:root {
      --bg-base: #f7f9fc;
      --bg-surface: #ffffff;
      --bg-subtle: #f1f4f9;
      --text-main: #141b2d;
      --text-muted: #526079;
      --text-light: #7e8ba0;
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #06b6d4;
      --accent: #d946ef;
      --border-color: rgba(148, 163, 184, 0.25);
      --border-focus: #818cf8;
      --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
      --card-hover-shadow: 0 20px 35px -10px rgba(99, 102, 241, 0.15), 0 8px 12px -4px rgba(0, 0, 0, 0.04);
      --hologram-gradient: linear-gradient(135deg, rgba(238, 242, 255, 0.8) 0%, rgba(245, 243, 255, 0.8) 50%, rgba(236, 254, 255, 0.8) 100%);
      --laser-border: linear-gradient(90deg, #6366f1, #d946ef, #06b6d4, #6366f1);
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

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

    body {
      font-family: var(--font-family);
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      background-image: 
        radial-gradient(at 10% 10%, rgba(99, 102, 241, 0.08) 0px, transparent 50%),
        radial-gradient(at 90% 20%, rgba(217, 70, 239, 0.06) 0px, transparent 50%),
        radial-gradient(at 50% 80%, rgba(6, 182, 212, 0.06) 0px, transparent 50%);
      background-attachment: fixed;
    }

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

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

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    }

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

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

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

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
    }

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 0.935rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: 6px;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(99, 102, 241, 0.06);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 22px;
      border-radius: 8px;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      line-height: 1.2;
      text-align: center;
    }

    .btn-laser {
      background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #06b6d4 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
      position: relative;
      background-size: 200% 200%;
      animation: laserGaze 6s ease infinite;
    }

    .btn-laser:hover {
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      box-shadow: 0 2px 5px rgba(0,0,0,0.04);
    }

    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #fcfdfe;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .menu-toggle span {
      width: 24px;
      height: 2px;
      background-color: var(--text-main);
      transition: 0.3s;
    }

    /* 区域排版规范 */
    .section-padding {
      padding: 80px 0;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.825rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      padding: 5px 14px;
      border-radius: 50px;
      background: rgba(99, 102, 241, 0.1);
      color: var(--primary);
      margin-bottom: 12px;
      border: 1px solid rgba(99, 102, 241, 0.2);
    }

    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* Hero 首屏 (无图规范) */
    .hero-section {
      padding: 85px 0 65px;
      position: relative;
      overflow: hidden;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.9) 0%, rgba(247, 249, 252, 0.6) 100%);
    }

    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge-wrap {
      margin-bottom: 24px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid rgba(99, 102, 241, 0.25);
      border-radius: 50px;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--primary);
      box-shadow: 0 4px 15px rgba(99, 102, 241, 0.08);
    }

    .hero-badge .pulse-dot {
      width: 8px;
      height: 8px;
      background: #10b981;
      border-radius: 50%;
      box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
      animation: pulse 2s infinite;
    }

    .hero-title {
      font-size: 2.85rem;
      font-weight: 900;
      line-height: 1.22;
      color: var(--text-main);
      margin-bottom: 22px;
      letter-spacing: -1px;
    }

    .hero-highlight {
      background: linear-gradient(135deg, #4f46e5 0%, #a855f7 50%, #06b6d4 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-btn-lg {
      padding: 14px 34px;
      font-size: 1.05rem;
      border-radius: 10px;
    }

    /* 首屏数据指标卡片 (纯CSS/几何构建) */
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 20px;
    }

    .stat-card {
      background: #ffffff;
      padding: 24px 20px;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      position: relative;
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: linear-gradient(90deg, #4f46e5, #06b6d4);
    }

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

    .stat-num {
      font-size: 1.95rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.875rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台核心矩阵 */
    .models-marquee-section {
      padding: 30px 0;
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .marquee-label {
      text-align: center;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-light);
      margin-bottom: 16px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .marquee-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      max-width: 1180px;
      margin: 0 auto;
    }

    .model-chip {
      background: var(--bg-base);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      transition: all 0.2s ease;
    }

    .model-chip:hover {
      background: #ffffff;
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
      box-shadow: 0 4px 10px rgba(79, 70, 229, 0.1);
    }

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

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

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

    .laser-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 28px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      position: relative;
      display: flex;
      flex-direction: column;
    }

    .laser-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(99, 102, 241, 0.4);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 20px;
      color: var(--primary);
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .card-desc {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-feature-list {
      list-style: none;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
      margin-top: auto;
    }

    .card-feature-list li {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .card-feature-list li::before {
      content: "✓";
      color: #10b981;
      font-weight: 700;
    }

    /* 流程与步骤 */
    .step-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      position: relative;
    }

    .step-num {
      position: absolute;
      top: 16px;
      right: 16px;
      font-size: 1.8rem;
      font-weight: 900;
      color: rgba(99, 102, 241, 0.12);
      line-height: 1;
    }

    .step-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .step-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 案例图片展示容器 */
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 30px;
    }

    .media-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: transform 0.3s ease;
    }

    .media-container:hover {
      transform: translateY(-4px);
    }

    .media-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: var(--bg-subtle);
      overflow: hidden;
    }

    .media-img-wrap.square {
      aspect-ratio: 1 / 1;
    }

    .media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .media-container:hover .media-img-wrap img {
      transform: scale(1.03);
    }

    .media-info {
      padding: 20px;
    }

    .media-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .media-tag {
      font-size: 0.8rem;
      color: var(--primary);
      font-weight: 600;
    }

    /* 评分评测专区 */
    .review-score-hero {
      background: linear-gradient(135deg, #ffffff 0%, #f4f6ff 100%);
      border: 1px solid rgba(99, 102, 241, 0.2);
      border-radius: 16px;
      padding: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 40px;
      box-shadow: 0 15px 30px rgba(99, 102, 241, 0.06);
    }

    .score-left h3 {
      font-size: 1.6rem;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .score-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
      margin-bottom: 6px;
    }

    .score-badge {
      display: flex;
      align-items: baseline;
      gap: 6px;
    }

    .score-val {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .score-max {
      font-size: 1.25rem;
      color: var(--text-light);
      font-weight: 700;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      box-shadow: var(--card-shadow);
    }

    .data-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .data-table th {
      background: #f8fafc;
      padding: 16px 20px;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      border-bottom: 1px solid var(--border-color);
    }

    .data-table td {
      padding: 16px 20px;
      font-size: 0.9rem;
      color: var(--text-muted);
      border-bottom: 1px solid var(--border-color);
    }

    .data-table tr:last-child td {
      border-bottom: none;
    }

    .data-table tr:hover td {
      background: #fafbff;
    }

    .highlight-cell {
      font-weight: 700;
      color: var(--primary) !important;
    }

    /* 用户评论 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-text {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
      font-style: italic;
    }

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

    .avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, #6366f1, #06b6d4);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .user-info .user-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-info .user-role {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

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

    .faq-question {
      padding: 18px 22px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1rem;
      color: var(--text-main);
      user-select: none;
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
      color: var(--text-light);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 22px;
      color: var(--text-muted);
      font-size: 0.925rem;
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      padding-bottom: 18px;
    }

    /* 表单区域 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 40px;
      box-shadow: var(--card-shadow);
      max-width: 760px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }

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

    .form-group.full-width {
      grid-column: span 2;
    }

    .form-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      background: var(--bg-base);
      font-size: 0.95rem;
      color: var(--text-main);
      font-family: inherit;
      transition: all 0.2s ease;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    }

    /* 底部专属与友情链接 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px;
      color: var(--text-muted);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: var(--text-main);
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

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

    .footer-qr {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-qr img {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
      text-align: center;
      font-size: 0.875rem;
      color: var(--text-light);
    }

    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 14px;
    }

    .friend-links-box a {
      color: var(--text-muted);
      font-size: 0.85rem;
    }

    .friend-links-box a:hover {
      color: var(--primary);
    }

    /* 浮动客服 */
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 15px rgba(0,0,0,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--text-main);
      transition: all 0.25s ease;
      font-size: 1.2rem;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: scale(1.08);
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
      70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
      100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
    }

    @keyframes laserGaze {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }

    /* 响应式媒体查询 */
    @media (max-width: 1024px) {
      .hero-title { font-size: 2.35rem; }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .menu-toggle { display: flex; }
      .nav-wrapper {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        display: none;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-wrapper.active { display: block; }
      .nav-links { flex-direction: column; align-items: stretch; gap: 4px; }
      .nav-links li a { padding: 12px; }
      .hero-title { font-size: 1.85rem; }
      .hero-stats-grid { grid-template-columns: 1fr; }
      .grid-3, .grid-2, .media-card-grid { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .form-group.full-width { grid-column: span 1; }
      .footer-grid { grid-template-columns: 1fr; }
      .review-score-hero { flex-direction: column; text-align: center; gap: 20px; }
    }