:root {
      --primary-deep: #be123c;
      --primary-rose: #e11d48;
      --primary-light: #f43f5e;
      --primary-soft: #ffe4e6;
      --primary-tint: #fff1f2;
      --text-main: #1f2937;
      --text-muted: #4b5563;
      --text-light: #6b7280;
      --bg-white: #ffffff;
      --bg-warm: #fff9fa;
      --bg-card: #ffffff;
      --border-rose: #fecdd3;
      --border-subtle: #f3f4f6;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 4px 12px rgba(225, 29, 72, 0.04);
      --shadow-md: 0 8px 24px rgba(225, 29, 72, 0.08);
      --shadow-lg: 0 16px 36px rgba(225, 29, 72, 0.12);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-rose);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

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

    .brand-wrap .ai-page-logo {
      height: 42px;
      width: auto;
    }

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

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--primary-rose);
      background-color: var(--primary-tint);
    }

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

    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, var(--primary-rose) 0%, var(--primary-deep) 100%);
      color: #ffffff !important;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 50px;
      box-shadow: 0 4px 14px rgba(225, 29, 72, 0.3);
      transition: var(--transition);
      border: none;
      cursor: pointer;
      font-size: 14px;
    }

    .btn-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(225, 29, 72, 0.45);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--primary-tint);
      color: var(--primary-deep) !important;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 50px;
      border: 1px solid var(--border-rose);
      transition: var(--transition);
      cursor: pointer;
      font-size: 14px;
    }

    .btn-outline:hover {
      background: var(--primary-soft);
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: transparent;
      border: 1px solid var(--border-rose);
      border-radius: var(--radius-sm);
      padding: 6px 10px;
      color: var(--primary-deep);
      font-size: 18px;
      cursor: pointer;
    }

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

    .section-head {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 45px auto;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-tint);
      color: var(--primary-rose);
      font-size: 13px;
      font-weight: 600;
      border-radius: 50px;
      border: 1px solid var(--border-rose);
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .section-head h2 {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-head p {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 10%, rgba(244, 63, 94, 0.12) 0%, rgba(255, 249, 250, 0) 70%);
      position: relative;
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      padding: 6px 18px;
      border-radius: 50px;
      border: 1px solid var(--border-rose);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      font-size: 14px;
      color: var(--primary-deep);
      font-weight: 600;
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary-rose);
      animation: pulseDot 1.8s infinite;
    }

    @keyframes pulseDot {
      0% { transform: scale(0.9); opacity: 0.8; }
      50% { transform: scale(1.3); opacity: 1; }
      100% { transform: scale(0.9); opacity: 0.8; }
    }

    .hero-content h1 {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-content h1 span {
      color: var(--primary-rose);
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-btn-official {
      font-size: 16px;
      padding: 14px 34px;
      border-radius: 50px;
      background: linear-gradient(135deg, #e11d48 0%, #9f1239 100%);
      color: #fff !important;
      font-weight: 700;
      box-shadow: 0 10px 25px rgba(225, 29, 72, 0.35);
      transition: var(--transition);
      border: none;
    }

    .hero-btn-official:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 14px 30px rgba(225, 29, 72, 0.45);
    }

    .stats-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: #ffffff;
      padding: 24px 30px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-rose);
      box-shadow: var(--shadow-md);
      text-align: center;
    }

    .stat-item h3 {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary-deep);
      margin-bottom: 4px;
    }

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

    .model-marquee-wrap {
      margin-top: 36px;
      padding: 16px 20px;
      background: rgba(255, 255, 255, 0.85);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-rose);
      display: flex;
      flex-direction: column;
      gap: 10px;
      align-items: center;
    }

    .model-tag-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }

    .model-tag {
      background: var(--primary-tint);
      color: var(--primary-deep);
      border: 1px solid var(--border-rose);
      padding: 4px 12px;
      border-radius: 30px;
      font-size: 12px;
      font-weight: 600;
    }

    .grid-cards {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-rose);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

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

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      background: var(--primary-tint);
      color: var(--primary-rose);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 16px;
      border: 1px solid var(--border-rose);
    }

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

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

    .card-footer {
      font-size: 13px;
      color: var(--primary-deep);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }

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

    .intro-text p {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 16px;
      line-height: 1.7;
    }

    .intro-feature-list {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-top: 20px;
    }

    .intro-feature-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }

    .intro-feature-item::before {
      content: "✓";
      color: var(--primary-rose);
      font-weight: bold;
    }

    .intro-box {
      background: #ffffff;
      border: 1px solid var(--border-rose);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-md);
    }

    .intro-box-item {
      padding: 16px 0;
      border-bottom: 1px dashed var(--border-rose);
    }

    .intro-box-item:last-child {
      border-bottom: none;
      padding-bottom: 0;
    }

    .intro-box-item h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 6px;
    }

    .intro-box-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

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

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-rose);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary-rose);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-size: 16px;
    }

    .step-card h4 {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .compare-score-banner {
      background: linear-gradient(135deg, var(--primary-tint) 0%, #ffffff 100%);
      border: 1px solid var(--border-rose);
      border-radius: var(--radius-lg);
      padding: 24px 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 30px;
      box-shadow: var(--shadow-sm);
    }

    .score-left h3 {
      font-size: 22px;
      font-weight: 800;
      color: var(--primary-deep);
      margin-bottom: 4px;
    }

    .score-left p {
      font-size: 14px;
      color: var(--text-muted);
    }

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

    .score-val {
      font-size: 44px;
      font-weight: 900;
      color: var(--primary-rose);
      line-height: 1;
    }

    .score-max {
      font-size: 18px;
      color: var(--text-light);
      font-weight: 600;
    }

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

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

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

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

    .compare-table tr:hover td {
      background-color: var(--bg-warm);
    }

    .compare-table .highlight-col {
      color: var(--primary-deep);
      font-weight: 700;
      background-color: rgba(244, 63, 94, 0.03);
    }

    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-rose);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 16px;
      color: var(--text-main);
      user-select: none;
    }

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

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
      background-color: var(--primary-tint);
    }

    .faq-answer-inner {
      padding: 16px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px solid var(--border-rose);
    }

    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: 20px;
    }

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

    .review-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-tint);
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
      border: 1px solid var(--border-rose);
    }

    .review-user-info h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .review-user-info span {
      font-size: 12px;
      color: var(--text-light);
    }

    .review-stars {
      color: #f59e0b;
      font-size: 13px;
      margin-bottom: 10px;
    }

    .review-content {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      font-style: italic;
    }

    .media-showcase {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
      margin-top: 30px;
    }

    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-rose);
      border-radius: var(--radius-md);
      padding: 14px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .media-img-wrap {
      border-radius: var(--radius-sm);
      overflow: hidden;
      background: #fdf2f4;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .media-img-wrap img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .media-info h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .media-info p {
      font-size: 13px;
      color: var(--text-muted);
    }

    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 24px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-rose);
      border-radius: var(--radius-sm);
      padding: 16px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-item:hover {
      border-color: var(--primary-rose);
      transform: translateY(-3px);
    }

    .article-item h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
      line-height: 1.4;
    }

    .article-link {
      font-size: 13px;
      color: var(--primary-rose);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .form-section-inner {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-rose);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-block {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-info-block h3 {
      font-size: 26px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .contact-info-block p {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 24px;
    }

    .contact-details {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .contact-row {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 14px;
      color: var(--text-main);
      font-weight: 500;
    }

    .contact-icon {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--primary-tint);
      color: var(--primary-rose);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      border: 1px solid var(--border-rose);
    }

    .qr-block {
      display: flex;
      align-items: center;
      gap: 16px;
      background: var(--primary-tint);
      border: 1px solid var(--border-rose);
      border-radius: var(--radius-md);
      padding: 16px;
      margin-top: 20px;
    }

    .qr-block img {
      width: 80px;
      height: 80px;
      border-radius: var(--radius-sm);
      border: 1px solid #fff;
    }

    .qr-text h5 {
      font-size: 14px;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 4px;
    }

    .qr-text p {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 0;
    }

    .form-wrap {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

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

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-rose);
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-main);
      background-color: var(--bg-warm);
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary-rose);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(244, 63, 94, 0.15);
    }

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

    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-rose);
      padding: 50px 0 24px;
      color: var(--text-muted);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 2fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links a {
      font-size: 14px;
      color: var(--text-muted);
      transition: var(--transition);
    }

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

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friend-links-wrap a {
      font-size: 13px;
      color: var(--text-muted);
      background: var(--primary-tint);
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid var(--border-rose);
      transition: var(--transition);
    }

    .friend-links-wrap a:hover {
      color: var(--primary-rose);
      border-color: var(--primary-rose);
    }

    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      border-top: 1px solid var(--border-subtle);
      font-size: 13px;
      color: var(--text-light);
    }

    .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-rose);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-rose);
      cursor: pointer;
      font-weight: bold;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary-rose);
      color: #ffffff;
      transform: translateY(-3px);
    }

    .back-to-top {
      display: none;
    }

    @media (max-width: 992px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-rose);
        box-shadow: var(--shadow-md);
      }

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

      .menu-toggle {
        display: block;
      }

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

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

      .intro-grid, .form-section-inner {
        grid-template-columns: 1fr;
      }

      .media-showcase {
        grid-template-columns: 1fr;
      }

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

    @media (max-width: 576px) {
      .hero-content h1 {
        font-size: 28px;
      }
      .stats-bar {
        grid-template-columns: 1fr;
      }
      .steps-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .header-actions .btn-outline {
        display: none;
      }
    }