/* Global Reset & Basic Variables (撞色艳色风 - Light Theme High Contrast) */
    :root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --primary: #4f46e5;       /* Electric Indigo */
      --primary-dark: #3730a3;
      --secondary: #ff2a5f;     /* Vibrant Neon Coral */
      --secondary-hover: #e01e50;
      --accent-yellow: #ffb800;  /* Bright Electric Amber */
      --accent-cyan: #06b6d4;    /* Vivid Cyan */
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #cbd5e1;
      --border-bold: #0f172a;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.06);
      --shadow-pop: 4px 4px 0px #0f172a;
      --shadow-pop-hover: 6px 6px 0px #0f172a;
      --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 {
      background-color: var(--bg-main);
      color: var(--text-main);
      overflow-x: hidden;
    }

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

    a:hover {
      color: var(--secondary);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

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

    /* Standardized Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 24px;
      font-size: 15px;
      font-weight: 700;
      border-radius: 8px;
      cursor: pointer;
      border: 2px solid var(--border-bold);
      transition: all 0.2s ease;
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff !important;
      box-shadow: var(--shadow-pop);
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
      transform: translate(-2px, -2px);
      box-shadow: var(--shadow-pop-hover);
    }

    .btn-secondary {
      background-color: var(--secondary);
      color: #ffffff !important;
      box-shadow: var(--shadow-pop);
    }
    .btn-secondary:hover {
      background-color: var(--secondary-hover);
      transform: translate(-2px, -2px);
      box-shadow: var(--shadow-pop-hover);
    }

    .btn-outline {
      background-color: #ffffff;
      color: var(--text-main) !important;
      box-shadow: var(--shadow-pop);
    }
    .btn-outline:hover {
      background-color: var(--bg-alt);
      transform: translate(-2px, -2px);
      box-shadow: var(--shadow-pop-hover);
    }

    /* Section Wrapper */
    .section-padding {
      padding: 60px 0;
      border-bottom: 2px solid #e2e8f0;
    }

    .section-head {
      text-align: center;
      margin-bottom: 40px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background-color: var(--accent-yellow);
      color: var(--border-bold);
      font-weight: 800;
      font-size: 13px;
      border: 2px solid var(--border-bold);
      border-radius: 20px;
      margin-bottom: 12px;
      box-shadow: 2px 2px 0px var(--border-bold);
      text-transform: uppercase;
    }

    .section-title {
      font-size: 28px;
      font-weight: 900;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
      margin-top: 8px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }

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

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

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

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

    .brand-title {
      font-size: 20px;
      font-weight: 900;
      color: var(--text-main);
    }

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0; /* Strictly set gap: 0 as requested */
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      border-radius: 6px;
    }

    .nav-links li a:hover {
      background-color: var(--accent-yellow);
      color: var(--border-bold);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 2px solid var(--border-bold);
      padding: 6px 10px;
      border-radius: 6px;
      cursor: pointer;
      font-weight: bold;
    }

    /* HERO SECTION (No Images Allowed) */
    .hero-section {
      background: linear-gradient(135deg, #e0e7ff 0%, #fae8ff 50%, #fef3c7 100%);
      padding: 70px 0 60px 0;
      border-bottom: 2px solid var(--border-bold);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 2px solid var(--border-bold);
      border-radius: 30px;
      font-weight: 800;
      font-size: 14px;
      color: var(--primary);
      box-shadow: var(--shadow-pop);
      margin-bottom: 20px;
    }

    .hero-h1 {
      font-size: 38px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-h1 span {
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 17px;
      color: var(--text-muted);
      margin-bottom: 30px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 15px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 15px;
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius);
      border: 2px solid var(--border-bold);
      box-shadow: var(--shadow-pop);
    }

    .stat-item {
      text-align: center;
    }
    .stat-value {
      font-size: 24px;
      font-weight: 900;
      color: var(--primary);
    }
    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* Cards Grid System */
    .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .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-card {
      background: var(--bg-card);
      border: 2px solid var(--border-bold);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-pop);
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
    }

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

    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--accent-yellow);
      border: 2px solid var(--border-bold);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 20px;
      margin-bottom: 16px;
    }

    .feature-card h3 {
      font-size: 18px;
      font-weight: 800;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      flex: 1;
      line-height: 1.6;
    }

    /* Scenarios Cloud & Tag styling */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 15px;
    }

    .tag-item {
      background: var(--bg-alt);
      border: 1px solid var(--border-color);
      padding: 6px 12px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
    }

    .tag-item.highlight {
      background: #e0e7ff;
      border-color: var(--primary);
      color: var(--primary-dark);
    }

    /* Comparison Section */
    .comparison-box {
      background: #ffffff;
      border: 2px solid var(--border-bold);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-pop);
      margin-bottom: 30px;
    }

    .score-banner {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #ffffff;
      padding: 24px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 24px;
      border: 2px solid var(--border-bold);
    }

    .score-number {
      font-size: 42px;
      font-weight: 900;
      color: var(--accent-yellow);
    }

    .stars {
      color: #f59e0b;
      font-size: 22px;
      letter-spacing: 2px;
    }

    .compare-table-wrapper {
      overflow-x: auto;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .compare-table th, .compare-table td {
      padding: 14px 16px;
      border-bottom: 1px solid #e2e8f0;
    }

    .compare-table th {
      background: var(--bg-alt);
      font-weight: 800;
      color: var(--text-main);
    }

    .compare-table tr:hover {
      background-color: #f8fafc;
    }

    .badge-check {
      color: #10b981;
      font-weight: bold;
    }

    /* Process Section */
    .process-step {
      position: relative;
      background: #ffffff;
      border: 2px solid var(--border-bold);
      padding: 20px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-pop);
    }

    .step-num {
      position: absolute;
      top: -15px;
      right: 15px;
      background: var(--secondary);
      color: #ffffff;
      font-weight: 900;
      font-size: 16px;
      width: 32px;
      height: 32px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 2px solid var(--border-bold);
    }

    /* Reviews Grid */
    .review-card {
      background: #ffffff;
      border: 2px solid var(--border-bold);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--shadow-pop);
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .user-avatar-text {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--accent-cyan);
      color: #ffffff;
      font-weight: 900;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 2px solid var(--border-bold);
    }

    .user-info h4 {
      font-size: 15px;
      font-weight: 800;
    }

    .user-info p {
      font-size: 12px;
      color: var(--text-light);
    }

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

    .faq-item {
      background: #ffffff;
      border: 2px solid var(--border-bold);
      border-radius: 8px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      width: 100%;
      padding: 16px 20px;
      background: none;
      border: none;
      text-align: left;
      font-size: 16px;
      font-weight: 800;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

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

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

    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    /* Media Library Exhibition Zone */
    .media-card {
      background: #ffffff;
      border: 2px solid var(--border-bold);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-pop);
    }

    .media-img-wrap {
      width: 100%;
      background: #e2e8f0;
      border-bottom: 2px solid var(--border-bold);
    }

    .media-body {
      padding: 16px;
    }

    /* Form Section */
    .form-container {
      background: #ffffff;
      border: 2px solid var(--border-bold);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-pop);
      max-width: 800px;
      margin: 0 auto;
    }

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

    .form-group label {
      display: block;
      font-weight: 700;
      margin-bottom: 6px;
      font-size: 14px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 2px solid var(--border-bold);
      border-radius: 6px;
      font-size: 14px;
      background: var(--bg-main);
      color: var(--text-main);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
    }

    /* Footer Section */
    .site-footer {
      background-color: #0f172a;
      color: #f8fafc;
      padding: 50px 0 20px 0;
      border-top: 2px solid var(--border-bold);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 8px;
    }

    .footer-links a {
      color: #cbd5e1;
      font-size: 14px;
    }

    .footer-links a:hover {
      color: var(--accent-yellow);
    }

    .qr-box {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 8px;
    }

    .qr-box img {
      width: 110px;
      height: 110px;
      border: 2px solid #ffffff;
      border-radius: 8px;
    }

    .friend-links-box {
      padding-top: 20px;
      border-top: 1px solid #334155;
      margin-bottom: 20px;
    }

    .friend-links-box a {
      color: #94a3b8;
      margin-right: 15px;
      font-size: 13px;
      display: inline-block;
    }

    .friend-links-box a:hover {
      color: #ffffff;
    }

    .copyright-bar {
      text-align: center;
      font-size: 13px;
      color: #64748b;
      padding-top: 20px;
      border-top: 1px solid #1e293b;
    }

    /* 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;
      background: var(--primary);
      color: #ffffff;
      border: 2px solid var(--border-bold);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      cursor: pointer;
      box-shadow: var(--shadow-pop);
      font-size: 12px;
    }

    /* Responsive Adjustments */
    @media (max-width: 992px) {
      .grid-4 { 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; }
      .mobile-menu-toggle { display: block; }
      .hero-h1 { font-size: 28px; }
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .hero-stats { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr; }
    }