:root {
      --primary: #4f46e5;
      --primary-dark: #3730a3;
      --accent: #ec4899;
      --accent-warm: #f59e0b;
      --accent-cyan: #06b6d4;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-sub: #334155;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --border-accent: rgba(79, 70, 229, 0.15);
      --gradient-main: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #ec4899 100%);
      --gradient-card: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
      --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(79, 70, 229, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 20px 35px -10px rgba(79, 70, 229, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      overflow-x: hidden;
      min-width: 320px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      background: rgba(79, 70, 229, 0.08);
      border: 1px solid rgba(79, 70, 229, 0.2);
      border-radius: 20px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 15px;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 顶部导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand-box .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
      object-fit: contain;
    }

    .brand-box .ai-page-home-link {
      font-size: 14px;
      color: var(--text-muted);
      padding: 4px 8px;
      border-radius: 4px;
      background: #f1f5f9;
    }

    .brand-box .ai-page-home-link:hover {
      color: var(--primary);
      background: #e2e8f0;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-sub);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }

    .nav-links a:hover {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.05);
    }

    .nav-action {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 8px 18px;
      font-size: 14px;
      font-weight: 600;
      color: #ffffff !important;
      background: var(--gradient-main);
      border-radius: 30px;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .btn-portal:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(79, 70, 229, 0.4);
    }

    .nav-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 6px 10px;
      border-radius: 6px;
      cursor: pointer;
      font-size: 16px;
    }

    /* 首屏 Hero (严格无图片) */
    .hero-section {
      padding: 70px 0 60px;
      background: radial-gradient(circle at 50% -20%, rgba(79, 70, 229, 0.15), rgba(236, 72, 153, 0.08) 50%, rgba(248, 250, 252, 1) 90%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 30px;
      font-size: 13px;
      color: var(--primary);
      font-weight: 600;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-pill-badge {
      background: #ec4899;
      color: #fff;
      font-size: 11px;
      padding: 2px 8px;
      border-radius: 10px;
    }

    .hero-title {
      font-size: 40px;
      line-height: 1.25;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title span {
      background: var(--gradient-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-lead {
      font-size: 17px;
      color: var(--text-sub);
      max-width: 740px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-btns {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .btn-main-glow {
      padding: 14px 34px;
      font-size: 16px;
      font-weight: 700;
      color: #ffffff !important;
      background: var(--gradient-main);
      border-radius: 36px;
      box-shadow: 0 10px 25px rgba(79, 70, 229, 0.35);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.25s ease;
    }

    .btn-main-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 30px rgba(79, 70, 229, 0.5);
    }

    .btn-sub-outline {
      padding: 13px 30px;
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 36px;
      display: inline-flex;
      align-items: center;
      transition: all 0.2s ease;
    }

    .btn-sub-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f8fafc;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-md);
      text-align: left;
    }

    .metric-item {
      padding: 8px 12px;
      border-left: 3px solid var(--primary);
    }

    .metric-item:nth-child(2) { border-color: var(--accent); }
    .metric-item:nth-child(3) { border-color: var(--accent-warm); }
    .metric-item:nth-child(4) { border-color: var(--accent-cyan); }

    .metric-val {
      font-size: 24px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.2;
    }

    .metric-desc {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 平台支持模型标签流 */
    .models-bar {
      padding: 20px 0;
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
    }

    .models-bar-inner {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .models-bar-label {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-main);
      margin-right: 8px;
    }

    .model-badge {
      font-size: 12px;
      font-weight: 600;
      color: var(--text-sub);
      background: #f1f5f9;
      padding: 4px 10px;
      border-radius: 6px;
      border: 1px solid #e2e8f0;
      transition: background 0.2s;
    }

    .model-badge:hover {
      background: #e2e8f0;
      color: var(--primary);
    }

    /* 卡片网格通用 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .card-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
      position: relative;
    }

    .card-box:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(79, 70, 229, 0.4);
    }

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 16px;
      color: #fff;
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-text {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 平台能力与一站式制作卡片 */
    .feature-tag {
      font-size: 11px;
      padding: 2px 8px;
      background: #e0e7ff;
      color: var(--primary-dark);
      border-radius: 4px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 8px;
    }

    /* 流程步骤 */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .flow-step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .flow-step-num {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--gradient-main);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      font-weight: 800;
      margin-bottom: 14px;
    }

    /* 对比评测表格 */
    .eval-score-card {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-left h3 {
      font-size: 24px;
      margin-bottom: 8px;
    }

    .score-left p {
      color: #c7d2fe;
      font-size: 14px;
    }

    .score-right {
      display: flex;
      align-items: center;
      gap: 24px;
    }

    .score-val {
      font-size: 48px;
      font-weight: 900;
      color: #fbbf24;
      line-height: 1;
    }

    .score-stars {
      color: #fbbf24;
      font-size: 20px;
      margin-bottom: 4px;
    }

    .score-sub {
      font-size: 13px;
      color: #e0e7ff;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      font-size: 14px;
      border-bottom: 1px solid var(--border-color);
    }

    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .compare-table td:nth-child(2) {
      font-weight: 700;
      color: var(--primary);
      background: rgba(79, 70, 229, 0.02);
    }

    .badge-win {
      display: inline-block;
      padding: 2px 8px;
      border-radius: 4px;
      background: #dcfce7;
      color: #15803d;
      font-weight: 600;
      font-size: 12px;
    }

    /* 案例展示 */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .media-card-img-wrap {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .media-card-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: contain;
    }

    .media-card-body {
      padding: 20px;
    }

    /* 用户评论 */
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
      padding-top: 16px;
      border-top: 1px solid #f1f5f9;
    }

    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--gradient-main);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
    }

    .author-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ折叠面板 */
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: border-color 0.2s;
    }

    .faq-item.active {
      border-color: var(--primary);
    }

    .faq-q {
      padding: 16px 20px;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }

    .faq-q:hover {
      background: #f8fafc;
    }

    .faq-arrow {
      font-size: 16px;
      transition: transform 0.25s ease;
      color: var(--primary);
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }

    .faq-a {
      padding: 0 20px 16px;
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.6;
      display: none;
      background: #ffffff;
    }

    .faq-item.active .faq-a {
      display: block;
    }

    /* 表单与需求匹配 */
    .form-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 36px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 14px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      outline: none;
      color: var(--text-main);
      background: #fff;
      transition: border-color 0.2s, box-shadow 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

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

    .btn-submit {
      width: 100%;
      padding: 14px;
      font-size: 16px;
      font-weight: 700;
      color: #fff;
      background: var(--gradient-main);
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
      transition: transform 0.2s, opacity 0.2s;
    }

    .btn-submit:hover {
      opacity: 0.95;
      transform: translateY(-1px);
    }

    /* 文章列表 */
    .article-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .article-link {
      font-size: 13px;
      color: var(--primary);
      font-weight: 600;
      margin-top: 12px;
      display: inline-block;
    }

    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 1000;
      background: #ffffff;
      border-radius: 50%;
      box-shadow: var(--shadow-lg);
      border: 2px solid var(--primary);
      width: 60px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: transform 0.25s;
    }

    .float-kefu:hover {
      transform: scale(1.08);
    }

    .float-kefu-pop {
      position: absolute;
      bottom: 70px;
      right: 0;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 16px;
      box-shadow: var(--shadow-lg);
      width: 220px;
      text-align: center;
      display: none;
    }

    .float-kefu:hover .float-kefu-pop {
      display: block;
    }

    .float-kefu-pop img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      margin-bottom: 8px;
    }

    /* 页脚 */
    .page-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #f8fafc;
      font-size: 16px;
      margin-bottom: 16px;
      font-weight: 700;
    }

    .footer-col ul li {
      margin-bottom: 10px;
      font-size: 14px;
    }

    .footer-col ul li a {
      color: #94a3b8;
    }

    .footer-col ul li a:hover {
      color: #ffffff;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 8px;
    }

    .friend-links a {
      color: #cbd5e1;
      font-size: 13px;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid #334155;
    }

    .friend-links a:hover {
      color: #fff;
      background: var(--primary);
    }

    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      border-top: 1px solid #1e293b;
      font-size: 13px;
      color: #64748b;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .flow-steps { grid-template-columns: repeat(2, 1fr); }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .faq-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; width: 100%; position: absolute; top: 72px; left: 0; background: #ffffff; flex-direction: column; padding: 20px; box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
      .nav-links.active { display: flex; }
      .nav-toggle { display: block; }
      .grid-3, .grid-4, .grid-2, .flow-steps, .hero-metrics, .footer-grid, .form-row { grid-template-columns: 1fr; }
      .hero-title { font-size: 28px; }
      .section-title { font-size: 24px; }
      .eval-score-card { flex-direction: column; text-align: center; }
    }