/* --- 艳色潮流风 基础变量 (Light Vibrant Theme) --- */
    :root {
      --primary: #6366f1;
      --primary-hover: #4f46e5;
      --accent-pink: #ec4899;
      --accent-cyan: #06b6d4;
      --accent-amber: #f59e0b;
      --bg-base: #f8fafc;
      --bg-surface: #ffffff;
      --bg-glass: rgba(255, 255, 255, 0.85);
      --text-main: #0f172a;
      --text-sub: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-vibrant: linear-gradient(135deg, #6366f1, #ec4899);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --shadow-card: 0 10px 30px -10px rgba(99, 102, 241, 0.12);
      --shadow-hover: 0 20px 40px -12px rgba(236, 72, 153, 0.22);
    }

    /* Reset & Base */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.25s ease;
    }
    a:hover {
      color: var(--accent-pink);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* Layout System */
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .section-padding {
      padding: 80px 0;
    }
    .text-center {
      text-align: center;
    }

    /* Vibrant Typography & Badges */
    .section-title-wrap {
      margin-bottom: 48px;
      position: relative;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 16px;
      border-radius: 999px;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.1));
      color: var(--primary);
      font-size: 0.875rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      margin-bottom: 12px;
      border: 1px solid rgba(99, 102, 241, 0.2);
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 1.1rem;
      color: var(--text-sub);
      max-width: 720px;
      margin: 12px auto 0;
    }

    /* Vibrant Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: 999px;
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      border: none;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      text-align: center;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--accent-pink));
      color: #ffffff !important;
      box-shadow: 0 8px 20px -4px rgba(99, 102, 241, 0.4);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px -4px rgba(236, 72, 153, 0.5);
    }
    .btn-secondary {
      background: #ffffff;
      color: var(--text-main) !important;
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary) !important;
      transform: translateY(-2px);
    }

    /* Top Navigation Header */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: var(--bg-glass);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-logo {
      height: 40px;
      width: auto;
    }

    /* Strict Rule: .nav-links gap MUST be 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links li a {
      display: block;
      padding: 8px 12px;
      color: var(--text-sub);
      font-size: 0.92rem;
      font-weight: 600;
      text-decoration: none;
      white-space: nowrap;
      border-radius: 6px;
      transition: all 0.2s ease;
    }
    .nav-links li a:hover {
      color: var(--primary);
      background-color: rgba(99, 102, 241, 0.06);
    }
    .header-cta {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
    }

    /* Hero Section (STRICT: NO IMAGES inside Hero) */
    .hero-section {
      position: relative;
      padding: 100px 0 80px;
      background: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(236, 72, 153, 0.08) 0%, transparent 40%),
                  var(--bg-base);
      overflow: hidden;
    }
    .hero-container {
      display: grid;
      grid-template-columns: 1fr;
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 999px;
      background: #ffffff;
      border: 1px solid rgba(99, 102, 241, 0.3);
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--primary);
      margin: 0 auto 24px;
      box-shadow: 0 4px 15px rgba(99, 102, 241, 0.1);
    }
    .hero-h1 {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.25;
      letter-spacing: -1px;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #0f172a 30%, #6366f1 70%, #ec4899 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-sub);
      margin-bottom: 36px;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .hero-highlights {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
      gap: 16px;
      background: var(--bg-surface);
      padding: 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-color);
    }
    .metric-item {
      text-align: center;
    }
    .metric-val {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      display: block;
    }
    .metric-lbl {
      font-size: 0.85rem;
      color: var(--text-light);
      margin-top: 4px;
    }

    /* Common Card Styles */
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }
    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }
    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(99, 102, 241, 0.4);
    }
    .card-icon-badge {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.1));
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .feature-card p {
      font-size: 0.95rem;
      color: var(--text-sub);
    }

    /* Model Badges Grid */
    .model-tags-container {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-sub);
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.02);
      transition: all 0.2s ease;
    }
    .model-tag:hover {
      border-color: var(--accent-pink);
      color: var(--accent-pink);
      transform: scale(1.05);
    }

    /* Comparison Table Section */
    .rating-highlight-box {
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(236, 72, 153, 0.05));
      border: 2px solid var(--primary);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 20px;
    }
    .rating-score {
      text-align: center;
    }
    .rating-num {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--accent-pink);
      line-height: 1;
    }
    .stars {
      color: var(--accent-amber);
      font-size: 1.2rem;
      margin-top: 4px;
    }
    .comparison-table-wrapper {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-color);
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .comparison-table th {
      background: #f1f5f9;
      font-weight: 700;
      color: var(--text-main);
    }
    .comparison-table tr:hover {
      background-color: rgba(99, 102, 241, 0.02);
    }
    .highlight-cell {
      font-weight: 700;
      color: var(--primary);
      background-color: rgba(99, 102, 241, 0.04);
    }

    /* Steps Section */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 24px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      padding: 28px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .step-num {
      font-size: 2.5rem;
      font-weight: 900;
      color: rgba(99, 102, 241, 0.2);
      position: absolute;
      top: 12px;
      right: 16px;
    }

    /* FAQ Accordion */
    .faq-grid {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: all 0.25s ease;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }
    .faq-question::after {
      content: "+";
      font-size: 1.4rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-question::after {
      transform: rotate(45%deg);
      content: "×";
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      padding: 0 24px;
      background: #f8fafc;
      color: var(--text-sub);
      font-size: 0.95rem;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px;
      border-top: 1px solid var(--border-color);
    }

    /* Reviews Section */
    .review-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }
    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent-pink));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    .user-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
    }
    .user-info p {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* Form & Contact Section */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-color);
    }
    .contact-form-group {
      margin-bottom: 20px;
    }
    .contact-form-group label {
      display: block;
      font-weight: 600;
      margin-bottom: 8px;
      font-size: 0.9rem;
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #f8fafc;
      transition: border 0.2s ease;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
    }
    .qr-box {
      text-align: center;
      padding: 24px;
      background: #f8fafc;
      border-radius: var(--radius-md);
      border: 1px dashed var(--border-color);
    }
    .qr-img {
      max-width: 160px;
      margin: 12px auto;
      border-radius: 8px;
      box-shadow: var(--shadow-sm);
    }

    /* Footer Section */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 0.9rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 32px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 8px;
    }
    .footer-links a {
      color: #94a3b8;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-top: 24px;
    }
    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-top: 12px;
    }
    .friend-links-list a {
      color: #64748b;
      font-size: 0.85rem;
    }
    .friend-links-list a:hover {
      color: var(--accent-pink);
    }
    .copyright-bar {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* Floating Widget */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 20px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      cursor: pointer;
      font-size: 1.2rem;
      transition: transform 0.2s ease;
    }
    .float-btn:hover {
      transform: scale(1.1);
    }

    /* Article List Styling */
    .article-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }
    .article-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 20px;
      transition: all 0.2s ease;
    }
    .article-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .article-card h4 {
      font-size: 1rem;
      margin-bottom: 8px;
      line-height: 1.4;
    }
    .article-card a {
      color: var(--text-main);
    }
    .article-card a:hover {
      color: var(--primary);
    }

    /* Mobile Responsive Adaptation */
    @media (max-width: 992px) {
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .hero-h1 {
        font-size: 2.1rem;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .section-padding {
        padding: 50px 0;
      }
    }