* { margin: 0; padding: 0; box-sizing: border-box; }
    :root {
      --purple: #7c3aed;
      --purple-dark: #5b21b6;
      --purple-light: #a78bfa;
      --violet-bg: #f5f3ff;
      --lilac: #ede9fe;
      --ink: #1e1b2e;
      --ink-soft: #4b4665;
      --line: #e5e1f0;
      --white: #ffffff;
      --gold: #f59e0b;
      --radius: 16px;
      --shadow-sm: 0 4px 16px rgba(124, 58, 237, 0.08);
      --shadow-md: 0 12px 32px rgba(124, 58, 237, 0.14);
      --shadow-lg: 0 24px 56px rgba(91, 33, 182, 0.18);
      --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font);
      color: var(--ink);
      background: var(--white);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; }
    ul { list-style: none; }
    section { scroll-margin-top: 80px; }
    .container { width: min(1200px, 92%); margin: 0 auto; }

    /* ---------- header ---------- */
    .site-header {
      position: sticky; top: 0; z-index: 100;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--line);
    }
    .header-inner {
      display: flex; align-items: center; justify-content: space-between;
      height: 68px;
    }
    .logo-wrap { display: flex; align-items: center; gap: 10px; }
    .ai-page-logo { max-width: 132px; height: auto; }
    .logo-text { font-weight: 800; font-size: 1.1rem; color: var(--purple-dark); letter-spacing: .5px; display: none; }
    .nav-links { display: flex; align-items: center; gap: 0; flex-wrap: wrap; }
    .nav-links a {
      font-size: .9rem; font-weight: 500; color: var(--ink-soft);
      padding: 8px 11px; border-radius: 8px; transition: .22s;
      white-space: nowrap;
    }
    .nav-links a:hover { color: var(--purple); background: var(--lilac); }
    .nav-cta {
      background: linear-gradient(135deg, var(--purple), var(--purple-light));
      color: #fff !important; padding: 9px 20px !important; border-radius: 999px !important;
      font-weight: 600 !important; box-shadow: var(--shadow-sm);
      margin-left: 8px;
    }
    .nav-cta:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); background: linear-gradient(135deg, var(--purple-dark), var(--purple)) !important; }
    .menu-toggle {
      display: none; width: 44px; height: 44px; border: 1px solid var(--line);
      background: var(--white); border-radius: 10px; cursor: pointer;
      align-items: center; justify-content: center; flex-direction: column; gap: 5px;
    }
    .menu-toggle span { width: 20px; height: 2px; background: var(--purple-dark); border-radius: 2px; transition: .25s; }

    /* ---------- hero ---------- */
    .hero {
      position: relative; overflow: hidden;
      background:
        radial-gradient(900px 500px at 88% -8%, rgba(167,139,250,0.4), transparent 62%),
        radial-gradient(700px 420px at -6% 108%, rgba(124,58,237,0.22), transparent 60%),
        linear-gradient(150deg, #faf8ff 0%, #f2ecff 46%, #ede7ff 100%);
      padding: 92px 0 88px;
    }
    .hero::before, .hero::after {
      content: ""; position: absolute; border-radius: 50%; filter: blur(2px);
      pointer-events: none; opacity: .55;
    }
    .hero::before { width: 360px; height: 360px; right: 4%; top: 8%;
      background: radial-gradient(circle at 30% 30%, rgba(167,139,250,.55), transparent 68%); }
    .hero::after { width: 260px; height: 260px; left: 2%; bottom: -6%;
      background: radial-gradient(circle at 70% 70%, rgba(196,181,253,.5), transparent 70%); }
    .hero-grid-dots {
      position: absolute; inset: 0; pointer-events: none; opacity: .4;
      background-image: radial-gradient(rgba(124,58,237,.16) 1px, transparent 1px);
      background-size: 26px 26px;
      mask-image: radial-gradient(ellipse at center, #000 0%, transparent 78%);
    }
    .hero-content { position: relative; z-index: 2; max-width: 880px; }
    .hero-badge {
      display: inline-flex; align-items: center; gap: 8px;
      background: rgba(124,58,237,0.1); border: 1px solid rgba(124,58,237,0.24);
      color: var(--purple-dark); font-size: .82rem; font-weight: 600;
      padding: 7px 16px; border-radius: 999px; margin-bottom: 26px;
    }
    .hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--purple); box-shadow: 0 0 0 4px rgba(124,58,237,.18); }
    .hero h1 {
      font-size: clamp(2.1rem, 5vw, 3.5rem); line-height: 1.18;
      font-weight: 800; letter-spacing: -.5px; color: var(--ink);
      margin-bottom: 22px;
    }
    .hero h1 .grad {
      background: linear-gradient(120deg, var(--purple-dark), #a855f7 52%, #c084fc);
      -webkit-background-clip: text; background-clip: text; color: transparent;
    }
    .hero-sub {
      font-size: clamp(1rem, 1.7vw, 1.15rem); color: var(--ink-soft);
      max-width: 660px; margin-bottom: 34px;
    }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 44px; }
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 9px;
      font-size: .98rem; font-weight: 700; padding: 15px 34px; border-radius: 999px;
      border: none; cursor: pointer; transition: .26s cubic-bezier(.2,.7,.3,1);
      font-family: var(--font);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--purple-dark), var(--purple) 46%, #a855f7);
      color: #fff; box-shadow: 0 14px 30px rgba(124,58,237,.34);
    }
    .btn-primary:hover { transform: translateY(-3px) scale(1.015); box-shadow: 0 20px 40px rgba(124,58,237,.42); }
    .btn-primary:active { transform: translateY(0) scale(.99); }
    .btn-ghost {
      background: #fff; color: var(--purple-dark);
      border: 1.5px solid rgba(124,58,237,.35); box-shadow: var(--shadow-sm);
    }
    .btn-ghost:hover { border-color: var(--purple); background: var(--lilac); transform: translateY(-3px); }
    .hero-stats {
      display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
      max-width: 820px;
    }
    .hero-stat {
      background: rgba(255,255,255,.74); border: 1px solid rgba(124,58,237,.16);
      border-radius: 14px; padding: 18px 20px; backdrop-filter: blur(6px);
      transition: .28s;
    }
    .hero-stat:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(124,58,237,.34); }
    .hero-stat strong { display: block; font-size: 1.65rem; font-weight: 800; color: var(--purple-dark); line-height: 1.2; }
    .hero-stat span { font-size: .82rem; color: var(--ink-soft); }

    /* ---------- generic section ---------- */
    .section { padding: 84px 0; }
    .section.alt { background: linear-gradient(180deg, #fbfaff, #f5f2ff); }
    .section-head { max-width: 720px; margin-bottom: 46px; }
    .section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
    .eyebrow {
      display: inline-block; font-size: .8rem; font-weight: 700; letter-spacing: 2px;
      color: var(--purple); text-transform: uppercase; margin-bottom: 12px;
    }
    .section-head h2 {
      font-size: clamp(1.6rem, 3vw, 2.3rem); font-weight: 800; line-height: 1.3;
      color: var(--ink); letter-spacing: -.3px; margin-bottom: 14px;
    }
    .section-head p { color: var(--ink-soft); font-size: 1rem; }

    /* reveal animation */
    .reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.3,1); }
    .reveal.visible { opacity: 1; transform: none; }

    /* ---------- data cards / stats strip ---------- */
    .stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
    .stat-card {
      background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
      padding: 30px 24px; text-align: center; transition: .28s;
      position: relative; overflow: hidden;
    }
    .stat-card::after {
      content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 3px;
      background: linear-gradient(90deg, var(--purple), var(--purple-light));
      transform: scaleX(0); transform-origin: left; transition: transform .35s;
    }
    .stat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(124,58,237,.28); }
    .stat-card:hover::after { transform: scaleX(1); }
    .stat-card .num { font-size: 2.2rem; font-weight: 800; color: var(--purple-dark); }
    .stat-card .label { color: var(--ink-soft); font-size: .9rem; margin-top: 6px; }

    /* ---------- about ---------- */
    .about-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 46px; align-items: center; }
    .about-copy p { color: var(--ink-soft); margin-bottom: 16px; font-size: 1rem; }
    .about-points { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 24px; }
    .about-points li {
      display: flex; align-items: flex-start; gap: 9px; font-size: .92rem; color: var(--ink);
      font-weight: 500;
    }
    .about-points li::before {
      content: "✓"; flex: none; width: 20px; height: 20px; border-radius: 50%;
      background: var(--lilac); color: var(--purple-dark); font-size: .72rem; font-weight: 800;
      display: inline-flex; align-items: center; justify-content: center; margin-top: 2px;
    }
    .about-visual {
      background: linear-gradient(150deg, #ede9fe, #f5f3ff);
      border: 1px solid var(--line); border-radius: 22px; padding: 30px;
      box-shadow: var(--shadow-sm);
    }
    .about-visual .tag-cloud { display: flex; flex-wrap: wrap; gap: 9px; }
    .tag-chip {
      background: #fff; border: 1px solid var(--line); border-radius: 999px;
      padding: 7px 14px; font-size: .8rem; font-weight: 600; color: var(--purple-dark);
      transition: .22s;
    }
    .tag-chip:hover { background: var(--purple); color: #fff; transform: translateY(-2px); border-color: var(--purple); }

    /* ---------- service cards ---------- */
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .service-card {
      background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
      padding: 28px 26px; transition: .3s; position: relative; overflow: hidden;
    }
    .service-card::before {
      content: ""; position: absolute; inset: 0;
      background: linear-gradient(140deg, rgba(124,58,237,.05), transparent 55%);
      opacity: 0; transition: .3s;
    }
    .service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(124,58,237,.3); }
    .service-card:hover::before { opacity: 1; }
    .service-icon {
      width: 48px; height: 48px; border-radius: 13px;
      background: linear-gradient(140deg, var(--lilac), #ddd6fe);
      display: flex; align-items: center; justify-content: center;
      color: var(--purple-dark); font-weight: 800; font-size: 1.05rem;
      margin-bottom: 18px; position: relative; z-index: 1;
    }
    .service-card h3 { font-size: 1.08rem; font-weight: 700; margin-bottom: 9px; position: relative; z-index: 1; }
    .service-card p { font-size: .9rem; color: var(--ink-soft); position: relative; z-index: 1; }

    /* ---------- models ---------- */
    .model-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; }
    .model-pill {
      background: #fff; border: 1px solid var(--line); border-radius: 12px;
      padding: 14px 8px; text-align: center; font-size: .84rem; font-weight: 600;
      color: var(--ink-soft); transition: .22s;
    }
    .model-pill:hover { color: var(--purple-dark); border-color: var(--purple-light); background: var(--lilac); transform: translateY(-3px); }

    /* ---------- workflow / steps ---------- */
    .steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; counter-reset: step; }
    .step {
      background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
      padding: 30px 20px 24px; position: relative; transition: .28s;
    }
    .step:hover { transform: translateY(-5px); box-shadow: var(--shadow-sm); border-color: rgba(124,58,237,.3); }
    .step::before {
      counter-increment: step; content: counter(step, decimal-leading-zero);
      position: absolute; top: 14px; right: 18px; font-size: 1.6rem; font-weight: 800;
      color: rgba(124,58,237,.13); line-height: 1;
    }
    .step h4 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
    .step p { font-size: .85rem; color: var(--ink-soft); }

    /* ---------- industry ---------- */
    .industry-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
    .industry-item {
      border: 1px solid var(--line); border-radius: var(--radius); padding: 24px;
      background: #fff; transition: .26s;
    }
    .industry-item:hover { box-shadow: var(--shadow-sm); transform: translateY(-4px); border-color: rgba(124,58,237,.26); }
    .industry-item h4 { font-size: 1rem; margin-bottom: 7px; font-weight: 700; }
    .industry-item p { font-size: .86rem; color: var(--ink-soft); }

    /* ---------- network ---------- */
    .network-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .network-card {
      background: linear-gradient(150deg, #ffffff, #faf8ff);
      border: 1px solid var(--line); border-radius: var(--radius); padding: 26px;
      display: flex; flex-direction: column; gap: 8px;
    }
    .network-card strong { color: var(--purple-dark); font-size: 1.02rem; }
    .network-card span { color: var(--ink-soft); font-size: .9rem; }

    /* ---------- compare table ---------- */
    .compare-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--line); background: #fff; }
    table.compare {
      width: 100%; border-collapse: collapse; min-width: 760px; font-size: .92rem;
    }
    table.compare th, table.compare td { padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--line); }
    table.compare thead th {
      background: linear-gradient(135deg, #f5f1ff, #ede6ff); color: var(--purple-dark);
      font-weight: 700; white-space: nowrap;
    }
    table.compare thead th.highlight { background: linear-gradient(135deg, var(--purple), #a855f7); color: #fff; }
    table.compare tbody tr:hover { background: #faf8ff; }
    table.compare td.highlight { color: var(--purple-dark); font-weight: 600; background: rgba(237,233,254,.4); }
    .star-badge { color: var(--gold); letter-spacing: 2px; font-size: 1rem; }
    .score-badge {
      display: inline-flex; align-items: baseline; gap: 3px;
      background: linear-gradient(135deg, var(--purple-dark), #a855f7);
      color: #fff; padding: 4px 12px; border-radius: 999px; font-weight: 800; font-size: .9rem;
    }
    .score-badge small { font-weight: 500; opacity: .8; font-size: .75rem; }

    /* ---------- reviews ---------- */
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
    .review-card {
      background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
      padding: 28px; transition: .28s; display: flex; flex-direction: column;
    }
    .review-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: rgba(124,58,237,.26); }
    .review-stars { color: var(--gold); font-size: .95rem; letter-spacing: 2px; margin-bottom: 14px; }
    .review-text { font-size: .93rem; color: var(--ink-soft); flex: 1; margin-bottom: 20px; }
    .review-user { display: flex; align-items: center; gap: 12px; }
    .avatar {
      width: 42px; height: 42px; border-radius: 50%;
      background: linear-gradient(140deg, var(--purple), var(--purple-light));
      color: #fff; display: flex; align-items: center; justify-content: center;
      font-weight: 700; font-size: .95rem; flex: none;
    }
    .review-user strong { display: block; font-size: .9rem; }
    .review-user span { font-size: .78rem; color: var(--ink-soft); }

    /* ---------- case & gallery ---------- */
    .media-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-bottom: 28px; }
    .media-card {
      border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line);
      background: #fff; transition: .3s;
    }
    .media-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
    .media-card img { width: 100%; height: 230px; object-fit: cover; }
    .media-card .cap { padding: 16px 20px; font-size: .9rem; font-weight: 600; color: var(--ink); }
    .poster-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .poster-item { border-radius: 14px; overflow: hidden; border: 1px solid var(--line); background: #fff; }
    .poster-item img { width: 100%; height: 160px; object-fit: cover; }
    .poster-item.portrait img { height: 260px; object-fit: cover; }

    /* ---------- form ---------- */
    .form-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
    .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .field label { display: block; font-size: .84rem; font-weight: 600; margin-bottom: 7px; color: var(--ink); }
    .field input, .field select, .field textarea {
      width: 100%; padding: 13px 16px; border: 1.5px solid var(--line);
      border-radius: 11px; font-size: .93rem; font-family: var(--font);
      background: #fff; transition: .22s; color: var(--ink);
    }
    .field input:focus, .field select:focus, .field textarea:focus {
      outline: none; border-color: var(--purple); box-shadow: 0 0 0 4px rgba(124,58,237,.12);
    }
    .field textarea { min-height: 112px; resize: vertical; }
    .form-note { font-size: .8rem; color: var(--ink-soft); }
    .contact-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 42px; align-items: start; }
    .contact-card {
      background: #fff; border: 1px solid var(--line); border-radius: 18px;
      padding: 30px; box-shadow: var(--shadow-sm);
    }
    .contact-list { display: flex; flex-direction: column; gap: 16px; margin-top: 6px; }
    .contact-item { display: flex; gap: 12px; align-items: flex-start; font-size: .92rem; color: var(--ink-soft); }
    .contact-item .ck {
      flex: none; width: 36px; height: 36px; border-radius: 10px;
      background: var(--lilac); color: var(--purple-dark); display: flex;
      align-items: center; justify-content: center; font-weight: 800; font-size: .8rem;
    }
    .contact-item strong { color: var(--ink); display: block; font-size: .88rem; }
    .qr-wrap img { width: 150px; border-radius: 12px; border: 1px solid var(--line); padding: 6px; background: #fff; }

    /* ---------- token / price ---------- */
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
    .price-card {
      background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
      padding: 30px; text-align: center; transition: .28s; position: relative;
    }
    .price-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
    .price-card.featured { border: 2px solid var(--purple); box-shadow: var(--shadow-md); }
    .price-card.featured::after {
      content: "推荐"; position: absolute; top: 16px; right: -1px;
      background: linear-gradient(135deg, var(--purple-dark), #a855f7); color: #fff;
      font-size: .72rem; font-weight: 700; padding: 4px 14px; border-radius: 999px 0 0 999px;
    }
    .price-card h4 { font-size: 1.05rem; margin-bottom: 6px; }
    .price-tag { font-size: 2rem; font-weight: 800; color: var(--purple-dark); margin: 10px 0 6px; }
    .price-tag small { font-size: .82rem; font-weight: 500; color: var(--ink-soft); }
    .price-card ul { margin: 18px 0 22px; display: flex; flex-direction: column; gap: 9px; text-align: left; }
    .price-card ul li { font-size: .86rem; color: var(--ink-soft); display: flex; gap: 8px; }
    .price-card ul li::before { content: "·"; color: var(--purple); font-weight: 800; }

    /* ---------- articles ---------- */
    .article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .article-card {
      background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
      padding: 24px; transition: .26s; display: flex; flex-direction: column;
    }
    .article-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-sm); border-color: rgba(124,58,237,.28); }
    .article-card h4 { font-size: .98rem; margin-bottom: 8px; line-height: 1.5; }
    .article-card p { font-size: .86rem; color: var(--ink-soft); flex: 1; margin-bottom: 14px; }
    .article-card a { color: var(--purple-dark); font-weight: 600; font-size: .86rem; }
    .article-card a:hover { text-decoration: underline; }

    /* ---------- faq ---------- */
    .faq-list { display: flex; flex-direction: column; gap: 12px; max-width: 880px; margin: 0 auto; }
    .faq-item {
      background: #fff; border: 1px solid var(--line); border-radius: 14px;
      overflow: hidden; transition: .22s;
    }
    .faq-item:hover { border-color: rgba(124,58,237,.3); }
    .faq-q {
      width: 100%; text-align: left; background: none; border: none; cursor: pointer;
      padding: 19px 22px; font-size: .97rem; font-weight: 600; color: var(--ink);
      display: flex; justify-content: space-between; align-items: center; gap: 14px;
      font-family: var(--font); transition: .2s;
    }
    .faq-q:hover { color: var(--purple-dark); }
    .faq-q .plus {
      flex: none; width: 26px; height: 26px; border-radius: 50%;
      background: var(--lilac); color: var(--purple-dark); font-size: 1rem;
      display: flex; align-items: center; justify-content: center; transition: .25s;
    }
    .faq-item.open .faq-q .plus { transform: rotate(45deg); background: var(--purple); color: #fff; }
    .faq-a {
      max-height: 0; overflow: hidden; transition: max-height .35s ease, padding .3s ease;
      padding: 0 22px;
    }
    .faq-item.open .faq-a { max-height: 320px; padding: 0 22px 20px; }
    .faq-a p { font-size: .9rem; color: var(--ink-soft); }

    /* ---------- footer ---------- */
    .site-footer { background: #150f28; color: #c9c1e0; padding: 66px 0 30px; }
    .footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 40px; }
    .footer-brand .ai-page-logo { margin-bottom: 16px;  max-width: 140px; }
    .footer-brand p { font-size: .88rem; line-height: 1.75; color: #a99fd0; }
    .footer-col h5 { color: #fff; font-size: .95rem; margin-bottom: 16px; font-weight: 700; }
    .footer-col ul { display: flex; flex-direction: column; gap: 10px; }
    .footer-col a, .footer-col span { font-size: .86rem; color: #a99fd0; transition: .2s; }
    .footer-col a:hover { color: #d8c8ff; }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,.09); padding-top: 24px;
      display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px;
      font-size: .82rem; color: #8c82b8;
    }
    .flinks { display: flex; flex-wrap: wrap; gap: 16px; }
    .flinks a { color: #a99fd0; }
    .flinks a:hover { color: #d8c8ff; }

    /* ---------- floating ---------- */
    .float-actions {
      position: fixed; right: 20px; bottom: 26px; z-index: 90;
      display: flex; flex-direction: column; gap: 12px;
    }
    .float-btn {
      width: 52px; height: 52px; border-radius: 50%; border: none; cursor: pointer;
      background: linear-gradient(140deg, var(--purple-dark), #a855f7);
      color: #fff; font-size: .72rem; font-weight: 700;
      display: flex; align-items: center; justify-content: center; text-align: center;
      box-shadow: 0 10px 26px rgba(124,58,237,.4); transition: .26s;
      font-family: var(--font); line-height: 1.1;
    }
    .float-btn:hover { transform: translateY(-4px) scale(1.06); }
    .float-btn.backtop { background: #fff; color: var(--purple-dark); border: 1.5px solid var(--line); font-size: 1rem; }
    .float-btn.backtop:hover { background: var(--lilac); }
    .kefu-pop {
      position: fixed; right: 84px; bottom: 26px; z-index: 95;
      background: #fff; border: 1px solid var(--line); border-radius: 16px;
      padding: 18px; box-shadow: var(--shadow-lg); display: none; text-align: center;
    }
    .kefu-pop.show { display: block; animation: pop .28s ease; }
    @keyframes pop { from { opacity: 0; transform: translateY(12px) scale(.96); } to { opacity: 1; transform: none; } }
    .kefu-pop img { width: 156px; border-radius: 10px; margin-bottom: 10px; }
    .kefu-pop p { font-size: .8rem; color: var(--ink-soft); }

    /* ---------- responsive ---------- */
    @media (max-width: 1024px) {
      .hero-stats { grid-template-columns: repeat(2, 1fr); }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .model-grid { grid-template-columns: repeat(4, 1fr); }
      .steps { grid-template-columns: repeat(3, 1fr); }
      .industry-grid { grid-template-columns: repeat(2, 1fr); }
      .review-grid { grid-template-columns: repeat(2, 1fr); }
      .about-grid { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
      .stat-grid { grid-template-columns: repeat(2, 1fr); }
      .poster-strip { grid-template-columns: repeat(2, 1fr); }
      .price-grid { grid-template-columns: 1fr; }
      .article-grid { grid-template-columns: repeat(2, 1fr); }
      .network-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 860px) {
      .nav-links {
        position: fixed; top: 68px; left: 0; right: 0;
        background: #fff; flex-direction: column; align-items: stretch;
        padding: 12px 5%; gap: 4px; border-bottom: 1px solid var(--line);
        box-shadow: var(--shadow-md); transform: translateY(-140%);
        transition: transform .32s ease; max-height: calc(100vh - 68px); overflow-y: auto;
      }
      .nav-links.open { transform: translateY(0); }
      .nav-links a { padding: 13px 16px; font-size: .95rem; }
      .nav-cta { margin: 8px 0 0 !important; text-align: center; }
      .menu-toggle { display: flex; }
      .hero { padding: 64px 0 66px; }
      .section { padding: 62px 0; }
      .steps { grid-template-columns: repeat(2, 1fr); }
      .media-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 640px) {
      .hero-stats { grid-template-columns: 1fr 1fr; gap: 12px; }
      .hero-stat { padding: 14px; }
      .hero-stat strong { font-size: 1.35rem; }
      .service-grid { grid-template-columns: 1fr; }
      .model-grid { grid-template-columns: repeat(2, 1fr); }
      .steps { grid-template-columns: 1fr; }
      .industry-grid { grid-template-columns: 1fr; }
      .review-grid { grid-template-columns: 1fr; }
      .article-grid { grid-template-columns: 1fr; }
      .network-grid { grid-template-columns: 1fr; }
      .form-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; gap: 26px; }
      .about-points { grid-template-columns: 1fr; }
      .stat-grid { grid-template-columns: 1fr 1fr; }
      .poster-strip { grid-template-columns: 1fr; }
      .btn { width: 100%; }
      .hero-actions { flex-direction: column; }
      .float-actions { right: 14px; bottom: 18px; }
      .kefu-pop { right: 76px; bottom: 18px; }
      table.compare { font-size: .84rem; }
    }