/* kk 官网共用样式：令牌抄自 packages/ui 的石墨深浅两套（见 docs/DESIGN.md「官网」一节），改令牌请先改那边。
   不加载任何第三方字体或脚本。 */
:root {
  /* graphite-light */
  --bg-app: #f4f4f5;
  --bg-sidebar: #ebebed;
  --bg-panel: #ffffff;
  --bg-elevated: #f0f0f2;
  --bg-hover: rgba(0, 0, 0, 0.04);
  --bg-active: rgba(0, 0, 0, 0.07);
  --line-subtle: rgba(0, 0, 0, 0.07);
  --line-strong: rgba(0, 0, 0, 0.13);
  --text-primary: #1a1b1e;
  --text-secondary: #5e6168;
  --text-source: #8a8d93;
  --text-partial: #b4b6bb;
  --text-muted: #8e9197;
  --accent: #2a2b2f;
  --accent-on: #ffffff;
  --rec: #ff5a52;
  --highlight: #a9843f;
  --highlight-soft: rgba(169, 132, 63, 0.14);
  --success: #2f9e63;
  --warning: #b7791f;
  --danger: #eb5757;
  --glass-bg: rgba(255, 255, 255, 0.78);
  --glass-border: rgba(0, 0, 0, 0.08);
  --shadow-float: 0 12px 40px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-window: 0 40px 120px rgba(20, 22, 28, 0.16), 0 8px 24px rgba(20, 22, 28, 0.08);
  --silver-1: #ffffff;
  --silver-2: #c9cbd1;
  --silver-glow: rgba(120, 124, 135, 0.18);
  --hero-ink: #1a1b1e;

  --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei UI', 'Noto Sans SC', system-ui, sans-serif;
  --font-mono: 'Cascadia Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --dur-instant: 80ms;
  --dur-fast: 140ms;
  --dur-base: 200ms;
  --dur-slow: 320ms;
  --ease-out: cubic-bezier(0.2, 0.8, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-inout: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-loop-calm: 2.4s;
  --dur-loop-busy: 1.6s;
  --dur-loop-caret: 1s;

  --page-w: 1120px;
  --gutter-l: max(16px, env(safe-area-inset-left, 0px));
  --gutter-r: max(16px, env(safe-area-inset-right, 0px));
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg-app: #111214;
    --bg-sidebar: #0d0e10;
    --bg-panel: #16171a;
    --bg-elevated: #1d1e22;
    --bg-hover: rgba(255, 255, 255, 0.05);
    --bg-active: rgba(255, 255, 255, 0.08);
    --line-subtle: rgba(255, 255, 255, 0.06);
    --line-strong: rgba(255, 255, 255, 0.12);
    --text-primary: #ecedef;
    --text-secondary: #9a9da4;
    --text-source: #9a9da4;
    --text-partial: #6a6d73;
    --text-muted: #7f8288;
    --accent: #d9dadf;
    --accent-on: #111214;
    --highlight: #d9b97a;
    --highlight-soft: rgba(217, 185, 122, 0.12);
    --success: #6fcf97;
    --warning: #e2b04a;
    --glass-bg: rgba(22, 23, 26, 0.72);
    --glass-border: rgba(255, 255, 255, 0.08);
    --shadow-float: 0 12px 40px rgba(0, 0, 0, 0.45), 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-window: 0 40px 120px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.06);
    --silver-1: #f2f3f5;
    --silver-2: #8a8e97;
    --silver-glow: rgba(203, 205, 211, 0.1);
    --hero-ink: #f2f3f5;
    color-scheme: dark;
  }
}
:root[data-theme='dark'] {
  --bg-app: #111214;
  --bg-sidebar: #0d0e10;
  --bg-panel: #16171a;
  --bg-elevated: #1d1e22;
  --bg-hover: rgba(255, 255, 255, 0.05);
  --bg-active: rgba(255, 255, 255, 0.08);
  --line-subtle: rgba(255, 255, 255, 0.06);
  --line-strong: rgba(255, 255, 255, 0.12);
  --text-primary: #ecedef;
  --text-secondary: #9a9da4;
  --text-source: #9a9da4;
  --text-partial: #6a6d73;
  --text-muted: #7f8288;
  --accent: #d9dadf;
  --accent-on: #111214;
  --highlight: #d9b97a;
  --highlight-soft: rgba(217, 185, 122, 0.12);
  --success: #6fcf97;
  --warning: #e2b04a;
  --glass-bg: rgba(22, 23, 26, 0.72);
  --glass-border: rgba(255, 255, 255, 0.08);
  --shadow-float: 0 12px 40px rgba(0, 0, 0, 0.45), 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-window: 0 40px 120px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.06);
  --silver-1: #f2f3f5;
  --silver-2: #8a8e97;
  --silver-glow: rgba(203, 205, 211, 0.1);
  --hero-ink: #f2f3f5;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--bg-app);
  color: var(--text-primary);
  font: 400 15px/1.65 var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition:
    background-color var(--dur-slow) var(--ease-out),
    color var(--dur-slow) var(--ease-out);
}
a {
  color: inherit;
  text-decoration: none;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}
.ico {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: none;
}
.wrap {
  max-width: calc(var(--page-w) + 32px);
  margin: 0 auto;
  padding-left: var(--gutter-l);
  padding-right: var(--gutter-r);
}
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 顶栏 ---------- */
.nav {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 20;
}
.nav::before {
  content: '';
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--bg-app) 78%, transparent);
  backdrop-filter: blur(18px) saturate(1.2);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
  border-bottom: 1px solid var(--line-subtle);
  opacity: var(--nav-solid, 1);
  transition: opacity var(--dur-slow) var(--ease-out);
}
.nav .wrap {
  position: relative;
  display: flex;
  align-items: center;
  gap: 28px;
  height: 60px;
}
.wordmark {
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.04em;
  line-height: 1;
}
.nav-links {
  display: flex;
  gap: 22px;
  font-size: 14px;
  color: var(--text-secondary);
}
.nav-links a {
  transition: color var(--dur-fast) var(--ease-out);
}
.nav-links a:hover {
  color: var(--text-primary);
}
.nav-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}
.icon-btn {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition:
    background var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out);
}
.icon-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.lang {
  font-size: 13px;
  color: var(--text-secondary);
  padding: 0 10px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: var(--radius-sm);
}
.lang:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.theme-toggle .sun {
  display: none;
}
:root[data-theme='dark'] .theme-toggle .sun {
  display: block;
}
:root[data-theme='dark'] .theme-toggle .moon {
  display: none;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) .theme-toggle .sun {
    display: block;
  }
  :root:not([data-theme='light']) .theme-toggle .moon {
    display: none;
  }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 46px;
  padding: 0 22px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    transform var(--dur-fast) var(--ease-out),
    background var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);
}
.btn:active {
  transform: scale(0.97);
  transition-duration: var(--dur-instant);
}
.btn-primary {
  background: var(--accent);
  color: var(--accent-on);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.25) inset,
    0 8px 24px -8px rgba(0, 0, 0, 0.35);
}
.btn-primary:hover {
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.25) inset,
    0 12px 32px -8px rgba(0, 0, 0, 0.45);
  transform: translateY(-1px);
}
.btn-ghost {
  color: var(--text-primary);
  border-color: var(--line-strong);
}
.btn-ghost:hover {
  background: var(--bg-hover);
}
.btn-sm {
  height: 36px;
  padding: 0 16px;
  font-size: 14px;
}
.dl-meta {
  font-size: 12.5px;
  color: var(--text-muted);
}

/* ---------- 下载页 ---------- */
.dlp {
  padding-block: 72px 112px;
}
.dlp .wrap {
  max-width: calc(720px + 32px);
  display: grid;
  gap: 56px;
}
.dlp-top {
  display: grid;
  gap: 10px;
  justify-items: center;
  text-align: center;
}
.dlp-top h1 {
  margin: 0;
  font-size: clamp(34px, 6vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.03em;
}
.dlp-top .lead {
  margin: 0;
  color: var(--text-secondary);
  font-size: 16px;
}
.dlp-card {
  margin-top: 26px;
  width: 100%;
  display: grid;
  gap: 14px;
  justify-items: center;
  padding: 32px 28px 26px;
  border-radius: var(--radius-lg);
  background: var(--bg-panel);
  border: 1px solid var(--line-subtle);
}
.dlp-ver {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: baseline;
  gap: 4px 12px;
  font-size: 17px;
}
.dlp-ver .mono,
.dlp-file {
  font-size: 13px;
  color: var(--text-muted);
}
.dlp-file {
  margin-top: -8px;
  overflow-wrap: anywhere;
}
.dlp-acts {
  margin-top: 6px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.dlp-acts .ico {
  width: 18px;
  height: 18px;
}
.dlp-hint {
  margin: 4px 0 0;
  max-width: 46ch;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-muted);
}
.dlp-sec h2 {
  margin: 0 0 14px;
  font-size: 20px;
  letter-spacing: -0.015em;
}
.dlp-sec p,
.dlp-sec ol,
.dlp-sec ul {
  margin: 0;
  color: var(--text-secondary);
  font-size: 15.5px;
  line-height: 1.75;
}
.dlp-sec ol,
.dlp-sec ul {
  padding-left: 1.3em;
  display: grid;
  gap: 6px;
}
.dlp-notes {
  font-size: 14.5px !important;
  gap: 2px !important;
}
@media (max-width: 560px) {
  .dlp {
    padding-block: 48px 88px;
  }
  .dlp-card {
    padding: 26px 18px 22px;
  }
  .dlp-acts,
  .dlp-acts .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ---------- 页脚 ---------- */
.foot {
  border-top: 1px solid var(--line-subtle);
  padding-block: 40px 56px;
  font-size: 13px;
  color: var(--text-muted);
}
.foot .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  align-items: center;
}
.foot nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
}
.foot nav a:hover {
  color: var(--text-primary);
}
.foot .r {
  margin-left: auto;
}
.todo {
  color: var(--warning);
}
mark.todo {
  background: var(--highlight-soft);
  color: var(--warning);
  padding: 0 4px;
  border-radius: 4px;
  font-weight: 600;
}
.foot .r mark.todo {
  font-weight: 400;
}

@media (max-width: 760px) {
  .nav-links {
    display: none;
  }
  .nav .wrap {
    gap: 12px;
  }
  .btn-sm.dl-btn {
    display: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 政策页：长文阅读 ---------- */
.doc {
  padding-block: 56px 96px;
}
.doc-grid {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}
.doc-toc {
  position: sticky;
  top: 84px;
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-left: 1px solid var(--line-subtle);
  padding-left: 14px;
}
.doc-toc .t {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 4px;
}
.doc-toc a {
  transition: color var(--dur-fast) var(--ease-out);
}
.doc-toc a:hover {
  color: var(--text-primary);
}
.prose {
  max-width: 65ch;
  min-width: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-secondary);
}
.prose h1 {
  font-size: clamp(30px, 4.5vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin: 0 0 8px;
  text-wrap: balance;
}
.prose .updated {
  color: var(--text-muted);
  font-size: 13.5px;
  margin: 0 0 32px;
}
.prose h2 {
  font-size: 22px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin: 48px 0 12px;
  scroll-margin-top: 84px;
}
.prose h3 {
  font-size: 17px;
  color: var(--text-primary);
  margin: 28px 0 8px;
}
.prose p,
.prose ul,
.prose ol {
  margin: 0 0 14px;
}
.prose ul,
.prose ol {
  padding-left: 1.4em;
}
.prose li {
  margin: 4px 0;
}
.prose strong {
  color: var(--text-primary);
  font-weight: 600;
}
.prose a {
  color: var(--text-primary);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
}
.prose a:hover {
  text-decoration-color: currentColor;
}
.prose .note {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-size: 14.5px;
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  margin: 0 0 18px;
  display: block;
  overflow-x: auto;
}
.prose th,
.prose td {
  text-align: left;
  vertical-align: top;
  padding: 10px 14px 10px 0;
  border-top: 1px solid var(--line-subtle);
}
.prose th {
  color: var(--text-primary);
  font-weight: 600;
  white-space: nowrap;
}
.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-elevated);
  padding: 1px 5px;
  border-radius: 4px;
}
@media (max-width: 900px) {
  .doc-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }
  .doc-toc {
    position: static;
    border-left: 0;
    padding-left: 0;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px 16px;
  }
  .doc-toc .t {
    width: 100%;
  }
  .doc {
    padding-block: 36px 72px;
  }
}