/* CSS Standard Reset & Variables - Crimson Red Theme */
    :root {
      --primary-red: #dc2626;
      --primary-red-dark: #b91c1c;
      --primary-red-deep: #991b1b;
      --primary-red-light: #fee2e2;
      --primary-red-soft: #fef2f2;
      --accent-red: #ef4444;
      --text-main: #1f2937;
      --text-muted: #4b5563;
      --text-light: #9ca3af;
      --bg-main: #ffffff;
      --bg-alt: #fcf8f8;
      --bg-card: #ffffff;
      --border-color: #f3d0d0;
      --shadow-sm: 0 2px 8px rgba(220, 38, 38, 0.06);
      --shadow-md: 0 4px 20px rgba(220, 38, 38, 0.1);
      --shadow-lg: 0 10px 30px rgba(185, 28, 28, 0.15);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --container-width: 1200px;
      --transition-base: all 0.3s ease;
    }

    *, *::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, "Noto Sans", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition-base);
    }

    ul, ol {
      list-style: none;
    }

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

    /* Container Standard Alignment */
    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* Standard Header / Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

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

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

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary-red-dark);
      letter-spacing: -0.5px;
    }

    /* Nav Links Requirement: gap MUST be 0 */
    .nav-links {
      display: flex;
      gap: 0;
      align-items: center;
    }

    .nav-links a {
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
      white-space: nowrap;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition-base);
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-red) 0%, var(--primary-red-dark) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(220, 38, 38, 0.3);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--accent-red) 0%, var(--primary-red) 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(220, 38, 38, 0.4);
    }

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

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

    .btn-lg {
      padding: 14px 28px;
      font-size: 16px;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary-red-dark);
      cursor: pointer;
    }

    /* Section Global Styles */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-alt);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

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

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background-color: var(--primary-red-soft);
      color: var(--primary-red);
      border: 1px solid var(--primary-red-light);
      border-radius: 50px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 首屏 HERO (Strict: No images allowed here) */
    .hero-section {
      padding: 100px 0 80px;
      background: radial-gradient(circle at 50% 10%, #fff1f1 0%, #ffffff 70%);
      text-align: center;
      overflow: hidden;
    }

    .hero-badge-group {
      display: flex;
      justify-content: center;
      gap: 12px;
      margin-bottom: 24px;
      flex-wrap: wrap;
    }

    .hero-badge {
      background: #ffffff;
      border: 1px solid var(--primary-red-light);
      box-shadow: var(--shadow-sm);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 13px;
      color: var(--primary-red-dark);
      font-weight: 600;
    }

    .hero-title-h1 {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      color: #111827;
      margin-bottom: 20px;
      max-width: 900px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-title-h1 span {
      color: var(--primary-red);
      background: linear-gradient(135deg, var(--primary-red) 0%, #991b1b 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.8;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    /* Hero Stats Cards */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
    }

    .stat-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-red);
    }

    .stat-number {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary-red);
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Grid Layouts */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    /* Cards Style */
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition-base);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent-red);
    }

    .feature-icon-box {
      width: 48px;
      height: 48px;
      background: var(--primary-red-soft);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-red);
      font-size: 20px;
      font-weight: bold;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .feature-card .card-footer-tag {
      margin-top: 16px;
      font-size: 12px;
      color: var(--primary-red-dark);
      font-weight: 600;
      display: inline-block;
    }

    /* Image Display Wrapper */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
    }

    .media-card:hover {
      box-shadow: var(--shadow-md);
    }

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

    .ai-page-image {
      border-radius: var(--radius-sm);
      width: 100%;
      object-fit: cover;
    }

    /* Comparison Section (Ratings & Table) */
    .rating-banner {
      background: linear-gradient(135deg, var(--primary-red-dark) 0%, var(--primary-red-deep) 100%);
      color: #ffffff;
      border-radius: var(--radius-md);
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 40px;
      box-shadow: var(--shadow-md);
    }

    .rating-info h3 {
      font-size: 24px;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .rating-score {
      font-size: 40px;
      font-weight: 900;
      color: #fef08a;
    }

    .rating-stars {
      color: #facc15;
      font-size: 20px;
      letter-spacing: 2px;
    }

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

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

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

    .comp-table th {
      background-color: var(--primary-red-soft);
      color: var(--primary-red-dark);
      font-weight: 700;
    }

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

    .comp-table .highlight-cell {
      background-color: #fff1f1;
      font-weight: 700;
      color: var(--primary-red-dark);
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition-base);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 16px;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: var(--bg-card);
    }

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

    .faq-icon {
      font-size: 18px;
      transition: transform 0.3s ease;
      color: var(--primary-red);
    }

    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      padding: 0 24px 20px;
      max-height: 300px;
    }

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

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

    .testimonial-quote {
      font-size: 14px;
      color: var(--text-muted);
      font-style: italic;
      margin-bottom: 20px;
      line-height: 1.7;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      background: var(--primary-red-soft);
      color: var(--primary-red-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 16px;
    }

    .author-info h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-info p {
      font-size: 12px;
      color: var(--text-light);
    }

    /* Contact Form Section */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-side h3 {
      font-size: 24px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .contact-item-list {
      margin: 24px 0;
    }

    .contact-item-list li {
      margin-bottom: 14px;
      font-size: 15px;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .qr-box {
      margin-top: 20px;
      text-align: center;
      width: 140px;
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
    }

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

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #d1d5db;
      border-radius: var(--radius-sm);
      font-size: 14px;
      transition: var(--transition-base);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-red);
      box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
    }

    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }

    /* Tag Cloud & Tokens List */
    .token-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .token-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
    }

    .token-tag.hot {
      background: var(--primary-red-soft);
      border-color: var(--primary-red-light);
      color: var(--primary-red-dark);
    }

    /* Footer & Friendship Links */
    .site-footer {
      background-color: #111827;
      color: #9ca3af;
      padding: 60px 0 30px;
      font-size: 14px;
    }

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

    .footer-brand h3 {
      color: #ffffff;
      font-size: 20px;
      margin-bottom: 12px;
    }

    .footer-links h4 {
      color: #ffffff;
      font-size: 16px;
      margin-bottom: 16px;
    }

    .footer-links ul li {
      margin-bottom: 10px;
    }

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

    .friendship-links {
      border-top: 1px solid #1f2937;
      padding-top: 24px;
      margin-top: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .friendship-links span {
      color: #d1d5db;
      font-weight: bold;
    }

    .friendship-links a {
      color: #9ca3af;
    }

    .friendship-links a:hover {
      color: #ef4444;
    }

    .footer-bottom {
      border-top: 1px solid #1f2937;
      padding-top: 24px;
      text-align: center;
      color: #6b7280;
      font-size: 13px;
    }

    /* Floating Widget */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      background: var(--primary-red);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      line-height: 1.2;
      transition: var(--transition-base);
    }

    .float-btn:hover {
      transform: scale(1.1);
      background: var(--primary-red-dark);
    }

    /* Media Queries */
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .hero-title-h1 { font-size: 28px; }
      .hero-subtitle { font-size: 15px; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .mobile-menu-toggle { display: block; }
      .grid-2, .grid-3, .grid-4, .stats-grid { grid-template-columns: 1fr; }
      .contact-wrapper { grid-template-columns: 1fr; padding: 20px; }
      .rating-banner { flex-direction: column; text-align: center; gap: 16px; }
      .footer-grid { grid-template-columns: 1fr; }
    }