:root {
        --bg-dark: #080711;
        --bg-card: rgba(22, 17, 40, 0.75);
        --bg-card-hover: rgba(35, 26, 62, 0.9);
        --primary-pink: #ff2a8d;
        --primary-purple: #9d4edd;
        --accent-cyan: #00f0ff;
        --text-white: #ffffff;
        --text-body: #e2e4f0;
        --text-muted: #9598b5;
        --border-cyber: rgba(255, 42, 141, 0.25);
        --border-cyber-glow: rgba(255, 42, 141, 0.7);
        --gradient-primary: linear-gradient(135deg, #ff2a8d 0%, #9d4edd 100%);
        --gradient-cyan: linear-gradient(135deg, #00f0ff 0%, #ff2a8d 100%);
        --gradient-dark: linear-gradient(180deg, #080711 0%, #120b24 100%);
        --shadow-glow: 0 0 20px rgba(255, 42, 141, 0.35);
        --shadow-cyan: 0 0 20px rgba(0, 240, 255, 0.3);
        --container-width: 1200px;
      }
      
      * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
      }
      
      html {
        scroll-behavior: smooth;
        background-color: var(--bg-dark);
        color: var(--text-body);
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
        line-height: 1.6;
      }
      
      body {
        background: var(--gradient-dark);
        min-height: 100vh;
        overflow-x: hidden;
        position: relative;
      }

      body::before {
        content: "";
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background-image: 
          radial-gradient(circle at 15% 20%, rgba(255, 42, 141, 0.08) 0%, transparent 40%),
          radial-gradient(circle at 85% 80%, rgba(157, 78, 221, 0.1) 0%, transparent 45%),
          radial-gradient(circle at 50% 50%, rgba(0, 240, 255, 0.05) 0%, transparent 50%);
        pointer-events: none;
        z-index: 0;
      }

      .container {
        max-width: var(--container-width);
        margin: 0 auto;
        padding: 0 20px;
        position: relative;
        z-index: 1;
      }

      /* Navigation */
      header {
        position: sticky;
        top: 0;
        z-index: 1000;
        background: rgba(8, 7, 17, 0.85);
        backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border-cyber);
      }
      
      .nav-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 76px;
      }
      
      .brand-box {
        display: flex;
        align-items: center;
        gap: 12px;
      }

      .ai-page-logo {
        height: 42px;
        width: auto;
        object-fit: contain;
      }
      
      .ai-page-home-link {
        color: var(--accent-cyan);
        text-decoration: none;
        font-weight: 600;
        padding: 4px 10px;
        border: 1px solid rgba(0, 240, 255, 0.4);
        border-radius: 4px;
        font-size: 0.85rem;
        transition: all 0.3s;
      }

      .ai-page-home-link:hover {
        background: rgba(0, 240, 255, 0.15);
        box-shadow: var(--shadow-cyan);
      }
      
      .nav-menu {
        display: flex;
        align-items: center;
        gap: 22px;
        list-style: none;
      }
      
      .nav-menu a {
        color: var(--text-body);
        text-decoration: none;
        font-size: 0.95rem;
        font-weight: 500;
        transition: color 0.3s;
      }
      
      .nav-menu a:hover {
        color: var(--primary-pink);
        text-shadow: 0 0 8px rgba(255, 42, 141, 0.5);
      }

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

      .cyber-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 10px 22px;
        font-size: 0.95rem;
        font-weight: 700;
        color: var(--text-white);
        background: var(--gradient-primary);
        border: none;
        border-radius: 6px;
        cursor: pointer;
        text-decoration: none;
        box-shadow: var(--shadow-glow);
        transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
      }

      .cyber-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 0 25px rgba(255, 42, 141, 0.6);
        opacity: 0.95;
      }

      .cyber-btn.outline {
        background: transparent;
        border: 1px solid var(--primary-pink);
        color: var(--primary-pink);
        box-shadow: none;
      }

      .cyber-btn.outline:hover {
        background: rgba(255, 42, 141, 0.15);
        box-shadow: var(--shadow-glow);
      }

      .cyber-btn.glow {
        background: var(--gradient-cyan);
        color: #080711;
        box-shadow: var(--shadow-cyan);
      }

      .cyber-btn.sm {
        padding: 6px 14px;
        font-size: 0.85rem;
      }

      .mobile-menu-btn {
        display: none;
        background: none;
        border: 1px solid var(--border-cyber);
        color: var(--text-white);
        font-size: 1.5rem;
        padding: 4px 8px;
        border-radius: 4px;
        cursor: pointer;
      }

      /* Sections General */
      section {
        padding: 80px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      }

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

      .section-subtitle {
        color: var(--accent-cyan);
        text-transform: uppercase;
        font-size: 0.85rem;
        letter-spacing: 2px;
        font-weight: 700;
        margin-bottom: 8px;
        display: block;
      }

      .section-title {
        font-size: 2.2rem;
        font-weight: 800;
        color: var(--text-white);
        margin-bottom: 16px;
        line-height: 1.3;
      }

      .section-desc {
        color: var(--text-muted);
        font-size: 1rem;
      }

      /* Hero Section (Strictly NO Images) */
      #hero {
        padding: 100px 0 80px 0;
        position: relative;
        background: radial-gradient(circle at 50% 30%, rgba(157, 78, 221, 0.15) 0%, transparent 60%);
      }

      .hero-content {
        text-align: center;
        max-width: 960px;
        margin: 0 auto;
      }

      .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        background: rgba(255, 42, 141, 0.12);
        border: 1px solid var(--primary-pink);
        color: var(--primary-pink);
        padding: 6px 16px;
        border-radius: 30px;
        font-size: 0.88rem;
        font-weight: 600;
        margin-bottom: 24px;
        box-shadow: 0 0 15px rgba(255, 42, 141, 0.2);
      }

      .hero-h1 {
        font-size: 2.6rem;
        font-weight: 900;
        color: var(--text-white);
        margin-bottom: 20px;
        letter-spacing: -0.5px;
        background: linear-gradient(180deg, #ffffff 0%, #d8b4fe 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
      }

      .hero-sub {
        font-size: 1.15rem;
        color: var(--text-muted);
        margin-bottom: 32px;
        line-height: 1.7;
      }

      .hero-tags {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
        margin-bottom: 36px;
      }

      .hero-tag {
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.12);
        padding: 5px 14px;
        border-radius: 20px;
        font-size: 0.88rem;
        color: var(--text-body);
        transition: all 0.3s;
      }

      .hero-tag:hover {
        border-color: var(--accent-cyan);
        color: var(--accent-cyan);
        background: rgba(0, 240, 255, 0.1);
      }

      .hero-cta-group {
        display: flex;
        justify-content: center;
        gap: 16px;
        flex-wrap: wrap;
        margin-bottom: 50px;
      }

      .hero-cta-group .cyber-btn {
        padding: 14px 32px;
        font-size: 1.05rem;
      }

      .hero-stats-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
        margin-top: 40px;
      }

      .stat-card {
        background: var(--bg-card);
        border: 1px solid var(--border-cyber);
        padding: 24px 16px;
        border-radius: 12px;
        text-align: center;
        transition: transform 0.3s, border-color 0.3s;
      }

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

      .stat-val {
        font-size: 2.2rem;
        font-weight: 800;
        color: var(--accent-cyan);
        margin-bottom: 4px;
      }

      .stat-lbl {
        font-size: 0.88rem;
        color: var(--text-muted);
      }

      /* Card Grids */
      .grid-3 {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: 24px;
      }

      .grid-2 {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
        gap: 28px;
      }

      .grid-4 {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        gap: 20px;
      }

      .cyber-card {
        background: var(--bg-card);
        border: 1px solid var(--border-cyber);
        border-radius: 12px;
        padding: 28px;
        position: relative;
        overflow: hidden;
        transition: all 0.3s ease;
      }

      .cyber-card::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 4px;
        height: 100%;
        background: var(--gradient-primary);
        opacity: 0.7;
      }

      .cyber-card:hover {
        background: var(--bg-card-hover);
        transform: translateY(-4px);
        border-color: var(--border-cyber-glow);
        box-shadow: var(--shadow-glow);
      }

      .card-icon {
        font-size: 2.2rem;
        margin-bottom: 16px;
        display: inline-block;
      }

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

      .card-desc {
        color: var(--text-muted);
        font-size: 0.94rem;
        line-height: 1.6;
      }

      /* Model Badges Grid */
      .models-flex {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
        justify-content: center;
      }

      .model-chip {
        background: rgba(22, 17, 40, 0.8);
        border: 1px solid rgba(157, 78, 221, 0.4);
        padding: 10px 18px;
        border-radius: 8px;
        font-size: 0.92rem;
        font-weight: 600;
        color: var(--text-white);
        display: flex;
        align-items: center;
        gap: 8px;
        transition: all 0.3s;
      }

      .model-chip:hover {
        border-color: var(--accent-cyan);
        box-shadow: var(--shadow-cyan);
        transform: scale(1.05);
      }

      .model-dot {
        width: 8px;
        height: 8px;
        border-radius: 50%;
        background: var(--primary-pink);
        box-shadow: 0 0 8px var(--primary-pink);
      }

      /* Comparison Section */
      .rating-banner {
        background: linear-gradient(135deg, rgba(255, 42, 141, 0.15) 0%, rgba(0, 240, 255, 0.15) 100%);
        border: 1px solid var(--primary-pink);
        border-radius: 12px;
        padding: 24px;
        text-align: center;
        margin-bottom: 36px;
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        justify-content: space-around;
        gap: 20px;
      }

      .rating-stars {
        color: #ffb703;
        font-size: 1.8rem;
        letter-spacing: 4px;
      }

      .rating-score {
        font-size: 2.2rem;
        font-weight: 900;
        color: var(--accent-cyan);
      }

      .table-wrapper {
        width: 100%;
        overflow-x: auto;
      }

      .cyber-table {
        width: 100%;
        border-collapse: collapse;
        text-align: left;
        background: var(--bg-card);
        border-radius: 12px;
        overflow: hidden;
        border: 1px solid var(--border-cyber);
      }

      .cyber-table th, .cyber-table td {
        padding: 16px 20px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      }

      .cyber-table th {
        background: rgba(157, 78, 221, 0.2);
        color: var(--text-white);
        font-weight: 700;
        font-size: 0.95rem;
      }

      .cyber-table tr:hover {
        background: rgba(255, 255, 255, 0.03);
      }

      .cyber-table td.highlight {
        color: var(--accent-cyan);
        font-weight: 700;
        background: rgba(0, 240, 255, 0.05);
      }

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

      .faq-item {
        background: var(--bg-card);
        border: 1px solid var(--border-cyber);
        border-radius: 8px;
        overflow: hidden;
        transition: border-color 0.3s;
      }

      .faq-question {
        padding: 18px 24px;
        font-weight: 700;
        color: var(--text-white);
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
        font-size: 1.02rem;
      }

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

      .faq-item.active .faq-question::after {
        content: "-";
        transform: rotate(180deg);
      }

      .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease, padding 0.3s ease;
        background: rgba(0, 0, 0, 0.2);
        color: var(--text-muted);
        font-size: 0.95rem;
        line-height: 1.7;
        padding: 0 24px;
      }

      .faq-item.active .faq-answer {
        max-height: 300px;
        padding: 16px 24px 20px 24px;
      }

      /* Form Styling */
      .form-container {
        max-width: 700px;
        margin: 0 auto;
        background: var(--bg-card);
        border: 1px solid var(--border-cyber);
        border-radius: 12px;
        padding: 36px;
        box-shadow: var(--shadow-glow);
      }

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

      .form-label {
        display: block;
        margin-bottom: 8px;
        color: var(--text-white);
        font-weight: 600;
        font-size: 0.92rem;
      }

      .form-input, .form-select, .form-textarea {
        width: 100%;
        padding: 12px 16px;
        background: rgba(8, 7, 17, 0.8);
        border: 1px solid rgba(255, 255, 255, 0.15);
        border-radius: 6px;
        color: var(--text-white);
        font-size: 0.95rem;
        outline: none;
        transition: border-color 0.3s, box-shadow 0.3s;
      }

      .form-input:focus, .form-select:focus, .form-textarea:focus {
        border-color: var(--primary-pink);
        box-shadow: 0 0 10px rgba(255, 42, 141, 0.4);
      }

      .form-select option {
        background: var(--bg-dark);
        color: var(--text-white);
      }

      /* Image Galleries & Media Display */
      .image-gallery {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 20px;
        margin-top: 30px;
      }

      .gallery-item {
        background: var(--bg-card);
        border: 1px solid var(--border-cyber);
        border-radius: 8px;
        padding: 12px;
        text-align: center;
      }

      .ai-page-image {
        border-radius: 6px;
        width: 100%;
        height: auto;
        display: block;
      }

      /* Testimonials Grid */
      .review-card {
        background: var(--bg-card);
        border: 1px solid var(--border-cyber);
        border-radius: 12px;
        padding: 24px;
        position: relative;
      }

      .review-user {
        display: flex;
        align-items: center;
        gap: 14px;
        margin-bottom: 14px;
      }

      .avatar-placeholder {
        width: 48px;
        height: 48px;
        border-radius: 50%;
        background: var(--gradient-primary);
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 800;
        color: var(--text-white);
        font-size: 1.1rem;
      }

      .user-info .user-name {
        font-weight: 700;
        color: var(--text-white);
      }

      .user-info .user-role {
        font-size: 0.82rem;
        color: var(--accent-cyan);
      }

      /* Links section */
      .article-links-grid, .friend-links-flex {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
        margin-top: 16px;
      }

      .article-link-item, .friend-links-flex a {
        background: rgba(255, 255, 255, 0.04);
        border: 1px solid rgba(255, 255, 255, 0.1);
        color: var(--text-muted);
        padding: 8px 14px;
        border-radius: 6px;
        text-decoration: none;
        font-size: 0.88rem;
        transition: all 0.3s;
      }

      .article-link-item:hover, .friend-links-flex a:hover {
        color: var(--primary-pink);
        border-color: var(--primary-pink);
        background: rgba(255, 42, 141, 0.1);
      }

      /* Footer */
      footer {
        background: #040308;
        border-top: 1px solid var(--border-cyber);
        padding: 60px 0 30px 0;
        color: var(--text-muted);
      }

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

      .footer-col h4 {
        color: var(--text-white);
        font-size: 1.05rem;
        margin-bottom: 20px;
      }

      .footer-links {
        list-style: none;
        display: flex;
        flex-direction: column;
        gap: 10px;
      }

      .footer-links a {
        color: var(--text-muted);
        text-decoration: none;
        font-size: 0.9rem;
        transition: color 0.3s;
      }

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

      .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.08);
        padding-top: 24px;
        text-align: center;
        font-size: 0.88rem;
      }

      /* Floating Widgets */
      .floating-kefu {
        position: fixed;
        right: 24px;
        bottom: 30px;
        z-index: 999;
        display: flex;
        flex-direction: column;
        gap: 12px;
      }

      .kefu-btn {
        width: 54px;
        height: 54px;
        border-radius: 50%;
        background: var(--gradient-primary);
        border: none;
        color: #fff;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: var(--shadow-glow);
        cursor: pointer;
        font-size: 1.3rem;
        text-decoration: none;
        position: relative;
      }

      .kefu-pop {
        position: absolute;
        right: 65px;
        bottom: 0;
        width: 180px;
        background: var(--bg-card);
        border: 1px solid var(--border-cyber);
        border-radius: 8px;
        padding: 12px;
        text-align: center;
        display: none;
        box-shadow: var(--shadow-glow);
      }

      .kefu-btn:hover .kefu-pop {
        display: block;
      }

      .kefu-pop img {
        width: 100%;
        height: auto;
        border-radius: 4px;
      }

      /* Media Queries */
      @media (max-width: 992px) {
        .hero-h1 { font-size: 2.1rem; }
        .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
        .footer-grid { grid-template-columns: 1fr 1fr; }
        .nav-menu { display: none; }
        .mobile-menu-btn { display: block; }
        .nav-menu.active {
          display: flex;
          flex-direction: column;
          position: absolute;
          top: 76px;
          left: 0;
          width: 100%;
          background: #080711;
          padding: 20px;
          border-bottom: 1px solid var(--border-cyber);
        }
      }

      @media (max-width: 600px) {
        .hero-h1 { font-size: 1.7rem; }
        .hero-stats-grid { grid-template-columns: 1fr; }
        .footer-grid { grid-template-columns: 1fr; }
        .section-title { font-size: 1.6rem; }
        .cyber-card { padding: 20px; }
      }