:root {
      --primary-color: #f95738;
      --primary-hover: #e04728;
      --accent-color: #ff9f1c;
      --dark-text: #1d2d44;
      --muted-text: #505a69;
      --light-bg: #fffaf7;
      --card-bg: #ffffff;
      --border-color: #ffe3d8;
      --shadow-sm: 0 4px 12px rgba(249, 87, 56, 0.08);
      --shadow-lg: 0 12px 32px rgba(249, 87, 56, 0.14);
      --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, sans-serif;
      background-color: var(--light-bg);
      color: var(--dark-text);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
    }

    a {
      color: var(--primary-color);
      text-decoration: none;
      transition: color 0.3s ease;
    }

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

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

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      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: 76px;
    }

    .brand-area {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .nav-menu {
      display: flex;
      align-items: center;
    }

    /* Required gap override for .nav-links */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li {
      margin: 0 10px;
    }

    .nav-links a {
      color: var(--dark-text);
      font-weight: 500;
      font-size: 15px;
      padding: 8px 12px;
      border-radius: 6px;
      transition: all 0.25s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-color);
      background-color: rgba(249, 87, 56, 0.08);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: 2px solid transparent;
      transition: all 0.3s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      color: #ffffff !important;
      box-shadow: 0 4px 15px rgba(249, 87, 56, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(249, 87, 56, 0.4);
    }

    .btn-outline {
      border-color: var(--primary-color);
      color: var(--primary-color) !important;
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--primary-color);
      color: #ffffff !important;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--dark-text);
      cursor: pointer;
    }

    /* Section Styling */
    section {
      padding: 80px 0;
      position: relative;
    }

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

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(249, 87, 56, 0.1);
      color: var(--primary-color);
      font-size: 13px;
      font-weight: 700;
      border-radius: 20px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--dark-text);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 16px;
      color: var(--muted-text);
    }

    /* Hero Section - STRICT NO IMAGES */
    .hero-section {
      padding: 100px 0 80px 0;
      background: radial-gradient(circle at 80% 20%, rgba(255, 159, 28, 0.15) 0%, rgba(249, 87, 56, 0.05) 50%, transparent 80%), #fffaf7;
      text-align: center;
      border-bottom: 1px solid var(--border-color);
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 30px;
      font-size: 14px;
      color: var(--primary-color);
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    /* Mandatory H1 Derived from prompt, <= 20 chars */
    .hero-title {
      font-size: 44px;
      font-weight: 900;
      color: var(--dark-text);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--muted-text);
      margin-bottom: 36px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .stat-card {
      text-align: center;
    }

    .stat-num {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary-color);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 13px;
      color: var(--muted-text);
    }

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

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

    .card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
    }

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

    .card-icon {
      width: 50px;
      height: 50px;
      background: rgba(249, 87, 56, 0.1);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      color: var(--primary-color);
      margin-bottom: 18px;
      font-weight: bold;
    }

    .card-title {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--dark-text);
    }

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

    /* Comparison Table & Rating */
    .eval-highlight {
      background: linear-gradient(135deg, #fffaf7, #fff0eb);
      border: 2px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      text-align: center;
      margin-bottom: 30px;
    }

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 15px;
      font-size: 24px;
      font-weight: 800;
      color: var(--dark-text);
    }

    .score-num {
      font-size: 40px;
      color: var(--primary-color);
    }

    .stars {
      color: #ff9f1c;
      font-size: 22px;
    }

    .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: 700px;
    }

    th, td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    th {
      background-color: #fff3ed;
      color: var(--dark-text);
      font-weight: 700;
    }

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

    .highlight-cell {
      background-color: rgba(249, 87, 56, 0.05);
      color: var(--primary-color);
      font-weight: 700;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      margin-bottom: 14px;
      overflow: hidden;
      transition: border-color 0.3s ease;
    }

    .faq-question {
      width: 100%;
      padding: 20px 24px;
      background: none;
      border: none;
      text-align: left;
      font-size: 17px;
      font-weight: 700;
      color: var(--dark-text);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-question:hover {
      color: var(--primary-color);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, padding 0.35s ease;
      padding: 0 24px;
      color: var(--muted-text);
      font-size: 15px;
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px 24px;
    }

    .faq-icon {
      font-size: 20px;
      transition: transform 0.3s ease;
      color: var(--primary-color);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* Testimonials */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }

    .avatar-circle {
      width: 44px;
      height: 44px;
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    .user-name {
      font-weight: 700;
      font-size: 15px;
      color: var(--dark-text);
    }

    .user-role {
      font-size: 12px;
      color: var(--muted-text);
    }

    /* Form Section */
    .form-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-lg);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

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

    label {
      font-size: 14px;
      font-weight: 600;
      color: var(--dark-text);
    }

    input, select, textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      background-color: var(--light-bg);
      color: var(--dark-text);
      outline: none;
      transition: border-color 0.3s ease;
    }

    input:focus, select:focus, textarea:focus {
      border-color: var(--primary-color);
      background-color: #ffffff;
    }

    /* Footer & Friendship Links */
    footer {
      background-color: #1a1c20;
      color: #e0e0e0;
      padding: 60px 0 30px 0;
      font-size: 14px;
    }

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

    .footer-title {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 18px;
    }

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

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

    .footer-links a {
      color: #a0a5b1;
    }

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

    .friendship-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }

    .friendship-links a {
      color: #a0a5b1;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 13px;
    }

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

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      text-align: center;
      color: #7a808d;
    }

    /* Floating CS Button */
    .floating-cs {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 30px;
      padding: 10px 18px;
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      gap: 10px;
      cursor: pointer;
    }

    .floating-cs img {
      width: 32px;
      height: 32px;
      border-radius: 50%;
    }

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

    @media (max-width: 768px) {
      .hero-title {
        font-size: 32px;
      }
      .grid-3, .grid-4, .hero-stats, .footer-grid, .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        display: none;
        box-shadow: var(--shadow-lg);
      }
      .nav-menu.active {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-links li {
        margin: 8px 0;
        width: 100%;
      }
      .header-cta {
        display: none;
      }
    }