@charset "UTF-8";
/* ==========================================================================
   未知未尽科技 WEIZHI AI — 主样式表 V1.0
   纯静态站点样式：设计令牌 → reset → 基础 → 组件 → 区块 → 工具 → 媒体查询
   命名规范：BEM（.block / .block__element / .block--modifier / .is-state）
   所有颜色/字号/间距只允许引用本节令牌，禁止裸色值（渐变装饰除外）
   ========================================================================== */

/* ===== 1. 设计令牌 ===== */
:root {
  /* 背景层 */
  --bg: #05070C;
  --bg-elevated: #070A11;
  --surface: #0B1018;
  --surface-2: #121A26;

  /* 分隔线 / 描边 */
  --line: rgba(255, 255, 255, .08);
  --line-2: rgba(255, 255, 255, .14);

  /* 文字层 */
  --text: #fff;
  --text-2: rgba(255, 255, 255, .72);
  --text-3: rgba(255, 255, 255, .45);

  /* 品牌色（蓝 / 青蓝 / 蓝紫） */
  --brand: #2E7CF6;
  --cyan: #22D3EE;
  --violet: #6366F1;
  --brand-soft: rgba(46, 124, 246, .10);
  --grad: linear-gradient(120deg, #2E7CF6, #22D3EE 60%, #6366F1);

  /* 功能色 */
  --success: #22C55E;
  --error: #F87171;

  /* 阴影（一律低透明黑，禁止彩色大模糊发光） */
  --shadow: 0 8px 32px rgba(0, 0, 0, .45);
  --shadow-sm: 0 1px 0 rgba(255, 255, 255, .03), 0 8px 24px -12px rgba(0, 0, 0, .8);

  /* 字号阶梯（clamp 流式） */
  --fs-hero: clamp(2.2rem, 6vw, 4.5rem);
  --fs-h1: clamp(1.9rem, 4.2vw, 3rem);
  --fs-h2: clamp(1.5rem, 3vw, 2.25rem);
  --fs-h3: clamp(1.15rem, 1.6vw, 1.375rem);
  --fs-lead: clamp(1rem, 1.5vw, 1.2rem);
  --fs-body: 1rem;
  --fs-sm: .875rem;
  --fs-xs: .75rem;

  /* 间距阶梯（8px 基准，1=4px） */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 64px;
  --sp-9: 96px;
  --sp-10: 128px;

  /* 圆角 */
  --r-sm: 12px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-pill: 999px;

  /* 容器与骨架 */
  --container: 1200px;
  --gutter: clamp(16px, 5vw, 32px);
  --nav-h: 64px;

  /* 字体栈（不引入外部字体，首屏零字体请求） */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 层级 */
  --z-header: 100;
  --z-drawer: 200;
  --z-backdrop: 0;

  /* 动效 */
  --dur-fast: 150ms;
  --dur-base: 240ms;
  --dur-slow: 600ms;
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --ease-inout: cubic-bezier(.4, 0, .2, 1);
}

/* ===== 2. Reset 与基础 ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* 微信内点击高亮去除 */
body,
a,
button {
  -webkit-tap-highlight-color: transparent;
}

h1,
h2,
h3,
h4,
h5,
h6,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: var(--text);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-inout);
}

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

img,
svg,
video,
canvas {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

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

::selection {
  background: rgba(46, 124, 246, .35);
  color: #fff;
}

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

/* 键盘可达性：跳转主内容 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 999;
  padding: 10px 16px;
  border-radius: var(--r-sm);
  background: var(--surface-2);
  border: 1px solid var(--line-2);
  color: #fff;
  font-size: var(--fs-sm);
  transform: translateY(-160%);
  transition: transform var(--dur-fast) var(--ease-out);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  color: #fff;
}

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

/* ===== 3. 导航 ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  height: var(--nav-h);
  background: rgba(5, 7, 12, .72);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: background var(--dur-base) var(--ease-inout),
    box-shadow var(--dur-base) var(--ease-inout),
    border-color var(--dur-base) var(--ease-inout);
}

.nav.is-scrolled {
  background: rgba(5, 7, 12, .92);
  border-bottom-color: var(--line-2);
  box-shadow: 0 8px 24px -16px rgba(0, 0, 0, .9);
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  height: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--text);
}

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

.nav__logo img {
  width: 48px;
  height: 24px;
  flex-shrink: 0;
  border-radius: 4px;
}

.nav__brand {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: .01em;
  white-space: normal;
}

.nav__list {
  display: none;
  align-items: center;
  gap: clamp(14px, 1.6vw, 24px);
  margin-left: auto;
}

.nav__link {
  position: relative;
  display: inline-block;
  padding: 6px 0;
  font-size: .9375rem;
  white-space: nowrap;
  color: var(--text-2);
  transition: color var(--dur-fast) var(--ease-inout);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-base) var(--ease-out);
}

.nav__link:hover,
.nav__link:focus-visible {
  color: #fff;
}

.nav__link:hover::after,
.nav__link--active::after {
  transform: scaleX(1);
}

.nav__link--active {
  color: #fff;
}

.nav__cta {
  display: none;
}

.nav__toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  transition: background var(--dur-fast) var(--ease-inout);
}

.nav__toggle:hover {
  background: rgba(255, 255, 255, .04);
}

.nav__toggle span,
.nav__toggle .nav__toggle-bar {
  display: block;
  width: 20px;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur-base) var(--ease-out),
    opacity var(--dur-fast) var(--ease-inout);
}

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

.nav__toggle.is-open span:nth-child(2) {
  opacity: 0;
}

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

/* 移动端抽屉 */
.drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-drawer);
  display: flex;
  justify-content: flex-end;
  background: rgba(5, 7, 12, .72);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-base) var(--ease-inout),
    visibility var(--dur-base) var(--ease-inout);
}

.drawer.is-open {
  opacity: 1;
  visibility: visible;
}

.drawer__panel {
  display: flex;
  flex-direction: column;
  width: min(86vw, 360px);
  height: 100%;
  padding: calc(var(--nav-h) + 24px) var(--gutter) var(--sp-6);
  background: var(--surface);
  border-left: 1px solid var(--line);
  transform: translateX(100%);
  transition: transform var(--dur-base) var(--ease-out);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.drawer.is-open .drawer__panel {
  transform: translateX(0);
}

.drawer__list {
  display: grid;
  gap: 4px;
}

.drawer__link {
  display: flex;
  align-items: center;
  min-height: 56px;
  padding: 0 4px;
  font-size: 1.125rem;
  color: var(--text-2);
  border-bottom: 1px solid var(--line);
}

.drawer__link:hover,
.drawer__link--active {
  color: #fff;
}

.drawer__cta {
  margin-top: var(--sp-5);
}

body.is-locked {
  overflow: hidden;
  touch-action: none;
}

/* ===== 4. 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: .95rem;
  font-weight: 500;
  line-height: 1.2;
  white-space: normal;
  text-align: center;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-inout),
    border-color var(--dur-fast) var(--ease-inout),
    color var(--dur-fast) var(--ease-inout),
    transform var(--dur-fast) var(--ease-inout),
    filter var(--dur-fast) var(--ease-inout);
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background: linear-gradient(120deg, #2E7CF6, #22D3EE);
  color: #fff;
  border-color: transparent;
}

.btn--primary:hover {
  color: #fff;
  filter: brightness(1.08);
}

.btn--ghost {
  background: transparent;
  color: #fff;
  border-color: var(--line-2);
}

.btn--ghost:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, .3);
  background: rgba(255, 255, 255, .04);
}

.btn--sm {
  min-height: 36px;
  padding: 0 16px;
  font-size: .85rem;
}

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

.btn__icon {
  display: inline-block;
  transition: transform var(--dur-fast) var(--ease-out);
}

.btn:hover .btn__icon {
  transform: translateX(3px);
}

.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: .55;
  cursor: not-allowed;
}

.btn[disabled]:active,
.btn[aria-disabled="true"]:active {
  transform: none;
}

/* ===== 5. 区块与标题 ===== */
.sec {
  position: relative;
  padding-block: 52px;
}

.sec--tight {
  padding-block: 40px;
}

.sec--alt {
  background-image: linear-gradient(180deg, #05070C, #070B12);
}

.sec__divider {
  height: 1px;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  background: var(--grad);
  opacity: .16;
}

.sec__head {
  max-width: 62ch;
  margin-bottom: 36px;
}

.sec__head--center {
  margin-inline: auto;
  text-align: center;
}

.sec__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.sec__eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
  opacity: .7;
}

.sec__head--center .sec__eyebrow::after {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
  opacity: .7;
}

.sec__title {
  font-size: var(--fs-h2);
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -.01em;
  color: #fff;
}

.sec__desc {
  margin-top: 16px;
  font-size: var(--fs-lead);
  color: var(--text-2);
  line-height: 1.75;
}

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

/* ===== 6. 网格 ===== */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.grid--gap-lg {
  gap: 32px;
}

.business-grid > .card {
  display: flex;
  flex-direction: column;
}

.business-grid .card__link {
  margin-top: auto;
  padding-top: 20px;
}

@media (min-width: 1200px) {
  .grid.business-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ===== 7. 卡片 ===== */
.card {
  position: relative;
  overflow: hidden;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  transition: background var(--dur-base) var(--ease-inout),
    border-color var(--dur-base) var(--ease-inout),
    transform var(--dur-base) var(--ease-out);
}

.card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .14), transparent);
  pointer-events: none;
}

.card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  color: var(--text-3);
}

.card__title {
  margin-top: 12px;
  font-size: var(--fs-h3);
  font-weight: 600;
  line-height: 1.35;
  color: #fff;
}

.card__desc {
  margin-top: 12px;
  color: var(--text-2);
  line-height: 1.75;
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.card__meta span {
  padding: 4px 10px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-3);
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  font-size: .9rem;
  color: var(--cyan);
}

.card__link:hover {
  color: var(--cyan);
  filter: brightness(1.12);
}

/* 悬停光影：仅在支持 hover 的精细指针设备启用（微信点击粘滞问题） */
@media (hover: hover) and (pointer: fine) {
  .card--hover:hover {
    background: var(--surface-2);
    border-color: var(--line-2);
    transform: translateY(-2px);
  }
}

.card--hover::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 0%),
      rgba(46, 124, 246, .10), transparent 60%);
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-inout);
  pointer-events: none;
}

.card--hover:hover::before {
  opacity: 1;
}

/* ===== 8. 徽标 ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  line-height: 1.4;
  border: 1px solid var(--line-2);
  color: var(--text-3);
}

.badge--soon {
  border-color: rgba(34, 211, 238, .35);
  color: var(--cyan);
  background: rgba(34, 211, 238, .08);
}

.badge--live {
  color: #d7fbe8;
  border-color: rgba(34, 197, 94, .32);
  background: rgba(34, 197, 94, .10);
}

.badge--live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, .14);
}

.badge--muted {
  color: var(--text-3);
}

/* ===== 9. HERO ===== */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: min(720px, calc(90svh - var(--nav-h)));
  overflow: hidden;
  padding-top: 48px;
  padding-bottom: 80px;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: var(--z-backdrop);
  pointer-events: none;
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(46, 124, 246, .16), transparent 60%),
    radial-gradient(900px 500px at 90% 10%, rgba(34, 211, 238, .10), transparent 60%);
  -webkit-mask-image: linear-gradient(180deg, #000 55%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 55%, transparent 100%);
}

.fx-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: .55;
  pointer-events: none;
  will-change: opacity;
  z-index: var(--z-backdrop);
}

.hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-7);
  align-items: center;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.hero__eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
  opacity: .7;
}

.hero__title {
  font-size: clamp(1.75rem, 4.1vw, 3.35rem);
  line-height: 1.18;
  font-weight: 600;
  letter-spacing: -.02em;
  color: #fff;
}

.hero__title em {
  font-style: normal;
  display: inline;
}

.hero__title em.text-grad,
.hero__title .text-grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.hero__desc {
  max-width: 46ch;
  margin-top: 24px;
  font-size: var(--fs-lead);
  color: var(--text-2);
  line-height: 1.75;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 40px;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-3);
  letter-spacing: .04em;
}

.hero__meta li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero__meta li:not(:last-child)::after {
  content: "·";
  opacity: .6;
}

/* 品牌主视觉：轻浮动仅在桌面首屏可见时运行。 */
.hero__copy,
.hero-visual,
.page-head__copy {
  min-width: 0;
}

.hero-visual__frame {
  aspect-ratio: 3 / 2;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 44%, transparent 74%);
  mask-image: radial-gradient(ellipse at center, #000 44%, transparent 74%);
}

.hero-visual__image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  animation: coreFloat 9s ease-in-out infinite;
  animation-play-state: paused;
}

.hero.is-animating .hero-visual__image {
  animation-play-state: running;
}

.hero-visual__label {
  margin: 0 0 20px;
  font: var(--fs-xs) var(--font-mono);
  letter-spacing: .18em;
  color: var(--text-3);
  text-align: center;
}

.hero__scroll {
  position: absolute;
  bottom: 24px;
  left: 50%;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  color: var(--text-3);
  font-size: var(--fs-xs);
  letter-spacing: .08em;
  transform: translateX(-50%);
}

.hero__scroll span {
  position: relative;
  width: 15px;
  height: 23px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-pill);
}

.hero__scroll span::after {
  content: "";
  position: absolute;
  top: 5px;
  left: 6px;
  width: 1px;
  height: 5px;
  background: var(--cyan);
  transition: transform var(--dur-base) var(--ease-out);
}

.hero__scroll:hover span::after {
  transform: translateY(5px);
}

@keyframes coreFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-7px); }
}

.card__visual {
  aspect-ratio: 16 / 9;
  margin-bottom: 20px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--bg);
}

.card__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 800ms var(--ease-out);
}

.card__link span {
  display: inline-block;
  transition: transform var(--dur-base) var(--ease-out);
}

.card__link:hover span,
.card__link:focus-visible span {
  transform: translateX(4px);
}

.card--hover:focus-within {
  border-color: var(--line-2);
}

@media (hover: hover) and (pointer: fine) {
  .card--hover:hover .card__visual img {
    transform: scale(1.045);
  }
}

/* ===== 10. 数据链路（.chain） ===== */
.chain {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
}

.chain__node {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: rgba(11, 16, 24, .7);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text-2);
}

.chain__node--lit {
  border-color: rgba(46, 124, 246, .5);
  color: #fff;
  box-shadow: inset 0 0 0 1px rgba(46, 124, 246, .08);
}

.chain__gap {
  position: relative;
  width: 1px;
  height: 28px;
  margin-left: 22px;
  background: var(--line-2);
}

.chain__gap::after {
  content: "";
  position: absolute;
  top: 0;
  left: -1.5px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--cyan);
  animation: chainFlow 3s linear infinite alternate;
}

@keyframes chainFlow {
  0% {
    transform: translateY(0);
    opacity: .2;
  }

  50% {
    opacity: 1;
  }

  100% {
    transform: translateY(24px);
    opacity: .2;
  }
}

.chain--horizontal {
  flex-direction: row;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.chain--horizontal .chain__node {
  justify-content: center;
  padding: 8px;
  font-size: .625rem;
  letter-spacing: .06em;
  border-radius: 6px;
}

.chain--horizontal .chain__gap {
  flex: 1;
  min-width: 6px;
  max-width: 28px;
  height: 1px;
  margin: 0;
  overflow: hidden;
}

.chain--horizontal .chain__gap::after {
  left: 0;
  width: 32%;
  height: 1px;
  border-radius: 0;
  animation: chainFlowHorizontal 3.6s ease-in-out infinite;
  animation-play-state: paused;
}

.hero.is-animating .chain__gap::after {
  animation-play-state: running;
}

.chain--horizontal .chain__gap:nth-child(4)::after { animation-delay: .6s; }
.chain--horizontal .chain__gap:nth-child(6)::after { animation-delay: 1.2s; }
.chain--horizontal .chain__gap:nth-child(8)::after { animation-delay: 1.8s; }

@keyframes chainFlowHorizontal {
  0% { transform: translateX(-100%); opacity: 0; }
  35%, 65% { opacity: .8; }
  100% { transform: translateX(320%); opacity: 0; }
}

/* ===== 11. 流程步骤 ===== */
.flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.flow__step {
  position: relative;
  padding: 0 0 28px 32px;
  border-left: 1px solid var(--line);
}

.flow__step:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.flow__step::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid rgba(46, 124, 246, .7);
}

.flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .12em;
  color: var(--cyan);
}

.flow__title {
  margin-top: 6px;
  font-size: var(--fs-h3);
  font-weight: 600;
  line-height: 1.35;
  color: #fff;
}

.flow__desc {
  margin-top: 8px;
  font-size: var(--fs-sm);
  color: var(--text-2);
  line-height: 1.75;
}

/* ===== 12. 能力条（strip） ===== */
.strip {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--text-3);
}

.strip li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.strip li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand);
  flex-shrink: 0;
}

/* ===== 13. 表格 ===== */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.table th,
.table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.table th {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: .1em;
  font-weight: 500;
  color: var(--text-3);
  white-space: normal;
}

.table td {
  color: var(--text-2);
}

.table tbody tr:hover {
  background: rgba(255, 255, 255, .02);
}

/* ===== 14. 表单 ===== */
.form {
  display: grid;
  gap: 20px;
}

.form__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.field {
  display: grid;
  gap: 8px;
}

.field__label {
  font-size: .85rem;
  color: var(--text-2);
}

.field__label .req {
  color: var(--cyan);
  margin-left: 2px;
}

.field__input,
.field textarea,
.field select {
  color-scheme: dark;
  cursor: pointer;
  background-color: var(--surface);
  width: 100%;
  min-height: 48px;
  height: 48px;
  padding: 0 16px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line-2);
  background: rgba(255, 255, 255, .03);
  color: #fff;
  font-size: 1rem;
  line-height: 1.4;
  transition: border-color var(--dur-fast) var(--ease-inout),
    box-shadow var(--dur-fast) var(--ease-inout),
    background var(--dur-fast) var(--ease-inout);
  appearance: none;
  -webkit-appearance: none;
}

.field textarea {
  height: auto;
  min-height: 140px;
  padding: 14px 16px;
  resize: vertical;
  line-height: 1.7;
}

.field select {
  background-image: linear-gradient(45deg, transparent 50%, var(--text-2) 50%),
    linear-gradient(135deg, var(--text-2) 50%, transparent 50%);
  background-position: calc(100% - 20px) 21px, calc(100% - 14px) 21px;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 40px;
}

.field select:has(option:checked[value=""]) {
  color: var(--text-2);
}

.field select option {
  background: var(--surface);
  color: var(--text);
}

.field__input::placeholder,
.field textarea::placeholder {
  color: var(--text-3);
}

.field__input:hover,
.field textarea:hover,
.field select:hover {
  border-color: rgba(255, 255, 255, .22);
}

.field__input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(46, 124, 246, .18);
}

/* 原生可定制下拉：保留表单、键盘与触屏行为；旧浏览器使用深色原生选单。 */
@supports (appearance: base-select) and selector(::picker(select)) {
  .field select,
  .field select::picker(select) {
    appearance: base-select;
  }

  .field select {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-right: 18px;
    background-image: none;
  }

  .field select:open,
  .field select:focus-visible {
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(46, 124, 246, .18);
  }

  .field select::picker-icon {
    content: "";
    width: 8px;
    height: 8px;
    margin-inline-start: auto;
    flex-shrink: 0;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    color: var(--text-2);
    rotate: 45deg;
    transition: rotate var(--dur-base) var(--ease-out), color var(--dur-fast);
  }

  .field select:open::picker-icon {
    color: var(--cyan);
    rotate: 225deg;
  }

  .field select::picker(select) {
    min-inline-size: anchor-size(width);
    max-inline-size: calc(100vw - 32px);
    max-block-size: min(320px, 70dvh);
    margin-block: 6px;
    padding: 6px;
    overflow-y: auto;
    border: 1px solid var(--line-2);
    border-radius: var(--r-sm);
    background: var(--surface);
    color: var(--text);
    box-shadow: var(--shadow);
    scrollbar-width: thin;
    scrollbar-color: var(--line-2) transparent;
    opacity: 0;
    transform: translateY(-4px);
    transition: opacity var(--dur-fast) var(--ease-out),
      transform var(--dur-fast) var(--ease-out),
      display var(--dur-fast) allow-discrete, overlay var(--dur-fast) allow-discrete;
  }

  .field select::picker(select):popover-open {
    opacity: 1;
    transform: none;
  }

  @starting-style {
    .field select::picker(select):popover-open {
      opacity: 0;
      transform: translateY(-4px);
    }
  }

  .field select option {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 44px;
    padding: 10px 12px;
    border-radius: 8px;
    font-size: var(--fs-body);
    line-height: 1.5;
    white-space: normal;
    overflow-wrap: anywhere;
    cursor: pointer;
    transition: background var(--dur-fast), color var(--dur-fast);
  }

  .field select option:hover,
  .field select option:focus {
    background: var(--surface-2);
  }

  .field select option:checked {
    background: var(--brand-soft);
    color: var(--cyan);
    font-weight: 500;
  }

  .field select option:focus-visible {
    outline: 1px solid var(--brand);
    outline-offset: -2px;
  }

  .field select option::checkmark {
    order: 1;
    margin-inline-start: auto;
    color: var(--cyan);
  }
}

.field__error {
  display: none;
  font-size: .78rem;
  color: var(--error);
  line-height: 1.5;
}

.field.is-error .field__error {
  display: block;
}

.field.is-error .field__input,
.field.is-error textarea,
.field.is-error select {
  border-color: var(--error);
}

.field__hint {
  font-size: .78rem;
  color: var(--text-3);
}

.form__privacy {
  font-size: .78rem;
  color: var(--text-3);
  line-height: 1.7;
}

.form__ok {
  display: grid;
  justify-items: center;
  gap: 12px;
  padding: 48px 32px;
  border: 1px solid rgba(34, 211, 238, .3);
  border-radius: var(--r-lg);
  background: rgba(34, 211, 238, .06);
  text-align: center;
}

.form[hidden],
.form__ok[hidden] {
  display: none;
}

.form__ok-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(34, 211, 238, .45);
  color: var(--cyan);
  font-size: 1.25rem;
}

.form__ok h3 {
  font-size: var(--fs-h3);
  font-weight: 600;
  color: #fff;
}

.form__ok p {
  max-width: 40ch;
  font-size: var(--fs-sm);
  color: var(--text-2);
  line-height: 1.75;
}

.form__error {
  font-size: .85rem;
  color: var(--error);
}

/* ===== 15. CTA 区块 ===== */
.cta {
  position: relative;
  padding-block: 64px;
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--grad);
  opacity: .5;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 30%, #000 70%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 30%, #000 70%, transparent);
}

.cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.cta__title {
  font-size: var(--fs-h2);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: #fff;
}

.cta__desc {
  margin-top: 16px;
  font-size: var(--fs-lead);
  color: var(--text-2);
  line-height: 1.75;
}

.cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.cta__contact {
  display: grid;
  gap: 12px;
  align-content: start;
  font-size: var(--fs-sm);
}

.cta__contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text-2);
  line-height: 1.6;
}

.cta__contact svg {
  width: 16px;
  height: 16px;
  margin-top: 3px;
  flex-shrink: 0;
  color: var(--cyan);
}

.qr {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 192px;
  height: 192px;
  max-width: 100%;
  border: 1px dashed var(--line-2);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, .02);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-3);
  text-align: center;
  padding: 16px;
}

/* ===== 16. 页脚 ===== */
.footer {
  padding-block: 48px 28px;
  background: #05070C;
  border-top: 1px solid var(--line);
  font-size: var(--fs-sm);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
}

.footer__brand img {
  width: 48px;
  height: 24px;
  border-radius: 4px;
}

.brand-signature {
  margin-bottom: 24px;
  padding: 20px;
  border-radius: var(--r-md);
  background: #fff;
}

.brand-signature img {
  width: min(100%, 320px);
  height: auto;
  margin-inline: auto;
}

.footer__desc {
  margin-top: 16px;
  max-width: 34ch;
  color: var(--text-3);
  line-height: 1.75;
}

.footer__title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--text-3);
  font-weight: 500;
}

.footer__list {
  display: grid;
  gap: 10px;
}

.footer__link {
  color: var(--text-2);
}

.footer__link:hover {
  color: #fff;
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: .75rem;
  color: var(--text-3);
  max-width: var(--container);
  margin-inline: auto;
}

.footer__placeholder {
  color: var(--cyan);
  border-bottom: 1px dotted rgba(34, 211, 238, .5);
}

/* ===== 17. 内页页头 ===== */
.page-head {
  position: relative;
  overflow: hidden;
  padding-top: 72px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--line);
}

/* 页头背景层与首屏保持一致：柔光 + 粒子，渐隐到正文 */
.page-head::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: var(--z-backdrop);
  pointer-events: none;
  background:
    radial-gradient(1100px 520px at 12% -20%, rgba(46, 124, 246, .16), transparent 62%),
    radial-gradient(800px 420px at 92% 0%, rgba(34, 211, 238, .09), transparent 62%);
  -webkit-mask-image: linear-gradient(180deg, #000 50%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 50%, transparent 100%);
}

.page-head > .fx-canvas {
  -webkit-mask-image: linear-gradient(180deg, #000 55%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 55%, transparent 100%);
}

.page-head__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-head__title {
  font-size: var(--fs-h1);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: #fff;
}

.page-head__desc {
  max-width: 60ch;
  margin-top: 20px;
  font-size: var(--fs-lead);
  color: var(--text-2);
  line-height: 1.75;
}

.page-head--illustrated {
  padding-block: 56px;
}

.page-head--illustrated .page-head__inner {
  display: grid;
  align-items: center;
  gap: 32px;
}

.page-head__visual img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 40%, transparent 75%);
  mask-image: radial-gradient(ellipse at center, #000 40%, transparent 75%);
}

.page-head__visual figcaption {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 16px;
  color: var(--text-3);
  font: var(--fs-xs) var(--font-mono);
  letter-spacing: .08em;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-3);
}

.breadcrumb a {
  color: var(--text-3);
}

.breadcrumb a:hover {
  color: var(--cyan);
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  opacity: .5;
}

/* ===== 大湾区服务 ===== */
.bay-home__inner,
.bay-hero .page-head__inner {
  display: grid;
  align-items: center;
  gap: 40px;
}

.bay-home__link {
  margin-top: 28px;
}

.bay-home__list li {
  display: flex;
  gap: 20px;
  padding-block: 22px;
  border-bottom: 1px solid var(--line);
}

.bay-home__list li:first-child { padding-top: 0; }
.bay-home__list li:last-child { padding-bottom: 0; border-bottom: 0; }

.bay-home__num {
  padding-top: 4px;
  font: var(--fs-xs) var(--font-mono);
  color: var(--cyan);
}

.bay-home__list h3 {
  font-size: var(--fs-h3);
  font-weight: 500;
  line-height: 1.5;
}

.bay-home__list p {
  margin-top: 8px;
  color: var(--text-2);
}

.bay-hero {
  padding-block: 56px;
}

.bay-hero .page-head__title {
  font-size: clamp(2.25rem, 4.4vw, 3.6rem);
  line-height: 1.18;
}

.bay-hero .hero__actions {
  margin-top: 28px;
}

.bay-hero__caption {
  margin-top: 24px;
  color: var(--text-2);
  font-size: var(--fs-sm);
  letter-spacing: .06em;
}

.bay-network {
  position: relative;
  width: 100%;
  max-width: 520px;
  height: 360px;
  margin: 0 auto 24px;
}

.bay-network__lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.bay-network__core {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 7px;
  width: 144px;
  height: 144px;
  transform: translate(-50%, -50%);
  border: 1px solid rgba(46, 124, 246, .45);
  border-radius: 50%;
  background: var(--surface);
  box-shadow: 0 0 0 12px var(--brand-soft);
}

.bay-network__core img { border-radius: 3px; }
.bay-network__core strong { font-size: 1.75rem; line-height: 1.3; font-weight: 500; }
.bay-network__core > span { color: var(--cyan); font: var(--fs-xs) var(--font-mono); letter-spacing: .08em; }

.bay-network__node {
  position: absolute;
  display: grid;
  gap: 5px;
  padding: 12px 14px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  background: var(--surface);
}

.bay-network__node strong { font-size: var(--fs-sm); font-weight: 500; }
.bay-network__node span { color: var(--text-2); font-size: var(--fs-xs); white-space: nowrap; }
.bay-network__node--industry { top: 12%; left: 2%; }
.bay-network__node--export { top: 12%; right: 2%; }
.bay-network__node--agent { bottom: 12%; left: 2%; }
.bay-network__node--compute { bottom: 12%; right: 2%; }

.bay-network figcaption {
  position: absolute;
  top: calc(100% + 12px);
  width: 100%;
  text-align: center;
  color: var(--text-2);
  font-size: var(--fs-xs);
  letter-spacing: .06em;
}

.bay-scenarios > .card {
  display: flex;
  flex-direction: column;
}

.bay-scenarios__list {
  margin-block: 20px 24px;
}

.bay-deliverable {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--text-2);
  font-size: var(--fs-sm);
}

.bay-deliverable > span {
  display: block;
  margin-bottom: 4px;
  color: var(--cyan);
  font-size: var(--fs-xs);
}

.bay-sources {
  margin-top: 24px;
  color: var(--text-3);
  font-size: var(--fs-xs);
}

.bay-sources a {
  color: var(--text-2);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.bay-review { margin-top: 32px; }

.bay-cta__scope {
  align-self: center;
  padding-left: 24px;
  border-left: 1px solid var(--line-2);
}

.bay-cta__scope .strip { margin-top: 20px; color: var(--text-2); }

@media (min-width: 900px) {
  .bay-home__inner,
  .bay-hero .page-head__inner {
    grid-template-columns: 1.1fr 1fr;
    gap: 64px;
  }
}

@media (max-width: 639px) {
  .bay-network { height: 320px; }
  .bay-network__core { width: 120px; height: 120px; box-shadow: 0 0 0 8px var(--brand-soft); }
  .bay-network__node { padding: 10px 12px; }
  .bay-network__node--industry,
  .bay-network__node--export { top: 4%; }
  .bay-network__node--agent,
  .bay-network__node--compute { bottom: 4%; }
}

/* ===== 18. 通用小工具块 ===== */
.muted {
  color: var(--text-3);
}

/* 结构化框图：模型 + 系统 + 数据库 + API → AI 自动化系统 */
.diagram {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  padding: var(--sp-5);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}

.diagram__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2);
}

.diagram__box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .08em;
  color: var(--text-2);
  background: rgba(255, 255, 255, .035);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  text-align: center;
}

.diagram__box--accent {
  color: #fff;
  border-color: rgba(46, 124, 246, .4);
  background: rgba(46, 124, 246, .12);
}

.diagram__op {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-3);
  padding-inline: 4px;
}

.diagram__arrow {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--cyan);
  padding-inline: 2px;
}

.diagram__caption {
  margin-top: var(--sp-2);
  font-size: var(--fs-xs);
  color: var(--text-3);
  line-height: 1.7;
}

/* 横向步骤链：行业方案中的能力/流程串联 */
.pipeline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2);
  margin-top: var(--sp-4);
}

.pipeline__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-size: var(--fs-sm);
  color: var(--text-2);
  background: rgba(255, 255, 255, .035);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
}

.pipeline__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.pipeline__sep {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-3);
}

/* 联系页两栏：表单 + 信息侧栏 */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-8);
  align-items: start;
}

@media (min-width: 900px) {
  .contact-layout {
    grid-template-columns: 1.25fr .75fr;
    gap: var(--sp-9);
  }
}

.note {
  padding-left: 16px;
  border-left: 2px solid var(--brand);
  font-size: .9rem;
  color: var(--text-2);
  line-height: 1.75;
}

.list-check {
  display: grid;
  gap: 10px;
}

.list-check li {
  position: relative;
  padding-left: 22px;
  color: var(--text-2);
  line-height: 1.75;
}

.list-check li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: .66em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.step-list {
  display: grid;
  gap: 12px;
  counter-reset: sl;
}

.step-list li {
  position: relative;
  padding-left: 34px;
  color: var(--text-2);
  line-height: 1.75;
  counter-increment: sl;
}

.step-list li::before {
  content: counter(sl, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--cyan);
  letter-spacing: .08em;
}

.kv {
  display: grid;
  gap: 0;
}

.kv > div {
  display: grid;
  grid-template-columns: minmax(96px, 160px) 1fr;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.kv dt {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--text-3);
  padding-top: 2px;
}

.kv dd {
  margin: 0;
  color: var(--text-2);
}

/* ===== 19. 滚动淡入动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
  /* 动画结束后释放合成层，避免长页面常驻显存 */
  will-change: auto;
}

.reveal--d1 {
  transition-delay: 80ms;
}

.reveal--d2 {
  transition-delay: 160ms;
}

.reveal--d3 {
  transition-delay: 240ms;
}

/* 无 JS 兜底：内容始终可见 */
html:not(.js) .reveal {
  opacity: 1;
  transform: none;
}

/* ===== 20. 媒体查询：≥640px ===== */
@media (min-width: 640px) {
  .sec {
    padding-block: 72px;
  }

  .sec--tight {
    padding-block: 56px;
  }

  .card {
    padding: 28px;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

/* ===== 21. 媒体查询：≥640px 的表格堆叠变体 ===== */
@media (max-width: 639px) {
  .table--stack {
    display: block;
  }

  .table--stack thead {
    display: none;
  }

  .table--stack tbody,
  .table--stack tr,
  .table--stack td {
    display: block;
    width: 100%;
  }

  .table--stack tr {
    padding: 8px 0;
    border-bottom: 1px solid var(--line);
  }

  .table--stack td {
    padding: 6px 0;
    border-bottom: 0;
  }

  .table--stack td::before {
    content: attr(data-label);
    display: block;
    margin-bottom: 2px;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--text-3);
  }
}

/* ===== 22. 媒体查询：≥900px ===== */
@media (min-width: 900px) {
  :root {
    --nav-h: 76px;
  }

  .nav__list {
    display: flex;
  }

  .hero__inner {
    grid-template-columns: 1.15fr 1fr;
    gap: 32px;
  }

  .hero__copy .hero__actions {
    margin-top: 32px;
  }

  .hero__copy .hero__meta {
    margin-top: 32px;
  }

  .page-head--illustrated .page-head__inner {
    grid-template-columns: 1.1fr 1fr;
    gap: 48px;
  }

  .nav__cta {
    display: inline-flex;
    margin-left: 8px;
  }

  .nav__toggle {
    display: none;
  }

  .drawer {
    display: none;
  }

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

  .grid--4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px 24px;
  }

  .flow__step {
    padding: 28px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .flow__step:last-child {
    border-top-color: var(--line);
  }

  .flow__step::before {
    left: 0;
    top: -4.5px;
  }

  .cta {
    padding-block: 72px;
  }

  .cta__inner {
    grid-template-columns: 1.2fr .8fr;
    gap: 48px;
    align-items: start;
  }

  .footer__grid {
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 40px;
  }
}

/* ===== 23. 媒体查询：≥1200px ===== */
@media (min-width: 1200px) {
  .hero__inner {
    grid-template-columns: 1.15fr 1fr;
    gap: 32px;
  }

  .flow--six {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (max-width: 899px) {
  .nav__inner {
    gap: 8px;
  }

  .nav__cta {
    display: inline-flex;
    flex-shrink: 0;
    min-height: 44px;
    padding-inline: 12px;
    font-size: var(--fs-xs);
    white-space: nowrap;
  }

  .nav__toggle {
    flex-shrink: 0;
  }

  .hero {
    min-height: auto;
    padding-top: 40px;
    padding-bottom: 64px;
  }

  .hero__title {
    font-size: clamp(1.75rem, 7.8vw, 3rem);
  }

  .hero__inner {
    gap: 24px;
  }

  .hero-visual {
    width: min(100%, 480px);
    margin-inline: auto;
  }

  .hero__scroll {
    bottom: 12px;
  }

  .fx-canvas {
    display: none;
  }
}

@media (max-width: 639px) {
  .hero__copy .hero__actions {
    gap: 10px;
    margin-top: 28px;
  }

  .hero__copy .hero__actions .btn {
    padding-inline: 14px;
    font-size: var(--fs-sm);
  }

  .hero__copy .hero__meta {
    gap: 8px;
    margin-top: 24px;
    padding-top: 16px;
  }
}

/* ===== 24. 减少动态效果兜底 ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }

  .fx-canvas {
    display: none !important;
  }

  .chain__gap::after {
    display: none;
  }

  .hero-visual__image {
    animation: none;
  }

  .card--hover:hover,
  .card--hover:hover .card__visual img,
  .card__link span,
  .btn__icon,
  .hero__scroll span::after {
    transform: none !important;
  }
}