:root {
    /* ===== AngelList 设计令牌（从原站 CSS 提取）===== */
    --white-0: #fff;
    --white-1: #f9f9f7;
    --white-2: #f3f4f2;
    --white-3: #ebeceb;
    --white-4: #848888;
    --white-5: #68706f;

    --ink-0: #000;
    --ink-1: #06264f;
    --ink-2: #0b3270;
    --ink-3: #11407f;
    --ink-4: #a9bce4;
    --ink-5: #c7d5f0;

    --purple-0: #fc5185;
    --purple-1: #ff6b99;
    --purple-2: #fc5185;
    --purple-3: #ffd9e4;

    --mauve-0: #c03a6d;
    --mauve-1: #ff8fb3;
    --mauve-2: #ffc9d9;

    --coral-1: #fb8569;
    --coral-2: #fed6cf;

    --gold-0: #8fa6d8;
    --gold-1: #b7c6ea;

    --grad-accent: linear-gradient(186deg, #fc5185 -10%, #0e4397 50%, #fc5185 110%);

    /* 深色主题语义色 */
    --surface-bg: var(--ink-1);
    --surface-muted: var(--ink-2);
    --surface-text: var(--white-1);
    --surface-muted-text: var(--ink-4);
    --surface-accent: var(--purple-2);
    --surface-stroke: #ffffff33;
    --card-bg: var(--ink-2);
    --card-hover: var(--ink-3);
    --hero-title: #eaf0ff;

    /* 圆角（冷静风格，整体收窄） */
    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 4px;
    --radius-xl: 6px;
    --radius-2xl: 8px;
    --radius-3xl: 10px;
    --radius-4xl: 12px;

    /* 时长 */
    --dur-short: 70ms;
    --dur-medium: 150ms;
    --dur-long: 400ms;
    --dur-xlong: 800ms;

    /* 缓动 */
    --ease-out: cubic-bezier(.16, 1, .3, 1);

    /* 字体 */
    --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    --font-mono: "DM Mono", ui-monospace, Menlo, Monaco, "Cascadia Mono", "Segoe UI Mono", monospace;

    /* 字号系统（原站 clamp 值） */
    --fs-display-100: clamp(4rem, 2.765rem + 4.71vw, 7rem);
    --fs-headline-200: clamp(1.375rem, 1.221rem + .59vw, 1.75rem);
    --fs-headline-300: clamp(1.563rem, 1.228rem + 1.27vw, 2.375rem);
    --fs-headline-400: clamp(2rem, 1.588rem + 1.57vw, 3rem);
    --fs-headline-500: clamp(2.375rem, 1.809rem + 2.16vw, 3.75rem);
    --fs-body-500: 1.125rem;

    --max-w: 1536px;
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; scroll-padding-top: 88px; }

  body {
    font-family: var(--font-sans);
    background: var(--surface-bg);
    color: var(--surface-text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: -0.002em;
    overflow-x: hidden;
  }

  a { color: inherit; text-decoration: none; }
  img { display: block; max-width: 100%; }
  ul { list-style: none; }

  .container {
    width: 100%;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 40px;
  }

  /* 滚动进入动画（模拟 GSAP fadeInUp） */
  [data-reveal] {
    opacity: 0;
    transform: translateY(40px);
    transition:
      opacity var(--dur-xlong) var(--ease-out),
      transform var(--dur-xlong) var(--ease-out);
  }
  [data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 48px;
    padding: 0 24px;
    border: 1px solid transparent;
    border-radius: 999px;   /* 全圆角药丸，与 wb-btn 一致 */
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--dur-long) var(--ease-out), color var(--dur-long) var(--ease-out), border-color var(--dur-long) var(--ease-out);
  }
  .btn-primary {
    background: var(--white-0);
    color: var(--ink-1);
  }
  .btn-primary:hover {
    background: var(--purple-2);
    color: var(--ink-1);
  }
  /* 次级按钮：虚线描边（与 wb-btn--ghost 一致），不再与主按钮同底 */
  .btn-ghost {
    background: transparent;
    border: 1px dashed var(--surface-stroke);
    color: var(--surface-text);
  }
  .btn-ghost:hover {
    background: var(--purple-2);
    border-color: var(--purple-2);
    color: var(--ink-1);
  }
  /* 统一按钮聚焦态 */
  .btn:focus-visible,
  .btn-ghost:focus-visible,
  .menu-btn:focus-visible,
  .nav-item > .nav-link:focus-visible,
  .mobile-menu-trigger:focus-visible,
  .ai-float:focus-visible,
  .md-reader__btn--side-expand:focus-visible {
    outline: 2px solid var(--purple-2);
    outline-offset: 2px;
  }

  /* ============ 全局：文字可选中复制，但不显示闪烁插入符 ============ */
  /* caret-color 可继承，挂在 body 上即全站生效；仅输入框豁免（下面一条恢复） */
  body { caret-color: transparent; }
  input, textarea, [contenteditable] { caret-color: auto; }

  /* ============ Header ============ */
  .header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: 64px;
    background: rgba(6, 38, 79, 0.5);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--surface-stroke);
  }
  .header-inner {
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
  }
  .logo {
    font-weight: 800;
    font-size: 20px;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 9px;
  }
  .logo-img { height: 34px; width: auto; display: block; }
  .footer-logo { height: 64px; }
  .nav {
    display: flex;
    align-items: center;
    gap: 4px;
    background: rgba(255,255,255,0.06);
    border-radius: 4px;
    padding: 4px;
  }
  .nav a {
    padding: 9px 15px;
    border-radius: 999px;
    font-size: 15px;
    color: var(--surface-text);
    transition: background var(--dur-long) var(--ease-out), color var(--dur-long) var(--ease-out), border-radius var(--dur-long) var(--ease-out);
    white-space: nowrap;
  }
  .nav a:hover { background: var(--purple-2); color: var(--ink-1); border-radius: 999px; }
  .nav a[data-tip] { position: relative; }
  .nav a[data-tip]::after {
    content: attr(data-tip);
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
    background: var(--surface-text);
    color: var(--ink-1);
    font-size: 12px;
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-medium) ease, transform var(--dur-medium) ease;
    z-index: 20;
  }
  .nav a[data-tip]::before {
    content: "";
    position: absolute;
    top: calc(100% + 4px);
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
    width: 8px; height: 8px;
    background: var(--surface-text);
    opacity: 0;
    transition: opacity var(--dur-medium) ease;
    z-index: 20;
  }
  .nav a[data-tip]:hover::after, .nav a[data-tip]:hover::before { opacity: 1; }
  .nav a[data-tip]:hover::after { transform: translateX(-50%) translateY(0); }

  /* 顶栏语言切换（中 ↔ EN） */
  .lang-switch.is-hidden { display: none; }
  .nav .lang-switch {
    margin-left: 2px;
    padding: 7px 13px;
    border: 1px solid var(--surface-stroke);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.05em;
    line-height: 1.1;
  }
  .nav .lang-switch:hover {
    border-radius: 999px;
    background: var(--purple-2);
    color: var(--ink-1);
  }

  /* ============ 哇蓝产品 下拉菜单 ============ */
  .nav-item {
    position: relative;
    display: flex;
  }
  .nav-item > .nav-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 9px 15px;
    border: none;
    border-radius: 999px;
    font-size: 15px;
    font-family: inherit;
    color: var(--surface-text);
    background: none;
    cursor: pointer;
    white-space: nowrap;
    transition: background var(--dur-long) var(--ease-out), color var(--dur-long) var(--ease-out), border-radius var(--dur-long) var(--ease-out);
  }
  .nav-item > .nav-link .caret {
    font-size: 10px;
    line-height: 1;
    opacity: 0.7;
    transition: transform var(--dur-medium) ease;
  }
  .nav-item:hover > .nav-link,
  .nav-item.is-open > .nav-link {
    background: var(--purple-2);
    color: var(--ink-1);
    border-radius: 999px;
  }
  .nav-item:hover > .nav-link .caret,
  .nav-item.is-open > .nav-link .caret {
    transform: rotate(180deg);
  }
  .nav-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%) translateY(-6px);
    min-width: 208px;
    padding: 8px;
    background: rgba(6, 38, 79, 0.96);
    border: 1px dashed var(--surface-stroke);
    border-radius: var(--radius-lg);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--dur-medium) ease, transform var(--dur-medium) ease, visibility 0s var(--dur-medium);
    z-index: 120;
  }
  .nav-item:hover .nav-dropdown,
  .nav-item.is-open .nav-dropdown,
  .nav-item:focus-within .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
    transition: opacity var(--dur-medium) ease, transform var(--dur-medium) ease;
  }
  .nav-dropdown a {
    display: block;
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--surface-text);
    white-space: nowrap;
    transition: background var(--dur-medium) ease, color var(--dur-medium) ease;
  }
  .nav-dropdown a:hover {
    background: var(--purple-2);
    color: var(--ink-1);
  }
  .menu-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    color: var(--surface-text);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background var(--dur-medium) ease;
  }
  .menu-btn:hover { background: rgba(255,255,255,0.08); }
  .menu-btn svg { width: 20px; height: 20px; }
  .menu-btn .icon-close { display: none; }
  .menu-btn.is-open .icon-menu { display: none; }
  .menu-btn.is-open .icon-close { display: block; }

  .mobile-menu {
    display: flex;
    flex-direction: column;
    padding: 0 20px;
    border-top: 1px solid var(--surface-stroke);
    background: rgba(6, 38, 79, 0.96);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-8px);
    visibility: hidden;
    transition:
      max-height var(--dur-long) var(--ease-out),
      padding var(--dur-long) var(--ease-out),
      opacity var(--dur-long) var(--ease-out),
      transform var(--dur-long) var(--ease-out),
      visibility 0s var(--dur-long);
  }
  .mobile-menu.is-open {
    max-height: 720px;
    padding: 8px 20px 20px;
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
    transition:
      max-height var(--dur-long) var(--ease-out),
      padding var(--dur-long) var(--ease-out),
      opacity var(--dur-long) var(--ease-out),
      transform var(--dur-long) var(--ease-out),
      visibility 0s;
  }
  .mobile-menu a {
    padding: 14px 0;
    font-size: 17px;
    color: var(--surface-text);
    border-bottom: 1px solid var(--surface-stroke);
  }
  .mobile-menu a:last-child { border-bottom: none; }
  .mobile-menu .mobile-lang {
    margin: 10px 0 2px;
    padding: 12px 0;
    border: 1px solid var(--surface-stroke);
    border-radius: 999px;
    text-align: center;
    font-size: 15px;
    font-weight: 700;
  }

  /* 移动端菜单内的“哇蓝产品”展开组 */
  .mobile-menu-group {
    border-bottom: 1px solid var(--surface-stroke);
  }
  .mobile-menu-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 14px 0;
    font-size: 17px;
    font-family: inherit;
    color: var(--surface-text);
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
  }
  .mobile-menu-trigger .caret {
    font-size: 12px;
    opacity: 0.7;
    transition: transform var(--dur-medium) ease;
  }
  .mobile-menu-group.is-open .mobile-menu-trigger .caret {
    transform: rotate(180deg);
  }
  .mobile-menu-sub {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--dur-long) var(--ease-out), opacity var(--dur-long) var(--ease-out);
  }
  .mobile-menu-group.is-open .mobile-menu-sub {
    max-height: 260px;
    opacity: 1;
  }
  .mobile-menu-sub a {
    display: block;
    padding: 12px 0 12px 16px;
    font-size: 15px;
    color: var(--surface-muted-text);
    border-bottom: 1px solid var(--surface-stroke);
  }
  .mobile-menu-sub a:last-child { border-bottom: none; }
  .mobile-menu-sub a:hover { color: var(--purple-2); }
  .mobile-menu-sub span {
    display: block;
    padding: 12px 0 12px 16px;
    font-size: 15px;
    color: var(--surface-muted-text);
    border-bottom: 1px solid var(--surface-stroke);
  }

  /* ============ Hero ============ */
  .hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 96px 0 24px;
    background: var(--ink-1);
    overflow: hidden;
  }
  .hero::before {
    content: "";
    position: absolute;
    inset: -6%;
    z-index: 0;
    background:
      radial-gradient(55% 55% at 18% 18%, rgba(14,67,151,0.45) 0%, transparent 62%),
      radial-gradient(50% 50% at 82% 28%, rgba(252,81,133,0.22) 0%, transparent 60%),
      radial-gradient(60% 60% at 50% 100%, rgba(6,20,46,0.9) 0%, transparent 65%);
    transform: translate3d(var(--bgx, 0px), var(--bgy, 0px), 0);
    transition: transform var(--dur-long) var(--ease-out);
    will-change: transform;
    pointer-events: none;
  }
  .hero .container { position: relative; z-index: 1; padding-bottom: 40px; width: 100%; }
  .hero h1 {
    font-size: var(--fs-display-100);
    line-height: 1.2;
    letter-spacing: -0.015em;
    font-weight: 800;
    color: var(--hero-title);
    max-width: 24ch;
  }
  .hero .sub {
    max-width: 24em;
    margin-top: 28px;
    font-size: var(--fs-headline-200);
    line-height: 1.3;
    color: var(--surface-text);
    text-wrap: balance;
  }
  .hero .cta { margin-top: 32px; }

  /* CTA 按钮组：相邻按钮留间距（避免多个按钮粘在一起） */
  .cta .btn + .btn { margin-left: 14px; }

  /* 副标题防孤字：平衡断行，任何宽度下不出现单字成行 */
  .page-hero .sub,
  .section-title .lead { text-wrap: balance; }

  /* 普通段落防孤字：末行避免孤字 */
  p { text-wrap: pretty; }

  /* 极窄屏：撤掉手动 <br>，副标题整体自然流动，避免分段放不下甩出孤字 */
  @media (max-width: 360px) {
    .hero .sub br,
    .page-hero .sub br,
    .section-title .lead br { display: none; }
  }

  /* ============ Products（横向滚动卡片）============ */
  .products {
    padding: 24px 0 96px;
    background: var(--ink-1);
  }
  .products-scroll {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .products-scroll::-webkit-scrollbar { display: none; }
  .product-card {
    flex: 1 0 22%;
    min-width: 260px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 12px 0;
    border-top: 1px solid var(--surface-stroke);
    border-bottom: 1px solid var(--surface-stroke);
    scroll-snap-align: start;
  }
  .product-card h3 { font-size: var(--fs-body-500); font-weight: 500; }
  .product-card .thumb {
    position: relative;
    aspect-ratio: 3 / 4;
    overflow: hidden;
    border-radius: var(--radius-xl);
    background: var(--ink-2);
  }
  .product-card .thumb img {
    width: 100%; height: 100%; object-fit: cover;
    transform: scale(1.05);
    transition: transform var(--dur-xlong) var(--ease-out), filter var(--dur-xlong) var(--ease-out);
  }
  /* 悬停卡片容器时，非当前卡片图片变暗 */
  .products-scroll:hover .product-card .thumb img { filter: brightness(0.6); }
  .product-card:hover .thumb img { transform: scale(1); filter: brightness(1); }

  /* ============ Partners ============ */
  .partners { min-height: 100vh; display: flex; align-items: center; padding: 96px 0; background: var(--ink-1); text-align: center; }
  .partners .container { width: 100%; }
  .partners h2 { font-size: var(--fs-headline-200); line-height: 1.3; max-width: 32ch; margin: 0 auto; }
  .partner-logos {
    display: flex; flex-wrap: wrap; justify-content: center; align-items: center;
    gap: 48px; margin-top: 48px;
  }
  .partner-logos span, .partner-logos a {
    font-weight: 700; font-size: 20px; color: var(--hero-title);
    letter-spacing: -0.01em; opacity: 0.85;
    transition: opacity var(--dur-medium) ease, color var(--dur-medium) ease;
  }
  .partner-logos a:hover { opacity: 1; color: var(--purple-2); }

  /* ============ Feature / Agentic ============ */
  .feature {
    background: var(--ink-2);
    border-radius: 0;
    padding: 80px 64px;
    margin-bottom: 0;
    position: relative;
    overflow: hidden;
  }
  #pricing-2 { background: transparent; }
  .feature .container { padding: 0; }
  .feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
  }
  .eyebrow {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.14em;
    color: var(--surface-accent);
    margin-bottom: 20px;
  }
  .feature h2 { font-size: var(--fs-headline-400); line-height: 1.2; letter-spacing: -0.005em; font-weight: 800; }
  .feature p { margin: 20px 0 28px; font-size: var(--fs-body-500); color: var(--surface-muted-text); max-width: 44ch; }
  .feature .use-from { margin-top: 24px; font-size: 14px; color: var(--surface-muted-text); }
  .feature .use-from strong { color: var(--surface-text); font-weight: 600; }
  .feature-art {
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: var(--grad-accent);
    padding: 6px;
  }
  #pricing-2 .feature-art { order: -1; }
  .feature-art img { width: 100%; border-radius: 6px; aspect-ratio: 16/10; object-fit: cover; }

  /* ============ Stats ============ */
  .stats { padding: 96px 0; background: var(--ink-1); }
  .stats .head {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
    margin-bottom: 64px;
  }
  .stats .head h2 { font-size: var(--fs-headline-500); line-height: 1.15; letter-spacing: -0.015em; font-weight: 800; }
  .stats .head p { font-size: var(--fs-body-500); color: var(--surface-muted-text); max-width: 44ch; }
  .stats .label-sm { font-size: var(--fs-body-500); margin-bottom: 12px; }
  .stats-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 24px;
  }
  .stat {
    border-top: 1px solid #37538f;
    padding-top: 22px;
  }
  .stat .num {
    font-size: var(--fs-headline-400);
    font-weight: 800;
    letter-spacing: -0.005em;
    color: var(--surface-text);
  }
  .stat .num .unit { color: var(--purple-1); }
  .stat .label { margin-top: 8px; font-size: 15px; color: var(--surface-muted-text); }

  /* ============ Full service ============ */
  .fullservice { padding: 96px 0; background: var(--ink-1); }
  .fullservice-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
  }
  .fullservice h2 { font-size: var(--fs-headline-200); line-height: 1.3; font-weight: 700; }
  .fullservice .right { font-size: var(--fs-body-500); color: var(--surface-muted-text); max-width: 48ch; }
  .fullservice .link-underline {
    display: inline-block;
    margin-top: 24px;
    padding-bottom: 2px;
    border-bottom: 1px solid currentColor;
    font-size: var(--fs-body-500);
    transition: color var(--dur-medium) ease;
  }
  .fullservice .link-underline:hover { color: var(--surface-text); }

  /* ============ Testimonial ============ */
  .testimonial { padding: 96px 0; background: var(--ink-1); }
  .testimonial .label-sm { font-size: var(--fs-body-500); margin-bottom: 32px; }
  .testimonial blockquote {
    font-size: var(--fs-headline-400);
    line-height: 1.2;
    letter-spacing: -0.005em;
    font-weight: 700;
    max-width: 26ch;
  }
  .testimonial .attr { margin-top: 24px; font-size: var(--fs-body-500); color: var(--surface-muted-text); }

  /* ============ Resources ============ */
  .resources { padding: 0 0 96px; background: var(--ink-1); }
  .resources .head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 40px; }
  .resources .head h2 { font-size: var(--fs-headline-500); line-height: 1.15; letter-spacing: -0.015em; font-weight: 800; }
  .resources .head a { font-size: 15px; }
  .resources-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
  .article-card {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 8px 0 20px;
    border-bottom: 1px solid var(--surface-stroke);
  }
  .article-card .thumb { aspect-ratio: 1/1; border-radius: var(--radius-lg); overflow: hidden; background: var(--ink-2); }
  .article-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--dur-xlong) var(--ease-out); }
  .article-card:hover .thumb img { transform: scale(1.05); }
  .article-card .cat { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--purple-2); }
  .article-card h4 { font-size: 17px; font-weight: 600; line-height: 1.3; letter-spacing: -0.01em; }
  .article-card .meta { font-size: 13px; color: var(--surface-muted-text); }

  /* ============ Footer ============ */
  .footer { background: rgba(6, 38, 79, 0.5); border-top: 1px solid var(--surface-stroke); color: var(--ink-4); padding: 48px 0 10px; position: relative; z-index: 60; /* 高于文章目录侧栏(50)，不被其遮盖 */ }
  .footer-grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 28px;
    margin-bottom: 14px;
  }
  .footer .logo { color: var(--surface-text); }
  .footer .tagline { margin-top: 10px; font-size: 15px; max-width: 280px; }
  .footer h5 {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.10em;
    text-transform: uppercase;
    color: var(--surface-muted-text);
    margin-bottom: 14px;
  }
  .footer li { margin-bottom: 6px; }
  .footer li a { font-size: 15px; transition: color var(--dur-medium) ease; }
  .footer li a:hover { color: var(--surface-text); }
  .footer-bottom {
    border-top: none;
    padding-top: 0;
    display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 2px 24px;
    font-size: 12px;
    line-height: 1.4;
    color: var(--surface-muted-text);
  }
  .footer-bottom-links {
    display: flex; align-items: center; flex-wrap: wrap; gap: 8px 20px;
  }
  .footer-bottom-links a {
    color: var(--surface-muted-text);
    transition: color var(--dur-medium) ease;
  }
  .footer-bottom-links a:hover {
    color: var(--purple-2);
  }

  /* ============ AI 对话浮动按钮 ============ */
  .ai-float {
    position: fixed;
    right: 24px;
    bottom: 160px;
    z-index: 90;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--surface-text);
    background: rgba(6, 38, 79, 0.7);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--surface-stroke);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
    transition:
      transform var(--dur-medium) var(--ease-out),
      background var(--dur-medium) ease,
      border-color var(--dur-medium) ease;
  }
  .ai-float svg { width: 48px; height: 48px; }
  .ai-float:hover {
    background: rgba(6, 38, 79, 0.92);
    border-color: var(--purple-2);
    transform: translateY(-2px) scale(1.04);
  }

  /* ============ Responsive ============ */
  @media (max-width: 1024px) {
    .product-card { flex-basis: 30%; }
    .stats-grid { grid-template-columns: repeat(3, 1fr); }
    .resources-grid { grid-template-columns: repeat(2, 1fr); }
    .feature-grid { grid-template-columns: 1fr; }
  }
  @media (max-width: 768px) {
    .container { padding: 0 20px; }
    .nav { display: none; }
    .menu-btn { display: flex; }
    .hero { padding: 64px 0 16px; }
    .hero h1 { font-size: clamp(2.1rem, 9vw, 3.25rem); }
    .hero .sub { font-size: 1rem; margin-top: 20px; }
    .product-card { flex: 0 0 78%; }
    .stats .head, .fullservice-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .resources-grid { grid-template-columns: 1fr; }
    .feature { padding: 48px 28px; }
    #pricing-2 .feature-art { order: 0; }
    .header { transition: transform var(--dur-long) var(--ease-out); }
    .header.hide { transform: translateY(-100%); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
  }

  @media (prefers-reduced-motion: reduce) {
    [data-reveal] { opacity: 1; transform: none; transition: none; }
  }

  /* ============ 子页面通用 ============ */
  .page-hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 140px 0 72px;
    overflow: hidden;
  }
  /* 首页 Hero 背景样式：应用到所有子页面首屏（视频除外） */
  .page-hero::before {
    content: "";
    position: absolute;
    inset: -6%;
    z-index: 0;
    background:
      radial-gradient(55% 55% at 18% 18%, rgba(14, 67, 151, 0.45) 0%, transparent 62%),
      radial-gradient(50% 50% at 82% 28%, rgba(252, 81, 133, 0.22) 0%, transparent 60%),
      radial-gradient(60% 60% at 50% 100%, rgba(6, 20, 46, 0.9) 0%, transparent 65%);
    transform: translate3d(var(--bgx, 0px), var(--bgy, 0px), 0);
    transition: transform var(--dur-long) var(--ease-out);
    will-change: transform;
    pointer-events: none;
  }
  .page-hero .container { position: relative; z-index: 1; }
  /* 视频 Hero 除外 */
  .hero-video::before { display: none; }
  .page-hero h1 { font-size: var(--fs-headline-500); line-height: 1.15; color: var(--hero-title); max-width: 20ch; font-weight: 800; letter-spacing: -0.015em; }
  .page-hero .sub { max-width: 32em; margin-top: 20px; color: var(--surface-muted-text); font-size: var(--fs-headline-200); line-height: 1.6; }
  .page-hero .cta { margin-top: 32px; }
  .pad { padding: 96px 0; }
  .section-title h2 { font-size: var(--fs-headline-400); line-height: 1.2; color: var(--hero-title); max-width: 18ch; font-weight: 700; }
  .section-title .lead { max-width: 56ch; margin-top: 16px; color: var(--surface-muted-text); }
  .cards-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
  .cards-grid-2x2 { grid-template-columns: repeat(2, 1fr); }
  .card {
    background: var(--card-bg);
    border: 1px solid var(--surface-stroke);
    border-radius: var(--radius-2xl);
    padding: 28px;
    display: block;
    transition: transform var(--dur-long) var(--ease-out), background var(--dur-long) ease, border-color var(--dur-long) ease;
  }
  .card:hover { background: var(--card-hover); border-color: var(--surface-accent); transform: translateY(-4px); }
  .card .thumb { position: relative; aspect-ratio: 16 / 10; border-radius: var(--radius-xl); overflow: hidden; margin-bottom: 18px; }
  .card .thumb img { width: 100%; height: 100%; object-fit: cover; }
  /* 卡片缩略图顶部终端欢迎文字（Termux 风格） */
  .termux-welcome {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 2;
    margin: 0;
    padding: 12px 14px;
    font-family: 'JetBrains Mono', Consolas, 'Courier New', monospace;
    font-size: 12px;
    line-height: 1.45;
    color: #fc5185;
    text-shadow: 0 0 2px rgba(252, 81, 133, 0.95), 0 0 6px rgba(252, 81, 133, 0.4);
    overflow: hidden;
    white-space: pre;
    user-select: text;
  }
  .card h3 { font-size: var(--fs-headline-300); color: var(--surface-text); margin-bottom: 8px; font-weight: 600; }
  .card p { color: var(--surface-muted-text); font-size: 15px; }
  .split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
  .split h2 { font-size: var(--fs-headline-400); color: var(--hero-title); line-height: 1.2; font-weight: 700; margin-top: 12px; max-width: 18ch; }
  .split .lead { color: var(--surface-muted-text); margin-top: 16px; max-width: 46ch; }
  .split .art { border-radius: var(--radius-3xl); overflow: hidden; }
  .split .art img { width: 100%; height: 100%; object-fit: cover; }
  .big-num { font-family: var(--font-mono); color: var(--surface-accent); font-size: var(--fs-headline-500); font-weight: 500; }
  .mono-label { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--surface-muted-text); }
  .stat-item p { color: var(--surface-muted-text); margin-top: 6px; }
  .list li { padding: 14px 0; border-bottom: 1px solid var(--surface-stroke); color: var(--surface-muted-text); display: flex; gap: 14px; align-items: baseline; }
  .list li b { color: var(--surface-text); font-weight: 600; flex: 0 0 9em; }
  .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
  .faq-item { background: var(--card-bg); border: 1px solid var(--surface-stroke); border-radius: var(--radius-xl); padding: 24px; }
  .faq-item h4 { color: var(--surface-text); font-size: 17px; font-weight: 600; margin-bottom: 8px; }
  .faq-item p { color: var(--surface-muted-text); font-size: 15px; line-height: 1.7; }
  .cta-band { text-align: center; padding: 120px 0; }
  .cta-band h2 { font-size: var(--fs-headline-500); color: var(--hero-title); max-width: 18ch; margin: 0 auto 20px; }
  .cta-band p { color: var(--surface-muted-text); max-width: 100%; margin: 0 auto 32px; }
  @media (max-width: 1024px) {
    /* 窗口收窄：卡片网格统一纵向排列 */
    .cards-grid, .cards-grid-2x2 { grid-template-columns: 1fr; }
  }
  @media (max-width: 768px) {
    .page-hero { padding: 96px 0 48px; }
    .page-hero h1 { font-size: var(--fs-headline-300); }
    .split { grid-template-columns: 1fr; gap: 32px; }
    /* 图文段：移动端统一文字在上、图在下 */
    .split .art { order: 2; }
    .split h2, .section-title h2, .cta-band h2, .stats .head h2, .resources .head h2 { font-size: var(--fs-headline-300); }
    .big-num { font-size: var(--fs-headline-400); }
    .list li { align-items: flex-start; }
    .list li b { flex: 0 0 auto; width: 5.5em; }
    .feature-grid { gap: 32px; }
    .stats-grid { gap: 16px; }
    .faq-grid { gap: 16px; }
    .partner-logos { gap: 20px; }
    .faq-grid { grid-template-columns: 1fr; }
    .pad { padding: 64px 0; }
    .cta-band { padding: 80px 0; }
  }

  /* ============ 小屏移动端（≤480px） ============ */
  @media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero { padding: 48px 0 12px; }
    .hero h1 { font-size: 2rem; }
    .hero .sub { font-size: 0.95rem; }
    .feature { padding: 40px 20px; }
    .card { padding: 20px; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .page-hero { padding: 80px 0 40px; }
    .ai-float { right: 16px; bottom: 160px; width: 56px; height: 56px; }
    .ai-float svg { width: 40px; height: 40px; }
    .partner-logos span, .partner-logos a { font-size: 17px; }
    .cta-band { padding: 64px 0; }
  }

  /* ============ 动画交互增强 ============ */
  /* 首屏入场级联 */
  .hero .container > [data-reveal]:nth-child(1),
  .page-hero .container > [data-reveal]:nth-child(1) { transition-delay: 0.05s; }
  .hero .container > [data-reveal]:nth-child(2),
  .page-hero .container > [data-reveal]:nth-child(2) { transition-delay: 0.15s; }
  .hero .container > [data-reveal]:nth-child(3),
  .page-hero .container > [data-reveal]:nth-child(3) { transition-delay: 0.25s; }
  .hero .container > [data-reveal]:nth-child(4),
  .page-hero .container > [data-reveal]:nth-child(4) { transition-delay: 0.35s; }

  /* 网格卡片交错入场 */
  .cards-grid > :nth-child(1), .faq-grid > :nth-child(1), .stats-grid > :nth-child(1), .resources-grid > :nth-child(1) { transition-delay: 0s; }
  .cards-grid > :nth-child(2), .faq-grid > :nth-child(2), .stats-grid > :nth-child(2), .resources-grid > :nth-child(2) { transition-delay: 0.06s; }
  .cards-grid > :nth-child(3), .faq-grid > :nth-child(3), .stats-grid > :nth-child(3), .resources-grid > :nth-child(3) { transition-delay: 0.12s; }
  .cards-grid > :nth-child(4), .faq-grid > :nth-child(4), .stats-grid > :nth-child(4), .resources-grid > :nth-child(4) { transition-delay: 0.18s; }
  .cards-grid > :nth-child(5), .stats-grid > :nth-child(5) { transition-delay: 0.24s; }
  .stats-grid > :nth-child(6) { transition-delay: 0.3s; }

  /* 入场方向变体 */
  [data-reveal="left"] { transform: translateX(-48px); }
  [data-reveal="right"] { transform: translateX(48px); }
  [data-reveal="zoom"] { transform: scale(0.92); }
  [data-reveal="left"].is-visible,
  [data-reveal="right"].is-visible { transform: translateX(0); }
  [data-reveal="zoom"].is-visible { transform: scale(1); }

  /* 按钮：光泽扫过 + 按压回弹 */
  .btn { position: relative; overflow: hidden; --btn-shine: rgba(255,255,255,0.4); }
  .btn-primary { --btn-shine: rgba(252,81,133,0.4); }
  .btn {
    transition:
      background var(--dur-long) var(--ease-out),
      color var(--dur-long) var(--ease-out),
      border-color var(--dur-long) var(--ease-out),
      transform var(--dur-medium) var(--ease-out);
  }
  .btn::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(105deg, transparent 40%, var(--btn-shine) 50%, transparent 60%);
    transform: translateX(-130%);
    transition: transform 0.7s var(--ease-out);
    pointer-events: none;
  }
  .btn:hover::after { transform: translateX(130%); }
  .btn:active { transform: scale(0.97); }

  /* 卡片：悬停阴影 + 封面放大 + 3D 倾斜 */
  .card { transform-style: preserve-3d; }
  .card:hover {
    will-change: transform;
    box-shadow: 0 12px 24px rgba(0,0,0,0.35), 0 0 0 1px rgba(252,81,133,0.25);
  }
  .card .thumb img { transition: transform var(--dur-xlong) var(--ease-out); }
  .card:hover .thumb img { transform: scale(1.06); }

  /* AI 浮动按钮：脉冲光环 */
  .ai-float::after {
    content: "";
    position: absolute;
    inset: -8px;
    border-radius: 50%;
    border: 1.5px solid rgba(252, 81, 133, 0.55);
    opacity: 0;
    animation: ai-pulse 2.6s var(--ease-out) infinite;
    pointer-events: none;
  }
  @keyframes ai-pulse {
    0% { transform: scale(0.92); opacity: 0.8; }
    70% { transform: scale(1.4); opacity: 0; }
    100% { transform: scale(1.4); opacity: 0; }
  }

  /* 页头滚动加深 */
  .header {
    transition:
      transform var(--dur-long) var(--ease-out),
      background var(--dur-long) ease,
      box-shadow var(--dur-long) ease;
  }
  .header.is-scrolled {
    background: rgba(6, 38, 79, 0.85);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  }

  /* 伙伴 logo 悬停轻抬 */
  .partner-logos span, .partner-logos a {
    transition: opacity var(--dur-medium) ease, color var(--dur-medium) ease, transform var(--dur-medium) ease;
  }
  .partner-logos a:hover { transform: translateY(-2px); }

  /* 下划线链接滑动 */
  .fullservice .link-underline {
    transition: color var(--dur-medium) ease, transform var(--dur-medium) ease, letter-spacing var(--dur-medium) ease;
  }
  .fullservice .link-underline:hover { transform: translateX(4px); letter-spacing: 0.01em; }

  /* 滚动进度条（由 interactions.js 动态创建，transform 缩放避免每帧布局） */
  .scroll-progress {
    position: fixed;
    top: 0; left: 0;
    height: 3px;
    width: 100%;
    transform: scaleX(0);
    transform-origin: 0 0;
    background: var(--grad-accent);
    z-index: 300;
    pointer-events: none;
  }

  /* 数字等宽（滚动动画更稳） */
  .stat .num, .big-num { font-variant-numeric: tabular-nums; }

  /* 减弱动态 */
  @media (prefers-reduced-motion: reduce) {
    .ai-float::after { animation: none; }
    .btn::after { display: none; }
    .scroll-progress { display: none; }
    .card, .btn, .ai-float { transform: none !important; transition: none !important; }
  }

  /* ============ 全局隐藏滚动条（保留滚动功能） ============ */
  html {
    scrollbar-width: none;       /* Firefox */
    -ms-overflow-style: none;    /* 旧版 Edge / IE */
  }
  html::-webkit-scrollbar {
    width: 0;
    height: 0;
    display: none;               /* Chrome / Safari */
  }
  * {
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  *::-webkit-scrollbar {
    width: 0;
    height: 0;
    display: none;
  }

  /* ============ 法律条款页（privacy / terms） ============ */
  .legal-top { padding: 148px 0 0; }
  .legal-top h1 { font-size: var(--fs-headline-500); line-height: 1.2; color: var(--hero-title); font-weight: 800; letter-spacing: -0.015em; margin: 0; }
  .legal-top .meta-line { margin-top: 14px; color: var(--surface-muted-text); font-size: 0.85rem; }
  .legal-body { padding: 12px 0 110px; }
  .legal-top .container, .legal-body .container { max-width: 820px; }
  /* 法律页正文：容器改用 .wb-wrap（1536px）后需要单独收窄，否则行宽过长不宜阅读 */
  .wb-ed .legal-prose { max-width: 820px; margin-left: auto; margin-right: auto; }
  .legal-prose h2 { font-size: 1.3rem; line-height: 1.4; color: var(--hero-title); font-weight: 700; margin: 40px 0 10px; }
  .legal-prose h3 { font-size: 1.05rem; color: var(--hero-title); font-weight: 600; margin: 22px 0 6px; }
  .legal-prose p, .legal-prose li { color: var(--surface-muted-text); line-height: 1.85; font-size: 0.97rem; }
  .legal-prose p { margin: 12px 0; }
  .legal-prose ul, .legal-prose ol { padding-left: 1.5em; margin: 10px 0; }
  .legal-prose li { margin: 5px 0; }
  .legal-prose strong, .legal-prose b { color: var(--hero-title); font-weight: 600; }
  .legal-prose a { color: var(--surface-accent); text-decoration: underline; text-underline-offset: 3px; }
  .legal-prose code { font-family: var(--font-mono); font-size: 0.92em; background: var(--card-bg); border: 1px solid var(--surface-stroke); padding: 1px 6px; border-radius: 6px; color: var(--surface-accent); }
  .legal-prose .notice { margin: 20px 0; padding: 16px 20px; border: 1px solid var(--surface-stroke); border-left: 3px solid var(--surface-accent); border-radius: 12px; background: var(--card-bg); }
  @media (max-width: 640px) {
    .legal-top { padding: 116px 0 0; }
    .legal-prose h2 { font-size: 1.18rem; }
  }