/* CSS Reset & Variables - 艳红热烈风 */
    :root {
      --primary: #c62828;
      --primary-dark: #8e0000;
      --primary-light: #d32f2f;
      --primary-gradient: linear-gradient(135deg, #b71c1c 0%, #e53935 50%, #d81b60 100%);
      --accent-gold: #ffb300;
      --bg-page: #fdfbfb;
      --bg-alt: #fff5f5;
      --bg-card: #ffffff;
      --text-main: #1a1a1a;
      --text-muted: #555555;
      --text-light: #777777;
      --border-color: #f1cfcf;
      --border-focus: #e53935;
      --shadow-sm: 0 4px 12px rgba(183, 28, 28, 0.06);
      --shadow-md: 0 8px 24px rgba(183, 28, 28, 0.12);
      --shadow-lg: 0 16px 36px rgba(183, 28, 28, 0.18);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 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, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    /* Standard Shared Container */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--primary-dark);
    }

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 1rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      transition: var(--transition);
      cursor: pointer;
      border: none;
      text-align: center;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 6px 18px rgba(229, 57, 53, 0.35);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(229, 57, 53, 0.45);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary) !important;
      border: 2px solid var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #ffffff !important;
      transform: translateY(-2px);
    }
    .btn-gold {
      background: linear-gradient(135deg, #ffb300 0%, #ff8f00 100%);
      color: #1a1a1a !important;
      box-shadow: 0 4px 14px rgba(255, 179, 0, 0.4);
    }
    .btn-gold:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255, 179, 0, 0.5);
    }

    /* Section Styles */
    section {
      padding: 70px 0;
      position: relative;
    }
    section:nth-child(even) {
      background-color: var(--bg-alt);
    }
    .section-header {
      text-align: center;
      margin-bottom: 45px;
    }
    .section-subtitle {
      color: var(--primary);
      font-size: 0.95rem;
      font-weight: 700;
      letter-spacing: 2px;
      text-transform: uppercase;
      margin-bottom: 8px;
      display: inline-block;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: #1a1a1a;
      line-height: 1.3;
    }
    .section-desc {
      color: var(--text-muted);
      max-width: 720px;
      margin: 12px auto 0;
      font-size: 1.05rem;
    }

    /* Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(211, 47, 47, 0.15);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }
    .brand-title {
      font-size: 1.4rem;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }

    /* Mandatory requirement: .nav-links gap set to 0 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
      gap: 0;
    }
    .nav-links li a {
      padding: 10px 12px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      display: block;
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(229, 57, 53, 0.05);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* Hero Section - STRICTLY NO IMAGES */
    .hero-section {
      background: linear-gradient(135deg, #4a0000 0%, #8e0000 40%, #b71c1c 75%, #d32f2f 100%);
      color: #ffffff;
      padding: 90px 0 80px;
      position: relative;
      overflow: hidden;
    }
    .hero-section::before {
      content: "";
      position: absolute;
      top: -100px;
      right: -100px;
      width: 450px;
      height: 450px;
      background: radial-gradient(circle, rgba(255, 179, 0, 0.25) 0%, rgba(255, 179, 0, 0) 70%);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }
    .hero-badge {
      display: inline-block;
      background: rgba(255, 255, 255, 0.15);
      border: 1px solid rgba(255, 255, 255, 0.3);
      padding: 6px 18px;
      border-radius: 50px;
      font-size: 0.9rem;
      font-weight: 600;
      color: #ffeb3b;
      margin-bottom: 24px;
      backdrop-filter: blur(5px);
    }
    .hero-h1 {
      font-size: 2.6rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      color: #ffffff;
      letter-spacing: -0.5px;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      line-height: 1.7;
      color: rgba(255, 255, 255, 0.92);
      margin-bottom: 36px;
    }
    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .hero-btn-main {
      background: #ffffff;
      color: var(--primary-dark) !important;
      font-size: 1.1rem;
      padding: 14px 34px;
    }
    .hero-btn-main:hover {
      background: #fff8f8;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }
    .hero-stat-card {
      background: rgba(0, 0, 0, 0.25);
      border: 1px solid rgba(255, 255, 255, 0.15);
      padding: 20px 15px;
      border-radius: var(--radius-md);
      backdrop-filter: blur(6px);
    }
    .hero-stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: #ffb300;
      margin-bottom: 4px;
    }
    .hero-stat-label {
      font-size: 0.9rem;
      color: rgba(255, 255, 255, 0.85);
    }

    /* Grid Layouts */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
      align-items: center;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 22px;
    }

    /* General Cards */
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--border-focus);
    }
    .card-icon-header {
      width: 54px;
      height: 54px;
      border-radius: 12px;
      background: var(--bg-alt);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 18px;
      font-weight: 800;
      border: 1px solid rgba(211, 47, 47, 0.2);
    }
    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Models Tag Cloud */
    .tags-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 15px;
    }
    .tag-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--primary-dark);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 600;
      transition: var(--transition);
    }
    .tag-item:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* Media Images */
    .media-card {
      overflow: hidden;
      border-radius: var(--radius-md);
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .media-img-box {
      width: 100%;
      overflow: hidden;
      background: #f0f0f0;
      aspect-ratio: 16/9;
    }
    .media-img-box.square {
      aspect-ratio: 1/1;
    }
    .ai-page-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }
    .media-card:hover .ai-page-image {
      transform: scale(1.04);
    }
    .media-info {
      padding: 20px;
    }

    /* Comparison Table Block */
    .comp-box {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      border: 2px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .comp-header {
      background: var(--primary-gradient);
      color: #ffffff;
      padding: 30px;
      text-align: center;
    }
    .rating-badge {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      background: rgba(0, 0, 0, 0.25);
      padding: 8px 20px;
      border-radius: 30px;
      margin-top: 15px;
    }
    .rating-stars {
      color: #ffb300;
      font-size: 1.2rem;
    }
    .rating-score {
      font-size: 1.4rem;
      font-weight: 900;
      color: #ffffff;
    }

    .comp-table-wrap {
      overflow-x: auto;
    }
    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }
    .comp-table th, .comp-table td {
      padding: 16px 22px;
      border-bottom: 1px solid #feeaea;
      font-size: 0.95rem;
    }
    .comp-table th {
      background: #fff0f0;
      color: var(--primary-dark);
      font-weight: 700;
    }
    .comp-table tr:hover td {
      background: #fffdfd;
    }
    .highlight-cell {
      color: var(--primary-dark);
      font-weight: 700;
      background: #fff8f8;
    }

    /* Timeline / Standard Process */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }
    .step-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 18px;
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary-gradient);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      margin: 0 auto 14px;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-toggle {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.3s;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 0.98rem;
      line-height: 1.7;
      display: none;
      border-top: 1px dashed var(--border-color);
      margin-top: 10px;
      padding-top: 16px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-toggle {
      transform: rotate(45deg);
    }

    /* Testimonials */
    .review-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .review-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .review-avatar {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }
    .review-name {
      font-weight: 700;
      color: var(--text-main);
    }
    .review-role {
      font-size: 0.85rem;
      color: var(--text-light);
    }
    .review-stars {
      color: #ffb300;
      margin-left: auto;
    }

    /* Form & Contact */
    .contact-wrapper {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
    }
    .contact-info-side {
      background: linear-gradient(135deg, #7f0000 0%, #b71c1c 100%);
      color: #ffffff;
      padding: 40px;
    }
    .contact-info-item {
      margin-bottom: 24px;
    }
    .contact-info-label {
      font-size: 0.85rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: rgba(255, 255, 255, 0.7);
      margin-bottom: 4px;
    }
    .contact-info-val {
      font-size: 1.1rem;
      font-weight: 600;
      color: #ffffff;
    }
    .qr-box {
      margin-top: 30px;
      background: #ffffff;
      padding: 16px;
      border-radius: var(--radius-md);
      display: inline-block;
      text-align: center;
      color: var(--text-main);
    }
    .qr-box img {
      width: 140px;
      height: 140px;
      display: block;
      margin-bottom: 8px;
    }

    .form-side {
      padding: 40px;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-weight: 600;
      margin-bottom: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #d1d5db;
      border-radius: var(--radius-sm);
      font-size: 0.98rem;
      transition: var(--transition);
      background: #fafafa;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(229, 57, 53, 0.15);
      background: #ffffff;
    }

    /* Articles Section */
    .article-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      transition: var(--transition);
    }
    .article-card:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
      box-shadow: var(--shadow-sm);
    }
    .article-tag {
      font-size: 0.8rem;
      color: var(--primary);
      font-weight: 700;
      margin-bottom: 6px;
    }
    .article-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
      line-height: 1.4;
    }

    /* Footer */
    .site-footer {
      background: #1a0505;
      color: #d1d5db;
      padding: 60px 0 30px;
      border-top: 3px solid var(--primary);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 20px;
      position: relative;
    }
    .footer-col h4::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: -6px;
      width: 30px;
      height: 2px;
      background: var(--primary);
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #b3b3b3;
      font-size: 0.92rem;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .friend-links-wrap a {
      color: #9e9e9e;
      font-size: 0.88rem;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
    }
    .friend-links-wrap a:hover {
      color: #ffffff;
      background: var(--primary);
    }
    .copyright-bar {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      text-align: center;
      font-size: 0.88rem;
      color: #888888;
    }

    /* Fixed Floating Widget */
    .float-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
      cursor: pointer;
      font-weight: 700;
      font-size: 0.85rem;
      transition: var(--transition);
      border: none;
    }
    .float-btn:hover {
      transform: scale(1.1);
    }

    /* Responsive Adjustments */
    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-steps {
        grid-template-columns: repeat(3, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-h1 {
        font-size: 1.9rem;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .process-steps {
        grid-template-columns: 1fr;
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
    }