:root {
      --primary: #4338ca;
      --primary-light: #6366f1;
      --accent-coral: #f43f5e;
      --accent-amber: #f59e0b;
      --accent-cyan: #06b6d4;
      --gradient-brand: linear-gradient(135deg, #4f46e5 0%, #ec4899 50%, #f97316 100%);
      --gradient-soft: linear-gradient(135deg, #eff6ff 0%, #faf5ff 50%, #fff7ed 100%);
      --gradient-card: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
      --bg-main: #f8fafc;
      --bg-surface: #ffffff;
      --text-main: #0f172a;
      --text-secondary: #475569;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --border-hover: #cbd5e1;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 12px 28px rgba(79, 70, 229, 0.12);
      --shadow-xl: 0 20px 40px rgba(15, 23, 42, 0.1);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --radius-xl: 24px;
      --container-max: 1240px;
      --transition: all 0.28s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

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

    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      line-height: 1.65;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      box-shadow: 0 2px 10px rgba(15, 23, 42, 0.03);
    }

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

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

    .brand-logo-container {
      max-height: 40px;
      display: flex;
      align-items: center;
    }

    .brand-logo-container .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .brand-title span {
      background: var(--gradient-brand);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.06);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: 9999px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      font-size: 0.95rem;
      line-height: 1.2;
    }

    .btn:hover {
      transform: translateY(-2px);
    }

    .btn-gradient {
      background: var(--gradient-brand);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(244, 63, 94, 0.35);
    }

    .btn-gradient:hover {
      box-shadow: 0 6px 20px rgba(244, 63, 94, 0.5);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary);
      border: 1.5px solid var(--primary-light);
    }

    .btn-outline:hover {
      background: rgba(79, 70, 229, 0.05);
      border-color: var(--primary);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    .hero-section {
      position: relative;
      background: var(--gradient-soft);
      padding: 60px 0 70px 0;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-bg-shape {
      position: absolute;
      border-radius: 50%;
      filter: blur(80px);
      opacity: 0.5;
      pointer-events: none;
      z-index: 1;
    }

    .shape-1 {
      width: 450px;
      height: 450px;
      background: #c7d2fe;
      top: -100px;
      right: -80px;
    }

    .shape-2 {
      width: 380px;
      height: 380px;
      background: #fbcfe8;
      bottom: -60px;
      left: -60px;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      padding: 6px 16px;
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
      border: 1px solid #e0e7ff;
      margin-bottom: 20px;
    }

    .hero-badge .dot {
      width: 8px;
      height: 8px;
      background: var(--accent-coral);
      border-radius: 50%;
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.95); opacity: 0.8; }
      50% { transform: scale(1.3); opacity: 1; }
      100% { transform: scale(0.95); opacity: 0.8; }
    }

    .hero-title {
      font-size: 2.85rem;
      line-height: 1.25;
      font-weight: 850;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.03em;
    }

    .hero-title .gradient-text {
      background: var(--gradient-brand);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 34px;
      font-weight: 400;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 40px;
    }

    .btn-hero-main {
      padding: 14px 34px;
      font-size: 1.1rem;
      letter-spacing: 0.02em;
    }

    .hero-stats-panel {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      margin-top: 10px;
    }

    .stat-item {
      text-align: center;
      border-right: 1px solid var(--border-color);
      padding: 0 10px;
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-number {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
      line-height: 1.1;
    }

    .stat-number.gradient {
      background: var(--gradient-brand);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .section {
      padding: 80px 0;
      position: relative;
    }

    .section-alt {
      background: #f1f5f9;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

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

    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--accent-coral);
      background: rgba(244, 63, 94, 0.08);
      padding: 4px 12px;
      border-radius: 9999px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.02em;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
      align-items: center;
    }

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

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

    .about-card {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .about-feature-list {
      list-style: none;
      display: grid;
      gap: 16px;
      margin-top: 24px;
    }

    .about-feature-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
    }

    .about-feature-icon {
      flex-shrink: 0;
      width: 24px;
      height: 24px;
      background: rgba(79, 70, 229, 0.1);
      color: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.8rem;
      margin-top: 2px;
    }

    .media-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      transition: var(--transition);
    }

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

    .service-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 26px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .service-card:hover {
      border-color: #cbd5e1;
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .service-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 2px 8px;
      border-radius: 4px;
      margin-bottom: 12px;
      align-self: flex-start;
    }

    .badge-coral { background: #ffe4e6; color: #e11d48; }
    .badge-blue { background: #dbeafe; color: #1d4ed8; }
    .badge-amber { background: #fef3c7; color: #b45309; }
    .badge-emerald { background: #d1fae5; color: #047857; }
    .badge-purple { background: #f3e8ff; color: #6b21a8; }

    .service-card h3 {
      font-size: 1.18rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 0.92rem;
      color: var(--text-secondary);
      line-height: 1.55;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .service-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: auto;
    }

    .tag-chip {
      font-size: 0.78rem;
      background: #f1f5f9;
      color: #334155;
      padding: 3px 8px;
      border-radius: 4px;
    }

    .model-pills-wrap {
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      margin-bottom: 40px;
      box-shadow: var(--shadow-sm);
    }

    .model-pills-wrap h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .pill-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .model-pill {
      background: #f8fafc;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #334155;
      transition: var(--transition);
    }

    .model-pill:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .step-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: #e2e8f0;
      line-height: 1;
      margin-bottom: 12px;
      transition: var(--transition);
    }

    .step-card:hover .step-number {
      color: var(--primary-light);
    }

    .step-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 0.9rem;
      color: var(--text-secondary);
    }

    .eval-box {
      background: #ffffff;
      border-radius: var(--radius-xl);
      padding: 36px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
    }

    .eval-highlight-header {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      background: linear-gradient(135deg, #eef2ff 0%, #fff1f2 100%);
      padding: 24px 30px;
      border-radius: var(--radius-md);
      margin-bottom: 30px;
      border: 1px solid #e0e7ff;
    }

    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 18px;
    }

    .big-score {
      font-size: 3.2rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .stars-box {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .star-icons {
      color: #f59e0b;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      margin-top: 10px;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.94rem;
    }

    .compare-table th, 
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

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

    .compare-table tr:hover td {
      background: #fafafa;
    }

    .cell-highlight {
      font-weight: 700;
      color: var(--primary);
      background: rgba(79, 70, 229, 0.03);
    }

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

    .check-no {
      color: #94a3b8;
    }

    .testimonial-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 100%;
    }

    .testimonial-content {
      font-size: 0.94rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 18px;
      position: relative;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, #c7d2fe 0%, #fecdd3 100%);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }

    .author-meta h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.2;
    }

    .author-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
      display: grid;
      gap: 14px;
    }

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

    .faq-item:hover {
      border-color: #cbd5e1;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      padding: 18px 22px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
    }

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 400;
      color: var(--primary);
      transition: transform 0.3s ease;
      flex-shrink: 0;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fafafa;
    }

    .faq-answer-inner {
      padding: 0 22px 20px 22px;
      font-size: 0.94rem;
      color: var(--text-secondary);
      line-height: 1.6;
    }

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

    .form-panel {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius-xl);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
    }

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

    .form-group label {
      display: block;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #f8fafc;
      color: var(--text-main);
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-light);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    }

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

    .article-links-box {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      margin-top: 24px;
    }

    .article-links-box h4 {
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .article-url-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .article-url-chip {
      font-size: 0.85rem;
      background: #f1f5f9;
      color: var(--primary);
      padding: 6px 12px;
      border-radius: 6px;
      border: 1px solid #e2e8f0;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .article-url-chip:hover {
      background: #e2e8f0;
    }

    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px 0;
      color: var(--text-secondary);
      margin-top: auto;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1.2fr 1.2fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-brand p {
      font-size: 0.92rem;
      color: var(--text-muted);
      margin: 14px 0 20px 0;
      line-height: 1.6;
    }

    .footer-heading {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 18px;
    }

    .footer-list {
      list-style: none;
      display: grid;
      gap: 10px;
    }

    .footer-list li a {
      font-size: 0.9rem;
      color: var(--text-secondary);
    }

    .footer-list li a:hover {
      color: var(--primary);
      padding-left: 4px;
    }

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

    .qr-box img {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      padding: 4px;
      background: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      font-size: 0.85rem;
      color: var(--text-muted);
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
    }

    .friend-links-bar {
      margin-bottom: 24px;
      padding-top: 20px;
      border-top: 1px solid var(--border-color);
    }

    .friend-links-bar h5 {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .friend-links-list a {
      font-size: 0.86rem;
      color: var(--text-muted);
    }

    .friend-links-list a:hover {
      color: var(--primary);
    }

    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 990;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(15, 23, 42, 0.15);
      border: 1px solid var(--border-color);
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
    }

    .float-btn:hover {
      transform: translateY(-3px);
      box-shadow: 0 6px 20px rgba(15, 23, 42, 0.2);
    }

    .float-btn.main-contact {
      background: var(--gradient-brand);
      color: #ffffff;
    }

    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-title { font-size: 2.3rem; }
    }

    @media (max-width: 768px) {
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .nav-links li { width: 100%; }
      .nav-links li a { width: 100%; padding: 12px 0; }
      .hero-title { font-size: 1.85rem; }
      .hero-subtitle { font-size: 1rem; }
      .hero-stats-panel { grid-template-columns: repeat(2, 1fr); }
      .stat-item:nth-child(2) { border-right: none; }
      .stat-item:nth-child(3) { border-right: 1px solid var(--border-color); }
      .grid-2, .grid-3 { grid-template-columns: 1fr; }
      .eval-highlight-header { flex-direction: column; text-align: center; }
      .footer-grid { grid-template-columns: 1fr; }
    }