/* ========== 基础重置 ========== */
    *,
    *::before,
    *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    :root {
      --bg-body: #f7f9fc;
      --bg-soft: #eef3fa;
      --bg-card: #ffffff;
      --primary: #1a4b8c;
      --primary-light: #2d6bc4;
      --primary-soft: #e4eefb;
      --accent: #0d9e8a;
      --accent-soft: #e0f6f3;
      --text-dark: #14213d;
      --text-body: #3a4a63;
      --text-muted: #6b7c93;
      --border-light: #dce4ef;
      --shadow-sm: 0 2px 8px rgba(20, 33, 61, 0.06);
      --shadow-md: 0 8px 24px rgba(20, 33, 61, 0.08);
      --shadow-lg: 0 16px 48px rgba(20, 33, 61, 0.10);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --container-max: 1200px;
      --container-pad: 20px;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font);
      background-color: var(--bg-body);
      background-image:
        radial-gradient(ellipse 80% 50% at 0% 0%, rgba(45, 107, 196, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 100% 20%, rgba(13, 158, 138, 0.05) 0%, transparent 60%);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      color: var(--primary-light);
      text-decoration: none;
    }

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

    ul {
      list-style: none;
    }

    /* ========== 通用容器 ========== */
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding-left: var(--container-pad);
      padding-right: var(--container-pad);
      width: 100%;
    }

    /* ========== 顶部导航 ========== */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: saturate(180%) blur(12px);
      border-bottom: 1px solid var(--border-light);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 68px;
      gap: 16px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .brand .ai-page-logo {
      height: 38px;
      width: auto;
    }

    .brand-name {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-dark);
      letter-spacing: 0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      overflow-x: auto;
      scrollbar-width: none;
    }

    .nav-links::-webkit-scrollbar {
      display: none;
    }

    .nav-links a {
      display: block;
      padding: 8px 14px;
      font-size: 0.92rem;
      color: var(--text-body);
      border-radius: var(--radius-sm);
      white-space: nowrap;
      transition: background 0.2s, color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      background: var(--primary-soft);
      color: var(--primary);
    }

    .nav-cta {
      display: none;
      flex-shrink: 0;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      padding: 10px 22px;
      font-size: 0.94rem;
      font-weight: 600;
      border-radius: 100px;
      border: 2px solid transparent;
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.2s, background 0.2s, color 0.2s;
      white-space: nowrap;
      font-family: inherit;
      line-height: 1.4;
    }

    .btn:active {
      transform: scale(0.97);
    }

    .btn-primary {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    .btn-primary:hover {
      background: var(--primary-light);
      border-color: var(--primary-light);
      color: #ffffff;
      box-shadow: 0 6px 20px rgba(26, 75, 140, 0.28);
    }

    .btn-accent {
      background: var(--accent);
      color: #ffffff;
      border-color: var(--accent);
    }

    .btn-accent:hover {
      background: #0b8a79;
      border-color: #0b8a79;
      color: #ffffff;
      box-shadow: 0 6px 20px rgba(13, 158, 138, 0.32);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary-soft);
      color: var(--primary);
    }

    .btn-sm {
      padding: 7px 16px;
      font-size: 0.85rem;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      justify-content: center;
      gap: 5px;
      width: 40px;
      height: 40px;
      background: var(--bg-soft);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      cursor: pointer;
      padding: 9px;
    }

    .menu-toggle span {
      display: block;
      height: 2px;
      background: var(--text-dark);
      border-radius: 2px;
      transition: transform 0.25s, opacity 0.25s;
    }

    .menu-toggle.open span:nth-child(1) {
      transform: translateY(7px) rotate(45deg);
    }
    .menu-toggle.open span:nth-child(2) {
      opacity: 0;
    }
    .menu-toggle.open span:nth-child(3) {
      transform: translateY(-7px) rotate(-45deg);
    }

    /* ========== 通用区块 ========== */
    .section {
      padding: 64px 0;
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 40px;
    }

    .eyebrow {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 2px;
      text-transform: uppercase;
      color: var(--accent);
      background: var(--accent-soft);
      padding: 4px 14px;
      border-radius: 100px;
      margin-bottom: 14px;
    }

    .section-head h2 {
      font-size: clamp(1.5rem, 3.2vw, 2.1rem);
      color: var(--text-dark);
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 12px;
    }

    .section-head p {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* ========== Hero 首屏（无图片） ========== */
    .hero {
      position: relative;
      overflow: hidden;
      padding: 72px 0 80px;
      background:
        linear-gradient(135deg, rgba(26, 75, 140, 0.94) 0%, rgba(20, 33, 61, 0.96) 55%, rgba(13, 100, 140, 0.92) 100%);
      color: #ffffff;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image:
        radial-gradient(circle at 18% 25%, rgba(90, 170, 255, 0.25) 0, transparent 30%),
        radial-gradient(circle at 82% 70%, rgba(13, 220, 180, 0.18) 0, transparent 32%),
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
      background-size: auto, auto, 44px 44px, 44px 44px;
      pointer-events: none;
    }

    .hero-grid {
      position: relative;
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 0.82rem;
      font-weight: 600;
      letter-spacing: 1px;
      color: #bfe3ff;
      background: rgba(255, 255, 255, 0.10);
      border: 1px solid rgba(255, 255, 255, 0.18);
      padding: 6px 16px;
      border-radius: 100px;
      margin-bottom: 22px;
    }

    .hero-badge::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #3de0c2;
      box-shadow: 0 0 10px #3de0c2;
      animation: pulse-dot 2.2s ease-in-out infinite;
    }

    @keyframes pulse-dot {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(0.8); }
    }

    .hero h1 {
      font-size: clamp(1.8rem, 4vw, 2.9rem);
      font-weight: 900;
      line-height: 1.25;
      letter-spacing: 0.5px;
      margin-bottom: 20px;
      color: #ffffff;
    }

    .hero h1 .hl {
      color: #6be3cf;
    }

    .hero-desc {
      font-size: 1.02rem;
      color: rgba(255, 255, 255, 0.82);
      line-height: 1.8;
      max-width: 540px;
      margin-bottom: 30px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 34px;
    }

    .hero-actions .btn-primary {
      background: #ffffff;
      color: var(--primary);
      border-color: #ffffff;
      font-weight: 700;
    }

    .hero-actions .btn-primary:hover {
      background: #e8f2ff;
      border-color: #e8f2ff;
      box-shadow: 0 8px 28px rgba(255, 255, 255, 0.28);
    }

    .hero-actions .btn-ghost {
      background: rgba(255, 255, 255, 0.08);
      color: #ffffff;
      border-color: rgba(255, 255, 255, 0.35);
    }

    .hero-actions .btn-ghost:hover {
      background: rgba(255, 255, 255, 0.18);
      border-color: rgba(255, 255, 255, 0.6);
      color: #ffffff;
    }

    .hero-metrics {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .hero-metric {
      flex: 1 1 130px;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.14);
      border-radius: var(--radius-md);
      padding: 14px 18px;
      transition: background 0.25s, transform 0.25s;
    }

    .hero-metric:hover {
      background: rgba(255, 255, 255, 0.14);
      transform: translateY(-3px);
    }

    .hero-metric .num {
      font-size: 1.5rem;
      font-weight: 800;
      color: #6be3cf;
      line-height: 1.2;
    }

    .hero-metric .label {
      font-size: 0.8rem;
      color: rgba(255, 255, 255, 0.72);
      margin-top: 2px;
    }

    /* Hero 右侧装饰面板（无图片） */
    .hero-panel {
      position: relative;
    }

    .panel-card {
      background: rgba(255, 255, 255, 0.07);
      border: 1px solid rgba(255, 255, 255, 0.16);
      border-radius: var(--radius-lg);
      padding: 26px 24px;
      backdrop-filter: blur(8px);
    }

    .panel-card h3 {
      font-size: 0.95rem;
      font-weight: 700;
      color: #d6ecff;
      margin-bottom: 18px;
      letter-spacing: 1px;
    }

    .panel-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 9px;
    }

    .panel-tag {
      font-size: 0.78rem;
      color: rgba(255, 255, 255, 0.85);
      background: rgba(255, 255, 255, 0.10);
      border: 1px solid rgba(255, 255, 255, 0.12);
      padding: 5px 13px;
      border-radius: 100px;
      transition: background 0.2s, color 0.2s;
      cursor: default;
    }

    .panel-tag:hover {
      background: rgba(107, 227, 207, 0.22);
      color: #ffffff;
    }

    .panel-note {
      margin-top: 20px;
      padding-top: 18px;
      border-top: 1px dashed rgba(255, 255, 255, 0.18);
      font-size: 0.82rem;
      color: rgba(255, 255, 255, 0.64);
      line-height: 1.7;
    }

    .panel-note strong {
      color: #6be3cf;
    }

    /* ========== 数据指标条 ========== */
    .stats-strip {
      background: var(--bg-card);
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

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

    .stat-item {
      text-align: center;
      padding: 28px 16px;
      border-right: 1px solid var(--border-light);
      transition: background 0.25s;
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-item:hover {
      background: var(--primary-soft);
    }

    .stat-num {
      font-size: clamp(1.5rem, 3vw, 2.1rem);
      font-weight: 900;
      color: var(--primary);
      line-height: 1.2;
    }

    .stat-num span {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--accent);
      margin-left: 2px;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* ========== 关于我们 / 平台介绍 ========== */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .about-visual {
      background: linear-gradient(145deg, var(--primary-soft) 0%, #ffffff 100%);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 36px 32px;
      box-shadow: var(--shadow-md);
    }

    .about-visual h3 {
      font-size: 1.2rem;
      color: var(--text-dark);
      font-weight: 800;
      margin-bottom: 18px;
    }

    .about-visual ul {
      display: grid;
      gap: 14px;
    }

    .about-visual li {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      font-size: 0.94rem;
      color: var(--text-body);
    }

    .about-visual li::before {
      content: "";
      flex-shrink: 0;
      width: 20px;
      height: 20px;
      margin-top: 2px;
      border-radius: 50%;
      background: var(--accent-soft);
      border: 2px solid var(--accent);
      display: inline-block;
    }

    .about-text h2 {
      font-size: clamp(1.4rem, 3vw, 1.9rem);
      color: var(--text-dark);
      font-weight: 800;
      margin-bottom: 16px;
      line-height: 1.35;
    }

    .about-text p {
      margin-bottom: 14px;
      font-size: 0.98rem;
    }

    .about-text .highlight-row {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 22px;
    }

    .chip {
      font-size: 0.82rem;
      font-weight: 600;
      padding: 6px 16px;
      border-radius: 100px;
      background: var(--primary-soft);
      color: var(--primary);
      border: 1px solid rgba(26, 75, 140, 0.14);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .chip:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-sm);
    }

    /* ========== 服务能力卡片 ========== */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 22px;
    }

    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 26px 24px;
      transition: transform 0.28s, box-shadow 0.28s, border-color 0.28s;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(26, 75, 140, 0.22);
    }

    .service-icon {
      width: 46px;
      height: 46px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--primary);
      background: var(--primary-soft);
      flex-shrink: 0;
    }

    .service-card:nth-child(3n+2) .service-icon {
      background: var(--accent-soft);
      color: var(--accent);
    }

    .service-card h3 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    /* ========== 一站式制作 / 流程步骤 ========== */
    .steps-wrap {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      counter-reset: step;
    }

    .step-card {
      position: relative;
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 26px 22px 24px;
      transition: transform 0.25s, box-shadow 0.25s;
      overflow: hidden;
    }

    .step-card::after {
      counter-increment: step;
      content: "0" counter(step);
      position: absolute;
      top: 10px;
      right: 16px;
      font-size: 2.2rem;
      font-weight: 900;
      color: rgba(26, 75, 140, 0.07);
      line-height: 1;
      pointer-events: none;
    }

    .step-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .step-badge {
      display: inline-block;
      font-size: 0.76rem;
      font-weight: 700;
      color: var(--accent);
      background: var(--accent-soft);
      padding: 3px 12px;
      border-radius: 100px;
      margin-bottom: 12px;
    }

    .step-card h3 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 0.87rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* ========== 行业方案 / 标签云 ========== */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 12px;
      max-width: 900px;
      margin: 0 auto;
    }

    .tag-pill {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-body);
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      padding: 9px 20px;
      border-radius: 100px;
      transition: background 0.22s, color 0.22s, transform 0.22s, box-shadow 0.22s;
      cursor: default;
    }

    .tag-pill:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    /* ========== 服务网络 / 时间线 ========== */
    .timeline {
      position: relative;
      max-width: 780px;
      margin: 0 auto;
      padding-left: 32px;
    }

    .timeline::before {
      content: "";
      position: absolute;
      left: 9px;
      top: 8px;
      bottom: 8px;
      width: 2px;
      background: linear-gradient(to bottom, var(--primary-light), var(--accent));
      border-radius: 2px;
    }

    .timeline-item {
      position: relative;
      padding: 0 0 30px 12px;
    }

    .timeline-item:last-child {
      padding-bottom: 0;
    }

    .timeline-item::before {
      content: "";
      position: absolute;
      left: -32px;
      top: 7px;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 4px solid var(--primary-light);
      box-shadow: 0 0 0 4px var(--primary-soft);
    }

    .timeline-item:nth-child(even)::before {
      border-color: var(--accent);
      box-shadow: 0 0 0 4px var(--accent-soft);
    }

    .timeline-item h3 {
      font-size: 1.02rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 4px;
    }

    .timeline-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* ========== 案例中心 ========== */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 22px;
    }

    .case-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: transform 0.28s, box-shadow 0.28s;
      display: flex;
      flex-direction: column;
    }

    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
    }

    .case-thumb {
      aspect-ratio: 16 / 9;
      background: var(--bg-soft);
      overflow: hidden;
    }

    .case-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.45s;
    }

    .case-card:hover .case-thumb img {
      transform: scale(1.05);
    }

    .case-body {
      padding: 20px 22px 24px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      flex-grow: 1;
    }

    .case-tag {
      font-size: 0.74rem;
      font-weight: 700;
      color: var(--accent);
      letter-spacing: 0.5px;
    }

    .case-body h3 {
      font-size: 1.02rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    .case-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* ========== 对比评测 ========== */
    .compare-wrap {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      box-shadow: var(--shadow-md);
      overflow-x: auto;
    }

    .compare-header {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      margin-bottom: 24px;
    }

    .compare-score {
      display: flex;
      align-items: baseline;
      gap: 10px;
    }

    .compare-score .big {
      font-size: 2.6rem;
      font-weight: 900;
      color: var(--accent);
      line-height: 1;
    }

    .compare-score .stars {
      color: #f5a623;
      font-size: 1.1rem;
      letter-spacing: 2px;
    }

    .compare-score .meta {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 640px;
    }

    .compare-table th,
    .compare-table td {
      padding: 13px 16px;
      text-align: left;
      font-size: 0.9rem;
      border-bottom: 1px solid var(--border-light);
      vertical-align: top;
    }

    .compare-table thead th {
      background: var(--primary-soft);
      color: var(--primary);
      font-weight: 700;
      font-size: 0.88rem;
      white-space: nowrap;
    }

    .compare-table thead th:nth-child(2) {
      color: var(--accent);
    }

    .compare-table tbody tr:hover {
      background: rgba(26, 75, 140, 0.03);
    }

    .compare-table td:first-child {
      font-weight: 600;
      color: var(--text-dark);
      white-space: nowrap;
    }

    .check {
      color: var(--accent);
      font-weight: 800;
    }

    .cross {
      color: #b0b8c6;
    }

    /* ========== 需求匹配 / 表单 ========== */
    .form-layout {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 36px;
      align-items: stretch;
    }

    .form-aside {
      background: linear-gradient(150deg, var(--primary) 0%, #1a365d 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px 30px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 18px;
    }

    .form-aside h2 {
      font-size: 1.5rem;
      font-weight: 800;
      line-height: 1.35;
    }

    .form-aside p {
      font-size: 0.93rem;
      color: rgba(255, 255, 255, 0.78);
      line-height: 1.8;
    }

    .form-aside .contact-list {
      display: grid;
      gap: 12px;
      margin-top: 8px;
    }

    .form-aside .contact-list li {
      font-size: 0.9rem;
      color: rgba(255, 255, 255, 0.85);
      display: flex;
      gap: 8px;
      align-items: baseline;
    }

    .form-aside .contact-list li strong {
      color: #6be3cf;
      flex-shrink: 0;
    }

    .form-box {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      box-shadow: var(--shadow-md);
    }

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
      margin-bottom: 16px;
    }

    .form-group label {
      font-size: 0.86rem;
      font-weight: 600;
      color: var(--text-dark);
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      font-family: inherit;
      font-size: 0.92rem;
      color: var(--text-dark);
      background: var(--bg-body);
      border: 1.5px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 11px 14px;
      transition: border-color 0.2s, box-shadow 0.2s;
      width: 100%;
      outline: none;
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--primary-light);
      box-shadow: 0 0 0 3px rgba(45, 107, 196, 0.12);
      background: #ffffff;
    }

    .form-group textarea {
      resize: vertical;
      min-height: 100px;
    }

    .form-submit {
      width: 100%;
      margin-top: 6px;
    }

    /* ========== Token 比价 ========== */
    .price-compare-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 18px;
    }

    .price-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 22px 20px;
      transition: transform 0.25s, box-shadow 0.25s;
    }

    .price-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .price-card .model-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
    }

    .price-card .model-name .badge-low {
      font-size: 0.7rem;
      font-weight: 700;
      color: var(--accent);
      background: var(--accent-soft);
      padding: 2px 9px;
      border-radius: 100px;
      white-space: nowrap;
    }

    .price-row {
      display: flex;
      justify-content: space-between;
      font-size: 0.85rem;
      padding: 5px 0;
      color: var(--text-muted);
    }

    .price-row .val {
      font-weight: 700;
      color: var(--text-dark);
    }

    .price-row .val.accent {
      color: var(--accent);
    }

    /* ========== FAQ 折叠 ========== */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: grid;
      gap: 12px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: box-shadow 0.25s, border-color 0.25s;
    }

    .faq-item:hover {
      border-color: rgba(26, 75, 140, 0.22);
    }

    .faq-item.open {
      box-shadow: var(--shadow-md);
      border-color: rgba(26, 75, 140, 0.25);
    }

    .faq-q {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 18px 22px;
      font-size: 0.96rem;
      font-weight: 600;
      color: var(--text-dark);
      background: none;
      border: none;
      cursor: pointer;
      text-align: left;
      font-family: inherit;
      transition: color 0.2s;
    }

    .faq-q:hover {
      color: var(--primary);
    }

    .faq-q .icon {
      flex-shrink: 0;
      width: 26px;
      height: 26px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--primary-soft);
      color: var(--primary);
      font-size: 1rem;
      font-weight: 700;
      transition: transform 0.3s, background 0.3s;
    }

    .faq-item.open .faq-q .icon {
      transform: rotate(45deg);
      background: var(--accent-soft);
      color: var(--accent);
    }

    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }

    .faq-a-inner {
      padding: 0 22px 20px;
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.8;
    }

    /* ========== 客户评论 ========== */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 22px;
    }

    .review-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 26px 24px;
      display: flex;
      flex-direction: column;
      gap: 14px;
      transition: transform 0.26s, box-shadow 0.26s;
    }

    .review-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .review-stars {
      color: #f5a623;
      font-size: 0.95rem;
      letter-spacing: 2px;
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-body);
      line-height: 1.75;
      flex-grow: 1;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      padding-top: 14px;
      border-top: 1px solid var(--border-light);
    }

    .avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-soft);
      color: var(--primary);
      font-weight: 800;
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    .review-card:nth-child(even) .avatar {
      background: var(--accent-soft);
      color: var(--accent);
    }

    .user-name {
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    .user-role {
      font-size: 0.78rem;
      color: var(--text-muted);
    }

    /* ========== AI百科 / 文章列表 ========== */
    .article-list {
      display: grid;
      gap: 14px;
      max-width: 860px;
      margin: 0 auto;
    }

    .article-item {
      display: flex;
      align-items: flex-start;
      gap: 15px;
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 18px 22px;
      transition: transform 0.22s, box-shadow 0.22s, border-color 0.22s;
    }

    .article-item:hover {
      transform: translateX(4px);
      box-shadow: var(--shadow-sm);
      border-color: rgba(26, 75, 140, 0.2);
    }

    .article-dot {
      flex-shrink: 0;
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: var(--accent);
      margin-top: 8px;
    }

    .article-item:nth-child(even) .article-dot {
      background: var(--primary-light);
    }

    .article-item a {
      font-size: 0.94rem;
      font-weight: 600;
      color: var(--text-dark);
      line-height: 1.6;
    }

    .article-item a:hover {
      color: var(--primary);
    }

    /* ========== 联系我们 / 页脚 ========== */
    .footer {
      background: #10213a;
      color: #c7d4e6;
      padding: 52px 0 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 36px;
      padding-bottom: 36px;
    }

    .footer-brand .ai-page-logo {
      height: 36px;
      width: auto;
      margin-bottom: 14px;
      
      opacity: 0.92;
    }

    .footer-brand p {
      font-size: 0.88rem;
      color: #93a6c0;
      line-height: 1.8;
      margin-bottom: 14px;
    }

    .footer-contact-line {
      font-size: 0.86rem;
      color: #b7c6da;
      margin-bottom: 6px;
    }

    .footer-contact-line strong {
      color: #7fe6d2;
      font-weight: 600;
    }

    .footer h3 {
      font-size: 0.98rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
      letter-spacing: 0.5px;
    }

    .footer-links {
      display: grid;
      gap: 10px;
    }

    .footer-links a {
      font-size: 0.87rem;
      color: #a3b6cf;
      transition: color 0.2s, padding-left 0.2s;
    }

    .footer-links a:hover {
      color: #7fe6d2;
      padding-left: 4px;
    }

    .footer-qr {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-top: 6px;
    }

    .footer-qr img {
      width: 84px;
      height: 84px;
      border-radius: var(--radius-sm);
      border: 2px solid rgba(255, 255, 255, 0.14);
      object-fit: contain;
      background: #ffffff;
    }

    .footer-qr .qr-note {
      font-size: 0.82rem;
      color: #93a6c0;
      line-height: 1.7;
    }

    .footer-qr .qr-note strong {
      color: #7fe6d2;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.09);
      padding: 18px 0;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
      font-size: 0.82rem;
      color: #7d90ab;
    }

    .footer-friend {
      display: flex;
      flex-wrap: wrap;
      gap: 8px 18px;
      padding: 20px 0 18px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

    .footer-friend span {
      font-size: 0.82rem;
      color: #7d90ab;
      flex-shrink: 0;
    }

    .footer-friend a {
      font-size: 0.82rem;
      color: #93a6c0;
      transition: color 0.2s;
    }

    .footer-friend a:hover {
      color: #7fe6d2;
    }

    /* ========== 浮动客服 ========== */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 88px;
      z-index: 200;
      display: flex;
      flex-direction: column;
      gap: 10px;
      align-items: flex-end;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      border: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.72rem;
      font-weight: 700;
      color: #ffffff;
      background: var(--primary);
      box-shadow: var(--shadow-md);
      transition: transform 0.22s, box-shadow 0.22s, background 0.22s;
      line-height: 1.15;
      text-align: center;
      padding: 4px;
    }

    .float-btn:hover {
      transform: translateY(-3px) scale(1.04);
      box-shadow: var(--shadow-lg);
    }

    .float-btn.service-btn {
      background: var(--accent);
    }

    .float-qr-pop {
      display: none;
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 12px;
      box-shadow: var(--shadow-lg);
      text-align: center;
    }

    .float-qr-pop.show {
      display: block;
      animation: fadeInUp 0.25s ease;
    }

    .float-qr-pop img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      border-radius: var(--radius-sm);
      margin: 0 auto 8px;
    }

    .float-qr-pop p {
      font-size: 0.78rem;
      color: var(--text-muted);
    }

    .back-top {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 200;
      width: 46px;
      height: 46px;
      border-radius: 50%;
      border: 1px solid var(--border-light);
      background: #ffffff;
      color: var(--primary);
      font-size: 1.1rem;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-sm);
      opacity: 0;
      visibility: hidden;
      transform: translateY(10px);
      transition: opacity 0.28s, transform 0.28s, visibility 0.28s, box-shadow 0.2s;
    }

    .back-top.show {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }

    .back-top:hover {
      box-shadow: var(--shadow-md);
      background: var(--primary-soft);
    }

    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* ========== 滚动渐入 ========== */
    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease;
      will-change: opacity, transform;
    }

    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    .reveal-delay-1 { transition-delay: 0.08s; }
    .reveal-delay-2 { transition-delay: 0.16s; }
    .reveal-delay-3 { transition-delay: 0.24s; }

    /* ========== 响应式 ========== */
    @media (min-width: 1024px) {
      .nav-cta {
        display: inline-flex;
      }
    }

    @media (max-width: 1023px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--border-light);
        box-shadow: var(--shadow-md);
        flex-direction: column;
        padding: 10px 16px 16px;
        gap: 0;
        max-height: 70vh;
        overflow-y: auto;
      }

      .nav-links.open {
        display: flex;
      }

      .nav-links a {
        width: 100%;
        padding: 12px 14px;
        border-radius: var(--radius-sm);
      }

      .menu-toggle {
        display: flex;
      }

      .header-inner {
        position: relative;
      }

      .hero-grid {
        grid-template-columns: 1fr;
        gap: 36px;
      }

      .about-grid {
        grid-template-columns: 1fr;
        gap: 28px;
      }

      .steps-wrap {
        grid-template-columns: repeat(2, 1fr);
      }

      .form-layout {
        grid-template-columns: 1fr;
      }

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

    @media (max-width: 767px) {
      .section {
        padding: 44px 0;
      }

      .hero {
        padding: 52px 0 56px;
      }

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

      .stat-item {
        border-right: none;
        border-bottom: 1px solid var(--border-light);
      }

      .stat-item:nth-child(3),
      .stat-item:nth-child(4) {
        border-bottom: none;
      }

      .stat-item:nth-child(odd) {
        border-right: 1px solid var(--border-light);
      }

      .steps-wrap {
        grid-template-columns: 1fr;
      }

      .form-row {
        grid-template-columns: 1fr;
      }

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

      .compare-wrap {
        padding: 22px 16px;
      }

      .font-hero-desc {
        font-size: 0.95rem;
      }

      .float-service {
        right: 14px;
        bottom: 80px;
      }

      .back-top {
        right: 14px;
        bottom: 20px;
      }

      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    @media (max-width: 400px) {
      .hero-actions .btn {
        width: 100%;
      }
    }