:root {
      --primary: #f43f5e;
      --primary-hover: #e11d48;
      --secondary: #0ea5e9;
      --accent: #8b5cf6;
      --warning: #f59e0b;
      --dark: #0f172a;
      --dark-light: #1e293b;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-page: #fafaf9;
      --bg-card: #ffffff;
      --border-color: #f1f5f9;
      --border-highlight: #e2e8f0;
      --gradient-pop: linear-gradient(135deg, #ff007a 0%, #7928ca 50%, #0070f3 100%);
      --gradient-soft: linear-gradient(180deg, #fff5f5 0%, #fafaf9 100%);
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-lg: 0 20px 30px -10px rgba(244, 63, 94, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.25s 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", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    ul, ol {
      list-style: none;
    }
    .main-container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .header-bar {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-highlight);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
    }
    .nav-links a:hover {
      color: var(--primary);
      background-color: #fff1f2;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-weight: 700;
      font-size: 0.95rem;
      border-radius: 999px;
      color: #fff;
      background: var(--gradient-pop);
      box-shadow: 0 4px 14px rgba(244, 63, 94, 0.35);
      transition: var(--transition);
    }
    .btn-portal:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(244, 63, 94, 0.5);
      color: #fff;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .mobile-menu-btn svg {
      width: 28px;
      height: 28px;
      fill: var(--text-main);
    }

    .hero-section {
      background: radial-gradient(circle at 50% 20%, #ffe4e6 0%, #fafaf9 65%);
      padding: 70px 0 60px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      border-radius: 999px;
      background: #ffffff;
      border: 1px solid #fecdd3;
      color: var(--primary);
      font-weight: 700;
      font-size: 0.88rem;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .hero-badge::before {
      content: "";
      width: 8px;
      height: 8px;
      background-color: var(--primary);
      border-radius: 50%;
      animation: pulseDot 1.5s infinite;
    }
    @keyframes pulseDot {
      0%, 100% { transform: scale(1); opacity: 1; }
      50% { transform: scale(1.6); opacity: 0.4; }
    }
    .hero-title {
      font-size: 2.85rem;
      line-height: 1.25;
      font-weight: 900;
      color: var(--dark);
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-title span {
      background: var(--gradient-pop);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 840px;
      margin: 0 auto 36px;
    }
    .hero-btns {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-hero-main {
      padding: 14px 34px;
      font-size: 1.05rem;
      font-weight: 800;
      border-radius: 999px;
      background: var(--gradient-pop);
      color: #fff;
      box-shadow: 0 8px 24px rgba(244, 63, 94, 0.4);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-hero-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(244, 63, 94, 0.55);
      color: #fff;
    }
    .btn-hero-sub {
      padding: 14px 28px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 999px;
      background: #ffffff;
      color: var(--dark);
      border: 1px solid var(--border-highlight);
      box-shadow: var(--shadow-sm);
    }
    .btn-hero-sub:hover {
      background: #f8fafc;
      border-color: #cbd5e1;
    }
    .hero-feature-tags {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .feature-tag-chip {
      background: rgba(255, 255, 255, 0.85);
      border: 1px solid #fed7aa;
      color: #c2410c;
      font-size: 0.85rem;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: 8px;
      box-shadow: var(--shadow-sm);
    }

    .stats-strip {
      background: #ffffff;
      border-top: 1px solid var(--border-highlight);
      border-bottom: 1px solid var(--border-highlight);
      padding: 30px 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-item h3 {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .stat-item p {
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    .section-wrap {
      padding: 70px 0;
    }
    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--primary);
      background: #ffe4e6;
      padding: 4px 12px;
      border-radius: 6px;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 14px;
    }
    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .custom-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #cbd5e1;
    }
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: #fff1f2;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
      font-weight: bold;
    }
    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 10px;
    }
    .card-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-highlight);
      padding: 8px 16px;
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--dark);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .model-pill:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    .rating-highlight-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 2px solid #fda4af;
      box-shadow: var(--shadow-md);
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }
    .rating-info {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .score-badge {
      background: var(--gradient-pop);
      color: #ffffff;
      font-size: 2.2rem;
      font-weight: 900;
      padding: 10px 24px;
      border-radius: var(--radius-md);
      box-shadow: 0 6px 16px rgba(244, 63, 94, 0.3);
    }
    .rating-meta h4 {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--dark);
    }
    .rating-stars {
      color: #f59e0b;
      font-size: 1.25rem;
      margin: 4px 0;
    }

    .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);
    }
    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }
    .comp-table th, .comp-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .comp-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--dark);
    }
    .comp-table tr:hover td {
      background-color: #fff9fa;
    }
    .highlight-cell {
      background-color: #fff1f2;
      color: var(--primary);
      font-weight: 700;
    }

    .step-list {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      counter-reset: flow-step;
    }
    .step-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #fff;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }

    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
    }
    .faq-question:hover {
      background: #fdf2f4;
    }
    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.2s;
    }
    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }

    .comment-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .comment-text {
      font-size: 0.95rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: italic;
    }
    .comment-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--dark);
    }
    .author-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--dark);
    }
    .author-role {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .form-panel {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      outline: none;
      transition: var(--transition);
      background-color: #fff;
      color: var(--dark);
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(244, 63, 94, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }
    .btn-submit {
      width: 100%;
      padding: 14px;
      font-size: 1rem;
      font-weight: 800;
      color: #fff;
      background: var(--gradient-pop);
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(244, 63, 94, 0.3);
      transition: var(--transition);
    }
    .btn-submit:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(244, 63, 94, 0.45);
    }

    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .media-card-img-wrap {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .media-card-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
    }
    .media-card-body {
      padding: 20px;
    }

    .article-links-box {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .article-link-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px dashed var(--border-color);
    }
    .article-link-item:last-child {
      border-bottom: none;
    }
    .article-link-item a {
      color: var(--dark);
      font-size: 0.95rem;
      font-weight: 600;
    }
    .article-link-item a:hover {
      color: var(--primary);
    }

    .footer-section {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #f8fafc;
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-col p {
      font-size: 0.9rem;
      line-height: 1.7;
      margin-bottom: 10px;
    }
    .footer-links-list li {
      margin-bottom: 10px;
    }
    .footer-links-list a {
      color: #94a3b8;
      font-size: 0.9rem;
    }
    .footer-links-list a:hover {
      color: #ffffff;
    }
    .qr-container {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .qr-container img {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      background: #fff;
      padding: 4px;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.88rem;
    }
    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }
    .friend-links-wrap a {
      color: #64748b;
    }
    .friend-links-wrap a:hover {
      color: #f43f5e;
    }

    .floating-tools {
      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 #e2e8f0;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      cursor: pointer;
      transition: var(--transition);
      font-size: 1.2rem;
      font-weight: 700;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.08);
    }

    @media (max-width: 992px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-2 { grid-template-columns: 1fr; }
      .step-list { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .nav-links { display: none; }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border-highlight);
        box-shadow: var(--shadow-md);
      }
      .mobile-menu-btn { display: block; }
    }
    @media (max-width: 640px) {
      .hero-title { font-size: 2.1rem; }
      .grid-4, .grid-3, .step-list, .stats-grid, .footer-grid { grid-template-columns: 1fr; }
      .rating-highlight-box { flex-direction: column; text-align: center; }
      .rating-info { flex-direction: column; }
    }