:root {
      --primary-red: #c8161d;
      --primary-crimson: #e60012;
      --dark-red: #8f0e13;
      --light-red-bg: #fff5f5;
      --warm-bg: #fdfbfb;
      --card-bg: #ffffff;
      --border-red: #f8d7da;
      --text-main: #1f2329;
      --text-muted: #5c6370;
      --gold-accent: #d48806;
      --gold-bg: #fffbe6;
      --shadow-sm: 0 2px 8px rgba(200, 22, 29, 0.06);
      --shadow-md: 0 8px 24px rgba(200, 22, 29, 0.1);
      --radius: 8px;
    }

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

    html {
      scroll-behavior: smooth;
    }

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

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      border-bottom: 2px solid var(--primary-red);
      box-shadow: var(--shadow-sm);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

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

    .brand-box .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-red);
      letter-spacing: 0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      transition: color 0.25s, background-color 0.25s;
      border-radius: 4px;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 6px;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-crimson) 0%, var(--primary-red) 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 12px rgba(230, 0, 18, 0.25);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #ff1a2b 0%, var(--dark-red) 100%);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(230, 0, 18, 0.35);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary-red) !important;
      border-color: var(--primary-red);
    }

    .btn-outline:hover {
      background: var(--light-red-bg);
    }

    .btn-gold {
      background: linear-gradient(135deg, #faad14 0%, var(--gold-accent) 100%);
      color: #ffffff !important;
    }

    .btn-gold:hover {
      background: linear-gradient(135deg, #ffc53d 0%, #ad6800 100%);
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary-red);
      cursor: pointer;
      padding: 4px 8px;
    }

    .section {
      padding: 70px 0;
      border-bottom: 1px solid #f0e6e6;
    }

    .section-title-wrap {
      text-align: center;
      margin-bottom: 45px;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary-red);
      background-color: var(--light-red-bg);
      border: 1px solid var(--border-red);
      border-radius: 20px;
      margin-bottom: 10px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 720px;
      margin: 0 auto;
    }

    /* Hero Section - STRICTLY NO IMAGES */
    .hero-section {
      background: radial-gradient(circle at 80% 20%, #ffe8e8 0%, #fffafa 50%, #ffffff 100%);
      padding: 85px 0 70px;
      border-bottom: 2px solid #ffd4d6;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 36px;
      line-height: 1.3;
      color: var(--dark-red);
      margin-bottom: 18px;
      font-weight: 800;
    }

    .hero-lead {
      font-size: 18px;
      color: #3f444e;
      margin-bottom: 24px;
      font-weight: 500;
    }

    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 32px;
    }

    .hero-tag-item {
      font-size: 13px;
      background: #ffffff;
      color: var(--primary-red);
      border: 1px solid var(--border-red);
      padding: 4px 12px;
      border-radius: 4px;
      font-weight: 500;
    }

    .hero-btns {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .hero-visual-card {
      background: #ffffff;
      border: 2px solid var(--border-red);
      border-radius: 12px;
      padding: 30px;
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .visual-top-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
      padding-bottom: 12px;
      border-bottom: 1px solid #f2f2f2;
    }

    .model-matrix-preview {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-bottom: 20px;
    }

    .matrix-item {
      background: var(--light-red-bg);
      border: 1px dashed var(--primary-red);
      padding: 10px 6px;
      text-align: center;
      font-size: 13px;
      font-weight: 600;
      color: var(--dark-red);
      border-radius: 6px;
    }

    .benefit-ticker {
      background: var(--gold-bg);
      border: 1px solid #ffe58f;
      padding: 12px;
      border-radius: 6px;
      font-size: 13px;
      color: #874d00;
      font-weight: 600;
      text-align: center;
    }

    /* Stats bar */
    .stats-bar {
      background: linear-gradient(90deg, #99000a 0%, var(--primary-red) 100%);
      color: #ffffff;
      padding: 30px 0;
    }

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

    .stat-num {
      font-size: 34px;
      font-weight: 800;
      color: #fffae6;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 14px;
      opacity: 0.9;
    }

    /* Grid cards */
    .card-grid {
      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: #ffffff;
      border: 1px solid #eee;
      border-top: 4px solid var(--primary-red);
      border-radius: var(--radius);
      padding: 26px 22px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .card-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 14px;
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
    }

    .card-badge {
      font-size: 12px;
      background: var(--light-red-bg);
      color: var(--primary-red);
      padding: 2px 8px;
      border-radius: 4px;
      font-weight: 600;
    }

    .card-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-footer-info {
      font-size: 13px;
      color: var(--primary-red);
      font-weight: 600;
      border-top: 1px dashed #f0f0f0;
      padding-top: 12px;
    }

    /* Process steps */
    .process-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
    }

    .process-step {
      background: #ffffff;
      border: 1px solid var(--border-red);
      border-radius: 8px;
      padding: 20px 16px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-badge {
      width: 36px;
      height: 36px;
      background: var(--primary-red);
      color: #fff;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 12px;
    }

    .step-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .step-desc {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Comparison section */
    .rating-banner {
      background: linear-gradient(135deg, #fff3e0 0%, #ffebe8 100%);
      border: 2px solid #ffbb96;
      border-radius: 12px;
      padding: 24px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-score-box {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .rating-big-num {
      font-size: 42px;
      font-weight: 800;
      color: var(--primary-red);
    }

    .rating-stars {
      color: #fa8c16;
      font-size: 20px;
      letter-spacing: 2px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: 8px;
      box-shadow: var(--shadow-sm);
      border: 1px solid #eee;
    }

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

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f2f2f2;
      font-size: 14px;
    }

    .compare-table th {
      background-color: var(--light-red-bg);
      color: var(--dark-red);
      font-weight: 700;
    }

    .compare-table tr:hover {
      background-color: #fafafa;
    }

    .highlight-col {
      background-color: #fff8f8;
      font-weight: 600;
      color: var(--primary-red);
    }

    /* Media showcase section */
    .media-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: start;
      margin-bottom: 30px;
    }

    .media-card {
      background: #ffffff;
      border: 1px solid #eee;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .media-card img {
      width: 100%;
      display: block;
      height: auto;
    }

    .media-info {
      padding: 18px;
    }

    .banner-trio {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }

    .banner-trio .ai-page-image {
      border-radius: 6px;
      border: 1px solid #eee;
    }

    /* FAQ accordion */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid #eaeaea;
      border-radius: 6px;
      overflow: hidden;
      transition: border-color 0.25s;
    }

    .faq-item.active {
      border-color: var(--primary-red);
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 16px 20px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      background: none;
      border: none;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-icon {
      font-size: 18px;
      color: var(--primary-red);
      transition: transform 0.25s;
    }

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

    .faq-answer {
      display: none;
      padding: 0 20px 16px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* Testimonials */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .testi-card {
      background: #ffffff;
      border: 1px solid #eee;
      border-radius: 8px;
      padding: 22px;
      box-shadow: var(--shadow-sm);
    }

    .testi-header {
      display: flex;
      justify-content: space-between;
      margin-bottom: 12px;
    }

    .testi-role {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary-red);
    }

    .testi-text {
      font-size: 14px;
      color: #4a4a4a;
      line-height: 1.6;
    }

    /* Article links */
    .article-section {
      background: #ffffff;
    }

    .article-links-box {
      background: var(--warm-bg);
      border: 1px solid #eee;
      border-radius: 8px;
      padding: 20px;
      margin-top: 15px;
    }

    .article-link-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      list-style: none;
    }

    .article-link-list li a {
      color: var(--primary-red);
      text-decoration: underline;
      font-size: 14px;
    }

    /* Form Section */
    .form-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }

    .contact-info-card {
      background: var(--light-red-bg);
      border: 2px solid var(--border-red);
      border-radius: 8px;
      padding: 30px;
    }

    .contact-item {
      margin-bottom: 18px;
      font-size: 15px;
    }

    .contact-item strong {
      color: var(--dark-red);
    }

    .qr-box {
      margin-top: 20px;
      text-align: center;
      background: #ffffff;
      border: 1px solid var(--border-red);
      padding: 16px;
      border-radius: 8px;
      display: inline-block;
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      display: block;
      margin: 0 auto 8px;
    }

    .qr-title {
      font-size: 13px;
      font-weight: 600;
      color: var(--dark-red);
    }

    .custom-form {
      background: #ffffff;
      border: 1px solid #eee;
      border-radius: 8px;
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      font-size: 14px;
      border: 1px solid #d9d9d9;
      border-radius: 6px;
      outline: none;
      transition: border-color 0.25s;
    }

    .form-control:focus {
      border-color: var(--primary-red);
    }

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

    /* Footer */
    .site-footer {
      background: #1a1616;
      color: #d1d1d1;
      padding: 50px 0 25px;
      border-top: 4px solid var(--primary-red);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 35px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      margin-bottom: 16px;
      border-left: 3px solid var(--primary-red);
      padding-left: 10px;
    }

    .footer-col p {
      font-size: 14px;
      line-height: 1.7;
      color: #a0a0a0;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .friend-links a {
      color: #b0b0b0;
      font-size: 13px;
      transition: color 0.25s;
    }

    .friend-links a:hover {
      color: #ff4d4f;
      text-decoration: underline;
    }

    .footer-bottom {
      border-top: 1px solid #2d2626;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: #888888;
    }

    /* Floating contact */
    .floating-service {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary-red);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
      font-size: 12px;
      font-weight: 700;
      text-align: center;
      cursor: pointer;
      transition: transform 0.25s;
    }

    .float-btn:hover {
      transform: scale(1.08);
      background: var(--primary-crimson);
    }

    /* Responsive */
    @media (max-width: 992px) {
      .hero-grid, .form-layout, .media-grid {
        grid-template-columns: 1fr;
      }
      .card-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .nav-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        border-bottom: 2px solid var(--primary-red);
        box-shadow: var(--shadow-md);
        padding: 10px 0;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li a {
        width: 100%;
        padding: 12px 24px;
      }
    }

    @media (max-width: 600px) {
      .card-grid, .card-grid-4, .banner-trio {
        grid-template-columns: 1fr;
      }
      .process-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 26px;
      }
      .section-title {
        font-size: 24px;
      }
    }