/* =========================================================
   GloriaCloud — 企业官网视觉系统
   浅色基底 / 克制品牌蓝 / 细边框 / 8pt 间距
   颜色、字号、间距、圆角、阴影、动效统一由令牌控制
   ========================================================= */

/* ---------- Design tokens ---------- */
:root {
  color-scheme: light;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* 品牌与中性色 */
  --color-brand-50: #eff6ff;
  --color-brand-100: #dbeafe;
  --color-brand-200: #bfdbfe;
  --color-brand-300: #93c5fd;
  --color-brand-500: #3b82f6;
  --color-brand-600: #1d4ed8;
  --color-brand-700: #1e40af;
  --color-brand-800: #1e3a8a;

  --color-ink-950: #0b1220;
  --color-ink-900: #101828;
  --color-ink-800: #1d2939;
  --color-ink-700: #344054;
  --color-ink-600: #475467;
  --color-ink-500: #667085;
  --color-ink-400: #98a2b3;
  --color-ink-300: #d0d5dd;
  --color-ink-200: #e4e7ec;
  --color-ink-100: #f2f4f7;
  --color-ink-50: #f8fafc;

  --color-canvas: #f7f8fa;
  --color-surface: #ffffff;
  --color-surface-subtle: #f4f6fa;
  --color-surface-raised: #ffffff;

  --color-heading: #101828;
  --color-text: #475467;
  --color-text-muted: #667085;
  --color-text-subtle: #98a2b3;

  --color-border: #e4e7ec;
  --color-border-strong: #d0d5dd;

  --color-primary: #1d4ed8;
  --color-primary-hover: #1e40af;
  --color-primary-soft: #eff6ff;
  --color-action: #1d4ed8;
  --color-action-hover: #1e40af;
  --color-on-action: #ffffff;
  --color-focus: #2563eb;

  --color-success: #067647;
  --color-success-soft: #ecfdf3;
  --color-warning: #b54708;
  --color-warning-soft: #fffaeb;
  --color-danger: #b42318;
  --color-danger-soft: #fef3f2;

  --color-footer: #0b1220;
  --color-footer-text: #98a2b3;
  --color-footer-heading: #f2f4f7;
  --color-footer-border: rgba(255, 255, 255, 0.09);

  /* 间距（8pt 体系，4pt 作为最小刻度） */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 40px;
  --space-8: 48px;
  --space-9: 56px;
  --space-10: 64px;
  --space-11: 72px;
  --space-12: 80px;
  --space-14: 96px;
  --space-16: 112px;
  --space-18: 128px;

  /* 圆角 */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-pill: 999px;

  /* 阴影：只在需要分层时使用 */
  --shadow-xs: 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow-sm: 0 1px 3px rgba(16, 24, 40, 0.08), 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-md: 0 8px 24px rgba(16, 24, 40, 0.07);
  --shadow-lg: 0 18px 48px rgba(16, 24, 40, 0.1);

  /* 动效 */
  --duration-fast: 120ms;
  --duration: 180ms;
  --duration-slow: 240ms;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);

  /* 布局 */
  --container: 1200px;
  --gutter: 32px;
  --nav-height: 72px;

  /* 旧变量别名，保证存量页面/脚本平滑过渡 */
  --primary: var(--color-primary);
  --primary-dark: var(--color-primary-hover);
  --secondary: #0f766e;
  --gradient: var(--color-primary);
  --dark: var(--color-ink-950);
  --light: var(--color-ink-50);
  --gray: var(--color-text-muted);
  --gray-light: var(--color-border);
  --bg-primary: var(--color-canvas);
  --bg-secondary: var(--color-surface);
  --bg-card: var(--color-surface-subtle);
  --text-primary: var(--color-heading);
  --text-secondary: var(--color-text);
  --text-tertiary: var(--color-text-subtle);
  --border-color: var(--color-border);
  --shadow-color: rgba(16, 24, 40, 0.08);
  --nav-bg: var(--color-surface);
  --primary-color: var(--color-primary);
  --secondary-color: var(--color-primary-hover);
}

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

  --color-canvas: #0b1220;
  --color-surface: #111827;
  --color-surface-subtle: #0f172a;
  --color-surface-raised: #162033;

  --color-heading: #f2f4f7;
  --color-text: #cbd5e1;
  --color-text-muted: #98a2b3;
  --color-text-subtle: #7d899b;

  --color-border: #1f2a3a;
  --color-border-strong: #2b3a50;

  --color-primary: #93c5fd;
  --color-primary-hover: #bfdbfe;
  --color-primary-soft: rgba(37, 99, 235, 0.16);
  --color-action: #2563eb;
  --color-action-hover: #1d4ed8;
  --color-on-action: #ffffff;
  --color-focus: #93c5fd;

  --color-brand-50: rgba(37, 99, 235, 0.16);
  --color-brand-100: rgba(37, 99, 235, 0.24);
  --color-brand-200: rgba(96, 165, 250, 0.34);
  --color-brand-300: #93c5fd;

  --color-success: #75e0a7;
  --color-success-soft: rgba(6, 118, 71, 0.2);
  --color-warning: #fdb022;
  --color-warning-soft: rgba(181, 71, 8, 0.2);
  --color-danger: #fda29b;
  --color-danger-soft: rgba(180, 35, 24, 0.2);

  --color-footer: #070d18;
  --color-footer-text: #98a2b3;
  --color-footer-heading: #f2f4f7;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.24);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.28);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.36);

  --bg-primary: var(--color-canvas);
  --bg-secondary: var(--color-surface);
  --bg-card: var(--color-surface-subtle);
  --text-primary: var(--color-heading);
  --text-secondary: var(--color-text);
  --text-tertiary: var(--color-text-subtle);
  --border-color: var(--color-border);
  --shadow-color: rgba(0, 0, 0, 0.28);
  --nav-bg: var(--color-surface);
}

/* ---------- Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 24px);
}

body {
  margin: 0;
  padding-top: var(--nav-height);
  overflow-x: clip;
  background: var(--color-canvas);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--duration) var(--ease), color var(--duration) var(--ease);
}

main {
  display: block;
}

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

img {
  display: block;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  color: var(--color-heading);
  font-weight: 650;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

p {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

li {
  margin: 0;
}

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

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

button {
  color: inherit;
}

table {
  border-collapse: collapse;
  width: 100%;
}

iframe {
  border: 0;
}

::selection {
  background: var(--color-brand-100);
  color: var(--color-heading);
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 2000;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--color-action);
  color: var(--color-on-action);
  font-size: 14px;
  font-weight: 600;
  transform: translateY(-160%);
  transition: transform var(--duration) var(--ease);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--space-14);
}

.section--tight {
  padding-block: var(--space-11);
}

.section--subtle {
  background: var(--color-surface-subtle);
  border-block: 1px solid var(--color-border);
}

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

.text-center {
  text-align: center;
}

/* ---------- Typography helpers ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--space-4);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.12em;
  line-height: 1.4;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 16px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}

.section-head {
  max-width: 760px;
  margin-bottom: var(--space-8);
}

.section-head.is-center {
  margin-inline: auto;
  text-align: center;
}

.section-head.is-center .eyebrow {
  justify-content: center;
}

.section-head--split {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-6);
  max-width: none;
}

.section-title {
  font-size: clamp(28px, 3vw, 36px);
  line-height: 1.2;
}

.section-lead {
  max-width: 680px;
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  font-size: 16px;
  line-height: 1.8;
}

.page-title {
  font-size: clamp(32px, 4vw, 44px);
  line-height: 1.15;
}

.page-lead {
  max-width: 720px;
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  font-size: 16px;
  line-height: 1.8;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-heading);
  font-size: 14px;
  font-weight: 650;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--duration) var(--ease),
    border-color var(--duration) var(--ease), color var(--duration) var(--ease),
    box-shadow var(--duration) var(--ease);
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.btn-primary {
  border-color: var(--color-action);
  background: var(--color-action);
  color: var(--color-on-action);
  box-shadow: var(--shadow-xs);
}

.btn-primary:hover {
  border-color: var(--color-action-hover);
  background: var(--color-action-hover);
}

.btn-secondary {
  border-color: var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-heading);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.btn-ghost {
  border-color: transparent;
  color: var(--color-primary);
}

.btn-ghost:hover {
  background: var(--color-primary-soft);
}

.btn-outline {
  border-color: var(--color-border-strong);
  background: transparent;
  color: var(--color-heading);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-sm {
  min-height: 36px;
  padding: 7px 14px;
  font-size: 13px;
}

.btn-lg {
  min-height: 48px;
  padding: 12px 24px;
  font-size: 15px;
}

.btn-block {
  width: 100%;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.6;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 600;
}

.link-arrow::after {
  content: "→";
  transition: transform var(--duration) var(--ease);
}

.link-arrow:hover::after {
  transform: translateX(3px);
}

/* ---------- Header / navigation ---------- */
.navbar {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 1000;
  height: var(--nav-height);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  transition: box-shadow var(--duration) var(--ease),
    background-color var(--duration) var(--ease);
}

.navbar.is-scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-container {
  position: relative;
  display: grid;
  grid-template-columns: minmax(160px, 1fr) auto minmax(160px, 1fr);
  align-items: center;
  width: 100%;
  max-width: var(--container);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  justify-self: start;
  color: var(--color-heading);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}

.logo-img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  object-fit: contain;
}

.logo-text {
  color: var(--color-heading);
  background: none;
  -webkit-text-fill-color: currentColor;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 4px 0;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
  transition: color var(--duration) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 2px;
  left: 0;
  height: 2px;
  border-radius: 1px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--duration) var(--ease);
}

.nav-link:hover {
  color: var(--color-heading);
}

.nav-link:hover::after,
.nav-link.is-active::after {
  transform: scaleX(1);
}

.nav-link.is-active {
  color: var(--color-heading);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  justify-self: end;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background-color var(--duration) var(--ease),
    border-color var(--duration) var(--ease), color var(--duration) var(--ease);
}

.theme-toggle:hover {
  border-color: var(--color-border-strong);
  background: var(--color-surface-subtle);
  color: var(--color-heading);
}

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

.sun-icon {
  display: none;
}

.moon-icon {
  display: block;
}

[data-theme="dark"] .sun-icon {
  display: block;
}

[data-theme="dark"] .moon-icon {
  display: none;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-heading);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  border-radius: 1px;
  background: currentColor;
  transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
}

.nav-toggle.is-active span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-active span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-12) 0 var(--space-10);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(to right, var(--color-border) 1px, transparent 1px),
    linear-gradient(to bottom, var(--color-border) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.38;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 82%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 82%);
}

[data-theme="dark"] .hero::before {
  opacity: 0.16;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  align-items: center;
  gap: var(--space-10);
}

.hero-copy {
  max-width: 620px;
}

.hero-title {
  margin-bottom: var(--space-4);
}

.hero-brand {
  display: block;
  margin-bottom: 14px;
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 650;
  letter-spacing: 0.18em;
  line-height: 1.4;
  text-transform: uppercase;
}

.hero-title-cn {
  display: block;
  color: var(--color-heading);
  font-size: clamp(38px, 5vw, 58px);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.06;
}

.hero-lead {
  color: var(--color-heading);
  font-size: clamp(20px, 2.2vw, 24px);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.45;
}

.hero-desc {
  max-width: 570px;
  margin-top: var(--space-4);
  color: var(--color-text-muted);
  font-size: 16px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: var(--space-5);
  list-style: none;
  color: var(--color-text-muted);
  font-size: 13px;
}

.hero-points li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.hero-points li::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--color-primary);
}

.hero-visual {
  position: relative;
  min-width: 0;
}

.product-frame {
  overflow: hidden;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
}

.product-frame-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 42px;
  padding: 0 14px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-subtle);
}

.product-frame-title {
  overflow: hidden;
  color: var(--color-text);
  font-size: 12px;
  font-weight: 500;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.product-frame-meta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-subtle);
  font-size: 11px;
  white-space: nowrap;
}

.product-frame-meta::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-border-strong);
}

.product-frame-media {
  background: var(--color-ink-100);
}

.product-frame-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

[data-theme="dark"] .product-frame-media {
  background: var(--color-ink-900);
}

.product-caption {
  margin-top: 12px;
  color: var(--color-text-subtle);
  font-size: 12px;
  line-height: 1.6;
  text-align: right;
}

/* ---------- Facts strip ---------- */
.facts {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.facts-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  padding-block: var(--space-5);
}

.fact {
  padding-inline: var(--space-6);
  border-left: 1px solid var(--color-border);
}

.fact:first-child {
  padding-left: 0;
  border-left: 0;
}

.fact-value {
  display: block;
  color: var(--color-heading);
  font-size: 26px;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.fact-label {
  display: block;
  margin-top: 4px;
  color: var(--color-text-muted);
  font-size: 12px;
  line-height: 1.5;
}

/* ---------- Capabilities ---------- */
.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--color-border);
}

.capability {
  padding: var(--space-6) var(--space-6) var(--space-2);
  border-right: 1px solid var(--color-border);
}

.capability:first-child {
  padding-left: 0;
}

.capability:last-child {
  padding-right: 0;
  border-right: 0;
}

.capability-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: var(--space-5);
}

.capability-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-brand-100);
  border-radius: var(--radius-sm);
  background: var(--color-brand-50);
  color: var(--color-primary);
}

.capability-icon svg {
  width: 20px;
  height: 20px;
}

.capability-index {
  color: var(--color-text-subtle);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.capability h3 {
  margin-bottom: var(--space-2);
  font-size: 20px;
}

.capability p {
  color: var(--color-text-muted);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- Platform ---------- */
.platform-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  align-items: center;
  gap: var(--space-10);
}

.platform-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.platform-table {
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.platform-name {
  color: var(--color-heading);
  font-weight: 600;
}

.platform-action {
  justify-self: end;
}

.platform-note {
  margin-top: var(--space-4);
  color: var(--color-text-muted);
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
}

.contact-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.contact-card.is-featured {
  border-color: var(--color-brand-200);
  box-shadow: var(--shadow-xs);
}

.contact-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.contact-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-brand-100);
  border-radius: var(--radius-sm);
  background: var(--color-brand-50);
  color: var(--color-primary);
}

.contact-icon svg {
  width: 22px;
  height: 22px;
}

.contact-tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 10px;
  border: 1px solid var(--color-brand-200);
  border-radius: var(--radius-pill);
  background: var(--color-brand-50);
  color: var(--color-primary);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.contact-card h3 {
  margin-bottom: var(--space-2);
  font-size: 19px;
}

.contact-name {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.7;
}

.contact-qq {
  margin: 14px 0 var(--space-5);
  color: var(--color-heading);
  font-size: 20px;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.contact-card .btn {
  align-self: flex-start;
  margin-top: auto;
}

.notice {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin-top: var(--space-5);
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-subtle);
}

.notice-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  color: var(--color-primary);
}

.notice-icon svg {
  width: 20px;
  height: 20px;
}

.notice h4 {
  margin-bottom: var(--space-2);
  font-size: 15px;
}

.notice p {
  max-width: 900px;
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.8;
}

/* ---------- Inner page shell ---------- */
.page-head {
  padding: var(--space-8) 0 var(--space-7);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.page-head-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-6);
}

.page-head .eyebrow {
  margin-bottom: var(--space-3);
}

.page-head .page-title {
  margin-bottom: var(--space-3);
}

.page-head-actions {
  display: flex;
  flex-shrink: 0;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-bottom: 4px;
}

.page-body {
  padding-block: var(--space-9) var(--space-14);
}

.page-narrow {
  max-width: 840px;
  margin-inline: auto;
}

.panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.panel-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.panel-body {
  padding: var(--space-6);
}

.page-toc {
  position: sticky;
  top: calc(var(--nav-height) + 32px);
  align-self: start;
}

.page-toc-title {
  margin-bottom: var(--space-3);
  color: var(--color-text-subtle);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.page-toc ul {
  display: flex;
  flex-direction: column;
  gap: 2px;
  list-style: none;
}

.page-toc a {
  display: block;
  padding: 7px 0 7px 12px;
  border-left: 2px solid transparent;
  color: var(--color-text-muted);
  font-size: 13px;
  line-height: 1.5;
  transition: color var(--duration) var(--ease),
    border-color var(--duration) var(--ease);
}

.page-toc a:hover {
  border-left-color: var(--color-border-strong);
  color: var(--color-heading);
}

/* ---------- Prose / legal ---------- */
.prose {
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.85;
}

.prose h2 {
  margin: var(--space-9) 0 var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: 22px;
  line-height: 1.35;
}

.prose h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.prose h3 {
  margin: var(--space-6) 0 var(--space-3);
  font-size: 17px;
}

.prose p {
  margin-bottom: var(--space-4);
}

.prose ul,
.prose ol {
  margin: var(--space-3) 0 var(--space-5);
  padding-left: 22px;
}

.prose li {
  margin-bottom: 8px;
}

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

.prose a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose-date {
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-subtle);
  font-size: 13px;
}

.callout {
  margin: var(--space-6) 0;
  padding: var(--space-5);
  border: 1px solid var(--color-brand-100);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--color-brand-50);
  color: var(--color-heading);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- Footer ---------- */
.footer {
  padding: var(--space-10) 0 var(--space-5);
  background: var(--color-footer);
  color: var(--color-footer-text);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
  gap: var(--space-10);
  padding-bottom: var(--space-7);
  border-bottom: 1px solid var(--color-footer-border);
}

.footer .logo {
  color: var(--color-footer-heading);
}

.footer .logo-text {
  color: var(--color-footer-heading);
}

.footer-tagline {
  margin-top: var(--space-3);
  color: var(--color-footer-text);
  font-size: 14px;
}

.footer-warning {
  max-width: 760px;
  margin-top: var(--space-5);
  padding-left: var(--space-4);
  border-left: 2px solid rgba(255, 255, 255, 0.14);
  color: #aab4c3;
  font-size: 12px;
  line-height: 1.85;
  text-align: justify;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
}

.footer-links h4 {
  margin-bottom: var(--space-4);
  color: var(--color-footer-heading);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
}

.footer-links a {
  color: var(--color-footer-text);
  font-size: 13px;
  line-height: 1.6;
  transition: color var(--duration) var(--ease);
}

.footer-links a:hover {
  color: var(--color-footer-heading);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-5);
  color: var(--color-footer-text);
  font-size: 12px;
}

/* ---------- AI assistant ---------- */
.ai-chat-widget {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 950;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  pointer-events: none;
}

.ai-chat-fab {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 1px solid var(--color-action);
  border-radius: 50%;
  background: var(--color-action);
  color: var(--color-on-action);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  pointer-events: auto;
  transition: background-color var(--duration) var(--ease),
    box-shadow var(--duration) var(--ease);
}

.ai-chat-fab:hover {
  background: var(--color-action-hover);
  box-shadow: var(--shadow-lg);
}

.ai-chat-fab svg {
  position: absolute;
  width: 22px;
  height: 22px;
  transition: opacity var(--duration) var(--ease),
    transform var(--duration) var(--ease);
}

.ai-fab-icon {
  opacity: 1;
  transform: rotate(0) scale(1);
}

.ai-fab-close {
  opacity: 0;
  transform: rotate(-45deg) scale(0.8);
}

.ai-chat-widget.open .ai-fab-icon {
  opacity: 0;
  transform: rotate(45deg) scale(0.8);
}

.ai-chat-widget.open .ai-fab-close {
  opacity: 1;
  transform: rotate(0) scale(1);
}

.ai-chat-window {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  width: 380px;
  height: 560px;
  max-height: calc(100vh - 100px);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(8px) scale(0.98);
  transform-origin: bottom right;
  transition: opacity var(--duration) var(--ease),
    transform var(--duration) var(--ease), visibility var(--duration);
}

.ai-chat-widget.open .ai-chat-window {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.ai-chat-header {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.ai-chat-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-brand-100);
  border-radius: var(--radius-sm);
  background: var(--color-brand-50);
  color: var(--color-primary);
}

.ai-chat-avatar svg {
  width: 20px;
  height: 20px;
}

.ai-chat-title-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.ai-chat-title {
  color: var(--color-heading);
  font-size: 14px;
  font-weight: 650;
}

.ai-chat-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-muted);
  font-size: 11px;
  line-height: 1.4;
}

.ai-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
}

.ai-status-dot.offline {
  background: var(--color-danger);
}

.ai-status-dot.checking {
  background: var(--color-warning);
}

.ai-chat-messages {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
  padding: 16px;
  background: var(--color-canvas);
  scroll-behavior: smooth;
}

.ai-chat-messages::-webkit-scrollbar {
  width: 6px;
}

.ai-chat-messages::-webkit-scrollbar-thumb {
  border-radius: 3px;
  background: var(--color-border-strong);
}

.ai-message {
  display: flex;
  gap: 10px;
  max-width: 100%;
}

.ai-message-user {
  flex-direction: row-reverse;
}

.ai-message-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
}

.ai-message-bot .ai-message-avatar {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-primary);
}

.ai-message-user .ai-message-avatar {
  border: 1px solid var(--color-border);
  background: var(--color-surface-subtle);
  color: var(--color-text-muted);
}

.ai-message-avatar svg {
  width: 16px;
  height: 16px;
}

.ai-message-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: calc(100% - 44px);
}

.ai-message-user .ai-message-content {
  align-items: flex-end;
}

.ai-message-bubble {
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 13px;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.ai-message-bot .ai-message-bubble {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-top-left-radius: 2px;
}

.ai-message-user .ai-message-bubble {
  background: var(--color-action);
  color: var(--color-on-action);
  border-top-right-radius: 2px;
}

.ai-message-time {
  padding-inline: 2px;
  color: var(--color-text-subtle);
  font-size: 10px;
  line-height: 1.4;
}

.ai-message-bubble strong {
  font-weight: 650;
}

.ai-message-bubble code {
  display: inline-block;
  margin-inline: 1px;
  padding: 1px 5px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  background: var(--color-surface-subtle);
  font-family: var(--font-mono);
  font-size: 0.9em;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.ai-message-bubble a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.ai-message-user .ai-message-bubble code {
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
}

.ai-message-user .ai-message-bubble a {
  color: #ffffff;
}

.ai-typing-indicator {
  display: flex;
  gap: 4px;
  padding: 4px 2px;
}

.ai-typing-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-text-subtle);
  animation: aiTyping 1.2s infinite var(--ease);
}

.ai-typing-dot:nth-child(2) {
  animation-delay: 0.15s;
}

.ai-typing-dot:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes aiTyping {
  0%,
  60%,
  100% {
    transform: translateY(0);
    opacity: 0.4;
  }
  30% {
    transform: translateY(-3px);
    opacity: 1;
  }
}

.ai-chat-input-area {
  flex-shrink: 0;
  padding: 12px 16px 14px;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.ai-chat-input-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 3px 3px 12px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  transition: border-color var(--duration) var(--ease),
    box-shadow var(--duration) var(--ease);
}

.ai-chat-input-wrapper:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.ai-chat-input {
  flex: 1;
  min-width: 0;
  padding: 8px 0;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--color-heading);
  font-size: 13px;
  line-height: 1.5;
}

.ai-chat-input::placeholder {
  color: var(--color-text-subtle);
}

.ai-chat-send {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 0;
  border-radius: var(--radius-xs);
  background: var(--color-action);
  color: var(--color-on-action);
  cursor: pointer;
  transition: background-color var(--duration) var(--ease);
}

.ai-chat-send:hover:not(:disabled) {
  background: var(--color-action-hover);
}

.ai-chat-send:disabled {
  cursor: not-allowed;
  opacity: 0.4;
}

.ai-chat-send svg {
  width: 16px;
  height: 16px;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  :root {
    --gutter: 24px;
  }

  .hero-grid {
    gap: var(--space-8);
  }

  .platform-grid {
    gap: var(--space-8);
  }

  .footer-grid {
    gap: var(--space-8);
  }
}

@media (max-width: 900px) {
  .nav-container {
    grid-template-columns: 1fr auto;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-2) var(--gutter) var(--space-4);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
  }

  .nav-menu.is-open {
    display: flex;
  }

  .nav-menu li + li {
    border-top: 1px solid var(--color-border);
  }

  .nav-link {
    min-height: 48px;
  }

  .nav-link::after {
    display: none;
  }

  .nav-link.is-active {
    color: var(--color-primary);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .hero-grid,
  .platform-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-copy {
    max-width: 680px;
  }

  .hero-visual {
    max-width: 680px;
  }

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

  .capability {
    padding: var(--space-5) 0;
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }

  .capability:first-child {
    padding-top: 0;
  }

  .capability:last-child {
    padding-bottom: 0;
    border-bottom: 0;
  }

  .facts-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: var(--space-5);
  }

  .fact {
    padding-inline: var(--space-5);
  }

  .fact:nth-child(odd) {
    padding-left: 0;
    border-left: 0;
  }

  .fact:nth-child(n + 3) {
    padding-top: var(--space-5);
    border-top: 1px solid var(--color-border);
  }

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

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

  .page-head-inner,
  .section-head--split {
    align-items: flex-start;
    flex-direction: column;
  }

  .page-head-actions {
    width: 100%;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 20px;
  }

  body {
    font-size: 15px;
  }

  .section {
    padding-block: var(--space-11);
  }

  .hero {
    padding-top: var(--space-9);
  }

  .hero-title-cn {
    font-size: 38px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

  .hero-points {
    gap: 8px 16px;
  }

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

  .fact,
  .fact:nth-child(odd) {
    padding: 14px 0;
    border-top: 1px solid var(--color-border);
    border-left: 0;
  }

  .fact:first-child {
    padding-top: 0;
    border-top: 0;
  }

  .notice {
    flex-direction: column;
    gap: 12px;
  }

  .page-head {
    padding-top: var(--space-7);
  }

  .page-body {
    padding-block: var(--space-8) var(--space-12);
  }

  .footer-links {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-5);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .ai-chat-widget {
    right: 12px;
    bottom: 12px;
    left: 12px;
  }

  .ai-chat-window {
    width: 100%;
    height: min(560px, calc(100vh - 88px));
    max-height: calc(100vh - 88px);
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 16px;
  }

  .logo-img {
    width: 26px;
    height: 26px;
  }

  .hero-title-cn {
    font-size: 34px;
  }

  .hero-lead {
    font-size: 19px;
  }

  .contact-card {
    padding: var(--space-5);
  }

  .ai-chat-header {
    padding: 12px 14px;
  }
}

/* ---------- Reduced motion ---------- */
@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;
  }

  .ai-chat-window,
  .ai-chat-fab svg,
  .nav-link::after,
  .link-arrow::after,
  .skip-link {
    transform: none !important;
  }
}