/* ============================================================
       云漂 · 设计令牌（来自方案 §二）
       ============================================================ */
    :root {
      /* 主色 */
      --blue: #3D7EFF;
      --blue-deep: #2E6BE6;
      --blue-light: #EBF2FF;

      /* 辅助色 */
      --purple: #7B61FF;
      --purple-light: #F0EDFF;

      /* 强调 */
      --gold: #F5B041;
      --gold-deep: #E09A2B;

      /* 深色背景 */
      --bg-dark: #1A1B41;
      --bg-card: #1E293B;
      --bg-card-deep: rgba(30, 41, 59, 0.8);
      --bg-card-glow: rgba(30, 41, 59, 0.9);

      /* 文字 */
      --text-1: #FFFFFF;
      --text-2: #E2E8F0;
      --text-3: #94A3B8;
      --text-4: #64748B;

      /* 渐变 */
      --grad-brand: linear-gradient(135deg, #3D7EFF 0%, #7B61FF 100%);
      --grad-result: linear-gradient(135deg, #7B61FF 0%, #F5B041 100%);
      --grad-bg: linear-gradient(180deg, #1A1B41 0%, #2E2A5C 50%, #3D7EFF 100%);
      --grad-cta: linear-gradient(135deg, #7B61FF 0%, #F5B041 100%);

      /* 卡片 */
      --radius-card: 16px;
      --radius-btn: 12px;
      --shadow-dark: 0 8px 32px rgba(61, 126, 255, 0.15);
      --shadow-gold: 0 8px 40px rgba(245, 176, 65, 0.2);
    }

    /* ============================================================
       Reset & Base
       ============================================================ */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 72px;
    }

    body {
      font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
                   "Source Han Sans CN", "Noto Sans CJK SC",
                   -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                   "Helvetica Neue", Arial, sans-serif;
      background: var(--bg-dark);
      color: var(--text-2);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

    a { color: var(--blue); text-decoration: none; }
    a:hover { text-decoration: none; }

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

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .section { padding: 96px 0; position: relative; }
    .section-tight { padding: 64px 0; }

    .text-gold { color: var(--gold); }
    .text-blue { color: var(--blue); }
    .text-purple { color: var(--purple); }

    /* 通用动效：滚动进入视口 */
    .reveal {
      opacity: 0;
      transform: translateY(28px);
      transition: opacity 0.7s cubic-bezier(0.22, 0.61, 0.36, 1),
                  transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
    }
    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* ============================================================
       §3.1 导航栏
       ============================================================ */
    .nav {
      position: fixed;
      top: 0; left: 0; right: 0;
      height: 72px;
      z-index: 100;
      background: rgba(26, 27, 65, 0);
      backdrop-filter: blur(0);
      -webkit-backdrop-filter: blur(0);
      transition: background 0.3s ease, backdrop-filter 0.3s ease,
                  border-color 0.3s ease;
      border-bottom: 1px solid transparent;
    }

    .nav.scrolled {
      background: rgba(26, 27, 65, 0.9);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom-color: rgba(255, 255, 255, 0.06);
    }

    .nav-inner {
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 32px;
    }

    .nav-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text-1);
    }
    .nav-brand img { width: 32px; height: 32px; }
    .nav-brand-text { display: flex; flex-direction: column; line-height: 1.2; }
    .nav-brand-name {
      font-size: 18px;
      font-weight: 700;
      letter-spacing: -0.2px;
      color: var(--text-1);
    }
    .nav-brand-tag {
      font-size: 12px;
      color: var(--text-3);
      font-weight: 400;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-2);
      transition: color 0.2s;
      position: relative;
    }
    .nav-link:hover { color: var(--text-1); }
    .nav-link::after {
      content: '';
      position: absolute;
      left: 0; right: 100%; bottom: -4px;
      height: 2px;
      background: var(--grad-brand);
      transition: right 0.25s ease;
    }
    .nav-link:hover::after { right: 0; }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn-text {
      color: var(--blue);
      font-size: 15px;
      font-weight: 500;
      padding: 8px 4px;
    }
    .btn-text:hover { text-decoration: underline; }

    /* 按钮基础 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-size: 16px;
      font-weight: 600;
      transition: transform 0.25s ease, box-shadow 0.25s ease,
                  background 0.25s ease, color 0.25s ease;
      cursor: pointer;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--grad-brand);
      color: var(--text-1);
      box-shadow: 0 4px 16px rgba(61, 126, 255, 0.3);
    }
    .btn-primary:hover {
      transform: scale(1.02);
      box-shadow: 0 8px 28px rgba(61, 126, 255, 0.45);
    }
    .btn-ghost {
      background: transparent;
      color: var(--blue);
      border: 1.5px solid rgba(61, 126, 255, 0.45);
    }
    .btn-ghost:hover {
      background: rgba(61, 126, 255, 0.12);
      border-color: var(--blue);
    }
    .btn-gold {
      background: var(--gold);
      color: #0F172A;
      box-shadow: 0 4px 16px rgba(245, 176, 65, 0.35);
    }
    .btn-gold:hover {
      transform: scale(1.02);
      box-shadow: 0 8px 28px rgba(245, 176, 65, 0.55);
    }

    /* 移动端汉堡菜单 */
    .nav-toggle {
      display: none;
      width: 40px;
      height: 40px;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 5px;
      color: var(--text-1);
    }
    .nav-toggle span {
      display: block;
      width: 22px;
      height: 2px;
      background: currentColor;
      transition: transform 0.3s, opacity 0.3s;
    }
    .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .nav-toggle.open span:nth-child(2) { opacity: 0; }
    .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    .nav-mobile {
      display: none;
      position: fixed;
      top: 72px;
      left: 0; right: 0;
      background: rgba(26, 27, 65, 0.98);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      padding: 24px;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .nav-mobile.open { display: block; }
    .nav-mobile a {
      display: block;
      padding: 14px 0;
      font-size: 16px;
      color: var(--text-2);
      border-bottom: 1px solid rgba(255,255,255,0.04);
    }
    .nav-mobile a:last-child { border-bottom: none; }
    .nav-mobile-cta {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 16px;
    }

    /* ============================================================
       §3.2 Hero
       ============================================================ */
    .hero {
      position: relative;
      padding: 152px 0 80px;
      background: var(--grad-bg);
      overflow: hidden;
      text-align: center;
    }

    /* 极淡云层流动粒子 */
    .hero-bg {
      position: absolute;
      inset: 0;
      pointer-events: none;
      overflow: hidden;
    }
    .hero-cloud {
      position: absolute;
      border-radius: 50%;
      filter: blur(60px);
      opacity: 0.5;
      animation: drift 12s ease-in-out infinite;
    }
    .hero-cloud-1 {
      width: 480px; height: 480px;
      background: radial-gradient(circle, rgba(61,126,255,0.45), transparent 70%);
      top: -120px; left: -120px;
      animation-delay: 0s;
    }
    .hero-cloud-2 {
      width: 600px; height: 600px;
      background: radial-gradient(circle, rgba(123,97,255,0.35), transparent 70%);
      top: 30%; right: -200px;
      animation-delay: -4s;
    }
    .hero-cloud-3 {
      width: 420px; height: 420px;
      background: radial-gradient(circle, rgba(245,176,65,0.22), transparent 70%);
      bottom: -180px; left: 35%;
      animation-delay: -8s;
    }
    @keyframes drift {
      0%, 100% { transform: translate(0, 0) scale(1); }
      50% { transform: translate(40px, -30px) scale(1.08); }
    }

    .hero-eyebrow {
      font-size: 14px;
      font-weight: 500;
      letter-spacing: 0.08em;
      color: var(--text-3);
      margin-bottom: 24px;
      display: inline-flex;
      align-items: center;
      gap: 12px;
    }
    .hero-eyebrow::before,
    .hero-eyebrow::after {
      content: '';
      width: 24px;
      height: 1px;
      background: var(--text-3);
    }

    .hero h1 {
      font-size: clamp(40px, 7vw, 56px);
      font-weight: 700;
      letter-spacing: -1.5px;
      line-height: 1.15;
      color: var(--text-1);
      margin-bottom: 24px;
    }
    .hero h1 .accent {
      background: linear-gradient(135deg, #F5B041, #E09A2B);
      -webkit-background-clip: text;
      background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: clamp(16px, 2vw, 18px);
      color: var(--text-2);
      max-width: 620px;
      margin: 0 auto 40px;
      line-height: 1.7;
    }

    .hero-ctas {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-bottom: 64px;
    }

    .hero-mockup {
      max-width: 900px;
      margin: 0 auto;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow:
        0 0 0 1px rgba(123, 97, 255, 0.15),
        0 30px 80px rgba(61, 126, 255, 0.3),
        0 0 60px rgba(123, 97, 255, 0.15);
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-5px); }
    }

    /* ============================================================
       §3.3 Trust Bar
       ============================================================ */
    .trust {
      background: rgba(30, 41, 59, 0.5);
      padding: 48px 0;
      border-top: 1px solid rgba(255,255,255,0.04);
      border-bottom: 1px solid rgba(255,255,255,0.04);
    }
    .trust-text {
      text-align: center;
      font-size: 16px;
      color: var(--text-3);
      margin-bottom: 24px;
    }
    .trust-text .num {
      color: var(--text-1);
      font-weight: 700;
      font-size: 18px;
    }
    .trust-logos {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .trust-logo {
      filter: grayscale(1);
      opacity: 0.6;
      transition: filter 0.3s, opacity 0.3s;
    }
    .trust-logo:hover {
      filter: grayscale(0);
      opacity: 1;
    }

    /* ============================================================
       §3.4 Bento 网格
       ============================================================ */
    .section-features {
      background: var(--bg-dark);
    }
    .section-eyebrow {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      letter-spacing: 0.08em;
      color: var(--blue);
      text-transform: uppercase;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: clamp(28px, 4vw, 36px);
      font-weight: 700;
      color: var(--text-1);
      letter-spacing: -1px;
      line-height: 1.25;
      margin-bottom: 16px;
    }
    .section-sub {
      font-size: 17px;
      color: var(--text-2);
      max-width: 720px;
      margin: 0 auto 56px;
      line-height: 1.7;
    }
    .section-head {
      text-align: center;
      margin-bottom: 56px;
    }

    .bento {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .bento-card {
      background: var(--bg-card-deep);
      border: 1px solid rgba(61, 126, 255, 0.2);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      transition: transform 0.3s ease, border-color 0.3s ease,
                  box-shadow 0.3s ease;
      position: relative;
      overflow: hidden;
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
    }
    .bento-card:hover {
      transform: translateY(-4px);
      border-color: rgba(123, 97, 255, 0.6);
      box-shadow: var(--shadow-dark);
    }
    .bento-card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--grad-brand);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    .bento-card-icon svg { width: 24px; height: 24px; stroke: #fff; fill: none; stroke-width: 2; }
    .bento-card-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-1);
      margin-bottom: 10px;
      letter-spacing: -0.2px;
    }
    .bento-card-desc {
      font-size: 14px;
      color: var(--text-3);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .bento-card-visual {
      width: 100%;
      border-radius: 12px;
      overflow: hidden;
      background: var(--bg-card);
      aspect-ratio: 16 / 9;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .bento-card-visual img { width: 100%; height: 100%; object-fit: cover; }

    /* ============================================================
       §3.5 工作流交错
       ============================================================ */
    .workflow { background: var(--bg-dark); }

    .workflow-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
      margin-bottom: 96px;
    }
    .workflow-row:last-child { margin-bottom: 0; }
    .workflow-row.flip { direction: rtl; }
    .workflow-row.flip > * { direction: ltr; }

    .workflow-text .section-eyebrow {
      color: var(--purple);
      margin-bottom: 16px;
    }
    .workflow-text .workflow-title {
      font-size: clamp(24px, 3vw, 28px);
      font-weight: 700;
      color: var(--text-1);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .workflow-text .workflow-desc {
      font-size: 16px;
      color: var(--text-2);
      line-height: 1.75;
      margin-bottom: 20px;
    }
    .workflow-link {
      font-size: 14px;
      font-weight: 600;
      color: var(--blue);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: gap 0.2s;
    }
    .workflow-link:hover { gap: 10px; }

    .workflow-visual {
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 20px 60px rgba(61, 126, 255, 0.18);
    }

    /* ============================================================
       §3.6 套餐定价
       ============================================================ */
    .pricing {
      background: var(--grad-bg);
      background-attachment: fixed;
    }
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .plan {
      background: var(--bg-card-deep);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      position: relative;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .plan:hover { transform: translateY(-4px); }
    .plan.featured {
      border: 2px solid var(--gold);
      background: var(--bg-card-glow);
      transform: scale(1.02);
      animation: glow 3s ease-in-out infinite;
    }
    @keyframes glow {
      0%, 100% { box-shadow: 0 0 0 rgba(245, 176, 65, 0); }
      50% { box-shadow: 0 8px 32px rgba(245, 176, 65, 0.35); }
    }
    .plan-badge {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      padding: 4px 16px;
      background: var(--gold);
      color: #0F172A;
      font-size: 12px;
      font-weight: 700;
      border-radius: 999px;
      letter-spacing: 0.04em;
    }
    .plan-name {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-1);
      margin-bottom: 6px;
    }
    .plan-tag {
      font-size: 13px;
      color: var(--text-3);
      margin-bottom: 20px;
    }
    .plan-price {
      display: flex;
      align-items: baseline;
      gap: 6px;
      margin-bottom: 4px;
    }
    .plan-price .num {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-1);
      letter-spacing: -1px;
    }
    .plan-price .unit {
      font-size: 14px;
      color: var(--text-3);
    }
    .plan-yearly {
      font-size: 13px;
      color: var(--text-3);
      font-weight: 500;
      white-space: nowrap;
    }
    .plan-price.custom .num { font-size: 24px; }
    .plan-billing {
      font-size: 12px;
      color: var(--text-3);
      margin-bottom: 24px;
    }
    .plan-features {
      list-style: none;
      margin-bottom: 28px;
    }
    .plan-features li {
      font-size: 14px;
      color: var(--text-2);
      line-height: 1.7;
      padding: 6px 0;
      display: flex;
      align-items: flex-start;
      gap: 8px;
    }
    .plan-features li::before {
      content: '✓';
      color: var(--gold);
      font-weight: 700;
      flex-shrink: 0;
    }
    .plan-cta {
      display: block;
      width: 100%;
      text-align: center;
      padding: 12px 20px;
      border-radius: var(--radius-btn);
      font-size: 15px;
      font-weight: 600;
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .plan-cta.primary {
      background: var(--grad-brand);
      color: var(--text-1);
    }
    .plan-cta.primary:hover { transform: scale(1.02); }
    .plan-cta.gold {
      background: var(--gold);
      color: #0F172A;
    }
    .plan-cta.gold:hover { transform: scale(1.02); box-shadow: 0 6px 24px rgba(245,176,65,0.4); }
    .plan-cta.ghost {
      background: transparent;
      color: var(--blue);
      border: 1.5px solid rgba(61, 126, 255, 0.4);
    }
    .plan-cta.ghost:hover { background: rgba(61, 126, 255, 0.1); }
    .pricing-foot {
      text-align: center;
      margin-top: 32px;
      font-size: 13px;
      color: var(--text-3);
    }

    /* ============================================================
       §3.7 下载中心
       ============================================================ */
    .download {
      background: var(--bg-dark);
    }
    .download-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .download-card {
      background: var(--bg-card-deep);
      border: 1px solid rgba(61, 126, 255, 0.18);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
    }
    .download-card:hover {
      transform: translateY(-4px);
      border-color: rgba(123, 97, 255, 0.5);
      box-shadow: var(--shadow-dark);
    }
    .download-card .platform {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-1);
      margin-bottom: 20px;
    }
    .qr-wrap {
      width: 120px;
      height: 120px;
      background: #fff;
      border-radius: 8px;
      padding: 8px;
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: transform 0.3s;
    }
    .download-card:hover .qr-wrap { transform: scale(1.05); }
    .qr-wrap img { width: 100%; height: 100%; border-radius: 4px; }
    .download-action {
      font-size: 14px;
      color: var(--text-2);
      margin-bottom: 12px;
      display: inline-block;
      text-decoration: none;
      transition: color 0.2s;
    }
    a.download-action:hover { color: var(--gold); text-decoration: none; }
    .download-meta {
      font-size: 12px;
      color: var(--text-4);
      line-height: 1.7;
    }
    /* 未开通端:敬请期待层 */
    .release-coming {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 12px;
      min-height: 220px;
      padding: 8px 0;
    }
    .release-coming-badge {
      font-size: 14px;
      font-weight: 700;
      color: var(--gold);
      border: 1.5px solid rgba(245, 176, 65, 0.5);
      border-radius: 999px;
      padding: 6px 18px;
      letter-spacing: 0.06em;
    }
    .release-coming-text {
      font-size: 13px;
      color: var(--text-3);
    }
    .download-card.release-disabled {
      border-color: rgba(255, 255, 255, 0.08);
      opacity: 0.85;
    }
    .download-card.release-disabled:hover {
      transform: none;
      border-color: rgba(255, 255, 255, 0.08);
      box-shadow: none;
    }

    /* ============================================================
       §3.8 用户评价
       ============================================================ */
    .testimonials {
      background: rgba(30, 41, 59, 0.4);
    }
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .testimonial {
      background: var(--bg-card-deep);
      border: 1px solid rgba(61, 126, 255, 0.18);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      transition: transform 0.3s, border-color 0.3s;
    }
    .testimonial:hover {
      transform: translateY(-4px);
      border-color: rgba(123, 97, 255, 0.5);
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    .testimonial-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      flex-shrink: 0;
    }
    .testimonial-name {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-1);
      margin-bottom: 2px;
    }
    .testimonial-role {
      font-size: 13px;
      color: var(--text-3);
    }
    .testimonial-quote {
      font-size: 15px;
      color: var(--text-2);
      font-style: italic;
      line-height: 1.75;
      margin-bottom: 16px;
    }
    /* 量化数据金色高亮(用户评价里的具体数字) */
    .hl-gold {
      color: var(--gold);
      font-weight: 700;
      font-style: normal;
      font-family: "PingFang SC", "Noto Sans SC", sans-serif;
    }
    .testimonial-stars {
      color: var(--gold);
      font-size: 14px;
      letter-spacing: 2px;
    }

    /* ============================================================
       §3.9 FAQ
       ============================================================ */
    .faq { background: var(--bg-dark); }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-contact-cta {
      max-width: 800px;
      margin: 32px auto 0;
      padding: 32px;
      text-align: center;
      background: var(--bg-card-deep);
      border: 1px dashed rgba(245, 176, 65, 0.35);
      border-radius: 16px;
    }
    .faq-contact-cta p {
      font-size: 16px;
      color: var(--text-2);
      margin-bottom: 16px;
    }
    .faq-contact-cta .btn {
      padding: 12px 32px;
    }
    .faq-item {
      background: var(--bg-card-deep);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: border-color 0.3s;
    }
    .faq-item:hover { border-color: rgba(123, 97, 255, 0.4); }
    .faq-q {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 20px 24px;
      color: var(--text-1);
      font-size: 16px;
      font-weight: 500;
      text-align: left;
    }
    .faq-icon {
      width: 24px;
      height: 24px;
      flex-shrink: 0;
      position: relative;
      transition: transform 0.3s;
    }
    .faq-icon::before,
    .faq-icon::after {
      content: '';
      position: absolute;
      background: var(--text-2);
      transition: transform 0.3s, opacity 0.3s;
    }
    .faq-icon::before {
      left: 4px; right: 4px; top: 11px;
      height: 2px;
    }
    .faq-icon::after {
      top: 4px; bottom: 4px; left: 11px;
      width: 2px;
    }
    .faq-item.open .faq-icon { transform: rotate(45deg); }
    .faq-item.open .faq-icon::after { opacity: 0; }
    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-in-out;
    }
    .faq-a-inner {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-3);
      line-height: 1.75;
    }

    /* ============================================================
       §3.10 Final CTA
       ============================================================ */
    .final-cta {
      position: relative;
      padding: 120px 0;
      text-align: center;
      overflow: hidden;
      background: radial-gradient(ellipse 60% 80% at 50% 50%, rgba(123, 97, 255, 0.3) 0%, transparent 60%),
                  var(--bg-dark);
    }
    .final-cta::before {
      content: '';
      position: absolute;
      inset: 0;
      background: var(--grad-cta);
      opacity: 0.08;
      pointer-events: none;
    }
    .final-cta h2 {
      font-size: clamp(36px, 5vw, 48px);
      font-weight: 700;
      color: var(--text-1);
      letter-spacing: -1.5px;
      margin-bottom: 16px;
      position: relative;
    }
    .final-cta p {
      font-size: 18px;
      color: var(--text-2);
      margin-bottom: 40px;
      position: relative;
    }
    .btn-cta-big {
      position: relative;
      padding: 20px 64px;
      font-size: 18px;
      border-radius: var(--radius-btn);
      background: var(--grad-cta);
      color: #0F172A;
      font-weight: 700;
      box-shadow: 0 8px 32px rgba(245, 176, 65, 0.35);
      animation: cta-glow 3s ease-in-out infinite;
    }
    @keyframes cta-glow {
      0%, 100% { box-shadow: 0 8px 24px rgba(245, 176, 65, 0.3); }
      50% { box-shadow: 0 8px 48px rgba(245, 176, 65, 0.6); }
    }
    .btn-cta-big:hover { transform: scale(1.03); }

    /* ============================================================
       §3.11 Footer
       ============================================================ */
    footer {
      background: #0F172A;
      padding: 56px 0 28px;
      color: var(--text-3);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 12px;
    }
    .footer-brand img { width: 28px; height: 28px; }
    .footer-brand .name {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-1);
    }
    .footer-tagline {
      font-size: 13px;
      color: var(--text-3);
      margin-bottom: 16px;
    }
    .footer-contact { font-size: 13px; }
    .footer-contact a { color: var(--text-2); }
    .footer-col h4 {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-1);
      margin-bottom: 16px;
      letter-spacing: 0.04em;
    }
    .footer-col ul { list-style: none; }
    .footer-col li { padding: 6px 0; }
    .footer-col a {
      font-size: 13px;
      color: var(--text-3);
      transition: color 0.2s;
    }
    .footer-col a:hover { color: var(--text-1); }
    .footer-social {
      display: flex;
      gap: 12px;
    }
    .footer-social a {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: rgba(255,255,255,0.05);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-3);
      transition: background 0.2s, color 0.2s;
    }
    .footer-social a:hover {
      background: var(--grad-brand);
      color: var(--text-1);
    }
    .footer-bottom {
      padding-top: 24px;
      border-top: 1px solid rgba(255,255,255,0.06);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 12px;
      color: var(--text-4);
    }

    /* ============================================================
       响应式
       ============================================================ */
    @media (max-width: 1199px) {
      .nav-links { gap: 20px; }
      .pricing-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 767px) {
      .container { padding: 0 20px; }
      .section { padding: 64px 0; }
      .section-head { margin-bottom: 36px; }

      .nav-links, .nav-cta { display: none; }
      .nav-toggle { display: flex; }

      .hero { padding: 120px 0 56px; }
      .hero h1 { letter-spacing: -1px; }
      .hero-ctas { flex-direction: column; align-items: stretch; padding: 0 16px; }
      .hero-ctas .btn { width: 100%; }

      .trust-logos { gap: 24px; }
      .trust-logo img { height: 22px; }

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

      .workflow-row {
        grid-template-columns: 1fr;
        gap: 32px;
        margin-bottom: 64px;
      }
      .workflow-row.flip { direction: ltr; }
      .workflow-visual { order: -1; }

      .pricing-grid { grid-template-columns: 1fr; }
      .plan.featured { transform: none; }

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

      .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
      .footer-brand { grid-column: 1 / -1; }
    }

    @media (max-width: 480px) {
      .footer-grid { grid-template-columns: 1fr; }
    }

    /* 可访问性：减少动效 */
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
      }
    }
/* ============================================================
   子页面（隐私 / 条款 / 关于）专用样式
   ============================================================ */
.page-hero {
  position: relative;
  padding: 152px 0 56px;
  background: linear-gradient(180deg, #1A1B41 0%, #2E2A5C 100%);
  text-align: center;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 60% at 50% 40%, rgba(123, 97, 255, 0.25), transparent 70%);
  pointer-events: none;
}
.page-hero h1 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -1.5px;
  margin-bottom: 16px;
  position: relative;
}
.page-hero p {
  font-size: 16px;
  color: var(--text-3);
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}
.page-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 20px;
  font-size: 13px;
  color: var(--text-3);
  position: relative;
}
.page-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.page-meta strong { color: var(--text-2); font-weight: 600; }

.doc-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 56px;
  padding: 80px 0 96px;
  max-width: 1100px;
  margin: 0 auto;
}
.doc-toc {
  position: sticky;
  top: 96px;
  align-self: start;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  padding-right: 8px;
}
.doc-toc h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.doc-toc ul {
  list-style: none;
  border-left: 1px solid rgba(255,255,255,0.08);
}
.doc-toc li { padding: 0; }
.doc-toc a {
  display: block;
  padding: 8px 0 8px 14px;
  font-size: 13px;
  color: var(--text-3);
  border-left: 2px solid transparent;
  margin-left: -1px;
  transition: color 0.2s, border-color 0.2s;
}
.doc-toc a:hover { color: var(--text-2); border-left-color: rgba(123, 97, 255, 0.5); }
.doc-toc a.active { color: var(--blue); border-left-color: var(--blue); }

.doc-content {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-2);
}
.doc-content h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-1);
  margin: 48px 0 16px;
  padding-top: 16px;
  letter-spacing: -0.3px;
  scroll-margin-top: 96px;
}
.doc-content h2:first-of-type { margin-top: 0; padding-top: 0; }
.doc-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-1);
  margin: 32px 0 12px;
  scroll-margin-top: 96px;
}
.doc-content p { margin-bottom: 16px; }
.doc-content ul, .doc-content ol {
  margin: 12px 0 20px 24px;
  padding-left: 8px;
}
.doc-content li { margin-bottom: 6px; }
.doc-content strong { color: var(--text-1); }
.doc-content code {
  font-family: "JetBrains Mono", "SF Mono", "Consolas", monospace;
  background: rgba(123, 97, 255, 0.12);
  color: #C4B5FD;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
}
.doc-content a { color: var(--blue); text-decoration: underline; }
.doc-content a:hover { color: #60A5FA; }

.doc-callout {
  background: rgba(123, 97, 255, 0.08);
  border-left: 3px solid var(--purple);
  padding: 16px 20px;
  border-radius: 8px;
  margin: 24px 0;
  color: var(--text-2);
}
.doc-callout strong { color: var(--text-1); }

.doc-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.06);
  margin: 48px 0;
}

.doc-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 14px;
}
.doc-table th, .doc-table td {
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  text-align: left;
  vertical-align: top;
}
.doc-table th {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-1);
  font-weight: 600;
}
.doc-table td { color: var(--text-2); }

/* 关于页（about） */
.about-section { padding: 80px 0; }
.about-section + .about-section { padding-top: 0; }

.about-hero h1 {
  font-size: clamp(36px, 5vw, 48px);
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -1.5px;
  margin-bottom: 20px;
}
.about-hero p.lead {
  font-size: 18px;
  color: var(--text-2);
  max-width: 720px;
  line-height: 1.7;
  margin-bottom: 12px;
}
.about-hero p.lead .lead-tagline {
  display: inline-block;
  margin-top: 6px;
  padding: 6px 14px;
  background: linear-gradient(135deg, rgba(61,126,255,0.12), rgba(123,97,255,0.12));
  border: 1px solid rgba(123,97,255,0.3);
  border-radius: 999px;
  font-weight: 600;
  font-size: 16px;
  color: var(--text-1);
  letter-spacing: 0.04em;
}
.about-hero p.tagline {
  font-size: 14px;
  color: var(--text-3);
  font-style: italic;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 32px;
}
.value-card {
  background: var(--bg-card-deep);
  border: 1px solid rgba(61, 126, 255, 0.18);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  transition: transform 0.3s, border-color 0.3s;
}
.value-card:hover {
  transform: translateY(-4px);
  border-color: rgba(123, 97, 255, 0.5);
}
.value-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--grad-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.value-icon svg { width: 22px; height: 22px; stroke: #fff; fill: none; stroke-width: 2; }
.value-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 8px;
}
.value-card p {
  font-size: 14px;
  color: var(--text-3);
  line-height: 1.7;
}

.timeline {
  position: relative;
  padding-left: 32px;
  margin-top: 32px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--blue), var(--purple), var(--gold));
  border-radius: 2px;
}
.timeline-item {
  position: relative;
  padding: 0 0 32px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-dark);
  border: 3px solid var(--purple);
  box-shadow: 0 0 12px rgba(123, 97, 255, 0.5);
}
.timeline-date {
  font-size: 13px;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 4px;
}
.timeline-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 6px;
}
.timeline-desc {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 32px;
}
.team-card {
  background: var(--bg-card-deep);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-card);
  padding: 24px 20px;
  text-align: center;
  transition: transform 0.3s, border-color 0.3s;
}
.team-card:hover {
  transform: translateY(-4px);
  border-color: rgba(123, 97, 255, 0.5);
}
.team-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: var(--grad-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--text-1);
  font-weight: 700;
}
.team-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 4px;
}
.team-role {
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 12px;
}
.team-bio {
  font-size: 13px;
  color: var(--text-3);
  line-height: 1.6;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 32px;
}
.contact-card {
  background: var(--bg-card-deep);
  border: 1px solid rgba(61, 126, 255, 0.18);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  text-align: center;
}
.contact-card .label {
  font-size: 12px;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}
.contact-card .value {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
}
.contact-card .value a { color: var(--text-1); }
.contact-card .value a:hover { color: var(--blue); text-decoration: underline; }

@media (max-width: 1199px) {
  .team-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 767px) {
  .doc-layout {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 56px 0;
  }
  .doc-toc {
    position: static;
    max-height: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding-bottom: 20px;
    margin-bottom: 16px;
  }
  .doc-toc ul {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    border-left: none;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding-bottom: 8px;
  }
  .doc-toc li { flex: none; }
  .doc-toc a {
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 6px 12px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.04);
    margin-left: 0;
  }
  .doc-toc a.active {
    color: var(--text-1);
    background: var(--grad-brand);
    border-bottom-color: transparent;
  }
  .values-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .team-grid { grid-template-columns: 1fr; }
}