0.875rem;font-family:var(--font-mono)}
thead tr{border-bottom:1px solid var(--accent-dim)}
th{text-align:left;padding:0.75rem 1rem;font-size:0.65rem;letter-spacing:0.1em;text-transform:uppercase;color:var(--text-secondary);font-weight:400}
td{padding:0.75rem 1rem;border-bottom:1px solid var(--border-soft);color:var(--text-secondary);vertical-align:top;font-family:var(--font-mono);font-size:0.8rem}
tr:hover td{background:var(--bg-raised)}
td:first-child{color:var(--accent)}
.page-header{padding:8rem 0 4rem;border-bottom:1px solid var(--border)}
.page-header__eyebrow{font-family:var(--font-mono);font-size:0.72rem;letter-spacing:0.15em;text-transform:uppercase;color:var(--accent);margin-bottom:1rem;display:flex;align-items:center;gap:0.75rem}
.page-header__eyebrow::before{content:'';display:block;width:2rem;height:1px;background:var(--accent)}
.page-header__title{margin-bottom:1.25rem}
.page-header__subtitle{font-size:1.1rem;color:var(--text-secondary);font-style:italic;max-width:600px;line-height:1.65}
.section{padding:5rem 0;border-bottom:1px solid var(--border-soft)}
.section:last-child{border-bottom:none}
.section-divider{display:flex;align-items:center;gap:1rem;margin-bottom:3.5rem}
.section-divider__label{font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.2em;text-transform:uppercase;color:var(--text-muted);white-space:nowrap}
.section-divider__line{flex:1;height:1px;background:var(--border)}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.footer{padding:3rem 0;border-top:1px solid var(--border);margin-top:6rem}
.footer__inner{display:flex;align-items:center;justify-content:space-between;gap:2rem}
.footer__copy{font-family:var(--font-mono);font-size:0.72rem;color:var(--text-muted)}
.footer__links{display:flex;gap:2rem;list-style:none}
.footer__links a{font-family:var(--font-mono);font-size:0.72rem;color:var(--text-muted);transition:color var(--transition)}
.footer__links a:hover{color:var(--accent)}
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.animate-fade-up{animation:fadeUp 0.6s cubic-bezier(0.4,0,0.2,1) both}
.animate-fade-in{animation:fadeIn 0.4s cubic-bezier(0.4,0,0.2,1) both}
.delay-1{animation-delay:0.1s}.delay-2{animation-delay:0.2s}.delay-3{animation-delay:0.3s}.delay-4{animation-delay:0.4s}.delay-5{animation-delay:0.5s}
.doc-layout{display:grid;grid-template-columns:260px 1fr;gap:0;min-height:100vh;padding-top:4rem}
.doc-sidebar{position:sticky;top:4rem;height:calc(100vh - 4rem);overflow-y:auto;padding:2.5rem 1.5rem;border-right:1px solid var(--border);scrollbar-width:thin;scrollbar-color:var(--border) transparent}
.doc-sidebar::-webkit-scrollbar{width:4px}
.doc-sidebar::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}
.doc-sidebar__title{font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.15em;text-transform:uppercase;color:var(--text-muted);margin-bottom:1.5rem;padding-bottom:0.75rem;border-bottom:1px solid var(--border)}
.doc-nav{list-style:none}
.doc-nav__chapter{margin-bottom:1.5rem}
.doc-nav__chapter-title{font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.12em;text-transform:uppercase;color:var(--text-muted);padding:0.3rem 0;display:flex;align-items:center;gap:0.5rem}
.doc-nav__links{list-style:none;margin-top:0.25rem}
.doc-nav__links a{display:block;font-family:var(--font-body);font-size:0.85rem;color:var(--text-secondary);padding:0.35rem 0.75rem;border-radius:var(--radius);border-left:2px solid transparent;transition:all var(--transition);line-height:1.4}
.doc-nav__links a:hover{color:var(--text-primary);border-left-color:var(--accent-dim);background:var(--bg-raised)}
.doc-nav__links a.active{color:var(--accent);border-left-color:var(--accent);background:var(--accent-glow)}
.doc-content{padding:3rem 4rem 6rem;max-width:780px}
.filter-bar{display:flex;gap:0.5rem;flex-wrap:wrap;margin-bottom:2.5rem}
.filter-btn{font-family:var(--font-mono);font-size:0.68rem;letter-spacing:0.08em;text-transform:uppercase;padding:0.4rem 0.9rem;border:1px solid var(--border);border-radius:20px;background:transparent;color:var(--text-secondary);cursor:pointer;transition:all var(--transition)}
.filter-btn:hover,.filter-btn.active{border-color:var(--accent);color:var(--accent);background:var(--accent-glow)}
.status-dot{display:inline-block;width:6px;height:6px;border-radius:50%;margin-right:6px;vertical-align:middle}
.status-dot--core{background:var(--green)}
.status-dot--optional{background:var(--text-muted)}
.status-dot--watchlist{background:var(--amber)}
.status-dot--deprecated{background:var(--red)}
.glossary-term{padding:1.25rem 0;border-bottom:1px solid var(--border-soft)}
.glossary-term:last-child{border-bottom:none}
.glossary-term__word{font-family:var(--font-display);font-size:1.1rem;margin-bottom:0.4rem}
.glossary-term__def{font-size:0.92rem;color:var(--text-secondary);line-height:1.65;margin:0}
.changelog-entry{padding:1.5rem 0;border-bottom:1px solid var(--border-soft)}
.changelog-entry__version{font-family:var(--font-mono);font-size:0.85rem;color:var(--accent);margin-bottom:0.3rem}
.changelog-entry__date{font-family:var(--font-mono);font-size:0.72rem;color:var(--text-muted);margin-bottom:0.75rem}
.resource-grid{display:grid;gap:0.75rem;margin-top:1rem}
.lesson{margin-bottom:4rem}
.lesson__header{border-bottom:1px solid var(--border);padding-bottom:1rem;margin-bottom:1.75rem}
.lesson__title{font-size:1.4rem;margin-bottom:0.4rem}
.lesson__objectives{list-style:none;margin:1rem 0}
.lesson__objectives li{display:flex;gap:0.75rem;padding:0.3rem 0;font-size:0.92rem;color:var(--text-secondary)}
.lesson__objectives li::before{content:'\u2192';font-family:var(--font-mono);color:var(--accent-dim);flex-shrink:0}
.chapter-header{display:flex;align-items:center;gap:1rem;margin-bottom:2rem}
.chapter-header__badge{font-family:var(--font-mono);font-size:0.65rem;padding:0.3rem 0.7rem;border-radius:20px;border:1px solid;flex-shrink:0}
@media(max-width:1024px){.doc-layout{grid-template-columns:220px 1fr}.doc-content{padding:2.5rem 2rem 5rem}}
@media(max-width:768px){.doc-layout{grid-template-columns:1fr}.doc-sidebar{display:none}.nav__links{display:none}.grid-2,.grid-3{grid-template-columns:1fr}.footer__inner{flex-direction:column;align-items:flex-start}.page-header{padding:6rem 0 3rem}}