/* ==========================================================================
   SigXor website — theme tokens
   Dark is the default; light applies via data-theme or the OS preference.
   ========================================================================== */

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

  --bg: #0d1117;
  --bg-alt: #11161d;
  --surface: #161b22;
  --surface-2: #1c2128;
  --border: #30363d;
  --border-subtle: #21262d;

  --text: #e6edf3;
  --text-secondary: #9ba7b4;
  --text-muted: #7d8590;

  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --accent-contrast: #ffffff;
  --accent-bg: rgba(56, 139, 253, 0.12);
  --accent-border: rgba(56, 139, 253, 0.38);

  --green: #3fb950;
  --yellow: #d29922;
  --red: #f85149;
  --purple: #bc8cff;
  --pink: #f778ba;

  --gradient: linear-gradient(135deg, #58a6ff 0%, #bc8cff 52%, #f778ba 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(88, 166, 255, 0.16), rgba(188, 140, 255, 0.14) 52%, rgba(247, 120, 186, 0.12));

  --nav-bg: rgba(13, 17, 23, 0.82);
  --nav-bg-solid: rgba(13, 17, 23, 0.96);
  --hero-grid: rgba(48, 54, 61, 0.34);
  --hero-glow: radial-gradient(ellipse at center, rgba(88, 166, 255, 0.14) 0%, rgba(188, 140, 255, 0.07) 42%, transparent 72%);

  --code-bg: #0f141b;
  --code-text: #c9d1d9;
  --code-keyword: #ff7b72;
  --code-string: #a5d6ff;
  --code-comment: #7d8590;
  --code-function: #d2a8ff;
  --code-number: #79c0ff;
  --code-type: #ffa657;
  --code-attr: #79c0ff;
  --code-builtin: #ffa657;
  --code-meta: #8b949e;
  --code-addition-bg: rgba(46, 160, 67, 0.15);
  --code-deletion-bg: rgba(248, 81, 73, 0.15);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.45);

  --radius-sm: 7px;
  --radius: 13px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Noto Sans CJK SC", "Microsoft YaHei UI", "Microsoft YaHei", Helvetica, Arial, sans-serif;
  --font-mono: "Cascadia Code", "SFMono-Regular", "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;

  --nav-h: 64px;
  --container: 1180px;
  --ease: 0.2s ease;
}

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

  --bg: #ffffff;
  --bg-alt: #f6f8fa;
  --surface: #f6f8fa;
  --surface-2: #eef2f6;
  --border: #d0d7de;
  --border-subtle: #e6eaef;

  --text: #1f2328;
  --text-secondary: #57606a;
  --text-muted: #68707a;

  --accent: #0969da;
  --accent-hover: #0550ae;
  --accent-contrast: #ffffff;
  --accent-bg: rgba(9, 105, 218, 0.08);
  --accent-border: rgba(9, 105, 218, 0.32);

  --green: #1a7f37;
  --yellow: #9a6700;
  --red: #cf222e;
  --purple: #8250df;
  --pink: #bf3989;

  --gradient: linear-gradient(135deg, #0969da 0%, #8250df 52%, #bf3989 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(9, 105, 218, 0.1), rgba(130, 80, 223, 0.09) 52%, rgba(191, 57, 137, 0.08));

  --nav-bg: rgba(255, 255, 255, 0.84);
  --nav-bg-solid: rgba(255, 255, 255, 0.97);
  --hero-grid: rgba(208, 215, 222, 0.55);
  --hero-glow: radial-gradient(ellipse at center, rgba(9, 105, 218, 0.11) 0%, rgba(130, 80, 223, 0.06) 42%, transparent 72%);

  --code-bg: #f6f8fa;
  --code-text: #1f2328;
  --code-keyword: #cf222e;
  --code-string: #0a3069;
  --code-comment: #68707a;
  --code-function: #8250df;
  --code-number: #0550ae;
  --code-type: #953800;
  --code-attr: #0550ae;
  --code-builtin: #953800;
  --code-meta: #57606a;
  --code-addition-bg: rgba(26, 127, 55, 0.1);
  --code-deletion-bg: rgba(207, 34, 46, 0.1);

  --shadow-sm: 0 1px 2px rgba(31, 35, 40, 0.08);
  --shadow: 0 8px 24px rgba(31, 35, 40, 0.09);
  --shadow-lg: 0 18px 48px rgba(31, 35, 40, 0.12);
}

@media (prefers-color-scheme: light) {
  html:not([data-theme="dark"]) {
    color-scheme: light;

    --bg: #ffffff;
    --bg-alt: #f6f8fa;
    --surface: #f6f8fa;
    --surface-2: #eef2f6;
    --border: #d0d7de;
    --border-subtle: #e6eaef;

    --text: #1f2328;
    --text-secondary: #57606a;
    --text-muted: #68707a;

    --accent: #0969da;
    --accent-hover: #0550ae;
    --accent-contrast: #ffffff;
    --accent-bg: rgba(9, 105, 218, 0.08);
    --accent-border: rgba(9, 105, 218, 0.32);

    --green: #1a7f37;
    --yellow: #9a6700;
    --red: #cf222e;
    --purple: #8250df;
    --pink: #bf3989;

    --gradient: linear-gradient(135deg, #0969da 0%, #8250df 52%, #bf3989 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(9, 105, 218, 0.1), rgba(130, 80, 223, 0.09) 52%, rgba(191, 57, 137, 0.08));

    --nav-bg: rgba(255, 255, 255, 0.84);
    --nav-bg-solid: rgba(255, 255, 255, 0.97);
    --hero-grid: rgba(208, 215, 222, 0.55);
    --hero-glow: radial-gradient(ellipse at center, rgba(9, 105, 218, 0.11) 0%, rgba(130, 80, 223, 0.06) 42%, transparent 72%);

    --code-bg: #f6f8fa;
    --code-text: #1f2328;
    --code-keyword: #cf222e;
    --code-string: #0a3069;
    --code-comment: #68707a;
    --code-function: #8250df;
    --code-number: #0550ae;
    --code-type: #953800;
    --code-attr: #0550ae;
    --code-builtin: #953800;
    --code-meta: #57606a;
    --code-addition-bg: rgba(26, 127, 55, 0.1);
    --code-deletion-bg: rgba(207, 34, 46, 0.1);

    --shadow-sm: 0 1px 2px rgba(31, 35, 40, 0.08);
    --shadow: 0 8px 24px rgba(31, 35, 40, 0.09);
    --shadow-lg: 0 18px 48px rgba(31, 35, 40, 0.12);
  }
}

/* ==========================================================================
   Reset and base
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--ease);
}

a:hover {
  color: var(--accent-hover);
}

button {
  font: inherit;
  color: inherit;
}

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

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

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

code {
  font-size: 0.875em;
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: 5px;
  padding: 0.12em 0.38em;
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 26px;
  padding: 0 7px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 6px;
  white-space: nowrap;
  vertical-align: 0.08em;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 2000;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--accent-contrast);
  border-radius: var(--radius-sm);
  transform: translateY(-160%);
  transition: transform var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--accent-contrast);
}

.clipboard-helper {
  position: fixed;
  top: -1000px;
  left: -1000px;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 18px;
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: background var(--ease), border-color var(--ease), color var(--ease), transform var(--ease), box-shadow var(--ease);
}

.btn:hover {
  color: var(--text);
  border-color: var(--text-muted);
  transform: translateY(-1px);
}

.btn svg {
  flex-shrink: 0;
}

.btn-primary {
  color: var(--accent-contrast);
  background: var(--accent);
  border-color: var(--accent);
}

.btn-primary:hover {
  color: var(--accent-contrast);
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 6px 24px rgba(56, 139, 253, 0.28);
}

.btn-outline {
  color: var(--text);
  background: transparent;
}

.btn-outline:hover {
  background: var(--surface);
}

.btn-lg {
  padding: 14px 26px;
  font-size: 1rem;
}

.btn-block {
  display: flex;
  width: 100%;
}

/* ==========================================================================
   Navbar
   ========================================================================== */

.navbar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  height: var(--nav-h);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
}

.navbar.scrolled {
  background: var(--nav-bg-solid);
  border-bottom-color: var(--border);
}

.nav-content {
  display: flex;
  align-items: center;
  gap: 26px;
  height: 100%;
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--text);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
}

.nav-logo:hover {
  color: var(--text);
}

.nav-logo img,
.nav-logo svg {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.logo-cn {
  margin-left: 6px;
  font-size: 0.72em;
  font-weight: 500;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  flex: 1;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text);
}

.nav-links a[aria-current="page"] {
  position: relative;
}

.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -21px;
  left: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.lang-switch,
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 40px;
  height: 36px;
  padding: 0 10px;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.lang-switch {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.lang-switch:hover,
.theme-toggle:hover {
  color: var(--text);
  background: var(--surface);
  border-color: var(--text-muted);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.theme-icon-sun { display: none; }
.theme-icon-moon { display: block; }
html[data-theme="light"] .theme-icon-sun { display: block; }
html[data-theme="light"] .theme-icon-moon { display: none; }

.nav-cta {
  height: 36px;
  padding: 0 16px;
  font-size: 0.85rem;
}

.nav-mobile {
  display: none;
  position: relative;
}

.nav-mobile summary {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 36px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  list-style: none;
}

.nav-mobile summary::-webkit-details-marker { display: none; }

.nav-mobile[open] summary {
  background: var(--surface);
  border-color: var(--accent-border);
}

.nav-mobile-panel {
  position: fixed;
  top: var(--nav-h);
  right: 0;
  left: 0;
  max-height: calc(100vh - var(--nav-h));
  overflow-y: auto;
  padding: 22px 28px 30px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.nav-mobile-panel a {
  display: block;
  padding: 11px 0;
  color: var(--text-secondary);
  font-size: 1.02rem;
  font-weight: 500;
  border-bottom: 1px solid var(--border-subtle);
}

.nav-mobile-panel a:hover,
.nav-mobile-panel a[aria-current="page"] {
  color: var(--text);
}

.nav-mobile-panel .btn {
  margin-top: 18px;
  border-bottom: 0;
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 92vh;
  padding: calc(var(--nav-h) + 64px) 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.hero-gradient {
  position: absolute;
  top: -22%;
  left: 50%;
  width: 130%;
  height: 78%;
  background: var(--hero-glow);
  transform: translateX(-50%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--hero-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--hero-grid) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.42;
  mask-image: radial-gradient(ellipse at 50% 38%, #000 5%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 38%, #000 5%, transparent 72%);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  margin-bottom: 24px;
  padding: 6px 15px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: var(--accent-bg);
  border: 1px solid var(--accent-border);
  border-radius: 999px;
}

.hero-title {
  margin-bottom: 22px;
  font-size: clamp(2.6rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.035em;
}

.gradient-text {
  color: transparent;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 660px;
  margin: 0 auto 34px;
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 54px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px 52px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.stat-value {
  color: transparent;
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* ==========================================================================
   Sections and shared cards
   ========================================================================== */

.section {
  padding: 92px 0;
}

.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  max-width: 720px;
  margin: 0 auto 52px;
  text-align: center;
}

.section-title {
  margin-bottom: 12px;
  font-size: clamp(1.75rem, 3.4vw, 2.25rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.025em;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.03rem;
}

.eyebrow {
  margin-bottom: 10px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.section-alt .card {
  background: var(--bg);
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 18px;
  font-size: 0.9rem;
  font-weight: 600;
}

.link-more svg {
  transition: transform var(--ease);
}

.link-more:hover svg {
  transform: translateX(3px);
}

/* --- About / facts --- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 56px;
  align-items: start;
}

.about-copy h2 {
  margin-bottom: 18px;
  font-size: clamp(1.7rem, 3vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.about-copy p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.8;
}

.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  margin-top: 24px;
}

.about-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.92rem;
  font-weight: 600;
}

.facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.fact {
  padding: 18px 20px;
  background: var(--surface);
}

.fact dt {
  margin-bottom: 3px;
  color: var(--text-muted);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.fact dd {
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.45;
}

/* --- Feature hero with mockup --- */

.feature-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 54px;
  align-items: center;
  margin-bottom: 64px;
  padding: 46px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.feature-icon-lg {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 58px;
  height: 58px;
  margin-bottom: 18px;
  color: var(--accent);
  background: var(--gradient-subtle);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius);
}

.feature-hero-content,
.mockup {
  min-width: 0;
}

.feature-hero-content h2,
.feature-hero-content h3 {
  margin-bottom: 12px;
  font-size: 1.65rem;
  font-weight: 750;
  letter-spacing: -0.02em;
}

.section-header-spaced {
  margin-top: 8px;
}

.feature-hero-content > p {
  margin-bottom: 18px;
  color: var(--text-secondary);
  font-size: 1.01rem;
  line-height: 1.75;
}

.check-list {
  display: grid;
  gap: 10px;
  list-style: none;
}

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.check-list svg {
  flex-shrink: 0;
  margin-top: 4px;
  color: var(--green);
}

.mockup {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}

.mockup-titlebar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 11px 15px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

.mockup-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.mockup-dot.red { background: #ff5f56; }
.mockup-dot.yellow { background: #ffbd2e; }
.mockup-dot.green { background: #27c93f; }

.mockup-title {
  margin-left: 8px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.mockup-body {
  overflow-x: auto;
  padding: 16px 0;
}

.mockup-body pre {
  margin: 0;
  padding: 0 20px;
  background: none;
  border: 0;
  font-size: 0.82rem;
  line-height: 1.75;
}

.mockup-body code {
  padding: 0;
  background: none;
  border: 0;
  font-size: inherit;
}

/* --- Feature grid --- */

.features-grid,
.formats-grid,
.safety-grid,
.shortcuts-grid,
.tech-grid {
  display: grid;
  gap: 20px;
}

.features-grid {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.feature-card {
  padding: 26px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}

.feature-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 15px;
  color: var(--accent);
  background: var(--accent-bg);
  border-radius: 9px;
}

.feature-card h3 {
  margin-bottom: 7px;
  font-size: 1.02rem;
  font-weight: 700;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
}

/* --- Safety --- */

.safety-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.safety-card {
  padding: 30px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.safety-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin-bottom: 18px;
  color: var(--accent);
  background: var(--gradient-subtle);
  border-radius: var(--radius);
}

.safety-card h3 {
  margin-bottom: 8px;
  font-size: 1.08rem;
  font-weight: 700;
}

.safety-card p {
  color: var(--text-secondary);
  font-size: 0.93rem;
  line-height: 1.7;
}

/* --- Formats --- */

.formats-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.format-group {
  padding: 26px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.section-alt .format-group {
  background: var(--bg);
}

.format-group h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 1rem;
  font-weight: 700;
}

.format-group h3 svg {
  color: var(--accent);
}

.format-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.tag {
  padding: 3px 10px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.tag:hover {
  color: var(--accent);
  background: var(--accent-bg);
  border-color: var(--accent-border);
}

.formats-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px 16px;
  margin-top: 28px;
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
}

.formats-note a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
}

/* --- Shortcuts --- */

.shortcuts-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.shortcut-group {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.shortcut-group h3 {
  padding-bottom: 13px;
  margin-bottom: 16px;
  font-size: 1rem;
  font-weight: 700;
  border-bottom: 1px solid var(--border-subtle);
}

.shortcut-list {
  display: grid;
  gap: 12px;
  list-style: none;
}

.shortcut-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px 10px;
}

.shortcut-keys {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
}

.shortcut-item span {
  color: var(--text-secondary);
  font-size: 0.86rem;
}

/* --- Tech --- */

.tech-grid {
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
}

.tech-card {
  padding: 22px;
  text-align: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--ease), transform var(--ease);
}

.tech-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
}

.tech-name {
  margin-bottom: 3px;
  font-size: 1rem;
  font-weight: 700;
}

.tech-desc {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* --- Download --- */

.download-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 22px;
  margin-bottom: 28px;
}

.download-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.download-card-primary {
  background:
    linear-gradient(180deg, var(--accent-bg) 0%, transparent 45%),
    var(--surface);
  border-color: var(--accent-border);
}

.download-card-header {
  margin-bottom: 22px;
}

.download-card-header svg {
  margin-bottom: 12px;
  color: var(--accent);
}

.download-card-header h3 {
  margin-bottom: 4px;
  font-size: 1.25rem;
  font-weight: 750;
}

.download-card-header p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.download-features {
  display: grid;
  flex: 1;
  gap: 10px;
  margin-bottom: 26px;
  list-style: none;
}

.download-features li {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.download-features svg {
  flex-shrink: 0;
  margin-top: 4px;
  color: var(--green);
}

.code-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.code-block {
  min-width: 0;
  overflow-x: auto;
  padding: 18px 20px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.code-block pre {
  margin: 0;
  color: var(--code-text);
  font-size: 0.78rem;
  line-height: 1.8;
}

.code-block code {
  padding: 0;
  background: none;
  border: 0;
  font-size: inherit;
}

.requirements {
  padding: 30px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.requirements h3 {
  margin-bottom: 18px;
  font-size: 1.02rem;
  font-weight: 700;
}

.req-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px 28px;
}

.req-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.req-label {
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.req-value {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
}

.download-notes {
  display: grid;
  gap: 8px;
  margin-top: 20px;
  padding-left: 20px;
  color: var(--text-muted);
  font-size: 0.87rem;
}

/* --- FAQ --- */

.faq-list {
  display: grid;
  gap: 10px;
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--ease);
}

.faq-item[open] {
  border-color: var(--accent-border);
}

.faq-item summary {
  position: relative;
  padding: 18px 54px 18px 22px;
  font-size: 0.98rem;
  font-weight: 650;
  cursor: pointer;
  list-style: none;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 22px;
  color: var(--text-muted);
  font-size: 1.25rem;
  font-weight: 400;
  line-height: 1;
  transform: translateY(-50%);
}

.faq-item[open] summary::after {
  content: "−";
  color: var(--accent);
}

.faq-answer {
  padding: 0 22px 20px;
  color: var(--text-secondary);
  font-size: 0.93rem;
  line-height: 1.75;
}

.faq-answer p + p {
  margin-top: 10px;
}

.faq-more {
  margin-top: 26px;
  text-align: center;
}

/* --- CTA --- */

.cta {
  padding: 64px 28px;
  text-align: center;
  background:
    radial-gradient(ellipse at 50% 0%, var(--accent-bg), transparent 65%),
    var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
}

.cta h2 {
  margin-bottom: 10px;
  font-size: clamp(1.7rem, 3.2vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.025em;
}

.cta p {
  max-width: 560px;
  margin: 0 auto 26px;
  color: var(--text-secondary);
  font-size: 1rem;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

/* ==========================================================================
   Docs index
   ========================================================================== */

.page-hero {
  padding: calc(var(--nav-h) + 64px) 0 44px;
  background:
    radial-gradient(ellipse at 50% 0%, var(--accent-bg), transparent 70%),
    var(--bg);
  border-bottom: 1px solid var(--border-subtle);
}

.page-hero h1 {
  margin-bottom: 12px;
  font-size: clamp(2rem, 4vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.page-hero p {
  max-width: 760px;
  color: var(--text-secondary);
  font-size: 1.03rem;
  line-height: 1.75;
}

.docs-index {
  padding: 52px 0 92px;
}

.docs-index-group {
  margin-bottom: 46px;
}

.docs-index-group h2 {
  margin-bottom: 17px;
  color: var(--text-muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.doc-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 16px;
}

.doc-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}

.doc-card:hover {
  color: var(--text);
  border-color: var(--accent-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.doc-card h3 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 7px;
  font-size: 1.04rem;
  font-weight: 700;
}

.doc-card h3 svg {
  flex-shrink: 0;
  color: var(--text-muted);
  transition: color var(--ease), transform var(--ease);
}

.doc-card:hover h3 svg {
  color: var(--accent);
  transform: translateX(3px);
}

.doc-card p {
  flex: 1;
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.6;
}

.doc-card-meta {
  margin-top: 14px;
  color: var(--text-muted);
  font-size: 0.76rem;
}

/* ==========================================================================
   Docs article
   ========================================================================== */

.docs-shell {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr) 206px;
  gap: 44px;
  align-items: start;
  padding-top: calc(var(--nav-h) + 36px);
  padding-bottom: 92px;
}

.docs-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 24px);
  max-height: calc(100vh - var(--nav-h) - 48px);
  overflow-y: auto;
  padding-right: 8px;
  scrollbar-width: thin;
}

.docs-sidebar::-webkit-scrollbar { width: 4px; }
.docs-sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.sidebar-home {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 20px;
  padding: 7px 10px;
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 650;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 7px;
}

.sidebar-home:hover {
  color: var(--accent);
  border-color: var(--accent-border);
}

.sidebar-group {
  margin-bottom: 20px;
}

.sidebar-group-title {
  padding: 5px 10px;
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.sidebar-link {
  display: block;
  padding: 6px 10px;
  color: var(--text-secondary);
  font-size: 0.86rem;
  line-height: 1.45;
  border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  transition: color var(--ease), background var(--ease), border-color var(--ease);
}

.sidebar-link:hover {
  color: var(--text);
  background: var(--surface);
}

.sidebar-link[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-bg);
  border-left-color: var(--accent);
}

.docs-article {
  min-width: 0;
}

.breadcrumbs {
  margin-bottom: 18px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumbs a {
  color: var(--text-secondary);
}

.breadcrumbs a:hover {
  color: var(--accent);
}

.breadcrumbs [aria-current="page"] {
  color: var(--text);
}

.crumb-sep {
  color: var(--text-muted);
  opacity: 0.7;
}

.docs-header {
  padding-bottom: 24px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--border);
}

.docs-header h1 {
  margin-bottom: 10px;
  font-size: clamp(1.9rem, 4vw, 2.55rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.docs-lede {
  max-width: 760px;
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.75;
}

.docs-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  margin-top: 16px;
  color: var(--text-muted);
  font-size: 0.77rem;
}

.docs-meta a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--text-secondary);
}

.docs-meta a:hover {
  color: var(--accent);
}

.docs-mobile-nav,
.toc-mobile {
  display: none;
  margin-bottom: 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.docs-mobile-nav summary,
.toc-mobile summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 15px;
  font-size: 0.87rem;
  font-weight: 650;
  cursor: pointer;
  list-style: none;
}

.docs-mobile-nav summary::-webkit-details-marker,
.toc-mobile summary::-webkit-details-marker { display: none; }

.docs-mobile-nav summary::after,
.toc-mobile summary::after {
  content: "▾";
  color: var(--text-muted);
  font-size: 0.7rem;
}

.docs-mobile-panel {
  padding: 0 15px 14px;
}

.docs-mobile-panel .sidebar-group {
  margin-bottom: 12px;
}

.docs-mobile-panel .sidebar-group-title {
  padding-left: 0;
}

.docs-mobile-panel .sidebar-link {
  padding-left: 0;
  border-left: 0;
}

.docs-toc {
  position: sticky;
  top: calc(var(--nav-h) + 24px);
  max-height: calc(100vh - var(--nav-h) - 48px);
  overflow-y: auto;
  padding-left: 14px;
  border-left: 1px solid var(--border-subtle);
}

.docs-toc-title {
  margin-bottom: 11px;
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.docs-toc ul {
  display: grid;
  gap: 2px;
  list-style: none;
}

.docs-toc a {
  display: block;
  padding: 4px 0;
  color: var(--text-secondary);
  font-size: 0.79rem;
  line-height: 1.45;
  border-left: 2px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.docs-toc a:hover,
.docs-toc a.active {
  color: var(--accent);
}

.docs-toc a.active {
  border-left-color: var(--accent);
  margin-left: -16px;
  padding-left: 14px;
}

.docs-toc .toc-h3 {
  padding-left: 12px;
  font-size: 0.76rem;
}

.docs-pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 52px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.pager-link {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 16px 18px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--ease), background var(--ease);
}

.pager-link:hover {
  color: var(--text);
  border-color: var(--accent-border);
  background: var(--surface);
}

.pager-link.next {
  text-align: right;
}

.pager-label {
  display: flex;
  align-items: center;
  gap: 5px;
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.pager-link.next .pager-label {
  justify-content: flex-end;
}

.pager-title {
  font-size: 0.9rem;
  font-weight: 650;
}

.pager-spacer {
  visibility: hidden;
}

/* ==========================================================================
   Prose (Markdown output)
   ========================================================================== */

.prose {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.8;
  overflow-wrap: break-word;
}

.prose > :first-child {
  margin-top: 0;
}

.prose h2,
.prose h3,
.prose h4 {
  position: relative;
  color: var(--text);
  font-weight: 750;
  line-height: 1.35;
  scroll-margin-top: calc(var(--nav-h) + 20px);
}

.prose h2 {
  margin: 44px 0 16px;
  padding-bottom: 8px;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  border-bottom: 1px solid var(--border-subtle);
}

.prose h3 {
  margin: 32px 0 12px;
  font-size: 1.17rem;
}

.prose h4 {
  margin: 24px 0 9px;
  font-size: 1.02rem;
}

.heading-anchor {
  margin-left: 8px;
  color: var(--text-muted);
  font-weight: 400;
  opacity: 0;
  transition: opacity var(--ease), color var(--ease);
}

.prose h2:hover .heading-anchor,
.prose h3:hover .heading-anchor,
.prose h4:hover .heading-anchor,
.heading-anchor:focus-visible {
  opacity: 1;
}

.heading-anchor:hover {
  color: var(--accent);
}

.prose p {
  margin-bottom: 16px;
}

.prose a {
  text-decoration: underline;
  text-decoration-color: var(--accent-border);
  text-underline-offset: 0.18em;
}

.prose a:hover {
  text-decoration-color: var(--accent);
}

.prose strong {
  color: var(--text);
  font-weight: 650;
}

.prose ul,
.prose ol {
  margin: 0 0 16px;
  padding-left: 25px;
}

.prose li {
  margin-bottom: 6px;
}

.prose li > ul,
.prose li > ol {
  margin-top: 6px;
  margin-bottom: 4px;
}

.prose blockquote {
  margin: 20px 0;
  padding: 13px 20px;
  color: var(--text-secondary);
  background: var(--accent-bg);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose hr {
  margin: 36px 0;
  border: 0;
  border-top: 1px solid var(--border);
}

.prose .table-wrap {
  margin: 0 0 22px;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.87rem;
  line-height: 1.6;
}

.prose th,
.prose td {
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border-subtle);
}

.prose thead th {
  color: var(--text);
  font-weight: 650;
  background: var(--surface);
  border-bottom-color: var(--border);
}

.prose tbody tr:last-child td {
  border-bottom: 0;
}

.prose tbody tr:hover {
  background: var(--surface);
}

.prose pre {
  position: relative;
  margin: 0 0 22px;
  padding: 18px 20px;
  overflow-x: auto;
  color: var(--code-text);
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.83rem;
  line-height: 1.72;
  tab-size: 2;
}

.prose pre code {
  display: block;
  padding: 0;
  color: inherit;
  background: none;
  border: 0;
  font-size: inherit;
  line-height: inherit;
}

.prose :not(pre) > code {
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-subtle);
}

.prose img {
  height: auto;
  margin: 8px 0 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.prose kbd {
  margin: 0 1px;
  font-size: 0.7rem;
}

.code-wrap {
  position: relative;
  margin: 0 0 22px;
}

.code-wrap > pre {
  margin-bottom: 0;
}

.code-copy {
  position: absolute;
  top: 9px;
  right: 9px;
  z-index: 2;
  padding: 4px 9px;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 5px;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--ease), color var(--ease), border-color var(--ease);
}

pre:hover > .code-copy,
.code-copy:focus-visible {
  opacity: 1;
}

.code-copy:hover {
  color: var(--text);
  border-color: var(--accent-border);
}

@media (hover: none) {
  .code-copy {
    opacity: 0.9;
  }
}

/* ==========================================================================
   Syntax highlighting (highlight.js classes mapped to theme tokens)
   ========================================================================== */

.hljs { color: var(--code-text); background: transparent; }

.hljs-comment,
.hljs-quote { color: var(--code-comment); font-style: italic; }

.hljs-keyword,
.hljs-selector-tag,
.hljs-literal,
.hljs-section,
.hljs-doctag,
.hljs-name,
.hljs-strong { color: var(--code-keyword); }

.hljs-string,
.hljs-regexp,
.hljs-addition,
.hljs-attribute,
.hljs-meta .hljs-string { color: var(--code-string); }

.hljs-number,
.hljs-symbol,
.hljs-bullet,
.hljs-link,
.hljs-selector-attr,
.hljs-selector-pseudo { color: var(--code-number); }

.hljs-title,
.hljs-title.function_,
.hljs-function .hljs-title,
.hljs-selector-id,
.hljs-selector-class { color: var(--code-function); }

.hljs-type,
.hljs-class .hljs-title,
.hljs-title.class_,
.hljs-variable.language_ { color: var(--code-type); }

.hljs-attr,
.hljs-variable,
.hljs-template-variable,
.hljs-selector-tag { color: var(--code-attr); }

.hljs-built_in,
.hljs-builtin-name { color: var(--code-builtin); }

.hljs-meta,
.hljs-comment .hljs-doctag { color: var(--code-meta); }

.hljs-emphasis,
.hljs-strong { font-style: italic; }

.hljs-addition { background: var(--code-addition-bg); }
.hljs-deletion { color: var(--red); background: var(--code-deletion-bg); }

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  padding: 54px 0 0;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  gap: 48px;
  padding-bottom: 36px;
}

.footer-brand {
  max-width: 330px;
}

.footer-brand-row {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 8px;
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 700;
}

.footer-brand-row img,
.footer-brand-row svg {
  width: 26px;
  height: 26px;
  border-radius: 7px;
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 0.87rem;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 56px;
}

.footer-group h2 {
  margin-bottom: 10px;
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.footer-group a {
  display: block;
  padding: 3px 0;
  color: var(--text-secondary);
  font-size: 0.86rem;
}

.footer-group a:hover {
  color: var(--text);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 18px;
  padding: 18px 0;
  color: var(--text-muted);
  font-size: 0.79rem;
  border-top: 1px solid var(--border-subtle);
}

.footer-sep {
  margin: 0 5px;
  opacity: 0.5;
}

/* ==========================================================================
   404
   ========================================================================== */

.not-found {
  display: flex;
  align-items: center;
  min-height: 80vh;
  padding: calc(var(--nav-h) + 48px) 0 72px;
  text-align: center;
}

.not-found-code {
  font-size: clamp(4rem, 12vw, 8rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.06em;
  color: transparent;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.not-found h1 {
  margin: 14px 0 8px;
  font-size: 1.75rem;
  font-weight: 750;
}

.not-found p {
  margin-bottom: 26px;
  color: var(--text-secondary);
}

.not-found-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 1180px) {
  .docs-shell {
    grid-template-columns: 220px minmax(0, 1fr);
  }

  .docs-toc {
    display: none;
  }

  .toc-mobile {
    display: block;
  }

  .toc-mobile ul {
    display: grid;
    gap: 3px;
    padding: 0 15px 14px 30px;
    list-style: disc;
    color: var(--text-muted);
  }

  .toc-mobile a {
    font-size: 0.85rem;
  }
}

@media (max-width: 980px) {
  .nav-links {
    display: none;
  }

  .nav-mobile {
    display: block;
  }

  .nav-cta {
    display: none;
  }

  .docs-shell {
    display: block;
    padding-top: calc(var(--nav-h) + 26px);
  }

  .docs-sidebar {
    display: none;
  }

  .docs-mobile-nav {
    display: block;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .feature-hero {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px;
  }

  .safety-grid,
  .shortcuts-grid {
    grid-template-columns: 1fr;
  }

  .download-grid {
    grid-template-columns: 1fr;
  }

  .req-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-content {
    flex-direction: column;
    gap: 32px;
  }
}

@media (max-width: 760px) {
  :root {
    --nav-h: 58px;
  }

  .container {
    padding: 0 20px;
  }

  .docs-shell.container {
    padding-top: calc(var(--nav-h) + 22px);
  }

  .section {
    padding: 68px 0;
  }

  .hero {
    min-height: auto;
    padding: calc(var(--nav-h) + 48px) 0 56px;
  }

  .hero-title {
    font-size: 2.45rem;
  }

  .hero-desc {
    font-size: 1rem;
  }

  .hero-stats {
    gap: 18px 30px;
  }

  .stat-value {
    font-size: 1.45rem;
  }

  .logo-cn {
    display: none;
  }

  .features-grid,
  .formats-grid,
  .doc-cards {
    grid-template-columns: 1fr;
  }

  .facts {
    grid-template-columns: 1fr;
  }

  .feature-hero {
    padding: 22px;
  }

  .shortcuts-grid {
    gap: 16px;
  }

  .prose {
    font-size: 0.95rem;
  }

  .prose h2 {
    font-size: 1.32rem;
  }

  .docs-pager {
    grid-template-columns: 1fr;
  }

  .pager-spacer {
    display: none;
  }

  .footer-content {
    flex-direction: column;
    gap: 30px;
  }

  .footer-links {
    gap: 34px 48px;
  }
}

@media (max-width: 520px) {
  .hero-title {
    font-size: 2.05rem;
  }

  .hero-actions,
  .cta-actions {
    flex-direction: column;
  }

  .hero-actions .btn,
  .cta-actions .btn {
    width: 100%;
  }

  .req-grid {
    grid-template-columns: 1fr;
  }

  .nav-actions {
    gap: 6px;
  }

  .lang-switch {
    min-width: 36px;
    padding: 0 8px;
  }

  .theme-toggle {
    min-width: 36px;
    padding: 0 8px;
  }

  .docs-header h1 {
    font-size: 1.75rem;
  }
}

/* ==========================================================================
   Motion and print
   ========================================================================== */

@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;
    scroll-behavior: auto !important;
  }
}

@media print {
  .navbar,
  .footer,
  .docs-sidebar,
  .docs-toc,
  .docs-mobile-nav,
  .toc-mobile,
  .docs-pager,
  .code-copy,
  .skip-link {
    display: none !important;
  }

  html {
    scroll-padding-top: 0;
  }

  body {
    color: #000;
    background: #fff;
    font-size: 11pt;
  }

  .container,
  .docs-shell {
    display: block;
    max-width: none;
    padding: 0;
  }

  .docs-header {
    margin-bottom: 20px;
  }

  .prose {
    color: #222;
    font-size: 10.5pt;
  }

  .prose h2,
  .prose h3,
  .prose h4,
  .prose strong {
    color: #000;
  }

  .prose a {
    color: #000;
    text-decoration: underline;
  }

  .prose pre,
  .prose .table-wrap {
    border: 1px solid #ccc;
    background: #fff;
    break-inside: avoid;
  }

  .hljs {
    color: #000;
  }

  .heading-anchor {
    display: none;
  }
}