/* ==========================================================================
   DCX 官网样式表
   设计基线：Windows 11 Fluent（胶囊圆角、克制阴影、深青强调色）
   主题：:root = 浅色；html[data-theme="dark"] = 深色
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  color-scheme: light;

  --font: "Segoe UI Variable Display", "Segoe UI", "PingFang SC",
    "Microsoft YaHei UI", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: "Cascadia Code", "Cascadia Mono", ui-monospace, Consolas, "SF Mono",
    Menlo, "Liberation Mono", monospace;

  --wrap: 1160px;
  --header-h: 66px;

  --bg: #f4f7f7;
  --bg-soft: #edf2f2;
  --surface: #ffffff;
  --surface-2: #f8fbfb;
  --surface-3: #eef4f4;
  --line: #e2e9e9;
  --line-strong: #cfdad9;

  --ink: #0e191a;
  --ink-2: #4a5b5d;
  --ink-3: #5f7274;

  --accent: #0e7c7e;
  --accent-strong: #0a6e72;
  --accent-ink: #065355;
  --accent-soft: #e4f2f1;
  --accent-line: #bcdedc;
  --on-accent: #ffffff;

  --code-bg: #0f191a;
  --code-bg-2: #142022;
  --code-ink: #dbe7e6;
  --code-dim: #8ba0a0;
  --code-line: #243335;

  --shadow-1: 0 1px 2px rgba(9, 26, 27, 0.05);
  --shadow-2: 0 2px 4px rgba(9, 26, 27, 0.04), 0 20px 44px -22px rgba(9, 26, 27, 0.28);
  --shadow-3: 0 30px 70px -30px rgba(9, 26, 27, 0.35);

  --ring: 0 0 0 3px rgba(14, 124, 126, 0.22);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

html[data-theme="dark"] {
  color-scheme: dark;

  --bg: #0a1011;
  --bg-soft: #0c1314;
  --surface: #121a1b;
  --surface-2: #162021;
  --surface-3: #1a2526;
  --line: #223132;
  --line-strong: #2e4042;

  --ink: #e8f0ef;
  --ink-2: #a5b6b5;
  --ink-3: #7b8e8d;

  --accent: #4fd8cc;
  --accent-strong: #77e6db;
  --accent-ink: #8fe9e0;
  --accent-soft: #0f2a2a;
  --accent-line: #1f4444;
  --on-accent: #062c2c;

  --code-bg: #070d0e;
  --code-bg-2: #0c1415;
  --code-ink: #d5e3e2;
  --code-dim: #7f9494;
  --code-line: #1d2b2c;

  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-2: 0 2px 6px rgba(0, 0, 0, 0.35), 0 24px 50px -24px rgba(0, 0, 0, 0.8);
  --shadow-3: 0 34px 80px -34px rgba(0, 0, 0, 0.85);

  --ring: 0 0 0 3px rgba(79, 216, 204, 0.22);
}

/* JS 未执行时的系统主题兜底 */
@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    color-scheme: dark;
    --bg: #0a1011;
    --bg-soft: #0c1314;
    --surface: #121a1b;
    --surface-2: #162021;
    --line: #223132;
    --line-strong: #2e4042;
    --ink: #e8f0ef;
    --ink-2: #a5b6b5;
    --ink-3: #7b8e8d;
    --accent: #4fd8cc;
    --accent-strong: #77e6db;
    --accent-ink: #8fe9e0;
    --accent-soft: #0f2a2a;
    --accent-line: #1f4444;
    --on-accent: #062c2c;
    --code-bg: #070d0e;
    --code-bg-2: #0c1415;
    --code-ink: #d5e3e2;
    --code-dim: #7f9494;
    --code-line: #1d2b2c;
    --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-2: 0 2px 6px rgba(0, 0, 0, 0.35), 0 24px 50px -24px rgba(0, 0, 0, 0.8);
    --shadow-3: 0 34px 80px -34px rgba(0, 0, 0, 0.85);
  }
}

/* ---------- 2. Reset & base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15.5px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 650;
  letter-spacing: -0.018em;
  line-height: 1.22;
  text-wrap: balance;
}

p { margin: 0; }

a {
  color: inherit;
  text-decoration: none;
}

img, svg { display: block; max-width: 100%; }

button, input, select {
  font: inherit;
  color: inherit;
}

button { cursor: pointer; }

::selection {
  background: var(--accent);
  color: var(--on-accent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

code, kbd, pre {
  font-family: var(--mono);
  font-size: 0.92em;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-2);
  transform: translateY(-160%);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus { transform: none; }

/* ---------- 3. Layout ---------- */
.wrap {
  width: min(var(--wrap), calc(100% - 48px));
  margin-inline: auto;
}

.section {
  position: relative;
  padding: 92px 0;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.section + .section { border-top: 0; }
.section + .section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(var(--wrap), calc(100% - 36px));
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line) 8%, var(--line) 92%, transparent);
}

.section-head {
  max-width: 720px;
  margin-bottom: 40px;
}

.kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-ink);
}
.kicker::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--accent);
  flex: none;
}

.section-head h2 {
  font-size: clamp(26px, 3.1vw, 36px);
  letter-spacing: -0.026em;
}

.section-head .lede {
  margin-top: 14px;
  color: var(--ink-2);
  font-size: 15.5px;
  line-height: 1.8;
  text-wrap: pretty;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

/* ---------- 4. Buttons / pills / misc ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.005em;
  white-space: nowrap;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease),
    transform 0.18s var(--ease), box-shadow 0.18s var(--ease), color 0.18s var(--ease);
}
.btn svg { flex: none; }

.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12), 0 10px 24px -14px var(--accent);
}
.btn-primary:hover {
  background: var(--accent-strong);
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.12), 0 16px 30px -16px var(--accent);
}
.btn-primary:active { transform: none; }

.btn-ghost {
  background: var(--surface);
  border-color: var(--line-strong);
  color: var(--ink);
  box-shadow: var(--shadow-1);
}
.btn-ghost:hover {
  border-color: var(--accent-line);
  background: var(--accent-soft);
  color: var(--accent-ink);
}

.btn-sm { height: 36px; padding: 0 14px; font-size: 13.5px; border-radius: 8px; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--ink-2);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}
.pill-accent {
  border-color: var(--accent-line);
  background: var(--accent-soft);
  color: var(--accent-ink);
}

kbd {
  display: inline-block;
  padding: 2px 6px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--surface-2);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.5;
  white-space: nowrap;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0;
  margin: 0;
  list-style: none;
}
.tag-list li {
  padding: 3px 9px;
  border-radius: 6px;
  background: var(--surface-3);
  color: var(--ink-2);
  font-size: 12px;
  line-height: 1.7;
}

/* 阅读进度 */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 200;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.08s linear;
  pointer-events: none;
}

/* ---------- 5. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: blur(18px) saturate(1.5);
  backdrop-filter: blur(18px) saturate(1.5);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
@supports not (background: color-mix(in srgb, red 50%, blue)) {
  .site-header { background: var(--bg); }
}
.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  width: min(var(--wrap), calc(100% - 48px));
  height: 100%;
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: none;
}
.brand img {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  box-shadow: 0 2px 6px rgba(4, 54, 63, 0.24);
}
.brand-name {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.16em;
}
.brand-ver {
  margin-left: 2px;
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--ink-3);
  font-size: 10.5px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 6px;
}
.site-nav a {
  position: relative;
  padding: 8px 12px;
  border-radius: 7px;
  color: var(--ink-2);
  font-size: 14px;
  transition: color 0.16s var(--ease), background 0.16s var(--ease);
}
.site-nav a:hover { color: var(--ink); background: var(--surface-2); }
.site-nav a.is-active { color: var(--accent-ink); font-weight: 600; }
.site-nav a.is-active::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  border-radius: 1px;
  background: var(--accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--ink-2);
  background: transparent;
  transition: background 0.16s var(--ease), color 0.16s var(--ease),
    border-color 0.16s var(--ease);
}
.icon-btn:hover {
  background: var(--surface);
  border-color: var(--line);
  color: var(--ink);
}

.theme-toggle {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink-2);
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease),
    background 0.16s var(--ease);
}
.theme-toggle:hover { color: var(--accent-ink); border-color: var(--accent-line); }
.theme-toggle .i-sun,
.theme-toggle .i-moon {
  position: absolute;
  transition: opacity 0.2s var(--ease), transform 0.35s var(--ease);
}
.theme-toggle .i-sun { opacity: 0; transform: rotate(40deg) scale(0.6); }
.theme-toggle .i-moon { opacity: 1; transform: rotate(0) scale(1); }
html[data-theme="dark"] .theme-toggle .i-sun { opacity: 1; transform: rotate(0) scale(1); }
html[data-theme="dark"] .theme-toggle .i-moon { opacity: 0; transform: rotate(-40deg) scale(0.6); }

.menu-toggle { display: none; }

/* 移动端抽屉 */
.mobile-nav {
  position: fixed;
  inset: var(--header-h) 0 auto 0;
  z-index: 99;
  display: none;
  padding: 10px 24px 22px;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  box-shadow: var(--shadow-2);
}
.mobile-nav.is-open { display: block; }
.mobile-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 4px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-2);
  font-size: 15px;
}
.mobile-nav a:last-child { border-bottom: 0; }
.mobile-nav a.is-active { color: var(--accent-ink); font-weight: 600; }

/* ---------- 6. Hero ---------- */
.hero {
  position: relative;
  padding: 46px 0 72px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -28% -10% auto -10%;
  height: 780px;
  background:
    radial-gradient(44% 58% at 14% 18%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 70%),
    radial-gradient(38% 50% at 86% 2%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 72%);
  pointer-events: none;
}
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.38;
  -webkit-mask-image: radial-gradient(74% 62% at 50% 0%, #000 8%, transparent 78%);
  mask-image: radial-gradient(74% 62% at 50% 0%, #000 8%, transparent 78%);
  pointer-events: none;
}
html[data-theme="dark"] .hero-grid-bg { opacity: 0.16; }

.hero-top {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  gap: 56px;
  align-items: center;
}
.hero h1 {
  margin: 18px 0 0;
  font-size: clamp(32px, 3.4vw, 42px);
  font-weight: 680;
  letter-spacing: -0.028em;
  line-height: 1.12;
}
.hero h1 .hl {
  background: linear-gradient(transparent 64%, var(--accent-soft) 64%, var(--accent-soft) 96%, transparent 96%);
  padding-bottom: 2px;
}
html[data-theme="dark"] .hero h1 .hl {
  background: linear-gradient(transparent 64%, rgba(79, 216, 204, 0.16) 64%, rgba(79, 216, 204, 0.16) 96%, transparent 96%);
}
.hero .lede {
  max-width: 33em;
  margin-top: 18px;
  color: var(--ink-2);
  font-size: 16px;
  line-height: 1.82;
  text-wrap: pretty;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  color: var(--ink-3);
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
}
.hero-meta li { display: inline-flex; align-items: center; gap: 7px; }
.hero-meta li::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--line-strong);
}
.hero-meta li:first-child::before { background: var(--accent); }

/* 热键卡 */
.hotkeys {
  position: relative;
  padding: 20px 22px 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  box-shadow: var(--shadow-2);
  overflow: hidden;
}
.hotkeys::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent 72%);
  opacity: 0.7;
}
.hotkeys-head {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--ink-3);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.hk-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
  flex: none;
}
.hk-note {
  margin-left: auto;
  color: var(--ink-3);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: none;
}
.hotkeys ul {
  display: grid;
  gap: 0;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}
.hotkeys li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid var(--line);
}
.hotkeys li:first-child { border-top: 0; padding-top: 2px; }
.keys {
  display: flex;
  align-items: center;
  gap: 3px;
  min-width: 86px;
  flex: none;
}
.keys i {
  font-style: normal;
  color: var(--ink-3);
  font-size: 10px;
}
.keys kbd { font-size: 10.5px; padding: 2px 5px; }
.hk-label { color: var(--ink); font-size: 13.5px; }
.hk-idx {
  margin-left: auto;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}
.hotkeys-foot {
  margin: 14px 0 0;
  padding-top: 13px;
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 11px;
  line-height: 1.6;
}

/* 首屏实机大图 */
.hero-shot {
  position: relative;
  margin: 42px 0 0;
}
.hero-shot-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-3);
}
.hero-shot-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 4;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
  pointer-events: none;
}
.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s var(--ease);
}
.hero-slide.is-active {
  opacity: 1;
  z-index: 1;
}
.hero-slide img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.018);
  transition: transform 7s linear;
}
.hero-slide.is-active img { transform: scale(1); }

.hero-controls {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 1px;
  padding: 4px 7px 4px 5px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  background: rgba(10, 18, 19, 0.42);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  backdrop-filter: blur(14px) saturate(1.2);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
}
.hero-dot {
  position: relative;
  width: 20px;
  height: 22px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}
.hero-dot::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 5px;
  height: 5px;
  border-radius: 3px;
  transform: translate(-50%, -50%);
  background: rgba(255, 255, 255, 0.5);
  transition: width 0.25s var(--ease), background 0.25s var(--ease);
}
.hero-dot:hover::after { background: rgba(255, 255, 255, 0.82); }
.hero-dot.is-active::after { width: 15px; background: #fff; }
.hero-play {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  margin-left: 2px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: none;
  color: rgba(255, 255, 255, 0.82);
  cursor: pointer;
}
.hero-play:hover { color: #fff; background: rgba(255, 255, 255, 0.12); }
.hero-play svg { width: 10px; height: 10px; }
.hero-play .i-play { display: none; }
.hero-shot[data-paused="true"] .hero-play .i-play { display: block; }
.hero-shot[data-paused="true"] .hero-play .i-pause { display: none; }
.hero-shot-cap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 12px 0 0;
  padding-inline: 2px;
  color: var(--ink-3);
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
}

/* 通用截图 */
.shot {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-2);
}
.shot img {
  width: 100%;
  height: auto;
  display: block;
}
.shot-cap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 10px 0 0;
  padding-inline: 2px;
  color: var(--ink-3);
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
}

/* ---------- 7. Module bar ---------- */
.module-bar {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
}
.module-bar .wrap {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.module-bar a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 22px 22px 22px 0;
  transition: background 0.18s var(--ease);
}
.module-bar a + a {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}
.module-bar a:hover { background: var(--surface); }
.module-bar .mb-icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  flex: none;
  border-radius: 9px;
  background: var(--accent-soft);
  color: var(--accent-ink);
}
.module-bar .mb-text { min-width: 0; }
.module-bar .mb-title {
  display: block;
  font-size: 14px;
  font-weight: 600;
}
.module-bar .mb-sub {
  display: block;
  color: var(--ink-3);
  font-size: 11.5px;
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.module-bar .mb-arrow {
  margin-left: auto;
  color: var(--ink-3);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease);
}
.module-bar a:hover .mb-arrow { opacity: 1; transform: none; color: var(--accent); }

/* ---------- 8. Feature cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.card {
  position: relative;
  padding: 30px 30px 26px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  box-shadow: var(--shadow-1);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease),
    box-shadow 0.2s var(--ease);
}
.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  border-radius: 16px 16px 0 0;
  background: linear-gradient(90deg, var(--accent), transparent 70%);
  opacity: 0;
  transition: opacity 0.2s var(--ease);
}
.card:hover::before { opacity: 0.85; }
.card:hover {
  border-color: var(--accent-line);
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
}
.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}
.card-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 11px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  border: 1px solid color-mix(in srgb, var(--accent) 14%, transparent);
}
.card-num {
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
}
.card h3 {
  margin-top: 18px;
  font-size: 20px;
  letter-spacing: -0.02em;
}
.card > p {
  margin-top: 10px;
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.78;
  text-wrap: pretty;
}
.card .tag-list { margin-top: 16px; }
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  color: var(--accent-ink);
  font-size: 13px;
  font-weight: 600;
}
.card-link svg { transition: transform 0.18s var(--ease); }
.card-link:hover svg { transform: translateX(3px); }

/* ---------- 9. Module detail ---------- */
.module {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.06fr);
  gap: 64px;
  align-items: center;
  padding: 0;
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.module.flip .module-text { order: 2; }
.module.flip .module-media { order: 1; }

.module-label {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.module-label b {
  color: var(--accent-ink);
  font-weight: 600;
  letter-spacing: 0.14em;
}
.module-label i {
  width: 24px;
  height: 1px;
  background: var(--line-strong);
  font-style: normal;
}
.module h2 {
  margin-top: 13px;
  font-size: clamp(25px, 2.6vw, 31px);
  line-height: 1.24;
}
.module-text > p {
  margin-top: 13px;
  color: var(--ink-2);
  font-size: 15.5px;
  line-height: 1.75;
  text-wrap: pretty;
}
.facts {
  display: grid;
  gap: 11px;
  margin: 21px 0 0;
  padding: 0;
  list-style: none;
}
.facts li {
  display: flex;
  gap: 11px;
  color: var(--ink-2);
  font-size: 14.5px;
  line-height: 1.62;
}
.facts .fi {
  flex: none;
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  margin-top: 1px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent-ink);
}
.facts strong { color: var(--ink); font-weight: 600; }
.module-text .btn { margin-top: 22px; }

.module-media { min-width: 0; }
.shot-strip { margin-top: 14px; border-radius: 10px; box-shadow: var(--shadow-1); }

/* ---------- 10. Dock demo ---------- */
.demo {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow-2);
  overflow: hidden;
}
.demo-stage {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 176px;
  padding: 24px 22px;
  background:
    radial-gradient(120% 90% at 20% 0%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 60%),
    linear-gradient(160deg, var(--surface-3), var(--surface-2));
  overflow: hidden;
}
.demo-stage::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--line-strong) 0.7px, transparent 0.7px);
  background-size: 18px 18px;
  opacity: 0.35;
  pointer-events: none;
}
.dock {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: calc(var(--demo-gap, 0px) + 6px);
  padding: 9px 13px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 76%, transparent);
  border: 1px solid color-mix(in srgb, #ffffff 42%, transparent);
  box-shadow: 0 12px 30px -12px rgba(8, 30, 32, 0.38),
    inset 0 0 0 1px rgba(255, 255, 255, 0.22);
  -webkit-backdrop-filter: blur(14px) saturate(1.3);
  backdrop-filter: blur(14px) saturate(1.3);
  transition: border-radius 0.3s var(--ease), gap 0.18s var(--ease);
  max-width: 100%;
}
html[data-theme="dark"] .dock {
  background: color-mix(in srgb, #1b2627 82%, transparent);
  border-color: rgba(255, 255, 255, 0.09);
}
.dock[data-shape="card"] { border-radius: 12px; }

.tile {
  position: relative;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  flex: none;
  border-radius: 8px;
  color: #fff;
  transform: scale(var(--demo-scale, 1));
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
}
.dock[data-hover="dock"] .tile:hover {
  transform: scale(calc(var(--demo-scale, 1) * 1.22)) translateY(-2px);
  box-shadow: 0 8px 18px -6px rgba(0, 0, 0, 0.45);
}
.dock[data-hover="dock"]:hover .tile:hover ~ .tile { transform: scale(calc(var(--demo-scale, 1) * 1.1)); }
.tile svg { width: 16px; height: 16px; }
.tile.t1 { background: linear-gradient(145deg, #3d8bfd, #1b5fd0); }
.tile.t2 { background: linear-gradient(145deg, #ff8a5c, #e2532c); }
.tile.t3 { background: linear-gradient(145deg, #6f7bf7, #4436c9); }
.tile.t4 { background: linear-gradient(145deg, #2fb6a4, #087f78); }
.tile.t5 { background: linear-gradient(145deg, #f0b64d, #cf8a12); }
.tile.t6 { background: linear-gradient(145deg, #ef6a8b, #c02b52); }
.tile.t7 { background: linear-gradient(145deg, #8a97a5, #4d5a67); }
.tile.t8 { background: linear-gradient(145deg, #59c36a, #2c8a3a); }
.tile .dot {
  position: absolute;
  bottom: -4px;
  left: 50%;
  width: 4px;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
  opacity: 0.8;
  transform: translateX(-50%);
  display: none;
}

.demo-tray {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 12px;
  padding-left: 14px;
  border-left: 1px solid color-mix(in srgb, var(--ink) 12%, transparent);
  color: var(--ink-2);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}
.demo-tray svg { width: 13px; height: 13px; opacity: 0.75; }

.demo-controls {
  display: grid;
  gap: 0;
  padding: 4px 22px 18px;
  border-top: 1px solid var(--line);
}
.demo-row {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 13px 0;
  border-top: 1px solid var(--line);
  font-size: 13px;
}
.demo-row:first-child { border-top: 0; }
.demo-row > label {
  width: 84px;
  flex: none;
  color: var(--ink-2);
}
.demo-row output {
  width: 62px;
  flex: none;
  text-align: right;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
.demo-hint {
  padding: 12px 22px 16px;
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 11.5px;
  line-height: 1.6;
  background: var(--surface-2);
}

.segmented {
  display: inline-flex;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
}
.segmented button {
  padding: 5px 13px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--ink-2);
  font-size: 12.5px;
  transition: background 0.16s var(--ease), color 0.16s var(--ease),
    box-shadow 0.16s var(--ease);
}
.segmented button[aria-pressed="true"] {
  background: var(--surface);
  color: var(--accent-ink);
  font-weight: 600;
  box-shadow: var(--shadow-1);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 4px;
  border-radius: 2px;
  background: var(--line-strong);
  outline-offset: 6px;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--surface);
  box-shadow: 0 0 0 1px var(--accent), 0 2px 6px rgba(0, 0, 0, 0.2);
  cursor: grab;
}
input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--surface);
  box-shadow: 0 0 0 1px var(--accent);
}

/* ---------- 11. Flow ---------- */
.flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 10px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-2);
}
.flow-node {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  text-align: center;
}
.flow-node strong {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
}
.flow-node span {
  display: block;
  margin-top: 3px;
  color: var(--ink-3);
  font-size: 11px;
  line-height: 1.5;
}
.flow-node.accent {
  border-color: var(--accent-line);
  background: var(--accent-soft);
}
.flow-node.accent strong { color: var(--accent-ink); }
.flow-arrow {
  color: var(--accent);
  opacity: 0.7;
}
.flow-wide {
  margin-top: 36px;
  padding: 20px 26px;
}
.flow-wide .flow-node { padding: 17px 16px; }
.flow-wide .flow-node strong { font-size: 14px; }
.flow-wide .flow-node span { font-size: 11.5px; }

/* ---------- 12. Reminder explainer ---------- */
.axis {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}
.axis-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.axis-row > span:first-child {
  width: 64px;
  flex: none;
  color: var(--ink-3);
  font-size: 12px;
}
.axis-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.axis-chips span {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink-2);
  font-size: 12px;
}
.axis-chips span.on {
  border-color: var(--accent-line);
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-weight: 600;
}
.example-line {
  margin-top: 18px;
  padding: 14px 16px;
  border-left: 2px solid var(--accent);
  border-radius: 0 8px 8px 0;
  background: var(--surface-2);
  font-size: 13px;
  color: var(--ink-2);
}
.example-line code {
  color: var(--ink);
  font-size: 12.5px;
  word-break: break-word;
}
.example-line b { color: var(--accent-ink); }

/* ---------- 13. Architecture ---------- */
.arch {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background:
    radial-gradient(80% 100% at 100% 0%, color-mix(in srgb, var(--accent) 6%, transparent), transparent 60%),
    var(--surface);
  box-shadow: var(--shadow-1);
  overflow-x: auto;
}
.arch svg {
  width: 100%;
  min-width: 720px;
  height: auto;
}
.dg-box {
  fill: var(--surface-2);
  stroke: var(--line-strong);
  stroke-width: 1.2;
}
.dg-box-accent {
  fill: var(--accent-soft);
  stroke: var(--accent-line);
}
.dg-title {
  fill: var(--ink);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.dg-sub {
  fill: var(--ink-3);
  font-family: var(--font);
  font-size: 11px;
}
.dg-label {
  fill: var(--ink-3);
  font-family: var(--font);
  font-size: 10.5px;
  letter-spacing: 0.02em;
}
.dg-arrow {
  stroke: var(--accent);
  stroke-width: 1.2;
  fill: none;
  opacity: 0.75;
}
.dg-head {
  fill: var(--accent);
  opacity: 0.85;
}
.dg-bus {
  stroke: var(--line-strong);
  stroke-width: 1.2;
  stroke-dasharray: 4 4;
  fill: none;
}
.arch-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 16px;
  color: var(--ink-3);
  font-size: 12px;
}
.arch-legend span { display: inline-flex; align-items: center; gap: 7px; }
.arch-legend i {
  width: 14px;
  height: 2px;
  border-radius: 1px;
  background: var(--accent);
  font-style: normal;
}
.arch-legend i.dashed {
  background: repeating-linear-gradient(90deg, var(--line-strong) 0 4px, transparent 4px 8px);
}

/* ---------- 14. Download ---------- */
.download-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 48px;
  row-gap: 26px;
  padding: 44px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background:
    radial-gradient(70% 90% at 8% 0%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 62%),
    var(--surface);
  box-shadow: var(--shadow-2);
  overflow: hidden;
}
.download-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(var(--accent), transparent 80%);
  opacity: 0.7;
}
.download-card h2 { font-size: clamp(24px, 2.6vw, 30px); }
.download-card .lede {
  margin-top: 12px;
  color: var(--ink-2);
  font-size: 14.5px;
  line-height: 1.8;
}
.dl-files {
  display: grid;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}
.dl-files li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface-2);
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-2);
}
.dl-files svg { color: var(--accent); flex: none; }
.dl-files .sz {
  margin-left: auto;
  color: var(--ink-3);
  font-size: 11px;
  white-space: nowrap;
}

.dl-note { grid-column: 1 / -1; margin-top: 0; }

.steps {
  counter-reset: step;
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.steps > li {
  position: relative;
  counter-increment: step;
  padding-left: 40px;
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.7;
}
.steps > li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 1px solid var(--accent-line);
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-family: var(--mono);
  font-size: 11px;
}
.steps strong { color: var(--ink); font-weight: 600; }
.steps code {
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--surface-3);
  font-size: 12px;
}

/* 版本徽标 */
.ver {
  display: inline-flex;
  align-items: center;
  margin-left: 10px;
  padding: 3px 8px;
  border: 1px solid var(--accent-line);
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  vertical-align: middle;
}

/* ---------- 15. Limits ---------- */
.limits {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.limit {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
.limit h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  letter-spacing: 0;
}
.limit h3 svg { color: var(--ink-3); flex: none; }
.limit p {
  margin-top: 8px;
  color: var(--ink-2);
  font-size: 13px;
  line-height: 1.72;
}

/* ---------- 16. Footer ---------- */
.site-footer {
  position: relative;
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 56px 0 28px;
  overflow: hidden;
}
.site-footer .wrap { position: relative; z-index: 1; }
.footer-mark {
  position: absolute;
  right: -12px;
  bottom: -46px;
  color: var(--ink);
  font-size: clamp(120px, 17vw, 230px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 0.8;
  opacity: 0.035;
  pointer-events: none;
  user-select: none;
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 0.8fr));
  gap: 40px;
}
.footer-brand .brand { margin-bottom: 14px; }
.footer-brand p {
  max-width: 30ch;
  color: var(--ink-2);
  font-size: 13px;
  line-height: 1.75;
}
.footer-brand .pill { margin-top: 14px; }
.footer-col h3 {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.footer-col ul {
  display: grid;
  gap: 9px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}
.footer-col a {
  color: var(--ink-2);
  font-size: 13px;
  transition: color 0.16s var(--ease);
}
.footer-col a:hover { color: var(--accent-ink); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 44px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 11.5px;
}
.footer-bottom .dot-sep { opacity: 0.5; }

/* ---------- 17. Doc shell ---------- */
.doc-hero {
  position: relative;
  padding: 52px 0 30px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(60% 120% at 12% 0%, color-mix(in srgb, var(--accent) 9%, transparent), transparent 65%);
  overflow: hidden;
}
.doc-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.4;
  -webkit-mask-image: radial-gradient(58% 110% at 18% 0%, #000 5%, transparent 76%);
  mask-image: radial-gradient(58% 110% at 18% 0%, #000 5%, transparent 76%);
  pointer-events: none;
}
.doc-hero .wrap { position: relative; z-index: 1; }
html[data-theme="dark"] .doc-hero::after { opacity: 0.26; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-3);
  font-size: 12px;
}
.breadcrumb a:hover { color: var(--accent-ink); }
.breadcrumb svg { opacity: 0.5; }
.doc-hero h1 {
  margin-top: 16px;
  font-size: clamp(30px, 3.6vw, 42px);
  letter-spacing: -0.03em;
}
.doc-hero .lede {
  max-width: 62ch;
  margin-top: 12px;
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.8;
}
.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.doc-shell {
  display: grid;
  grid-template-columns: 244px minmax(0, 1fr);
  gap: 56px;
  padding: 44px 0 92px;
  align-items: start;
}

.doc-side {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  max-height: calc(100vh - var(--header-h) - 48px);
  overflow-y: auto;
  padding-right: 8px;
  scrollbar-width: thin;
}
.doc-side::-webkit-scrollbar { width: 6px; }
.doc-side::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 3px;
}
.side-toggle {
  display: none;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  color: var(--ink);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.side-toggle svg { color: var(--ink-3); transition: transform 0.2s var(--ease); }
.doc-side.is-collapsed .side-toggle svg { transform: rotate(-90deg); }

.side-title {
  margin-bottom: 14px;
  color: var(--ink-3);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.side-group + .side-group { margin-top: 22px; }
.side-group h3 {
  margin-bottom: 8px;
  color: var(--ink-3);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
}
.side-nav { display: grid; gap: 1px; }
.side-nav a {
  position: relative;
  padding: 6px 10px 6px 12px;
  border-radius: 6px;
  color: var(--ink-2);
  font-size: 13px;
  line-height: 1.5;
  transition: color 0.15s var(--ease), background 0.15s var(--ease);
}
.side-nav a:hover { background: var(--surface-2); color: var(--ink); }
.side-nav a.is-active {
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-weight: 600;
}
.side-nav a.is-active::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 9px;
  bottom: 9px;
  width: 2px;
  border-radius: 1px;
  background: var(--accent);
}
.side-foot {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 11.5px;
  line-height: 1.7;
}

.doc-main { min-width: 0; max-width: 800px; }

.doc-section {
  padding-bottom: 40px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.doc-section:last-child { border-bottom: 0; margin-bottom: 0; }

.doc-section > h2 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 26px;
  letter-spacing: -0.026em;
}
.doc-section > h2 .num {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
}
.doc-section h3 {
  margin: 30px 0 10px;
  font-size: 17px;
  letter-spacing: -0.012em;
}
.doc-section h4 {
  margin: 22px 0 8px;
  font-size: 14.5px;
}
.doc-section p {
  margin-top: 12px;
  color: var(--ink-2);
  font-size: 14.5px;
  line-height: 1.82;
  text-wrap: pretty;
}
.doc-section p strong, .doc-section li strong { color: var(--ink); font-weight: 600; }
.doc-section a:not(.btn) {
  color: var(--accent-ink);
  text-decoration: underline;
  text-decoration-color: var(--accent-line);
  text-underline-offset: 3px;
}
.doc-section a:not(.btn):hover { text-decoration-color: var(--accent); }

.doc-section ul, .doc-section ol {
  margin: 12px 0 0;
  padding-left: 20px;
  color: var(--ink-2);
  font-size: 14.5px;
  line-height: 1.8;
}
.doc-section li + li { margin-top: 6px; }
.doc-section li::marker { color: var(--accent); }

.anchor {
  margin-left: -6px;
  padding-right: 0;
  color: var(--line-strong);
  font-weight: 400;
  opacity: 0;
  transition: opacity 0.15s var(--ease), color 0.15s var(--ease);
}
h2:hover .anchor, h3:hover .anchor { opacity: 1; }
.anchor:hover { color: var(--accent); }

/* ---------- 18. Code ---------- */
.code {
  position: relative;
  margin: 16px 0 0;
  border: 1px solid var(--code-line);
  border-radius: 10px;
  background: var(--code-bg);
  overflow: hidden;
}
.code-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 10px 8px 14px;
  border-bottom: 1px solid var(--code-line);
  background: var(--code-bg-2);
}
.code-lang {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--code-dim);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.code-lang::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.8;
}
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 8px;
  border: 1px solid var(--code-line);
  border-radius: 5px;
  background: transparent;
  color: var(--code-dim);
  font-size: 11px;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease),
    background 0.15s var(--ease);
}
.copy-btn:hover { color: var(--code-ink); border-color: #3b5052; background: rgba(255, 255, 255, 0.04); }
.copy-btn.is-done { color: var(--accent); border-color: var(--accent); }

.code pre {
  margin: 0;
  padding: 15px 16px;
  overflow-x: auto;
  color: var(--code-ink);
  font-size: 12.5px;
  line-height: 1.72;
  tab-size: 2;
  scrollbar-width: thin;
}
.code pre::-webkit-scrollbar { height: 8px; }
.code pre::-webkit-scrollbar-thumb { background: #2c3d3f; border-radius: 4px; }

.code .c { color: #6f8686; }
.code .s { color: #a9d8a0; }
.code .k { color: #7fd5cc; }
.code .n { color: #e3c68b; }

.code-inline {
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface-2);
  color: var(--ink);
  font-size: 0.9em;
  word-break: break-word;
}

/* tabs */
.tabs { margin-top: 16px; }
.tab-bar {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  scrollbar-width: none;
}
.tab-bar::-webkit-scrollbar { display: none; }
.tab-bar button {
  position: relative;
  padding: 9px 13px;
  border: 0;
  background: transparent;
  color: var(--ink-3);
  font-size: 12.5px;
  white-space: nowrap;
  transition: color 0.15s var(--ease);
}
.tab-bar button:hover { color: var(--ink); }
.tab-bar button[aria-selected="true"] {
  color: var(--accent-ink);
  font-weight: 600;
}
.tab-bar button[aria-selected="true"]::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: -1px;
  height: 2px;
  border-radius: 1px;
  background: var(--accent);
}
.tab-panel[hidden] { display: none; }
.tab-panel .code { margin-top: 14px; }

/* ---------- 19. Tables / callouts ---------- */
.table-wrap {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow-x: auto;
}
table.tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  line-height: 1.68;
}
.tbl th, .tbl td {
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.tbl thead th {
  background: var(--surface-2);
  color: var(--ink-3);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.tbl tbody tr:last-child td { border-bottom: 0; }
.tbl tbody tr:hover { background: var(--surface-2); }
.tbl td:first-child { white-space: nowrap; }
.tbl code {
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--surface-3);
  color: var(--ink);
  font-size: 12px;
}

.callout {
  display: flex;
  gap: 12px;
  margin-top: 18px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
  background: var(--surface-2);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-2);
}
.callout svg { flex: none; margin-top: 2px; color: var(--accent); }
.callout strong { color: var(--ink); }
.callout p { margin: 0; font-size: inherit; color: inherit; }
.callout p + p { margin-top: 6px; }
.callout.warn { border-left-color: #c98a25; }
.callout.warn svg { color: #c98a25; }
.callout.danger { border-left-color: #c0504d; }
.callout.danger svg { color: #c0504d; }
html[data-theme="dark"] .callout.warn { border-left-color: #e0ad57; }
html[data-theme="dark"] .callout.warn svg { color: #e0ad57; }
html[data-theme="dark"] .callout.danger { border-left-color: #e2807d; }
html[data-theme="dark"] .callout.danger svg { color: #e2807d; }

.facts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 18px;
}
.fact-card {
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}
.fact-card .k {
  color: var(--ink-3);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.fact-card .v {
  margin-top: 5px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink);
  word-break: break-all;
}
.fact-card .v small {
  font-family: var(--font);
  color: var(--ink-3);
  font-size: 11px;
}

/* doc pager */
.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 8px;
}
.pager a {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  transition: border-color 0.16s var(--ease), transform 0.16s var(--ease);
}
.pager a:hover { border-color: var(--accent-line); transform: translateY(-1px); }
.pager .dir { color: var(--ink-3); font-size: 11px; letter-spacing: 0.06em; }
.pager .t { margin-top: 4px; font-size: 14px; font-weight: 600; color: var(--ink); }
.pager a.next { text-align: right; }

/* ---------- 20. Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  will-change: opacity, transform;
}
.reveal.in { opacity: 1; transform: none; }
.no-reveal .reveal { opacity: 1; transform: none; transition: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 21. Responsive ---------- */
@media (max-width: 1080px) {
  .hero-top { grid-template-columns: minmax(0, 1fr) 320px; gap: 40px; }
  .hero::before { height: 560px; }
  .hero h1 { font-size: clamp(30px, 4vw, 38px); }
  .hero-shot { margin-top: 42px; }
  .module { gap: 40px; }
  .doc-shell { grid-template-columns: 210px minmax(0, 1fr); gap: 36px; }
}

@media (max-width: 900px) {
  :root { --header-h: 60px; }
  .wrap, .header-inner { width: calc(100% - 36px); }
  .site-nav { display: none; }
  .menu-toggle { display: inline-grid; }
  .brand-ver { display: none; }

  .section { padding: 64px 0; }
  .hero { padding: 46px 0 56px; }
  .hero-top { grid-template-columns: minmax(0, 1fr); gap: 30px; align-items: start; }
  .hotkeys { max-width: 460px; }
  .hero-grid-bg { display: none; }
  .module-bar .wrap { grid-template-columns: 1fr 1fr; }
  .module-bar a { padding: 16px 16px 16px 0; }
  .module-bar a:nth-child(odd) { padding-left: 0; border-left: 0; }
  .module-bar a:nth-child(even) { padding-left: 18px; border-left: 1px solid var(--line); }
  .module-bar a:nth-child(n + 3) { border-top: 1px solid var(--line); }

  .cards { grid-template-columns: 1fr; }
  .module { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .module.flip .module-text { order: 0; }
  .module.flip .module-media { order: 1; }

  .download-card { grid-template-columns: 1fr; gap: 30px; padding: 30px; }
  .limits { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-mark { display: none; }

  .doc-shell { grid-template-columns: 1fr; gap: 24px; padding-top: 28px; }
  .doc-side {
    position: static;
    max-height: none;
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface);
  }
  .doc-side .side-group { margin-top: 10px; }
  .doc-side .side-foot { display: none; }
  .side-toggle { display: flex; }
  .doc-side.is-collapsed { padding-bottom: 16px; }
  .doc-side.is-collapsed .side-body { display: none; }
  .doc-main { max-width: none; }
}

@media (max-width: 640px) {
  body { font-size: 15px; }
  .hero { padding: 38px 0 48px; }
  .hero-meta { gap: 5px 12px; font-size: 12px; }
  .hero h1 { font-size: clamp(26px, 7vw, 32px); }
  .hotkeys { max-width: none; }
  .hero-shot { margin-top: 34px; }
  .hero-shot-frame { border-radius: 14px; }
  .hero-shot-cap { flex-direction: column; align-items: flex-start; gap: 4px; font-size: 10.5px; }
  .module-bar .wrap { grid-template-columns: 1fr; }
  .module-bar a, .module-bar a:nth-child(even) {
    padding: 14px 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }
  .module-bar a:first-child { border-top: 0; }
  .limits { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; }
  .flow-wide { margin-top: 26px; padding: 16px; }
  .flow-arrow { transform: rotate(90deg); justify-self: center; }
  .demo-stage { min-height: 170px; padding: 22px 12px; }
  .dock { gap: 4px; padding: 8px 10px; }
  .tile { width: 28px; height: 28px; }
  .demo-tray { display: none; }
  .code pre { white-space: pre-wrap; overflow-wrap: anywhere; }
  .demo-row { flex-wrap: wrap; gap: 10px; }
  .demo-row > label { width: auto; }
  .demo-row output { margin-left: auto; }
  .doc-section > h2 { font-size: 22px; }
  .pager { grid-template-columns: 1fr; }
  .download-card { padding: 24px; }
  .footer-grid { grid-template-columns: 1fr; }
  .doc-hero { padding: 36px 0 24px; }
  .doc-meta { gap: 6px; }
  .doc-meta .pill { font-size: 11px; padding: 3px 8px; }
  .tbl { min-width: 540px; }
  .table-wrap { scrollbar-width: thin; }
}

/* ---------- 22. Print ---------- */
@media print {
  .site-header, .doc-side, .site-footer, .hero-orbit, .mobile-nav, .copy-btn { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .doc-shell { display: block; padding: 0; }
  .doc-section { break-inside: avoid-page; }
  .code { border-color: #ccc; }
  .code pre { white-space: pre-wrap; }
}