:root {
      --bg-base: #f9fafc;
      --bg-soft: #f2f6ff;
      --card-bg: #ffffff;
      --ink-strong: #0d1b2a;
      --ink-body: #1f2e3f;
      --ink-soft: #4f5e6f;
      --border-light: #e4eaf2;
      --primary: #1860f2;
      --primary-dark: #0f4bd0;
      --primary-soft: #e8efff;
      --accent: #ff7a45;
      --accent-soft: #fff1ea;
      --success: #13b981;
      --radius-sm: 10px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --shadow-sm: 0 2px 12px rgba(13, 27, 42, 0.04);
      --shadow-md: 0 8px 28px rgba(13, 27, 42, 0.07);
      --shadow-lg: 0 16px 48px rgba(13, 27, 42, 0.10);
      --container: 1180px;
      --gap: 24px;
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      background: var(--bg-base);
      color: var(--ink-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img { display: block; max-width: 100%; height: auto; }
    a { color: inherit; text-decoration: none; }
    ul { list-style: none; }
    .container {
      width: 100%;
      max-width: var(--container);
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* ---------- header ---------- */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-light);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      min-height: 68px;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }
    .ai-page-logo {
      display: block;
      width: auto;
      max-height: 38px;
      width: auto;
    }
    .brand-name {
      font-size: 20px;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: var(--ink-strong);
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 15px;
      color: var(--ink-body);
      border-radius: 8px;
      transition: color 0.2s, background 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover { color: var(--primary); background: var(--primary-soft); }
    .header-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--primary);
      color: #fff;
      font-weight: 600;
      font-size: 15px;
      padding: 10px 22px;
      border-radius: 100px;
      white-space: nowrap;
      transition: background 0.2s, transform 0.2s;
      border: none;
      cursor: pointer;
    }
    .header-cta:hover { background: var(--primary-dark); transform: translateY(-1px); }
    .menu-toggle {
      display: none;
      width: 42px;
      height: 42px;
      border-radius: 10px;
      border: 1px solid var(--border-light);
      background: #fff;
      cursor: pointer;
      align-items: center;
      justify-content: center;
      flex-direction: column;
      gap: 5px;
      transition: background 0.2s;
    }
    .menu-toggle span {
      display: block;
      width: 20px;
      height: 2px;
      border-radius: 2px;
      background: var(--ink-strong);
      transition: 0.25s;
    }
    .menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .menu-toggle.active span:nth-child(2) { opacity: 0; }
    .menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
    .mobile-nav {
      display: none;
      flex-direction: column;
      padding: 12px 24px 20px;
      background: #fff;
      border-bottom: 1px solid var(--border-light);
      gap: 4px;
    }
    .mobile-nav.open { display: flex; }
    .mobile-nav a {
      padding: 10px 12px;
      border-radius: 8px;
      color: var(--ink-body);
      font-size: 15px;
    }
    .mobile-nav a:hover { background: var(--bg-soft); color: var(--primary); }
    /* ---------- hero ---------- */
    .hero {
      position: relative;
      padding: 80px 0 68px;
      background:
        radial-gradient(ellipse 70% 60% at 80% 10%, rgba(24,96,242,0.08) 0%, transparent 60%),
        radial-gradient(ellipse 50% 50% at 10% 80%, rgba(255,122,69,0.07) 0%, transparent 55%),
        linear-gradient(180deg, #f3f7ff 0%, #f9fafc 100%);
      overflow: hidden;
    }
    .hero::before, .hero::after {
      content: "";
      position: absolute;
      border-radius: 50%;
      pointer-events: none;
      z-index: 0;
    }
    .hero::before {
      width: 420px; height: 420px;
      background: radial-gradient(circle, rgba(24,96,242,0.10), transparent 70%);
      top: -120px; right: -80px;
    }
    .hero::after {
      width: 320px; height: 320px;
      background: radial-gradient(circle, rgba(255,122,69,0.09), transparent 70%);
      bottom: -100px; left: -60px;
    }
    .hero-inner {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      border-radius: 100px;
      background: #fff;
      border: 1px solid var(--border-light);
      color: var(--primary);
      font-size: 14px;
      font-weight: 600;
      box-shadow: var(--shadow-sm);
      margin-bottom: 22px;
      animation: fadeUp 0.6s ease both;
    }
    .hero-badge .dot {
      width: 8px; height: 8px; border-radius: 50%;
      background: var(--success);
      box-shadow: 0 0 0 3px rgba(19,185,129,0.18);
    }
    .hero h1 {
      font-size: clamp(30px, 4.4vw, 48px);
      line-height: 1.25;
      color: var(--ink-strong);
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      animation: fadeUp 0.7s 0.08s ease both;
    }
    .hero h1 em {
      font-style: normal;
      color: var(--primary);
      position: relative;
    }
    .hero-desc {
      font-size: 17px;
      color: var(--ink-soft);
      max-width: 560px;
      margin-bottom: 30px;
      animation: fadeUp 0.7s 0.16s ease both;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 34px;
      animation: fadeUp 0.7s 0.24s ease both;
    }
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: var(--primary);
      color: #fff;
      font-size: 16px;
      font-weight: 700;
      padding: 14px 34px;
      border-radius: 100px;
      border: none;
      cursor: pointer;
      box-shadow: 0 6px 20px rgba(24,96,242,0.28);
      transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
    }
    .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 10px 28px rgba(24,96,242,0.32); }
    .btn-primary:active { transform: translateY(0); }
    .btn-ghost {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: #fff;
      color: var(--ink-strong);
      font-size: 16px;
      font-weight: 600;
      padding: 13px 30px;
      border-radius: 100px;
      border: 1.5px solid var(--border-light);
      cursor: pointer;
      transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
    }
    .btn-ghost:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
    .hero-metrics {
      display: flex;
      flex-wrap: wrap;
      gap: 28px;
      animation: fadeUp 0.7s 0.32s ease both;
    }
    .hero-metric strong {
      display: block;
      font-size: 24px;
      font-weight: 800;
      color: var(--ink-strong);
      line-height: 1.2;
    }
    .hero-metric span {
      font-size: 13px;
      color: var(--ink-soft);
    }
    /* hero card */
    .hero-card {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(255,255,255,0.9);
      animation: fadeUp 0.8s 0.2s ease both;
      position: relative;
    }
    .hero-card h3 {
      font-size: 18px;
      color: var(--ink-strong);
      margin-bottom: 18px;
      font-weight: 700;
    }
    .model-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .model-tag {
      background: var(--bg-soft);
      color: var(--ink-body);
      font-size: 13px;
      padding: 6px 12px;
      border-radius: 100px;
      font-weight: 500;
      transition: background 0.2s, color 0.2s;
    }
    .model-tag:hover { background: var(--primary-soft); color: var(--primary); }
    .hero-card .divider {
      height: 1px;
      background: var(--border-light);
      margin: 22px 0;
    }
    .mini-price-row {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      gap: 12px;
      font-size: 14px;
      color: var(--ink-soft);
      margin-bottom: 8px;
    }
    .mini-price-row strong { color: var(--ink-strong); font-weight: 700; font-size: 16px; }
    .mini-price-row .low { color: var(--success); font-weight: 600; }
    .hero-card .tip {
      margin-top: 16px;
      font-size: 13px;
      color: var(--ink-soft);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .hero-card .tip::before {
      content: "";
      width: 6px; height: 6px; border-radius: 50%;
      background: var(--accent);
    }
    /* ---------- section shared ---------- */
    .section {
      padding: 76px 0;
    }
    .section-head {
      max-width: 760px;
      margin-bottom: 44px;
    }
    .section-eyebrow {
      display: inline-block;
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      margin-bottom: 12px;
    }
    .section-head h2 {
      font-size: clamp(24px, 3.2vw, 34px);
      color: var(--ink-strong);
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 14px;
      letter-spacing: -0.3px;
    }
    .section-head p {
      font-size: 16px;
      color: var(--ink-soft);
    }
    /* ---------- about / platform intro ---------- */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }
    .about-text {
      font-size: 16px;
      color: var(--ink-body);
      margin-bottom: 18px;
    }
    .about-feature-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 26px;
    }
    .about-feature {
      display: flex;
      gap: 12px;
      align-items: flex-start;
    }
    .about-feature .icon {
      width: 36px; height: 36px;
      border-radius: 10px;
      background: var(--primary-soft);
      display: flex; align-items: center; justify-content: center;
      flex-shrink: 0;
      color: var(--primary);
    }
    .about-feature h4 {
      font-size: 15px;
      color: var(--ink-strong);
      margin-bottom: 2px;
      font-weight: 700;
    }
    .about-feature p {
      font-size: 13px;
      color: var(--ink-soft);
    }
    .intro-panel {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-light);
    }
    .intro-panel h3 {
      font-size: 18px;
      color: var(--ink-strong);
      margin-bottom: 18px;
    }
    .intro-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .intro-list li {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      font-size: 15px;
      color: var(--ink-body);
    }
    .intro-list .check {
      color: var(--success);
      font-weight: 800;
      flex-shrink: 0;
      margin-top: 2px;
    }
    /* ---------- service cards ---------- */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--gap);
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 28px 26px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #cfe0ff;
    }
    .service-card .icon-wrap {
      width: 48px; height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, var(--primary-soft), #f0f5ff);
      display: flex; align-items: center; justify-content: center;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .service-card h3 {
      font-size: 17px;
      color: var(--ink-strong);
      font-weight: 700;
    }
    .service-card p {
      font-size: 14px;
      color: var(--ink-soft);
      flex: 1;
    }
    .service-card .tag-row {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 6px;
    }
    .service-card .tag-row span {
      font-size: 12px;
      padding: 3px 10px;
      border-radius: 100px;
      background: var(--bg-soft);
      color: var(--ink-soft);
    }
    /* ---------- process timeline ---------- */
    .process-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: var(--gap);
      position: relative;
    }
    .process-step {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 26px 22px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
      position: relative;
    }
    .process-step:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
    .process-step .step-num {
      font-size: 13px;
      font-weight: 800;
      color: var(--primary);
      background: var(--primary-soft);
      display: inline-block;
      padding: 3px 12px;
      border-radius: 100px;
      margin-bottom: 14px;
    }
    .process-step h3 {
      font-size: 16px;
      color: var(--ink-strong);
      margin-bottom: 8px;
      font-weight: 700;
    }
    .process-step p { font-size: 13px; color: var(--ink-soft); }
    /* ---------- comparison table ---------- */
    .compare-wrap {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 720px;
    }
    .compare-table thead th {
      background: var(--bg-soft);
      color: var(--ink-strong);
      font-size: 15px;
      font-weight: 700;
      text-align: left;
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-light);
    }
    .compare-table tbody td {
      padding: 16px 24px;
      font-size: 14px;
      color: var(--ink-body);
      border-bottom: 1px solid var(--border-light);
      vertical-align: top;
    }
    .compare-table tbody tr:last-child td { border-bottom: none; }
    .compare-table tbody tr:hover { background: #fafcff; }
    .compare-highlight {
      color: var(--primary);
      font-weight: 700;
    }
    .rating-block {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding: 24px 28px;
      background: linear-gradient(135deg, #f3f7ff, #fff8f4);
      border-top: 1px solid var(--border-light);
    }
    .rating-stars {
      display: flex; align-items: center; gap: 8px;
    }
    .stars { color: #ffb020; font-size: 22px; letter-spacing: 2px; }
    .rating-score { font-size: 28px; font-weight: 800; color: var(--ink-strong); }
    .rating-score small { font-size: 14px; color: var(--ink-soft); font-weight: 500; }
    .compare-scroll { overflow-x: auto; }
    /* ---------- token price ---------- */
    .token-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--gap);
    }
    .token-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 28px 26px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      display: flex; flex-direction: column; gap: 10px;
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .token-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
    .token-card h3 { font-size: 17px; color: var(--ink-strong); font-weight: 700; }
    .token-card .price-line {
      display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap;
      font-size: 14px; color: var(--ink-soft);
    }
    .token-card .price-line strong { color: var(--success); font-size: 22px; font-weight: 800; }
    .token-card .price-line del { color: #9aa8b8; }
    .token-card p { font-size: 13px; color: var(--ink-soft); }
    .token-card .badge {
      align-self: flex-start;
      font-size: 12px;
      background: var(--accent-soft);
      color: #d9622b;
      padding: 3px 10px;
      border-radius: 100px;
      font-weight: 600;
    }
    /* ---------- case showcase ---------- */
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: var(--gap);
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
      display: flex; flex-direction: column;
    }
    .case-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
    .case-media {
      background: var(--bg-soft);
      aspect-ratio: 16 / 9;
      display: flex; align-items: center; justify-content: center;
      overflow: hidden;
    }
    .case-media img { width: 100%; height: 100%; object-fit: cover; }
    .case-body { padding: 22px 24px; }
    .case-body h3 { font-size: 17px; color: var(--ink-strong); margin-bottom: 8px; font-weight: 700; }
    .case-body p { font-size: 14px; color: var(--ink-soft); }
    /* ---------- reviews ---------- */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--gap);
    }
    .review-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 26px 24px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      display: flex; flex-direction: column; gap: 14px;
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
    .review-stars { color: #ffb020; font-size: 16px; letter-spacing: 2px; }
    .review-text { font-size: 14px; color: var(--ink-body); line-height: 1.7; flex: 1; }
    .review-author {
      display: flex; align-items: center; gap: 10px;
      border-top: 1px solid var(--border-light);
      padding-top: 14px;
    }
    .avatar {
      width: 38px; height: 38px; border-radius: 50%;
      background: var(--primary-soft);
      color: var(--primary);
      font-weight: 700;
      display: flex; align-items: center; justify-content: center;
      font-size: 15px;
    }
    .review-author strong { display: block; font-size: 14px; color: var(--ink-strong); }
    .review-author span { font-size: 12px; color: var(--ink-soft); }
    /* ---------- articles ---------- */
    .article-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--gap);
    }
    .article-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 26px 24px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
      display: flex; flex-direction: column; gap: 10px;
    }
    .article-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
    .article-card .date { font-size: 12px; color: var(--ink-soft); }
    .article-card h3 { font-size: 16px; color: var(--ink-strong); font-weight: 700; }
    .article-card p { font-size: 13px; color: var(--ink-soft); flex: 1; }
    .article-card .read-more { font-size: 13px; color: var(--primary); font-weight: 600; }
    /* ---------- contact form ---------- */
    .contact-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }
    .contact-info h2 { font-size: 28px; color: var(--ink-strong); margin-bottom: 14px; font-weight: 800; }
    .contact-info p { font-size: 15px; color: var(--ink-soft); margin-bottom: 24px; }
    .contact-channels {
      display: flex; flex-direction: column; gap: 16px;
    }
    .contact-channel {
      display: flex; gap: 12px; align-items: flex-start;
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      padding: 16px 18px;
      border: 1px solid var(--border-light);
    }
    .contact-channel .icon {
      width: 34px; height: 34px; border-radius: 8px;
      background: var(--primary-soft);
      flex-shrink: 0;
      display: flex; align-items: center; justify-content: center;
      color: var(--primary);
    }
    .contact-channel h4 { font-size: 14px; color: var(--ink-strong); margin-bottom: 2px; font-weight: 700; }
    .contact-channel p { font-size: 13px; color: var(--ink-soft); margin: 0; }
    .contact-form {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
    }
    .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
    .form-field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
    .form-field label { font-size: 13px; font-weight: 600; color: var(--ink-strong); }
    .form-field input,
    .form-field select,
    .form-field textarea {
      width: 100%;
      padding: 11px 14px;
      border-radius: 10px;
      border: 1.5px solid var(--border-light);
      background: var(--bg-base);
      font-size: 14px;
      color: var(--ink-body);
      font-family: inherit;
      transition: border-color 0.2s, background 0.2s;
      outline: none;
    }
    .form-field input:focus,
    .form-field select:focus,
    .form-field textarea:focus {
      border-color: var(--primary);
      background: #fff;
      box-shadow: 0 0 0 3px rgba(24,96,242,0.08);
    }
    .form-field textarea { resize: vertical; min-height: 96px; }
    .form-submit {
      width: 100%;
      padding: 14px;
      border-radius: 100px;
      background: var(--primary);
      color: #fff;
      font-size: 16px;
      font-weight: 700;
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
      margin-top: 4px;
    }
    .form-submit:hover { background: var(--primary-dark); transform: translateY(-1px); }
    .form-submit:active { transform: translateY(0); }
    /* ---------- footer ---------- */
    .site-footer {
      background: #0d1b2a;
      color: #c9d6e4;
      padding: 52px 0 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
      gap: 36px;
      padding-bottom: 40px;
    }
    .footer-brand .brand-name { color: #fff; margin-bottom: 12px; }
    .footer-brand p { font-size: 14px; color: #a8b9cc; line-height: 1.7; margin-bottom: 16px; }
    .footer-brand .footer-contact { font-size: 13px; color: #a8b9cc; }
    .footer-brand .footer-contact a { color: #7cb0ff; }
    .footer-col h4 {
      color: #fff;
      font-size: 15px;
      margin-bottom: 16px;
      font-weight: 700;
    }
    .footer-col ul { display: flex; flex-direction: column; gap: 10px; }
    .footer-col a { font-size: 13px; color: #a8b9cc; transition: color 0.2s; }
    .footer-col a:hover { color: #fff; }
    .footer-qr {
      background: #fff;
      border-radius: 10px;
      padding: 8px;
      width: 100px;
      text-align: center;
    }
    .footer-qr img { width: 84px; height: 84px; object-fit: contain; margin: 0 auto; }
    .footer-qr span { display: block; font-size: 11px; color: #0d1b2a; margin-top: 4px; }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
      font-size: 13px;
      color: #8a9cb0;
    }
    .footer-links {
      display: flex; flex-wrap: wrap; gap: 16px;
    }
    .footer-links a { color: #8a9cb0; font-size: 13px; }
    .footer-links a:hover { color: #fff; }
    /* ---------- float ---------- */
    .float-widget {
      position: fixed;
      right: 18px;
      bottom: 90px;
      z-index: 90;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .float-btn {
      width: 50px; height: 50px;
      border-radius: 50%;
      background: #fff;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
      display: flex; align-items: center; justify-content: center;
      cursor: pointer;
      color: var(--ink-strong);
      transition: transform 0.2s, background 0.2s, color 0.2s;
      position: relative;
    }
    .float-btn:hover { transform: translateY(-2px); background: var(--primary); color: #fff; }
    .float-btn svg { width: 22px; height: 22px; }
    .float-qr-pop {
      position: absolute;
      right: 60px;
      bottom: 0;
      width: 150px;
      background: #fff;
      border-radius: 12px;
      padding: 10px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-light);
      display: none;
    }
    .float-qr-pop img { width: 100%; height: auto; border-radius: 6px; }
    .float-qr-pop.show { display: block; }
    .back-top {
      position: fixed;
      right: 18px;
      bottom: 24px;
      z-index: 90;
      width: 50px; height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      border: none;
      box-shadow: 0 6px 20px rgba(24,96,242,0.3);
      display: flex; align-items: center; justify-content: center;
      cursor: pointer;
      opacity: 0; pointer-events: none;
      transition: opacity 0.25s, transform 0.25s;
    }
    .back-top.visible { opacity: 1; pointer-events: auto; }
    .back-top:hover { transform: translateY(-3px); }
    /* ---------- animations ---------- */
    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(22px); }
      to { opacity: 1; transform: translateY(0); }
    }
    .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.6s ease, transform 0.6s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    /* ---------- responsive ---------- */
    @media (max-width: 1024px) {
      .hero-inner { grid-template-columns: 1fr; gap: 40px; }
      .hero-card { max-width: 560px; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .process-grid { grid-template-columns: repeat(2, 1fr); }
      .review-grid { grid-template-columns: repeat(2, 1fr); }
      .article-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 860px) {
      .nav-links, .header-cta { display: none; }
      .menu-toggle { display: flex; }
      .about-grid { grid-template-columns: 1fr; }
      .contact-wrap { grid-template-columns: 1fr; }
      .case-grid { grid-template-columns: 1fr; }
      .token-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 640px) {
      .container { padding-left: 18px; padding-right: 18px; }
      .hero { padding: 56px 0 48px; }
      .section { padding: 56px 0; }
      .service-grid { grid-template-columns: 1fr; }
      .process-grid { grid-template-columns: 1fr; }
      .review-grid { grid-template-columns: 1fr; }
      .article-grid { grid-template-columns: 1fr; }
      .form-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; gap: 28px; }
      .hero-metrics { gap: 20px; }
      .hero-actions { flex-direction: column; align-items: stretch; }
      .hero-actions .btn-primary, .hero-actions .btn-ghost { width: 100%; }
      .footer-bottom { flex-direction: column; align-items: flex-start; }
      .float-widget { right: 12px; bottom: 82px; }
      .back-top { right: 12px; bottom: 22px; }
      .compare-table { min-width: 640px; }
    }

/* FAQ styles scoped */
    .faq-list { display: flex; flex-direction: column; gap: 12px; }
    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: box-shadow 0.2s, border-color 0.2s;
    }
    .faq-item:hover { border-color: #cfe0ff; }
    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 18px 22px;
      background: transparent;
      border: none;
      cursor: pointer;
      font-size: 15px;
      font-weight: 600;
      color: var(--ink-strong);
      text-align: left;
      font-family: inherit;
      transition: background 0.2s;
    }
    .faq-question:hover { background: #fafcff; }
    .faq-icon {
      flex-shrink: 0;
      width: 24px; height: 24px;
      border-radius: 50%;
      background: var(--bg-soft);
      color: var(--primary);
      display: flex; align-items: center; justify-content: center;
      font-size: 16px;
      font-weight: 700;
      transition: transform 0.25s, background 0.2s;
    }
    .faq-item.active .faq-icon { transform: rotate(45deg); background: var(--primary-soft); }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s ease;
      padding: 0 22px;
    }
    .faq-item.active .faq-answer { max-height: 320px; padding: 0 22px 20px; }
    .faq-answer p { font-size: 14px; color: var(--ink-soft); line-height: 1.7; }
    @media (max-width: 640px) {
      .faq-question { padding: 15px 16px; font-size: 14px; }
      .faq-item.active .faq-answer { padding: 0 16px 16px; }
    }