/* CSS RESET & VARIABLES */
    :root {
      --primary-grad: linear-gradient(135deg, #ff4e50 0%, #f9d423 50%, #00c6ff 100%);
      --rainbow-accent: linear-gradient(90deg, #ec4899, #8b5cf6, #3b82f6, #10b981, #f59e0b);
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 6px 20px rgba(0,0,0,0.06);
      --shadow-lg: 0 12px 32px rgba(0,0,0,0.1);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-max: 1200px;
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-family);
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    ul, ol {
      list-style: none;
    }

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

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

    /* RAINBOW DECORATION BAR */
    .rainbow-top-bar {
      height: 4px;
      background: var(--rainbow-accent);
      width: 100%;
      position: fixed;
      top: 0;
      left: 0;
      z-index: 1001;
    }

    /* HEADER & NAV */
    .header {
      position: sticky;
      top: 4px;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      z-index: 1000;
      transition: all 0.3s ease;
    }

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

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

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      background: linear-gradient(90deg, #2563eb, #7c3aed);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

    /* Explicit Gap set to 0 as mandated by requirement */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      margin: 0;
      padding: 0;
    }

    .nav-links li {
      display: inline-block;
    }

    .nav-links a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-muted);
      border-radius: 6px;
      transition: all 0.2s ease;
    }

    .nav-links a:hover {
      color: #2563eb;
      background: rgba(37, 99, 235, 0.06);
    }

    .nav-cta-btn {
      background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
      color: #ffffff !important;
      padding: 9px 20px !important;
      border-radius: 30px !important;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
    }

    .nav-cta-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
      padding: 5px;
    }

    /* SECTION TITLE STYLE */
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 5px 16px;
      border-radius: 20px;
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      background: rgba(124, 58, 237, 0.1);
      color: #7c3aed;
      border: 1px solid rgba(124, 58, 237, 0.2);
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
      line-height: 1.3;
      margin-bottom: 14px;
    }

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

    /* HERO SECTION (NO IMAGES ALLOWED) */
    .hero-section {
      padding: 90px 0 70px 0;
      background: radial-gradient(circle at 50% 20%, rgba(244, 240, 255, 0.8) 0%, rgba(248, 250, 252, 1) 70%);
      position: relative;
      overflow: hidden;
    }

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

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 30px;
      background: #fff;
      box-shadow: 0 4px 15px rgba(0,0,0,0.05);
      border: 1px solid #e2e8f0;
      font-size: 0.9rem;
      font-weight: 600;
      color: #2563eb;
      margin-bottom: 24px;
    }

    .hero-tag-sparkle {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 10px #10b981;
    }

    h1.hero-h1 {
      font-size: 2.5rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      color: #0f172a;
      letter-spacing: -0.8px;
    }

    h1.hero-h1 span {
      background: linear-gradient(90deg, #ec4899, #8b5cf6, #3b82f6);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtext {
      font-size: 1.2rem;
      color: #475569;
      margin-bottom: 36px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: 12px;
      font-size: 1.05rem;
      font-weight: 700;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      cursor: pointer;
      border: none;
      text-decoration: none;
    }

    .btn-primary {
      background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
      color: #ffffff;
      box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-3px);
      box-shadow: 0 14px 30px rgba(37, 99, 235, 0.4);
    }

    .btn-secondary {
      background: #ffffff;
      color: #0f172a;
      border: 1px solid #cbd5e1;
      box-shadow: var(--shadow-sm);
    }

    .btn-secondary:hover {
      background: #f8fafc;
      border-color: #94a3b8;
      transform: translateY(-3px);
    }

    .hero-highlights {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .hero-stat-card {
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(226, 232, 240, 0.8);
      border-radius: var(--radius-md);
      padding: 22px 18px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.3s ease;
    }

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

    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      background: linear-gradient(90deg, #2563eb, #ec4899);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* GENERAL SECTION STYLING */
    section {
      padding: 80px 0;
    }

    .bg-white { background-color: #ffffff; }
    .bg-alt { background-color: #f8fafc; }

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

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .feature-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: var(--rainbow-accent);
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-color: transparent;
    }

    .feature-card:hover::before {
      opacity: 1;
    }

    .icon-box {
      width: 54px;
      height: 54px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1));
      color: #2563eb;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .feature-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

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

    /* SCENARIOS BADGES / TAG CLOUD */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-badge {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 600;
      color: #334155;
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
    }

    .model-badge:hover {
      border-color: #8b5cf6;
      color: #7c3aed;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(124, 58, 237, 0.15);
    }

    /* COMPARISON EVALUATION RATING BLOCK */
    .rating-header-card {
      background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 30px;
      margin-bottom: 40px;
      box-shadow: var(--shadow-lg);
    }

    .rating-info-left h3 {
      font-size: 1.8rem;
      font-weight: 800;
      margin-bottom: 10px;
      color: #ffffff;
    }

    .rating-info-left p {
      color: #94a3b8;
      font-size: 1rem;
    }

    .rating-score-box {
      display: flex;
      align-items: center;
      gap: 20px;
      background: rgba(255, 255, 255, 0.08);
      padding: 20px 30px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.12);
    }

    .score-big {
      font-size: 3.2rem;
      font-weight: 900;
      color: #f59e0b;
      line-height: 1;
    }

    .score-sub {
      font-size: 1rem;
      color: #cbd5e1;
    }

    .stars-line {
      color: #f59e0b;
      font-size: 1.2rem;
      margin-bottom: 4px;
    }

    .comparison-table-wrapper {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 700px;
    }

    .comp-table th, .comp-table td {
      padding: 18px 24px;
      border-bottom: 1px solid #f1f5f9;
    }

    .comp-table th {
      background: #f8fafc;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .comp-table tr:last-child td {
      border-bottom: none;
    }

    .comp-table td.highlight-cell {
      background: rgba(37, 99, 235, 0.03);
      font-weight: 700;
      color: #2563eb;
    }

    .check-icon {
      color: #10b981;
      font-weight: 800;
    }

    .cross-icon {
      color: #ef4444;
    }

    /* PROCESS STEP BLOCK */
    .process-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }

    .process-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
      position: relative;
    }

    .process-step-num {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #ec4899, #8b5cf6);
      color: #ffffff;
      font-weight: 800;
      font-size: 1.2rem;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px auto;
    }

    /* REVIEWS BLOCK */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.98rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.7;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 14px;
      border-top: 1px solid #f1f5f9;
      padding-top: 16px;
    }

    .avatar-placeholder {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: linear-gradient(135deg, #3b82f6, #10b981);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
    }

    .author-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .author-role {
      font-size: 0.82rem;
      color: var(--text-light);
    }

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

    .faq-item.active {
      border-color: #8b5cf6;
    }

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

    .faq-toggle-icon {
      font-size: 1.3rem;
      transition: transform 0.3s ease;
      color: #64748b;
    }

    .faq-item.active .faq-toggle-icon {
      transform: rotate(180deg);
      color: #7c3aed;
    }

    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      color: var(--text-muted);
      font-size: 0.96rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      padding: 0 24px 20px 24px;
      max-height: 300px;
    }

    /* FORM STYLES */
    .form-container-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 850px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .form-group.full-width {
      grid-column: span 2;
    }

    .form-label {
      font-weight: 700;
      font-size: 0.9rem;
      color: var(--text-main);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid #cbd5e1;
      font-family: inherit;
      font-size: 0.95rem;
      color: var(--text-main);
      background-color: #f8fafc;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      outline: none;
      border-color: #3b82f6;
      box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
      background-color: #ffffff;
    }

    .form-textarea {
      resize: vertical;
      min-height: 110px;
    }

    .form-submit-btn {
      width: 100%;
      padding: 15px;
      font-size: 1.05rem;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
    }

    .form-submit-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
    }

    /* ARTICLES LIST */
    .article-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    .article-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: all 0.3s ease;
    }

    .article-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #3b82f6;
    }

    .article-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .article-link {
      color: #2563eb;
      font-size: 0.9rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* PROMOTION / BANNER IMAGES SECTION */
    .banner-images-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 16px;
      margin-top: 40px;
    }

    .banner-img-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    .banner-img-item img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .banner-img-item:hover img {
      transform: scale(1.05);
    }

    /* FOOTER */
    .footer {
      background-color: #0f172a;
      color: #cbd5e1;
      padding: 70px 0 30px 0;
      font-size: 0.92rem;
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 50px;
    }

    .footer-brand h4 {
      font-size: 1.4rem;
      font-weight: 800;
      color: #ffffff;
      margin-bottom: 14px;
    }

    .footer-brand p {
      color: #94a3b8;
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .footer-col h5 {
      font-size: 1rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
    }

    .footer-links-list {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links-list a {
      color: #94a3b8;
      transition: color 0.2s ease;
    }

    .footer-links-list a:hover {
      color: #38bdf8;
    }

    .qr-card {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 16px;
      text-align: center;
    }

    .qr-card img {
      width: 120px;
      height: 120px;
      margin: 0 auto 10px auto;
      border-radius: 8px;
    }

    .qr-label {
      font-size: 0.85rem;
      color: #e2e8f0;
      font-weight: 600;
    }

    .friend-links-box {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .friend-links-title {
      font-weight: 700;
      color: #f8fafc;
      font-size: 0.9rem;
    }

    .friend-links-box a {
      color: #94a3b8;
      font-size: 0.88rem;
    }

    .friend-links-box a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      text-align: center;
      color: #64748b;
      font-size: 0.85rem;
    }

    /* FLOATING CONTACT WIDGET */
    .float-contact {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: linear-gradient(135deg, #2563eb, #7c3aed);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 20px rgba(0,0,0,0.2);
      cursor: pointer;
      transition: all 0.3s ease;
      font-size: 1.2rem;
      border: none;
      position: relative;
    }

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

    .float-qr-popup {
      position: absolute;
      right: 64px;
      bottom: 0;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 14px;
      box-shadow: var(--shadow-lg);
      display: none;
      width: 160px;
      text-align: center;
    }

    .float-btn:hover .float-qr-popup {
      display: block;
    }

    .float-qr-popup img {
      width: 100%;
      border-radius: 6px;
      margin-bottom: 6px;
    }

    .float-qr-popup p {
      font-size: 0.78rem;
      color: var(--text-main);
      font-weight: 700;
    }

    /* RESPONSIVE DESIGN */
    @media (max-width: 992px) {
      .footer-top-grid {
        grid-template-columns: 1fr 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
    }

    @media (max-width: 768px) {
      h1.hero-h1 {
        font-size: 1.8rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links a {
        display: block;
        padding: 12px;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .rating-header-card {
        flex-direction: column;
        align-items: flex-start;
      }
    }