:root {
      --c-bg: #f8fafc;
      --c-surface: #ffffff;
      --c-text-primary: #0f172a;
      --c-text-secondary: #475569;
      --c-text-muted: #64748b;
      --c-border: #e2e8f0;
      --c-brand-coral: #ff5e62;
      --c-brand-sun: #ff9966;
      --c-brand-purple: #7f00ff;
      --c-brand-cyan: #00d2ff;
      --c-brand-emerald: #10b981;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 16px 36px rgba(15, 23, 42, 0.12);
      --max-w: 1200px;
    }
    * {
      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(--c-bg);
      color: var(--c-text-primary);
      line-height: 1.65;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 10%, rgba(255, 94, 98, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 90% 20%, rgba(0, 210, 255, 0.04) 0%, transparent 45%),
        radial-gradient(circle at 50% 80%, rgba(127, 0, 255, 0.03) 0%, transparent 50%);
      background-attachment: fixed;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    .container {
      width: 100%;
      max-width: var(--max-w);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--c-border);
      box-shadow: var(--shadow-sm);
    }
    .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: 40px;
      width: auto;
      display: block;
    }
    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, var(--c-brand-coral), var(--c-brand-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--c-text-secondary);
      padding: 8px 10px;
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover {
      color: var(--c-brand-coral);
      background: rgba(255, 94, 98, 0.06);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-primary {
      padding: 8px 18px;
      background: linear-gradient(135deg, var(--c-brand-coral), var(--c-brand-sun));
      color: #fff !important;
      font-weight: 600;
      font-size: 0.9rem;
      border-radius: 30px;
      box-shadow: 0 4px 12px rgba(255, 94, 98, 0.25);
    }
    .btn-nav-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(255, 94, 98, 0.35);
    }
    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .mobile-menu-btn svg {
      width: 28px;
      height: 28px;
      stroke: var(--c-text-primary);
    }
    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: linear-gradient(135deg, rgba(255, 94, 98, 0.1), rgba(127, 0, 255, 0.1));
      border: 1px solid rgba(255, 94, 98, 0.25);
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--c-brand-coral);
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: clamp(2rem, 4.5vw, 3.2rem);
      font-weight: 900;
      line-height: 1.25;
      color: var(--c-text-primary);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-desc {
      font-size: clamp(1.05rem, 2vw, 1.25rem);
      color: var(--c-text-secondary);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.8;
    }
    .hero-btn-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .btn-hero-main {
      padding: 14px 34px;
      background: linear-gradient(135deg, var(--c-brand-coral) 0%, var(--c-brand-sun) 50%, var(--c-brand-purple) 100%);
      color: #fff;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 40px;
      box-shadow: 0 10px 25px rgba(255, 94, 98, 0.35);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-hero-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 30px rgba(255, 94, 98, 0.45);
      color: #fff;
    }
    .btn-hero-outline {
      padding: 14px 30px;
      border: 2px solid var(--c-border);
      background: var(--c-surface);
      color: var(--c-text-primary);
      font-size: 1.05rem;
      font-weight: 600;
      border-radius: 40px;
      box-shadow: var(--shadow-sm);
    }
    .btn-hero-outline:hover {
      border-color: var(--c-brand-coral);
      color: var(--c-brand-coral);
      background: rgba(255, 94, 98, 0.04);
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }
    .metric-card {
      background: var(--c-surface);
      border: 1px solid var(--c-border);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      position: relative;
      overflow: hidden;
      transition: all 0.3s ease;
    }
    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: linear-gradient(90deg, var(--c-brand-coral), var(--c-brand-cyan));
      opacity: 0;
      transition: opacity 0.3s ease;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .metric-card:hover::before {
      opacity: 1;
    }
    .metric-value {
      font-size: 2rem;
      font-weight: 800;
      color: var(--c-text-primary);
      line-height: 1.2;
      margin-bottom: 6px;
    }
    .metric-label {
      font-size: 0.88rem;
      color: var(--c-text-muted);
    }
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }
    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--c-brand-coral);
      background: rgba(255, 94, 98, 0.08);
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--c-text-primary);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 1.02rem;
      color: var(--c-text-secondary);
      line-height: 1.7;
    }
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .feature-card {
      background: var(--c-surface);
      border: 1px solid var(--c-border);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(255, 94, 98, 0.4);
    }
    .feature-icon-box {
      width: 52px;
      height: 52px;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 18px;
      background: linear-gradient(135deg, rgba(255, 94, 98, 0.12), rgba(255, 153, 102, 0.18));
      color: var(--c-brand-coral);
    }
    .feature-card:nth-child(2n) .feature-icon-box {
      background: linear-gradient(135deg, rgba(0, 210, 255, 0.12), rgba(127, 0, 255, 0.15));
      color: var(--c-brand-purple);
    }
    .feature-card:nth-child(3n) .feature-icon-box {
      background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(0, 210, 255, 0.15));
      color: var(--c-brand-emerald);
    }
    .feature-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--c-text-primary);
      margin-bottom: 10px;
    }
    .feature-text {
      font-size: 0.92rem;
      color: var(--c-text-secondary);
      line-height: 1.6;
      flex-grow: 1;
    }
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 30px;
    }
    .media-card {
      background: var(--c-surface);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--c-border);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .media-thumb-box {
      position: relative;
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #e2e8f0;
      overflow: hidden;
    }
    .media-thumb-box.square-ratio {
      aspect-ratio: 4 / 3;
    }
    .media-thumb-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }
    .media-card:hover .media-thumb-box img {
      transform: scale(1.04);
    }
    .media-content {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .media-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--c-text-primary);
      margin-bottom: 8px;
    }
    .media-desc {
      font-size: 0.92rem;
      color: var(--c-text-secondary);
      line-height: 1.6;
    }
    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
      padding: 24px;
      background: var(--c-surface);
      border-radius: var(--radius-md);
      border: 1px solid var(--c-border);
    }
    .model-chip {
      padding: 6px 14px;
      background: #f1f5f9;
      color: var(--c-text-secondary);
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: 20px;
      transition: all 0.2s ease;
      border: 1px solid transparent;
    }
    .model-chip:hover {
      background: #fff;
      border-color: var(--c-brand-coral);
      color: var(--c-brand-coral);
      transform: translateY(-2px);
      box-shadow: var(--shadow-sm);
    }
    .steps-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-item {
      background: var(--c-surface);
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--c-border);
      position: relative;
    }
    .step-number {
      font-size: 1.6rem;
      font-weight: 900;
      color: var(--c-brand-sun);
      margin-bottom: 12px;
      display: inline-block;
    }
    .step-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--c-text-primary);
    }
    .step-desc {
      font-size: 0.88rem;
      color: var(--c-text-secondary);
    }
    .compare-section-box {
      background: var(--c-surface);
      border-radius: var(--radius-lg);
      border: 1px solid var(--c-border);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .compare-score-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--c-border);
      margin-bottom: 28px;
    }
    .score-badge-cluster {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .star-display {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }
    .score-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--c-brand-coral);
      line-height: 1;
    }
    .score-max {
      font-size: 0.95rem;
      color: var(--c-text-muted);
      font-weight: 500;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
    }
    .table-compare {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
      min-width: 650px;
    }
    .table-compare th, 
    .table-compare td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--c-border);
    }
    .table-compare th {
      background: #f8fafc;
      color: var(--c-text-secondary);
      font-weight: 700;
    }
    .table-compare .col-brand {
      background: rgba(255, 94, 98, 0.03);
      font-weight: 700;
      color: var(--c-brand-coral);
    }
    .table-compare td.col-brand {
      color: var(--c-text-primary);
    }
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--c-surface);
      border: 1px solid var(--c-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.25s ease;
    }
    .faq-item:hover {
      border-color: rgba(255, 94, 98, 0.4);
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      color: var(--c-text-primary);
      user-select: none;
    }
    .faq-icon {
      width: 20px;
      height: 20px;
      transition: transform 0.3s ease;
      color: var(--c-brand-coral);
      flex-shrink: 0;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: #fafbfc;
      color: var(--c-text-secondary);
      font-size: 0.93rem;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px 24px;
      border-top: 1px solid var(--c-border);
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: var(--c-surface);
      border: 1px solid var(--c-border);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: transform 0.3s ease;
    }
    .review-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .review-body {
      font-size: 0.92rem;
      color: var(--c-text-secondary);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      padding-top: 16px;
      border-top: 1px solid #f1f5f9;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--c-brand-sun), var(--c-brand-purple));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }
    .author-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--c-text-primary);
    }
    .author-info p {
      font-size: 0.8rem;
      color: var(--c-text-muted);
    }
    .form-panel-wrapper {
      background: var(--c-surface);
      border-radius: var(--radius-lg);
      border: 1px solid var(--c-border);
      box-shadow: var(--shadow-md);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1fr;
    }
    .form-info-side {
      background: linear-gradient(135deg, #0f172a, #1e293b);
      color: #fff;
      padding: 48px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .form-info-side h3 {
      font-size: 1.8rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: #fff;
    }
    .form-info-side p {
      color: #94a3b8;
      font-size: 0.96rem;
      line-height: 1.7;
      margin-bottom: 30px;
    }
    .contact-item-group {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 30px;
    }
    .contact-item-line {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.92rem;
      color: #cbd5e1;
    }
    .qr-container {
      background: #fff;
      padding: 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
      max-width: 140px;
    }
    .qr-container img {
      width: 100%;
      height: auto;
      display: block;
    }
    .form-input-side {
      padding: 48px;
    }
    .form-row {
      margin-bottom: 20px;
    }
    .form-row label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--c-text-primary);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--c-border);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--c-text-primary);
      background: #f8fafc;
      transition: border-color 0.2s ease, background 0.2s ease;
      font-family: inherit;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--c-brand-coral);
      background: #fff;
    }
    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }
    .btn-submit-form {
      width: 100%;
      padding: 14px;
      background: linear-gradient(135deg, var(--c-brand-coral), var(--c-brand-sun));
      color: #fff;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 1rem;
      font-weight: 700;
      cursor: pointer;
      transition: all 0.25s ease;
      box-shadow: 0 4px 14px rgba(255, 94, 98, 0.3);
    }
    .btn-submit-form:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(255, 94, 98, 0.4);
    }
    .site-footer {
      background: #0b1120;
      color: #cbd5e1;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }
    .footer-columns {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #fff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links-list li a {
      color: #94a3b8;
      font-size: 0.88rem;
    }
    .footer-links-list li a:hover {
      color: var(--c-brand-coral);
    }
    .article-links-wrap {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .article-links-wrap a {
      color: #94a3b8;
      font-size: 0.85rem;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      max-width: 100%;
    }
    .article-links-wrap a:hover {
      color: var(--c-brand-coral);
    }
    .footer-bottom-bar {
      padding-top: 24px;
      border-top: 1px solid #1e293b;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.85rem;
      color: #64748b;
    }
    .friend-links-box {
      margin-top: 20px;
      padding-top: 20px;
      border-top: 1px dashed #1e293b;
      font-size: 0.85rem;
    }
    .friend-links-box span {
      color: #64748b;
      margin-right: 12px;
    }
    .friend-links-box a {
      color: #94a3b8;
      margin-right: 14px;
      display: inline-block;
    }
    .friend-links-box a:hover {
      color: var(--c-brand-coral);
    }
    .float-dock {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--c-surface);
      color: var(--c-text-primary);
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      border: 1px solid var(--c-border);
      transition: all 0.25s ease;
      position: relative;
    }
    .float-btn:hover {
      transform: scale(1.08);
      color: var(--c-brand-coral);
    }
    .float-btn.btn-qr:hover .float-qr-popup {
      display: block;
    }
    .float-qr-popup {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #fff;
      padding: 12px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--c-border);
      width: 140px;
      text-align: center;
    }
    .float-qr-popup img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
    }
    .float-qr-popup p {
      font-size: 0.75rem;
      color: var(--c-text-secondary);
      margin-top: 6px;
    }
    @media (max-width: 992px) {
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .card-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .form-panel-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-columns {
        grid-template-columns: 1fr 1fr;
      }
      .media-card-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--c-border);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-metrics {
        grid-template-columns: 1fr;
      }
      .card-grid-3, .card-grid-4 {
        grid-template-columns: 1fr;
      }
      .steps-timeline {
        grid-template-columns: 1fr;
      }
      .reviews-grid {
        grid-template-columns: 1fr;
      }
      .footer-columns {
        grid-template-columns: 1fr;
      }
      .form-info-side, .form-input-side {
        padding: 28px 20px;
      }
    }