/* ============================================================
   MiaoLiCi — shared design tokens & primitives
   Drives /, /docs, /about. Themes via [data-theme="dark|light"].
   ============================================================ */

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

:root,
[data-theme="dark"]{
  --bg:#0a0a0a;
  --bg-section:#0d0d0d;
  --bg-elev:#111;
  --card-bg:rgba(255,255,255,0.04);
  --card-bg-hover:rgba(255,255,255,0.06);
  --card-border:rgba(255,255,255,0.08);
  --card-border-hover:rgba(255,255,255,0.18);
  --text:#f0f0f0;
  --text-secondary:rgba(255,255,255,0.6);
  --text-tertiary:rgba(255,255,255,0.4);
  --orange:#f0902d;
  --orange-soft:rgba(240,144,45,0.12);
  --orange-glow:rgba(240,144,45,0.35);
  --accent:#e8a838;
  --gold:#e3c692;
  --green:#5ec27f;
  --glass:rgba(255,255,255,0.03);
  --glass-border:rgba(255,255,255,0.06);
  --nav-bg:rgba(15,15,15,0.7);
  --code-bg:rgba(0,0,0,0.45);
  --code-text:#d8d8d8;
  --shadow-cta:0 0 0 1px rgba(240,144,45,0.4),0 6px 20px rgba(240,144,45,0.3);
  --shadow-cta-hover:0 0 0 1px rgba(240,144,45,0.5),0 10px 28px rgba(240,144,45,0.4);
  --bg-grid-color:rgba(255,255,255,0.018);
  --canvas-opacity:0.65;
}

[data-theme="light"]{
  --bg:#fafaf8;
  --bg-section:#f4f1e8;
  --bg-elev:#ffffff;
  --card-bg:rgba(255,255,255,0.7);
  --card-bg-hover:#ffffff;
  --card-border:rgba(0,0,0,0.08);
  --card-border-hover:rgba(0,0,0,0.18);
  --text:#1a1a1a;
  --text-secondary:rgba(26,26,26,0.65);
  --text-tertiary:rgba(26,26,26,0.4);
  --orange:#d97712;
  --orange-soft:rgba(217,119,18,0.10);
  --orange-glow:rgba(217,119,18,0.25);
  --accent:#c98e2a;
  --gold:#a8895a;
  --green:#3e9c5f;
  --glass:rgba(0,0,0,0.02);
  --glass-border:rgba(0,0,0,0.06);
  --nav-bg:rgba(255,255,255,0.78);
  --code-bg:#1a1a1a;
  --code-text:#e0e0e0;
  --shadow-cta:0 0 0 1px rgba(217,119,18,0.35),0 6px 20px rgba(217,119,18,0.18);
  --shadow-cta-hover:0 0 0 1px rgba(217,119,18,0.5),0 10px 28px rgba(217,119,18,0.28);
  --bg-grid-color:rgba(0,0,0,0.04);
  --canvas-opacity:0.20;
}

:root{
  --radius-sm:12px;
  --radius:16px;
  --radius-lg:20px;
  --radius-xl:28px;
  --mono:'JetBrains Mono',Menlo,Consolas,monospace;
  --motion-fast:180ms cubic-bezier(0.4,0,0.2,1);
  --motion:300ms cubic-bezier(0.4,0,0.2,1);
}

html{scroll-behavior:smooth}
body{
  font-family:'Noto Sans SC',-apple-system,BlinkMacSystemFont,sans-serif;
  background:var(--bg);
  color:var(--text);
  min-height:100vh;
  overflow-x:hidden;
  position:relative;
  line-height:1.6;
  transition:background .35s ease,color .35s ease;
}

/* ===== Pixel mosaic background ===== */
.bg-canvas{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  opacity:var(--canvas-opacity);
  transition:opacity .35s ease;
}
.bg-glow{
  position:fixed;
  top:-200px;left:50%;transform:translateX(-50%);
  width:1200px;height:600px;
  background:radial-gradient(ellipse at center,var(--orange-glow) 0%,transparent 60%);
  z-index:0;pointer-events:none;
  opacity:0.7;
}

/* ===== Nav ===== */
.nav{
  position:fixed;top:12px;left:50%;transform:translateX(-50%);z-index:100;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:6px 10px 6px 18px;
  background:var(--nav-bg);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--glass-border);
  border-radius:999px;
  box-shadow:0 8px 32px rgba(0,0,0,0.4),inset 0 1px 0 rgba(255,255,255,0.05);
  width:min(1100px,calc(100vw - 24px));
}
.nav-brand{
  display:flex;align-items:center;gap:10px;
  font-weight:700;font-size:15px;letter-spacing:0.5px;
  color:var(--text);text-decoration:none;
  white-space:nowrap;
}
.nav-center{
  display:flex;align-items:center;gap:2px;
  flex:1;justify-content:center;
}
.nav-center a{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 14px;
  font-size:14px;font-weight:500;
  color:var(--text-secondary);
  border-radius:999px;
  text-decoration:none;
  transition:all var(--motion-fast);
}
.nav-center a:hover{color:var(--text);background:rgba(127,127,127,0.08);}
.nav-center a.active{color:var(--text);background:rgba(127,127,127,0.12);}
.nav-center a .icon{font-size:13px;opacity:0.75;}
.nav-right{display:flex;align-items:center;gap:4px;}
.nav-right .icon-btn{
  width:34px;height:34px;
  display:flex;align-items:center;justify-content:center;
  background:transparent;border:none;
  color:var(--text-secondary);
  border-radius:50%;cursor:pointer;
  transition:all var(--motion-fast);font-size:14px;
}
.nav-right .icon-btn:hover{background:rgba(127,127,127,0.12);color:var(--text);}
.nav-cta{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 18px;margin-left:6px;
  background:var(--orange);
  color:#0a0a0a;font-weight:700;font-size:13px;
  border-radius:999px;text-decoration:none;
  transition:transform var(--motion-fast),box-shadow var(--motion-fast);
  box-shadow:var(--shadow-cta);
}
.nav-cta:hover{transform:translateY(-1px);box-shadow:var(--shadow-cta-hover);}

/* ===== Content frame ===== */
.content{position:relative;z-index:1;padding-top:100px;}
.section{max-width:1180px;margin:0 auto;padding:80px 24px;}
.section-eyebrow{
  display:inline-block;
  padding:6px 14px;
  background:var(--orange-soft);
  border:1px solid var(--orange-glow);
  border-radius:999px;
  font-size:12px;font-weight:500;
  color:var(--orange);
  letter-spacing:0.5px;
  margin-bottom:20px;
}
.section-title{
  font-size:clamp(28px,3.4vw,42px);
  font-weight:800;line-height:1.2;
  margin-bottom:14px;letter-spacing:-0.02em;
}
.section-title .orange{color:var(--orange);}
.section-sub{
  font-size:17px;color:var(--text-secondary);
  max-width:620px;margin-bottom:48px;
}
.section-header.centered{text-align:center;}
.section-header.centered .section-sub{margin-left:auto;margin-right:auto;}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 28px;
  border-radius:999px;
  font-size:15px;font-weight:600;
  text-decoration:none;
  transition:transform var(--motion-fast),box-shadow var(--motion-fast),background var(--motion-fast),border-color var(--motion-fast);
  cursor:pointer;border:none;
  font-family:inherit;
}
.btn-primary{
  background:var(--orange);
  color:#0a0a0a;
  box-shadow:var(--shadow-cta);
}
.btn-primary:hover{transform:translateY(-1px);box-shadow:var(--shadow-cta-hover);}
.btn-secondary{
  background:var(--card-bg);
  color:var(--text);
  border:1px solid var(--card-border);
}
.btn-secondary:hover{background:var(--card-bg-hover);border-color:var(--card-border-hover);}

/* ===== Card primitive ===== */
.card{
  background:var(--card-bg);
  border:1px solid var(--card-border);
  border-radius:var(--radius-lg);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  transition:border-color var(--motion-fast),background var(--motion-fast),transform var(--motion-fast);
}
.card:hover{border-color:var(--card-border-hover);background:var(--card-bg-hover);}

/* ===== Code blocks ===== */
.code-card{
  background:var(--code-bg);
  border:1px solid var(--card-border);
  border-radius:var(--radius-lg);
  overflow:hidden;
}
.code-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 16px;
  background:rgba(127,127,127,0.06);
  border-bottom:1px solid var(--card-border);
}
.code-lang{font-family:var(--mono);font-size:12px;font-weight:500;color:var(--text-secondary);}
.code-dots{display:flex;gap:6px;}
.code-dots span{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,0.12);}
.code-dots span:nth-child(1){background:#ff5f57;}
.code-dots span:nth-child(2){background:#febc2e;}
.code-dots span:nth-child(3){background:#28c840;}
.code-card pre{
  padding:20px;
  font-family:var(--mono);font-size:13px;line-height:1.7;
  color:var(--code-text);
  overflow-x:auto;white-space:pre;
}
.tok-key{color:#e8a838;}
.tok-str{color:#7fc97f;}
.tok-fn{color:#f0902d;}
.tok-com{color:#888;font-style:italic;}
.tok-kw{color:#c678dd;}

/* ===== Footer ===== */
.footer{
  position:relative;z-index:1;
  border-top:1px solid var(--glass-border);
  background:var(--bg-section);
  margin-top:40px;
}
.footer-inner{
  max-width:1180px;margin:0 auto;
  padding:56px 24px 28px;
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:40px;
}
.footer-brand p{
  font-size:14px;color:var(--text-secondary);
  margin-top:14px;max-width:300px;
}
.footer-col h5{
  font-size:13px;font-weight:600;
  color:var(--text-tertiary);
  text-transform:uppercase;letter-spacing:0.08em;
  margin-bottom:16px;
}
.footer-col a{
  display:block;font-size:14px;
  color:var(--text-secondary);
  text-decoration:none;
  padding:5px 0;
  transition:color var(--motion-fast);
}
.footer-col a:hover{color:var(--text);}
.footer-bottom{
  max-width:1180px;margin:0 auto;
  padding:20px 24px;
  border-top:1px solid var(--glass-border);
  display:flex;justify-content:space-between;align-items:center;
  flex-wrap:wrap;gap:12px;
  font-size:12px;color:var(--text-tertiary);
}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .footer-inner{grid-template-columns:1fr 1fr;}
}
@media(max-width:768px){
  .nav-center{display:none;}
  .nav-cta span:not(:first-child){display:none;}
  .footer-inner{grid-template-columns:1fr;}
  .section{padding:64px 18px;}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;}
}

/* ===== Lang picker ===== */
.lang-wrap{position:relative;display:inline-flex;}
.lang-btn{
  width:auto;min-width:34px;padding:0 10px;
  font-family:var(--mono);font-size:12px;font-weight:600;
  letter-spacing:0.04em;
}
.lang-dropdown{
  position:absolute;top:calc(100% + 8px);right:0;
  min-width:140px;
  padding:6px;
  background:var(--nav-bg);
  border:1px solid var(--card-border);
  border-radius:14px;
  box-shadow:0 12px 32px rgba(0,0,0,0.35);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  opacity:0;visibility:hidden;
  transform:translateY(-4px);
  transition:opacity var(--motion-fast),transform var(--motion-fast),visibility var(--motion-fast);
  z-index:200;
}
.lang-dropdown.open{
  opacity:1;visibility:visible;transform:translateY(0);
}
.lang-dropdown a{
  display:flex;align-items:center;gap:8px;
  padding:8px 12px;
  border-radius:8px;
  font-size:13px;font-weight:500;
  color:var(--text-secondary);
  text-decoration:none;
  transition:all var(--motion-fast);
}
.lang-dropdown a:hover{color:var(--text);background:rgba(127,127,127,0.08);}
.lang-dropdown a.active{color:var(--orange);background:var(--orange-soft);}
.lang-dropdown a .glyph{
  font-family:var(--mono);font-size:11px;
  width:28px;text-align:center;
  color:var(--text-tertiary);
}
.lang-dropdown a.active .glyph{color:var(--orange);}