:root {
  color-scheme: light dark;

  /* ===== SyncNos WebClipper tokens (copied) ===== */
  --bg-primary: rgb(250 251 252);
  --bg-sunken: rgb(255 255 255);
  --bg-card: rgb(255 255 255);
  --bg-overlay: rgba(0, 0, 0, 0.42);

  --text-primary: rgb(52 46 40);
  --text-secondary: rgb(113 101 89);

  --accent: rgb(246 196 166);
  --accent-foreground: rgb(62 45 36);
  --accent-hover: rgba(246, 196, 166, 0.86);
  --accent-active: rgb(234 182 150);
  --secondary: rgb(123 196 160);
  --secondary-foreground: rgb(26 43 34);
  --tertiary: rgb(232 200 106);
  --tertiary-foreground: rgb(44 48 56);

  --error: rgb(229 62 62);
  --error-foreground: rgb(255 255 255);
  --warning: rgb(214 158 46);
  --warning-foreground: rgb(44 48 56);
  --success: rgb(56 161 105);
  --success-foreground: rgb(255 255 255);
  --info: rgb(49 130 206);
  --info-foreground: rgb(255 255 255);

  --border: rgb(210 216 226);
  --focus-ring: var(--accent);
  --card-shadow: 0 10px 24px rgb(0 0 0 / 10%);
  --surface-inset-highlight: rgb(255 255 255 / 55%);

  --markdown-font-medium:
    'Charter', 'Iowan Old Style', 'Palatino Linotype', 'Georgia', 'Noto Serif CJK SC', 'Source Han Serif SC',
    'Songti SC', serif;
  --markdown-font-notion:
    ui-sans-serif, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Noto Sans CJK SC', 'Source Han Sans SC',
    'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;

  --radius-outer: 24px;
  --radius-card: 20px;
  --radius-control: 12px;
  --radius-chip: 10px;
  --radius-inline: 8px;
  --radius-pill: 999px;

  --page-max: 1120px;
  --page-gutter: 24px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: rgb(26 28 32);
    --bg-sunken: rgb(20 22 24);
    --bg-card: rgb(38 40 48);
    --bg-overlay: rgba(0, 0, 0, 0.65);

    --text-primary: rgb(220 224 232);
    --text-secondary: rgb(139 145 154);

    --accent: rgb(255 212 194);
    --accent-foreground: rgb(26 28 32);
    --accent-hover: rgba(255, 212, 194, 0.85);
    --accent-active: rgb(240 198 180);
    --secondary: rgb(106 175 142);
    --secondary-foreground: rgb(26 28 32);
    --tertiary: rgb(212 184 94);
    --tertiary-foreground: rgb(26 28 32);

    --error: rgb(252 129 129);
    --error-foreground: rgb(26 28 32);
    --warning: rgb(236 201 75);
    --warning-foreground: rgb(26 28 32);
    --success: rgb(104 211 145);
    --success-foreground: rgb(26 28 32);
    --info: rgb(99 179 237);
    --info-foreground: rgb(26 28 32);

    --border: rgb(54 56 64);
    --card-shadow: 0 12px 28px rgb(0 0 0 / 36%);
    --surface-inset-highlight: rgb(255 255 255 / 14%);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg-primary);
  color: var(--text-primary);
  font: 15px/1.65 var(--markdown-font-notion);
  letter-spacing: 0.01em;
  text-rendering: geometricPrecision;
}

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

a:hover {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.container {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--page-gutter);
}

.sn-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg-primary) 88%, transparent);
  backdrop-filter: blur(10px) saturate(150%);
  border-bottom: 1px solid var(--border);
}

.sn-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-inline);
  border: 1px solid var(--border);
  background: var(--bg-card);
  display: grid;
  place-items: center;
  overflow: hidden;
}

.brand-mark img {
  width: 100%;
  height: 100%;
  display: block;
}

.brand-title {
  font-weight: 950;
  letter-spacing: -0.015em;
  font-size: 14px;
  line-height: 1.1;
}

.brand-subtitle {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.2;
  margin-top: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 42vw;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
}

@media (max-width: 860px) {
  .nav-links {
    gap: 10px;
    flex: 1;
    justify-content: flex-end;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 6px 0;
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-link {
    white-space: nowrap;
  }
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 850;
  font-size: 13px;
}

.lang-pill {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-card) 88%, transparent);
  backdrop-filter: blur(8px);
}

.lang-pill button {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 6px 10px;
  font: inherit;
  font-size: 12px;
  font-weight: 900;
  border-radius: var(--radius-pill);
  cursor: pointer;
}

.lang-pill button[aria-pressed='true'] {
  background: var(--bg-sunken);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.sn-btn {
  appearance: none;
  font: inherit;
  text-decoration: none;
  user-select: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 38px;
  padding: 0 14px;
  border-radius: var(--radius-chip);
  cursor: pointer;
  font-size: 13px;
  font-weight: 900;
  line-height: 1;
  --btn-surface: var(--bg-card);
  --btn-stroke-tl: color-mix(in srgb, var(--btn-surface) 62%, white);
  --btn-stroke-br: color-mix(in srgb, var(--btn-surface) 74%, black);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow:
    inset 1px 1px 0 var(--btn-stroke-tl),
    inset -1px -1px 0 var(--btn-stroke-br);
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    box-shadow 120ms ease,
    transform 120ms ease,
    opacity 160ms ease;
}

.sn-btn:hover {
  text-decoration: none;
}

.sn-btn:active {
  box-shadow:
    inset 1px 1px 0 var(--btn-stroke-br),
    inset -1px -1px 0 var(--btn-stroke-tl);
  transform: translateY(1px);
}

.sn-btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.sn-btn--filled {
  --btn-surface: var(--accent);
  border: 0;
  background: var(--accent);
  color: var(--accent-foreground);
  box-shadow: none;
}

.sn-btn--filled:hover {
  background: var(--accent-hover);
}

.sn-btn--filled:active {
  background: var(--accent-active);
}

.sn-btn--ghost {
  background: color-mix(in srgb, var(--bg-card) 88%, transparent);
  backdrop-filter: blur(8px);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--bg-card);
  font-size: 12px;
  font-weight: 850;
  color: var(--text-secondary);
}

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

.section {
  padding: 56px 0;
}

.section-title {
  font-family: var(--markdown-font-medium);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
}

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

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

@media (max-width: 980px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

.shot {
  width: 100%;
  display: block;
  border-radius: var(--radius-card);
  border: 1px solid var(--border);
  background: var(--bg-sunken);
  box-shadow: 0 14px 28px rgb(0 0 0 / 12%);
}

/* ===== Demo A layout primitives ===== */
.hero {
  padding: 44px 0 28px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  gap: 22px;
  align-items: center;
}

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
}

.hero h1 {
  font-family: var(--markdown-font-medium);
  letter-spacing: -0.02em;
  margin: 14px 0 14px;
  font-size: 48px;
  line-height: 1.05;
}

@media (max-width: 520px) {
  .hero h1 {
    font-size: 40px;
  }
}

.hero p.lede {
  margin: 0;
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.65;
  max-width: 62ch;
}

.hero-actions {
  margin-top: 18px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.proof {
  display: grid;
  gap: 12px;
}

.stack {
  position: relative;
  padding: 14px;
  border-radius: var(--radius-outer);
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: var(--card-shadow);
}

.stack .shot.primary {
  border-radius: var(--radius-card);
}

.stack .shot.secondary {
  width: min(72%, 520px);
  position: absolute;
  right: 12px;
  bottom: 12px;
  border-radius: var(--radius-control);
  transform: rotate(0.4deg);
  box-shadow: 0 18px 44px rgb(0 0 0 / 18%);
}

.kpis {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

@media (max-width: 520px) {
  .kpis {
    grid-template-columns: 1fr;
  }
}

.kpi {
  border-radius: var(--radius-card);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-card) 88%, transparent);
  padding: 12px 14px;
}

.kpi .label {
  font-size: 12px;
  font-weight: 900;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.kpi .value {
  margin-top: 6px;
  font-size: 13px;
  font-weight: 850;
  line-height: 1.45;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

@media (max-width: 980px) {
  .split {
    grid-template-columns: 1fr;
  }
}

.list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.list li {
  padding: 10px 12px;
  border-radius: var(--radius-control);
  border: 1px solid var(--border);
  background: var(--bg-card);
  display: grid;
  gap: 4px;
}

.list .t {
  font-weight: 950;
  font-size: 13px;
}

.list .d {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.55;
}

.products {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

@media (max-width: 980px) {
  .products {
    grid-template-columns: 1fr;
  }
}

.p-card {
  padding: 14px;
}

.p-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.p-title {
  font-weight: 950;
  font-size: 14px;
}

.p-desc {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.6;
  margin-top: 10px;
}

.p-actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.crumbs {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-secondary);
}

.crumbs a {
  color: inherit;
  font-weight: 900;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 26px 0 40px;
  color: var(--text-secondary);
  font-size: 13px;
}

.footer-inner {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.fineprint {
  max-width: 70ch;
  line-height: 1.55;
}

.lang-en,
.lang-zh {
  display: none;
}

html[data-lang='en'] .lang-en {
  display: block;
}

html[data-lang='zh'] .lang-zh {
  display: block;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
    scroll-behavior: auto !important;
  }
}