:root {
      --primary: #ff5722;
      --primary-hover: #f4511e;
      --primary-dark: #d84315;
      --primary-light: #fff3e0;
      --accent: #ff9800;
      --accent-glow: rgba(255, 87, 34, 0.15);
      --dark-text: #212529;
      --body-text: #4a5568;
      --muted-text: #718096;
      --bg-light: #fffbf8;
      --bg-white: #ffffff;
      --bg-card: #ffffff;
      --bg-alt: #fef7f2;
      --border-color: #fbd6c6;
      --border-light: #fbeee6;
      --shadow-sm: 0 2px 8px rgba(255, 87, 34, 0.06);
      --shadow-md: 0 8px 24px rgba(255, 87, 34, 0.1);
      --shadow-lg: 0 16px 36px rgba(255, 87, 34, 0.14);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition: all 0.28s ease;
      --container-width: 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(--bg-light);
      color: var(--body-text);
      line-height: 1.65;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 24px;
    }

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

    ul, ol {
      list-style: none;
    }

    /* Header & Navigation */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

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

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

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

    .brand-name {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

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

    .nav-item {
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--dark-text);
      border-radius: var(--radius-sm);
      transition: var(--transition);
      display: inline-block;
    }

    .nav-item:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }

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

    .btn-header {
      padding: 8px 18px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #ffffff;
      font-weight: 600;
      font-size: 0.9rem;
      border-radius: 30px;
      box-shadow: 0 4px 12px rgba(255, 87, 34, 0.3);
      transition: var(--transition);
    }

    .btn-header:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(255, 87, 34, 0.4);
      color: #fff;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--dark-text);
      cursor: pointer;
    }

    /* Hero Section (No Image Allowed) */
    .hero-section {
      background: linear-gradient(180deg, #fff3e6 0%, #fffbf8 100%);
      padding: 64px 0 56px;
      border-bottom: 1px solid var(--border-light);
      position: relative;
    }

    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(255, 87, 34, 0.1);
      border: 1px solid rgba(255, 87, 34, 0.3);
      border-radius: 30px;
      color: var(--primary-dark);
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.25;
      font-weight: 900;
      color: var(--dark-text);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary);
      background: linear-gradient(135deg, #ff5722 0%, #e64a19 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--body-text);
      max-width: 820px;
      margin-bottom: 32px;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      margin-bottom: 40px;
    }

    .btn-main-hero {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 34px;
      background: linear-gradient(135deg, #ff5722 0%, #ff8c00 100%);
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 40px;
      box-shadow: 0 8px 20px rgba(255, 87, 34, 0.35);
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }

    .btn-main-hero:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 12px 28px rgba(255, 87, 34, 0.45);
      color: #fff;
    }

    .btn-secondary-hero {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 28px;
      background: #ffffff;
      color: var(--primary-dark);
      font-size: 1rem;
      font-weight: 700;
      border-radius: 40px;
      border: 1.5px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .btn-secondary-hero:hover {
      border-color: var(--primary);
      background: var(--primary-light);
      color: var(--primary);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 10px;
    }

    .stat-card {
      background: #ffffff;
      padding: 20px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .stat-num {
      font-size: 1.85rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--muted-text);
      font-weight: 500;
    }

    /* Section Titles & Layout */
    .section-padding {
      padding: 70px 0;
      position: relative;
    }

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

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-light);
      border: 1px solid var(--border-color);
      color: var(--primary);
      font-size: 0.82rem;
      font-weight: 700;
      border-radius: 20px;
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--dark-text);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--muted-text);
      line-height: 1.6;
    }

    /* Model Badges Wall */
    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
      padding: 24px;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px dashed var(--border-color);
    }

    .model-chip {
      display: inline-flex;
      align-items: center;
      padding: 6px 14px;
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--dark-text);
      transition: var(--transition);
    }

    .model-chip:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    /* Grid Layouts */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

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

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

    /* Feature Cards */
    .feature-card {
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .feature-icon-box {
      width: 50px;
      height: 50px;
      border-radius: 12px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      font-weight: 900;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 0.94rem;
      color: var(--body-text);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* Process Flow */
    .process-step-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      transition: var(--transition);
    }

    .process-step-box:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
    }

    .step-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: #ffe0b2;
      line-height: 1;
      margin-bottom: 12px;
    }

    .process-step-box h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 8px;
    }

    .process-step-box p {
      font-size: 0.9rem;
      color: var(--body-text);
    }

    /* Media Gallery & Cases */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .media-img-wrap {
      width: 100%;
      background: #f0f0f0;
      overflow: hidden;
      display: block;
    }

    .media-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }

    .media-card:hover .media-img-wrap img {
      transform: scale(1.03);
    }

    .media-content {
      padding: 20px;
    }

    .media-content h3 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 8px;
    }

    .media-content p {
      font-size: 0.88rem;
      color: var(--muted-text);
    }

    /* Comparison Table Component */
    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

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

    .custom-table th {
      background: var(--primary-light);
      color: var(--dark-text);
      font-weight: 700;
    }

    .custom-table tr:hover td {
      background-color: #fff9f5;
    }

    .highlight-col {
      background-color: rgba(255, 87, 34, 0.04);
      font-weight: 700;
      color: var(--primary-dark);
    }

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: #ff5722;
      color: #fff;
      font-weight: 800;
      border-radius: 20px;
      font-size: 0.95rem;
    }

    /* Testimonial Cards */
    .testimonial-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;
    }

    .testimonial-text {
      font-size: 0.93rem;
      color: var(--body-text);
      line-height: 1.6;
      margin-bottom: 18px;
      position: relative;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed var(--border-light);
      padding-top: 14px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #ff8c00, #ff5722);
      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(--dark-text);
    }

    .author-info span {
      font-size: 0.8rem;
      color: var(--muted-text);
    }

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

    .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;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      color: var(--dark-text);
      user-select: none;
      transition: var(--transition);
    }

    .faq-question:hover {
      color: var(--primary);
      background-color: #fffaf5;
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fffdfb;
      padding: 0 24px;
    }

    .faq-answer p {
      padding: 16px 0 20px;
      font-size: 0.93rem;
      color: var(--body-text);
      line-height: 1.65;
      border-top: 1px dashed var(--border-light);
    }

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

    .faq-item.active .faq-answer {
      max-height: 250px;
    }

    /* Forms */
    .form-container {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1.5px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      background: #fffdfb;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px var(--accent-glow);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    .btn-submit {
      width: 100%;
      padding: 14px 28px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 6px 16px rgba(255, 87, 34, 0.3);
      transition: var(--transition);
    }

    .btn-submit:hover {
      box-shadow: 0 8px 22px rgba(255, 87, 34, 0.45);
      transform: translateY(-2px);
    }

    /* Articles Section */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }

    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
      box-shadow: var(--shadow-sm);
    }

    .article-title {
      font-weight: 600;
      color: var(--dark-text);
      font-size: 0.95rem;
    }

    .article-link {
      font-size: 0.85rem;
      color: var(--primary);
      font-weight: 700;
    }

    /* Footer */
    footer.site-footer {
      background: #1a1615;
      color: #d1d5db;
      padding: 60px 0 24px;
      border-top: 4px solid var(--primary);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.3rem;
      font-weight: 800;
      margin-bottom: 14px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      color: #9ca3af;
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
      position: relative;
      padding-bottom: 8px;
    }

    .footer-col h4::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 0;
      width: 24px;
      height: 2px;
      background: var(--primary);
    }

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

    .footer-links a {
      color: #9ca3af;
      font-size: 0.88rem;
    }

    .footer-links a:hover {
      color: var(--primary);
      padding-left: 4px;
    }

    .footer-qr {
      text-align: center;
      background: #26201e;
      padding: 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .footer-qr img {
      width: 100px;
      height: 100px;
      display: block;
      margin: 0 auto 8px;
      border-radius: 4px;
    }

    .footer-qr span {
      font-size: 0.8rem;
      color: #d1d5db;
    }

    .footer-friend-links {
      padding: 20px 0;
      border-top: 1px solid #2d2624;
      border-bottom: 1px solid #2d2624;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 0.85rem;
    }

    .footer-friend-links span {
      color: #ffffff;
      font-weight: 700;
    }

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

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

    .footer-bottom {
      text-align: center;
      font-size: 0.85rem;
      color: #6b7280;
    }

    /* Floating Contact Widget */
    .floating-widget {
      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: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      box-shadow: 0 4px 14px rgba(255, 87, 34, 0.4);
      cursor: pointer;
      border: none;
      transition: var(--transition);
    }

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

    /* Responsive */
    @media (max-width: 992px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
    }

    @media (max-width: 768px) {
      .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }