/* CSS RESETS & GLOBAL VARIABLES (High Saturation Vivid Light Theme) */
    :root {
      --primary-color: #4f46e5;
      --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
      --vivid-accent: #06b6d4;
      --vivid-pink: #ec4899;
      --vivid-purple: #8b5cf6;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-secondary: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 4px 6px -1px rgba(99, 102, 241, 0.08), 0 2px 4px -2px rgba(99, 102, 241, 0.05);
      --shadow-lg: 0 20px 25px -5px rgba(99, 102, 241, 0.12), 0 8px 10px -6px rgba(99, 102, 241, 0.08);
      --radius-lg: 16px;
      --radius-md: 10px;
      --container-max: 1200px;
    }

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

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

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

    a {
      color: var(--primary-color);
      text-decoration: none;
      transition: all 0.25s ease;
    }
    a:hover {
      color: #3730a3;
    }

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

    /* HEADER & NAVIGATION */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-logo-wrap img.ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }
    .brand-title-sub {
      font-size: 1.1rem;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* Explicit requirement: .nav-links gap set to 0 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li {
      margin: 0;
      padding: 0;
    }
    .nav-links a {
      display: block;
      padding: 8px 14px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      border-radius: 6px;
      transition: all 0.2s ease;
    }
    .nav-links a:hover {
      background-color: rgba(99, 102, 241, 0.08);
      color: var(--primary-color);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-vivid {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 30px;
      background: var(--primary-gradient);
      color: #ffffff !important;
      font-weight: 700;
      font-size: 0.95rem;
      box-shadow: 0 4px 14px rgba(236, 72, 153, 0.35);
      border: none;
      cursor: pointer;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .btn-vivid:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(236, 72, 153, 0.45);
    }
    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      border-radius: 30px;
      border: 2px solid var(--primary-color);
      color: var(--primary-color) !important;
      font-weight: 700;
      font-size: 0.92rem;
      background: transparent;
      transition: all 0.2s ease;
    }
    .btn-outline:hover {
      background: rgba(99, 102, 241, 0.08);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* HERO SECTION (Strict constraint: NO IMAGES inside Hero screen) */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.12) 0%, rgba(236, 72, 153, 0.08) 50%, rgba(255, 255, 255, 0) 80%);
      text-align: center;
      position: relative;
    }
    .hero-badge {
      display: inline-block;
      padding: 6px 18px;
      border-radius: 20px;
      background: rgba(99, 102, 241, 0.1);
      border: 1px solid rgba(99, 102, 241, 0.25);
      color: var(--primary-color);
      font-size: 0.88rem;
      font-weight: 700;
      margin-bottom: 24px;
    }
    /* Strictly single H1 <= 20 chars */
    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .hero-title span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }
    .hero-btns {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
    }
    .hero-features-bar {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      margin-top: 40px;
    }
    .hero-stat-card {
      background: var(--bg-card);
      padding: 24px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease;
    }
    .hero-stat-card:hover {
      transform: translateY(-4px);
      border-color: var(--primary-color);
    }
    .hero-stat-num {
      font-size: 2.2rem;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 6px;
    }
    .hero-stat-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* SECTION TITLE BUILDER */
    .section-block {
      padding: 75px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    }
    .section-block:nth-child(even) {
      background: rgba(241, 245, 249, 0.5);
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }
    .section-tag {
      font-size: 0.82rem;
      font-weight: 800;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: var(--vivid-pink);
      margin-bottom: 8px;
      display: block;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .section-intro {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* GRID & CARD LAYOUTS */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 28px;
    }
    .cards-grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
    }
    .feature-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(99, 102, 241, 0.4);
    }
    .card-icon-badge {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(236, 72, 153, 0.15));
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 800;
      margin-bottom: 20px;
    }
    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .card-desc {
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    /* ABOUT US & MEDIA BLOCK */
    .about-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .media-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .media-card img.ai-page-image {
      width: 100%;
      height: auto;
      display: block;
    }

    /* COMPARISON & REVIEW SECTION */
    .review-score-box {
      background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 36px;
      box-shadow: var(--shadow-lg);
    }
    .score-big {
      font-size: 3.2rem;
      font-weight: 900;
      line-height: 1;
    }
    .stars-tag {
      font-size: 1.4rem;
      color: #fbbf24;
      margin-top: 4px;
    }
    .comparison-table-wrap {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    table.comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    table.comparison-table th,
    table.comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }
    table.comparison-table th {
      background: rgba(99, 102, 241, 0.06);
      font-weight: 700;
      color: var(--text-main);
    }
    table.comparison-table tr:hover {
      background: rgba(241, 245, 249, 0.8);
    }
    .highlight-col {
      background: rgba(99, 102, 241, 0.04);
      font-weight: 700;
      color: var(--primary-color);
    }

    /* MODEL BADGE CLOUD */
    .model-tags-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .tag-badge {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 4px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
    }
    .tag-badge:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      transform: translateY(-2px);
    }

    /* PROCESS STEPS */
    .steps-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 24px;
      position: relative;
    }
    .step-card {
      background: var(--bg-card);
      padding: 26px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .step-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: rgba(99, 102, 241, 0.25);
      position: absolute;
      top: 16px;
      right: 20px;
    }

    /* REVIEWS GRID */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }
    .review-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 26px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 20px;
    }
    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    /* FAQ ACCORDION */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }
    .faq-question {
      width: 100%;
      padding: 20px 24px;
      background: none;
      border: none;
      text-align: left;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .faq-question::after {
      content: '+';
      font-size: 1.4rem;
      color: var(--primary-color);
      transition: transform 0.2s ease;
    }
    .faq-item.active .faq-question::after {
      content: '−';
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.65;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px;
    }

    /* CONTACT & FORM */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .contact-info-box {
      background: var(--bg-card);
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
    }
    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
      margin-bottom: 20px;
    }
    .contact-icon {
      font-size: 1.2rem;
      color: var(--vivid-pink);
    }
    .qr-container {
      margin-top: 24px;
      display: inline-block;
      padding: 12px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }
    .qr-container img {
      max-width: 140px;
      height: auto;
      display: block;
    }

    .form-box {
      background: var(--bg-card);
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .form-input, .form-select, .form-textarea {
      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 ease;
      background: var(--bg-main);
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary-color);
      background: #ffffff;
    }

    /* FOOTER */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 65px 0 30px;
      font-size: 0.9rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 20px;
      font-weight: 700;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #94a3b8;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }
    .friend-links-box a {
      color: #cbd5e1;
      background: rgba(255,255,255,0.06);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.85rem;
    }
    .friend-links-box a:hover {
      background: rgba(255,255,255,0.15);
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
    }

    /* FLOATING CONTACT WIDGET */
    .float-widget {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      font-size: 1.2rem;
      cursor: pointer;
      transition: transform 0.2s ease;
    }
    .float-btn:hover {
      transform: scale(1.1);
    }

    /* RESPONSIVE MEDIA QUERIES */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.2rem; }
      .about-layout, .contact-wrapper { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .mobile-menu-btn { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show { display: flex; }
      .hero-title { font-size: 1.8rem; }
      .footer-grid { grid-template-columns: 1fr; }
      .review-score-box { flex-direction: column; text-align: center; gap: 16px; }
    }