/* CSS Standard Reset & Colors (High Saturation Vibrant Style - 高饱和艳彩风) */
    :root {
      --primary: #5200FF;
      --primary-gradient: linear-gradient(135deg, #7000FF 0%, #FF007A 100%);
      --accent-orange: #FF5E00;
      --accent-cyan: #00E5FF;
      --accent-pink: #FF006B;
      --bg-main: #FAFBFE;
      --bg-card: #FFFFFF;
      --bg-alt: #F0F3FA;
      --text-main: #111827;
      --text-muted: #4B5563;
      --text-light: #6B7280;
      --border-color: #E5E7EB;
      --shadow-sm: 0 2px 8px rgba(82, 0, 255, 0.06);
      --shadow-md: 0 10px 25px rgba(82, 0, 255, 0.12);
      --shadow-lg: 0 20px 40px rgba(112, 0, 255, 0.18);
      --radius: 12px;
      --max-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      width: 100%;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.2s ease;
    }

    a:hover {
      color: var(--accent-pink);
    }

    /* Container Utility */
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* Header & Navigation */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid rgba(82, 0, 255, 0.1);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    }

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

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

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    .brand-name {
      font-size: 1.4rem;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

    /* Requirement explicitly sets .nav-links gap to 0 */
    .nav-links {
      display: flex;
      gap: 0;
      align-items: center;
      list-style: none;
    }

    .nav-links li {
      margin: 0 4px;
    }

    .nav-links a {
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 10px;
      border-radius: 6px;
      white-space: nowrap;
    }

    .nav-links a:hover {
      background: rgba(112, 0, 255, 0.08);
      color: var(--primary);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: 30px;
      cursor: pointer;
      border: none;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      text-decoration: none;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #FFFFFF !important;
      box-shadow: 0 4px 15px rgba(112, 0, 255, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(255, 0, 122, 0.45);
    }

    .btn-secondary {
      background: #EFE8FF;
      color: var(--primary);
      border: 1px solid rgba(82, 0, 255, 0.2);
    }

    .btn-secondary:hover {
      background: var(--primary);
      color: #FFFFFF;
    }

    .btn-orange {
      background: linear-gradient(135deg, #FF5E00 0%, #FF2E00 100%);
      color: #FFFFFF !important;
      box-shadow: 0 4px 15px rgba(255, 94, 0, 0.3);
    }

    .btn-orange:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(255, 94, 0, 0.5);
    }

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

    /* Section Styling */
    section {
      padding: 70px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }

    .badge-tag {
      display: inline-block;
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 700;
      background: rgba(112, 0, 255, 0.1);
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 12px;
      border: 1px solid rgba(112, 0, 255, 0.2);
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-title span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* Hero Section (No images in Hero per rule) */
    .hero-section {
      padding: 80px 0 90px 0;
      background: radial-gradient(circle at 50% 10%, rgba(112, 0, 255, 0.15) 0%, rgba(255, 0, 122, 0.05) 50%, rgba(250, 251, 254, 1) 100%);
      text-align: center;
    }

    .hero-content {
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 20px;
      background: #FFFFFF;
      border: 2px solid var(--accent-orange);
      border-radius: 30px;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--accent-orange);
      box-shadow: 0 4px 15px rgba(255, 94, 0, 0.15);
      margin-bottom: 24px;
    }

    .hero-h1 {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.2;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-h1 span {
      background: linear-gradient(135deg, #7000FF 0%, #FF006B 50%, #FF5E00 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.18rem;
      color: var(--text-muted);
      margin-bottom: 35px;
      line-height: 1.7;
    }

    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .hero-features-list {
      display: flex;
      justify-content: center;
      gap: 24px;
      flex-wrap: wrap;
      font-weight: 700;
      color: var(--text-main);
      font-size: 0.95rem;
    }

    .hero-features-list span {
      display: flex;
      align-items: center;
      gap: 6px;
      background: #FFFFFF;
      padding: 8px 16px;
      border-radius: 20px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    /* Stats Grid */
    .stats-section {
      background: #FFFFFF;
      padding: 40px 0;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

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

    .stat-card {
      padding: 20px;
      background: var(--bg-main);
      border-radius: var(--radius);
      border: 1px solid rgba(82, 0, 255, 0.08);
      transition: transform 0.3s ease;
    }

    .stat-card:hover {
      transform: translateY(-5px);
    }

    .stat-number {
      font-size: 2.2rem;
      font-weight: 900;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-label {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* Cards & Grid Styling */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

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

    .card {
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 28px;
      border: 1px solid rgba(82, 0, 255, 0.1);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .card-icon {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(112, 0, 255, 0.1) 0%, rgba(255, 0, 122, 0.1) 100%);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 20px;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-tag {
      display: inline-block;
      align-self: flex-start;
      margin-top: 14px;
      padding: 4px 10px;
      border-radius: 6px;
      font-size: 0.78rem;
      font-weight: 700;
      background: #F3E8FF;
      color: var(--primary);
    }

    /* Model Tag Cloud */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-chip {
      background: #FFFFFF;
      border: 1px solid rgba(82, 0, 255, 0.15);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-main);
      box-shadow: 0 2px 5px rgba(0,0,0,0.03);
      transition: all 0.2s ease;
    }

    .model-chip:hover {
      background: var(--primary-gradient);
      color: #FFFFFF;
      border-color: transparent;
      transform: scale(1.05);
    }

    /* Comparison Table (Rating 9.9 / 10, 5 Stars) */
    .rating-box {
      background: linear-gradient(135deg, #111827 0%, #2A085C 100%);
      color: #FFFFFF;
      padding: 30px;
      border-radius: var(--radius);
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-score {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-num {
      font-size: 3.5rem;
      font-weight: 900;
      color: #FFD700;
      line-height: 1;
    }

    .stars {
      color: #FFD700;
      font-size: 1.4rem;
    }

    .table-wrapper {
      width: 100%;
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    th, td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    th {
      background: #F9FAFB;
      font-weight: 800;
      color: var(--text-main);
    }

    td.highlight-cell {
      background: rgba(112, 0, 255, 0.04);
      font-weight: 700;
      color: var(--primary);
    }

    /* Step Timeline */
    .step-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #FFFFFF;
      padding: 24px;
      border-radius: var(--radius);
      border-top: 4px solid var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      font-size: 2rem;
      font-weight: 900;
      color: rgba(112, 0, 255, 0.3);
      margin-bottom: 8px;
    }

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

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      transition: border-color 0.3s ease;
    }

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

    .faq-header {
      padding: 20px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      color: var(--text-main);
    }

    .faq-header::after {
      content: "+";
      font-size: 1.4rem;
      font-weight: 400;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

    .faq-item.active .faq-header::after {
      content: "−";
    }

    .faq-body {
      padding: 0 24px 20px 24px;
      display: none;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

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

    /* Image Gallery & Showcase */
    .media-container {
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      margin-top: 20px;
    }

    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    /* Article List */
    .article-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .article-item {
      background: #FFFFFF;
      padding: 16px 20px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .article-item a {
      font-weight: 700;
      color: var(--text-main);
    }

    .article-item a:hover {
      color: var(--primary);
    }

    /* Form Design */
    .form-wrapper {
      background: #FFFFFF;
      padding: 36px;
      border-radius: var(--radius);
      border: 2px solid rgba(112, 0, 255, 0.15);
      box-shadow: var(--shadow-lg);
    }

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

    .form-label {
      display: block;
      font-weight: 700;
      margin-bottom: 8px;
      font-size: 0.95rem;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(112, 0, 255, 0.15);
    }

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

    /* Contact Info Cards */
    .contact-box {
      background: linear-gradient(135deg, #F5F0FF 0%, #FFF0F6 100%);
      padding: 30px;
      border-radius: var(--radius);
      border: 1px solid rgba(82, 0, 255, 0.1);
    }

    .qr-card {
      text-align: center;
      background: #FFFFFF;
      padding: 20px;
      border-radius: var(--radius);
      display: inline-block;
      box-shadow: var(--shadow-sm);
    }

    .qr-card img {
      width: 150px;
      height: 150px;
      object-fit: contain;
      border-radius: 8px;
    }

    /* Footer Design */
    .footer {
      background: #0B0F19;
      color: #9CA3AF;
      padding: 60px 0 30px 0;
      font-size: 0.9rem;
      border-top: 4px 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;
      margin-bottom: 20px;
      font-weight: 700;
    }

    .footer-col ul {
      list-style: none;
    }

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

    .footer-col a {
      color: #9CA3AF;
    }

    .footer-col a:hover {
      color: #FFFFFF;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 15px;
    }

    .friend-links a {
      background: #1F2937;
      color: #D1D5DB;
      padding: 4px 12px;
      border-radius: 4px;
      font-size: 0.85rem;
    }

    .friend-links a:hover {
      background: var(--primary);
      color: #FFFFFF;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 30px;
      border-top: 1px solid #1F2937;
      color: #6B7280;
    }

    /* Floating Widget */
    .floating-widget {
      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 20px rgba(112, 0, 255, 0.4);
      cursor: pointer;
      font-size: 1.2rem;
      border: none;
      transition: transform 0.3s;
    }

    .float-btn:hover {
      transform: scale(1.1);
    }

    /* Mobile Responsive */
    @media (max-width: 992px) {
      .grid-4, .stats-grid, .step-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 2px solid var(--primary);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
        margin: 6px 0;
      }
      .mobile-toggle {
        display: block;
      }
      .hero-h1 {
        font-size: 2rem;
      }
      .grid-4, .grid-3, .grid-2, .stats-grid, .step-timeline, .article-list {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }