/* ==========================================================================
   HanziPeek · chinesekey.org
   Design tokens per 01-design-spec.md — do not add colors outside this list.
   ========================================================================== */

:root{
  --bg:      oklch(0.958 0.010 85);
  --card:    oklch(0.995 0.004 85);
  --tint:    oklch(0.982 0.008 85);
  --line:    oklch(0.885 0.008 70);
  --line3:   oklch(0.930 0.008 85);
  --ink:     oklch(0.255 0.012 60);
  --mid:     oklch(0.470 0.010 60);
  --dim:     oklch(0.620 0.008 60);
  --indigo:  oklch(0.450 0.110 268);
  --indigo-d:oklch(0.350 0.110 268);
  --verm:    oklch(0.545 0.170 32);
  --red:     oklch(0.500 0.160 32);

  --shadow: 0 18px 40px -30px oklch(0.255 0.012 60 / .5);
  --max: 1180px;

  --serif: 'Noto Serif SC', serif;
  --sans: 'Noto Sans SC', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', monospace;
  --hanzi-fallback: 'KaiXinSong', 'BabelStone Han', 'Noto Serif CJK SC', 'Noto Serif SC', serif;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
  line-height:1.5;
}
p, li{ text-wrap: pretty; }
h1,h2{ text-wrap: balance; }
a{ color:var(--indigo); text-decoration:none; }
a:hover{ color:var(--indigo-d); }
img{ max-width:100%; display:block; }
button{ font-family:inherit; }

.wrap{ max-width:var(--max); margin:0 auto; padding:0 48px; }
@media (max-width:768px){ .wrap{ padding:0 18px; } }

section{ padding:80px 0; }
section.tint{ background:var(--tint); }
@media (max-width:768px){ section{ padding:30px 0; } }

/* i18n visibility ------------------------------------------------------- */
[data-l="zh"]{ display:none; }
html[data-lang="zh"] [data-l="zh"]{ display:revert; }
html[data-lang="zh"] [data-l="en"]{ display:none; }

/* Focus ------------------------------------------------------------------ */
:focus-visible{ outline:2px solid var(--indigo); outline-offset:2px; }

/* ==========================================================================
   Header / Footer
   ========================================================================== */
.site-header{
  position:sticky; top:0; z-index:50;
  height:66px;
  display:flex; align-items:center;
  background:var(--card);
  border-bottom:1px solid var(--line3);
}
.site-header .wrap{ display:flex; align-items:center; gap:28px; width:100%; }
.brand{ display:flex; align-items:baseline; gap:8px; flex:none; white-space:nowrap; }
.brand .name{ font-family:var(--serif); font-weight:700; font-size:19px; color:var(--ink); }
.brand .domain{ font-family:var(--mono); font-size:11px; color:var(--dim); }
.site-nav{ display:flex; align-items:center; gap:26px; margin-left:8px; }
.site-nav a{ color:var(--mid); font-size:14.5px; white-space:nowrap; }
.site-nav a:hover, .site-nav a.active{ color:var(--ink); }
.site-nav a.mobile-cta, .site-nav a.mobile-cta:hover{ color:#fff; }
a.mobile-cta{ display:none; }
.header-actions{ margin-left:auto; display:flex; align-items:center; gap:14px; }
.lang-toggle{
  display:inline-flex; align-items:center; gap:2px;
  border:1px solid var(--line); border-radius:8px; padding:2px;
  background:var(--tint); flex:none;
}
.lang-toggle button{
  border:none; background:none; padding:5px 10px; border-radius:6px;
  font-family:var(--mono); font-size:11.5px; color:var(--dim); cursor:pointer;
  white-space:nowrap;
}
.lang-toggle button.active{ background:var(--card); color:var(--indigo-d); font-weight:600; }
.nav-toggle{ display:none; }

.site-header .btn{ min-height:40px; padding:0 16px; font-size:13.5px; white-space:nowrap; }
@media (max-width:1000px){
  .site-nav{ display:none; }
  .nav-toggle{
    display:inline-flex; margin-left:auto; width:38px; height:38px;
    align-items:center; justify-content:center; border:1px solid var(--line);
    border-radius:8px; background:var(--card); cursor:pointer;
  }
  .header-actions{ margin-left:0; }
  body.nav-open .site-nav{
    display:flex; position:absolute; top:66px; left:0; right:0;
    background:var(--card); border-bottom:1px solid var(--line3);
    flex-direction:column; align-items:flex-start; padding:16px 18px; gap:4px;
  }
  body.nav-open .site-nav a{ padding:10px 0; width:100%; }
}
@media (max-width:600px){
  .site-header .wrap{ gap:10px; }
  .brand .domain{ display:none; }
  .header-actions{ gap:8px; }
  .header-actions .btn{ display:none; }
  body.nav-open .site-nav{ gap:10px; }
  body.nav-open .site-nav::after{
    content:""; display:block;
  }
  .mobile-cta{ display:none; }
  body.nav-open a.mobile-cta{
    display:inline-flex; width:100%; margin-top:8px;
  }
}

.site-footer{ background:var(--card); border-top:1px solid var(--line3); padding:56px 0 30px; }
.footer-top{ display:flex; justify-content:space-between; gap:40px; flex-wrap:wrap; padding-bottom:36px; }
.footer-brand .name{ font-family:var(--serif); font-weight:700; font-size:19px; }
.footer-brand .tagline{ color:var(--mid); font-size:14px; margin-top:8px; max-width:320px; }
.footer-cols{ display:flex; gap:64px; flex-wrap:wrap; }
.footer-col h4{ font-size:11.5px; letter-spacing:.08em; text-transform:uppercase; color:var(--dim); margin:0 0 14px; font-weight:600; }
.footer-col a{ display:block; color:var(--mid); font-size:14px; padding:5px 0; }
.footer-col a:hover{ color:var(--ink); }
.footer-bottom{ border-top:1px solid var(--line3); padding-top:22px; color:var(--dim); font-size:12.5px; font-family:var(--mono); }
@media (max-width:768px){
  .footer-top{ flex-direction:column; gap:28px; }
  .footer-cols{ gap:36px; }
}

/* ==========================================================================
   Buttons / inputs / tags — shared components
   ========================================================================== */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  white-space:nowrap; min-height:48px; padding:0 24px; border-radius:10px;
  font-weight:700; font-size:15px; cursor:pointer; border:none; gap:8px;
}
.btn-primary{ background:var(--indigo); color:#fff; }
.btn-primary:hover{ background:var(--indigo-d); color:#fff; }
.btn-secondary{ background:#fff; color:var(--indigo-d); border:1.5px solid var(--line); }
.btn-secondary:hover{ border-color:var(--indigo); }
.btn-ghost{
  background:#fff; color:var(--dim); border:1px solid var(--line);
  min-height:38px; padding:0 16px; font-weight:500; font-size:13.5px; border-radius:10px;
}
.btn-ghost.active{ border:1.5px solid var(--indigo); background:oklch(0.450 0.110 268 / .08); color:var(--indigo-d); font-weight:700; }
@media (max-width:768px){ .btn{ width:100%; } }

.field-label{ display:block; font-size:13px; font-weight:600; color:var(--mid); margin-bottom:8px; }
input[type=text], input[type=email], select, textarea{
  width:100%; min-height:52px; border:1.5px solid var(--line); border-radius:11px;
  background:var(--card); padding:0 16px; font-family:var(--sans); font-size:15px; color:var(--ink);
}
input.hanzi-input{ font-family:var(--serif); font-size:19px; }
input:focus, select:focus, textarea:focus{ border-color:var(--indigo); outline:none; }
textarea{ padding:14px 16px; min-height:100px; }

.tag{
  display:inline-block; white-space:nowrap; border:1px solid oklch(0.545 0.170 32 / .45);
  color:var(--verm); font-size:11.5px; border-radius:6px; padding:3px 9px; font-family:var(--mono);
}

code, pre{ font-family:var(--mono); }
.code-block{
  background:var(--ink); color:var(--line3); font-family:var(--mono);
  font-size:12.5px; line-height:1.9; border-radius:12px; padding:20px 22px;
  overflow-x:auto; white-space:pre;
}
.code-block .tok-key{ color:oklch(0.72 0.10 268); }
.code-block .tok-str{ color:oklch(0.75 0.12 145); }
.code-block .tok-com{ color:oklch(0.55 0.01 60); }
.code-tab-label{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.13em; text-transform:uppercase;
  color:var(--dim); margin-bottom:10px; display:block;
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero{ padding:64px 0 76px; }
.hero .wrap{ display:grid; grid-template-columns:1.05fr .95fr; gap:64px; align-items:center; }
.eyebrow{
  font-family:var(--mono); font-size:11px; letter-spacing:.14em; color:var(--indigo-d);
  text-transform:uppercase; margin-bottom:18px; display:block;
}
.hero h1{ font-family:var(--serif); font-size:52px; line-height:1.18; margin:0 0 20px; font-weight:600; }
.hero .sub{ font-size:16.5px; line-height:1.85; color:var(--mid); max-width:520px; margin:0 0 32px; }
.hero-ctas{ display:flex; gap:14px; margin-bottom:28px; }
.hero-trust{ font-size:13px; color:var(--dim); display:flex; align-items:center; gap:10px; }
.hero-trust a{ color:var(--dim); text-decoration:underline; text-underline-offset:2px; }
.hero-visual{ display:flex; justify-content:center; }
@media (max-width:1179px){
  .hero .wrap{ grid-template-columns:1fr; gap:36px; }
  .hero-visual{ order:-1; }
}
@media (max-width:768px){
  .hero{ padding:24px 0 36px; }
  .hero h1{ font-size:29px; }
  .hero-ctas{ flex-direction:column; }
}

/* ==========================================================================
   Section headers
   ========================================================================== */
.section-head{ text-align:center; max-width:640px; margin:0 auto 44px; }
.section-head h2{ font-family:var(--serif); font-size:30px; margin:0 0 12px; font-weight:600; }
.section-head p{ color:var(--mid); font-size:15.5px; line-height:1.85; margin:0; }
@media (max-width:768px){ .section-head h2{ font-size:22px; } }

/* ==========================================================================
   Feature cards
   ========================================================================== */
.feature-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.feature-card{
  background:var(--card); border:1px solid var(--line3); border-radius:14px; padding:28px 24px;
}
.feature-card .glyph{
  font-family:var(--serif); font-size:32px; color:var(--indigo); margin-bottom:16px; line-height:1;
}
.feature-card h3{ font-size:17px; margin:0 0 8px; }
.feature-card p{ font-size:13.5px; color:var(--mid); line-height:1.8; margin:0; }
@media (max-width:1179px){ .feature-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:768px){ .feature-grid{ grid-template-columns:1fr; } }

/* ==========================================================================
   Decomposition Card (core component)
   ========================================================================== */
.dcard{
  background:var(--card); border:1px solid var(--line); border-radius:16px;
  padding:30px 28px; display:flex; flex-direction:column; gap:20px;
  box-shadow:var(--shadow); width:100%; max-width:440px;
}
.dcard-head{ display:flex; align-items:flex-start; justify-content:space-between; gap:12px; }
.dcard-headword{ display:flex; align-items:baseline; gap:14px; flex-wrap:wrap; }
.dcard-char{
  font-family:var(--serif); font-weight:600; white-space:nowrap; flex:none; line-height:1;
}
.dcard-char[data-kind="char"]{ font-size:84px; }
.dcard-char[data-kind="word"]{ font-size:58px; }
.dcard-pinyin{ font-family:var(--mono); font-size:16px; color:var(--mid); white-space:nowrap; flex:none; align-self:flex-end; }
.dcard-speak{
  border:none; background:none; color:var(--dim); cursor:pointer;
  width:26px; height:26px; border-radius:50%; display:inline-flex; align-items:center; justify-content:center;
  flex:none; align-self:flex-end; margin-bottom:1px;
}
.dcard-speak:hover{ background:var(--tint); color:var(--indigo-d); }
.dcard-speak.speaking{ color:var(--indigo); }
.dcard-speak svg{ width:15px; height:15px; }
.dcard-headmeta{ display:flex; align-items:center; gap:8px; flex:none; }
.dcard-conf{ font-family:var(--mono); font-size:11px; color:var(--dim); white-space:nowrap; }
.dcard-close{
  width:30px; height:30px; border-radius:8px; border:1px solid var(--line3);
  background:#fff; color:var(--dim); display:inline-flex; align-items:center; justify-content:center;
  cursor:pointer; flex:none; font-size:15px; line-height:1;
}
.dcard-close:hover{ color:var(--ink); border-color:var(--line); }

.dcard-split{ display:grid; grid-template-columns:1fr auto 1fr; align-items:stretch; gap:14px; }
.dcard-plus{ display:flex; align-items:center; justify-content:center; color:var(--dim); font-size:18px; }
.dcard-part{
  display:flex; flex-direction:column; align-items:center; gap:8px; text-align:center;
  border-radius:12px; padding:18px 10px;
}
.dcard-part.semantic{ background:oklch(0.545 0.170 32 / .07); border:1px solid oklch(0.545 0.170 32 / .3); }
.dcard-part.phonetic{ background:oklch(0.450 0.110 268 / .07); border:1px solid oklch(0.450 0.110 268 / .3); }
.dcard-part.neutral{ background:var(--tint); border:1px solid var(--line3); }
.dcard-part .glyph{ font-family:var(--hanzi-fallback); font-size:32px; }
.dcard-part.semantic .glyph{ color:var(--verm); }
.dcard-part.phonetic .glyph{ color:var(--indigo); }
.dcard-part .role{ font-size:11px; color:var(--mid); line-height:1.5; }

.dcard-explain{ border-top:1px solid var(--line3); padding-top:18px; }
.dcard-explain .type-line{ font-size:13.5px; font-weight:700; color:var(--ink); margin:0 0 6px; }
.dcard-explain .desc-line{ font-size:13.5px; line-height:1.85; color:var(--mid); margin:0; }

.dcard-path{
  font-family:var(--mono); font-size:11.5px; color:var(--mid); background:var(--tint);
  border:1px solid var(--line3); border-radius:8px; padding:10px 12px; line-height:1.8;
}
.dcard-path .k{ color:var(--dim); letter-spacing:.1em; margin-right:8px; }

.dcard-family{ display:flex; flex-direction:column; gap:8px; }
.dcard-family .fam-label{ font-family:var(--mono); font-size:10.5px; letter-spacing:.1em; color:var(--dim); text-transform:uppercase; }
.fam-row{ display:flex; gap:10px; flex-wrap:wrap; }
.fam-chip{
  display:inline-flex; align-items:baseline; gap:6px; white-space:nowrap; flex:none;
  border-radius:10px; padding:8px 12px; background:#fff; cursor:pointer; border:1.5px solid;
}
.fam-chip.semantic{ border-color:oklch(0.545 0.170 32 / .4); }
.fam-chip.phonetic{ border-color:oklch(0.450 0.110 268 / .4); }
.fam-chip .fc-char{ font-family:var(--serif); font-size:19px; }
.fam-chip .fc-pinyin{ font-family:var(--mono); font-size:10.5px; color:var(--dim); }

.dcard-source{ font-family:var(--mono); font-size:10.5px; color:var(--dim); }

.dcard-more{
  border:none; background:none; color:var(--indigo); font-weight:700; font-size:13.5px;
  text-align:center; cursor:pointer; padding:4px 0; border-top:1px solid var(--line3); padding-top:16px;
}
.dcard-more:hover{ color:var(--indigo-d); }

/* ---- v1.1: 双视角卡片 ------------------------------------------------- */
.dcard-viewtoggle{
  display:inline-flex; align-self:flex-start; gap:2px;
  background:oklch(0.955 0.008 85); border-radius:10px; padding:3px;
}
.dcard-viewtoggle button{
  border:none; background:transparent; color:var(--dim);
  height:34px; padding:0 16px; font-size:13px; font-weight:500;
  border-radius:8px; cursor:pointer; white-space:nowrap;
}
.dcard-viewtoggle button.active{
  background:#fff; color:var(--ink); font-weight:700;
  box-shadow:0 1px 3px oklch(0.255 0.012 60 / .14);
}

.dcard-pos-badge{
  display:inline-block; background:oklch(0.450 0.110 268 / .09); color:var(--indigo-d);
  font-weight:700; font-size:11.5px; border-radius:6px; padding:3px 9px;
}
.dcard-definition{ font-size:14px; line-height:1.85; color:var(--ink); margin:8px 0 0; }

.dcard-examples{ display:flex; flex-direction:column; gap:10px; }
.dcard-examples .ex-label{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.1em; color:var(--dim); text-transform:uppercase;
}
.dcard-example{ border-left:2px solid var(--line3); padding-left:12px; }
.dcard-example .ex-main{ font-family:var(--serif); font-size:15px; color:var(--ink); line-height:1.6; }
.dcard-example .ex-sub{ font-size:12.5px; color:var(--dim); margin-top:2px; }

.dcard-related{ display:flex; flex-direction:column; gap:8px; }
.dcard-related .rel-label{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.1em; color:var(--dim); text-transform:uppercase;
}
.dcard-related-grid{
  display:grid; grid-template-columns:repeat(auto-fill, minmax(160px, 1fr)); gap:9px;
}
.rel-card{
  border:1px solid var(--line3); border-radius:10px; padding:10px 12px; background:#fff;
  display:flex; flex-direction:column; gap:3px;
}
.rel-card .rc-word{ font-family:var(--serif); font-size:17px; color:var(--ink); display:flex; align-items:center; gap:6px; }
.rel-card .rc-pos{ font-size:10.5px; color:var(--indigo-d); font-weight:700; }
.rel-card .rc-usage{ font-size:11.5px; color:var(--dim); line-height:1.5; }

.dcard-sense-list{ display:flex; flex-direction:column; gap:6px; }
.dcard-sense-list .sense-label{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.1em; color:var(--dim); text-transform:uppercase;
}
.sense-row{ display:flex; gap:10px; align-items:baseline; font-size:13.5px; }
.sense-row .sr-char{ font-family:var(--serif); font-size:17px; color:var(--ink); flex:none; }
.sense-row .sr-text{ color:var(--mid); }

.dcard-formation{
  background:var(--tint); border:1px solid var(--line3); border-radius:10px;
  padding:12px 14px; font-size:13.5px; color:var(--mid); line-height:1.7;
}
.dcard-formation .fm-parts{ display:flex; align-items:center; gap:8px; margin-bottom:6px; }
.dcard-formation .fm-part{
  background:#fff; border:1px solid var(--line); color:var(--ink); border-radius:8px;
  padding:5px 10px; font-family:var(--serif); font-size:15px;
}
.dcard-formation .fm-rel{ color:var(--dim); font-size:13px; }

.dcard-block{ border-top:1px solid var(--line3); padding-top:16px; }
.dcard-block:first-child{ border-top:none; padding-top:0; }

@media (max-width:768px){
  .dcard{ padding:20px 18px; }
  .dcard-char[data-kind="char"]{ font-size:56px; }
  .dcard-char[data-kind="word"]{ font-size:40px; }
}

/* ==========================================================================
   Demo panel
   ========================================================================== */
.demo-panel{ background:var(--card); border:1px solid var(--line3); border-radius:18px; padding:36px; }
.demo-controls{ display:flex; gap:14px; margin-bottom:16px; flex-wrap:wrap; }
.demo-controls .field{ flex:1 1 320px; }
.demo-controls .go-btn{ flex:none; }
.demo-chips{ display:flex; gap:8px; flex-wrap:wrap; margin-bottom:20px; }
.demo-chip{
  border:1px solid var(--line); background:#fff; border-radius:8px; padding:6px 14px;
  font-family:var(--serif); font-size:16px; cursor:pointer; white-space:nowrap;
}
.demo-chip:hover{ border-color:var(--indigo); color:var(--indigo-d); }
.demo-density-row{ display:flex; align-items:center; gap:10px; margin-bottom:24px; }
.demo-density-row .label{ font-family:var(--mono); font-size:10.5px; letter-spacing:.13em; color:var(--dim); }
.demo-density-toggle{ display:flex; gap:8px; }
.demo-stage{ display:flex; justify-content:center; padding:8px 0; min-height:280px; }
.demo-note{ text-align:center; font-size:13px; color:var(--dim); margin-top:20px; }
.demo-note .dot{ display:inline-block; width:8px; height:8px; border-radius:50%; margin-right:5px; vertical-align:middle; }
.demo-note .dot.v{ background:var(--verm); }
.demo-note .dot.i{ background:var(--indigo); margin-left:12px; }

@media (max-width:768px){
  .demo-panel{ padding:22px 18px; border-radius:14px; }
  .demo-controls{ flex-direction:column; }
}

/* States: loading / empty / missing / error ---------------------------- */
.state-card{
  width:100%; max-width:440px; border-radius:16px; padding:30px 28px;
  display:flex; flex-direction:column; align-items:center; text-align:center; gap:10px;
}
.state-empty, .state-missing{ border:1.5px dashed var(--line); background:var(--tint); }
.state-error{ border:1px solid oklch(0.545 0.170 32 / .35); background:oklch(0.545 0.170 32 / .05); }
.state-title{ font-weight:700; font-size:15px; }
.state-desc{ font-size:13.5px; color:var(--mid); line-height:1.8; }
.state-error .state-title{ color:var(--red); }
.state-code{ font-family:var(--mono); font-size:11px; color:var(--dim); }
.state-missing .big{ font-family:var(--serif); font-size:56px; color:var(--dim); }

.skeleton-card{
  width:100%; max-width:440px; border-radius:16px; padding:30px 28px; background:var(--card);
  border:1px solid var(--line3); display:flex; flex-direction:column; gap:20px;
}
.sk-block{ background:oklch(0.940 0.008 85); border-radius:8px; }
.sk-title{ height:84px; width:60%; border-radius:12px; }
.sk-row{ height:96px; border-radius:12px; }
.sk-line{ height:14px; border-radius:6px; }
.sk-line.short{ width:40%; }

/* ==========================================================================
   Integration section
   ========================================================================== */
.integration-grid{ display:grid; grid-template-columns:1fr 1fr; gap:32px; }
.integration-card{ background:var(--card); border:1px solid var(--line3); border-radius:16px; padding:28px; }
.integration-card h3{ font-size:17px; margin:0 0 6px; }
.integration-card p.desc{ font-size:13.5px; color:var(--mid); margin:0 0 18px; }
.integration-card .docs-link{ display:inline-block; margin-top:16px; font-size:13.5px; font-weight:600; }
@media (max-width:1179px){ .integration-grid{ grid-template-columns:1fr; } }

/* ==========================================================================
   Pricing
   ========================================================================== */
.price-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.price-card{
  background:var(--card); border:1px solid var(--line3); border-radius:16px; padding:28px 24px;
  display:flex; flex-direction:column; gap:16px; position:relative;
}
.price-card.recommended{ border:2px solid var(--indigo); }
.price-badge{
  position:absolute; top:-13px; left:50%; transform:translateX(-50%);
  background:var(--indigo); color:#fff; font-size:11px; font-weight:700; padding:4px 12px;
  border-radius:999px; white-space:nowrap;
}
.price-card h3{ font-size:17px; margin:0; }
.price-card .amount{ font-family:var(--mono); font-size:30px; font-weight:600; }
.price-card .amount .unit{ font-size:13px; color:var(--dim); font-weight:400; }
.price-card .sub{ font-size:13px; color:var(--mid); margin:0; min-height:36px; }
.price-features{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:10px; flex:1; }
.price-features li{ font-size:13.5px; color:var(--mid); display:flex; gap:8px; }
.price-features li::before{ content:"✓"; color:var(--indigo); font-weight:700; flex:none; }
@media (max-width:1179px){ .price-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:768px){ .price-grid{ grid-template-columns:1fr; } }

/* ==========================================================================
   Docs page
   ========================================================================== */
.docs-layout{ display:grid; grid-template-columns:248px 1fr; gap:48px; align-items:start; }
.docs-sidebar{ position:sticky; top:90px; display:flex; flex-direction:column; gap:22px; }
.docs-group h4{ font-size:11px; text-transform:uppercase; letter-spacing:.08em; color:var(--dim); margin:0 0 8px; }
.docs-group a{ display:block; font-size:14px; color:var(--mid); padding:6px 0; border-left:2px solid transparent; padding-left:12px; margin-left:-13px; }
.docs-group a:hover{ color:var(--ink); }
.docs-group a.active{ color:var(--indigo-d); border-left-color:var(--indigo); font-weight:600; }
.docs-content{ max-width:820px; }
.docs-content h2{ font-family:var(--serif); font-size:26px; margin:44px 0 14px; scroll-margin-top:90px; }
.docs-content h2:first-child{ margin-top:0; }
.docs-content h3{ font-size:17px; margin:28px 0 10px; }
.docs-content p{ font-size:15px; line-height:1.85; color:var(--mid); margin:0 0 14px; }
.docs-content table{ width:100%; border-collapse:collapse; margin:16px 0 24px; font-size:13.5px; }
.docs-content th, .docs-content td{ text-align:left; padding:10px 12px; border-bottom:1px solid var(--line3); }
.docs-content th{ color:var(--dim); font-weight:600; font-size:12px; text-transform:uppercase; letter-spacing:.04em; }
.docs-content td code{ background:var(--tint); padding:1px 6px; border-radius:5px; font-size:12.5px; }
.docs-cta{ background:var(--tint); border:1px solid var(--line3); border-radius:14px; padding:22px 24px; margin:32px 0; display:flex; align-items:center; justify-content:space-between; gap:16px; flex-wrap:wrap; }
.docs-cta p{ margin:0; font-weight:600; color:var(--ink); font-size:14.5px; }
@media (max-width:1000px){
  .docs-layout{ grid-template-columns:1fr; }
  .docs-sidebar{ position:static; display:grid; grid-template-columns:repeat(2,1fr); gap:18px 24px; }
}

/* ==========================================================================
   Get API Key page
   ========================================================================== */
.key-layout{ display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:start; }
.step-list{ display:flex; flex-direction:column; gap:22px; }
.step-item{ display:flex; gap:16px; }
.step-num{
  flex:none; width:32px; height:32px; border-radius:50%; background:var(--tint);
  border:1px solid var(--line3); display:flex; align-items:center; justify-content:center;
  font-family:var(--mono); font-size:13px; color:var(--indigo-d); font-weight:600;
}
.step-body h4{ margin:0 0 4px; font-size:15px; }
.step-body p{ margin:0; font-size:13.5px; color:var(--mid); line-height:1.8; }
.key-form{ background:var(--card); border:1px solid var(--line3); border-radius:16px; padding:30px; display:flex; flex-direction:column; gap:18px; }
.key-quota{ background:var(--tint); border:1px solid var(--line3); border-radius:10px; padding:14px 16px; font-size:13px; color:var(--mid); }
.key-result{ display:none; flex-direction:column; gap:12px; }
.key-result.show{ display:flex; }
.key-result .code-block{ font-size:13px; }
@media (max-width:1000px){ .key-layout{ grid-template-columns:1fr; gap:36px; } }

/* ==========================================================================
   About page
   ========================================================================== */
.about-hero{ max-width:760px; }
.about-hero h1{ font-family:var(--serif); font-size:36px; margin:0 0 22px; }
.about-hero p{ font-size:15.5px; line-height:1.9; color:var(--mid); margin:0 0 18px; }
.principle-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:18px; margin-top:36px; }
.principle-card{ background:var(--card); border:1px solid var(--line3); border-radius:14px; padding:24px; font-size:14px; color:var(--ink); font-weight:600; line-height:1.6; }
@media (max-width:768px){ .principle-grid{ grid-template-columns:1fr; } }

/* ==========================================================================
   Page hero (inner pages)
   ========================================================================== */
.page-hero{ padding:56px 0 20px; }
.page-hero h1{ font-family:var(--serif); font-size:36px; margin:0 0 12px; }
.page-hero p{ color:var(--mid); font-size:15.5px; max-width:620px; margin:0; }
@media (max-width:768px){ .page-hero h1{ font-size:26px; } .page-hero{ padding:26px 0 14px; } }

.visually-hidden{ position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; }