:root {
      /* VIBRANT INDIGO & SLATE */
      --bg-body: #f1f5f9;
      --bg-elevated: #ffffff;
      --bg-soft: #e2e8f0;
      --bg-chip: rgba(99, 102, 241, 0.1);
      --accent: #6366f1;
      --accent-soft: rgba(99, 102, 241, 0.12);
      --accent-strong: #4f46e5;
      --accent-secondary: #10b981;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-subtle: rgba(100, 116, 139, 0.3);
      --radius-lg: 18px;
      --radius-xl: 26px;
      --shadow-soft: 0 20px 60px rgba(15, 23, 42, 0.12);
      --shadow-chip: 0 6px 20px rgba(15, 23, 42, 0.08);
      --container-width: 1160px;
      --transition-fast: 160ms ease-out;
      --transition-normal: 220ms ease;
    }

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

    html, body {
      height: 100%;
    }

    body {
      font-family: "Montserrat", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
      background: var(--bg-body);
      color: var(--text-main);
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

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

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

    .page-shell {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

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

    .pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 16px;
      border-radius: 999px;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.08));
      border: 1px solid rgba(99, 102, 241, 0.2);
      color: var(--accent);
      font-size: 11px;
      font-weight: 600;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .pill-dot {
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: radial-gradient(circle at 30% 20%, var(--accent), var(--accent-strong));
      box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.25);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 22px;
      border-radius: 999px;
      border: 1px solid transparent;
      font-size: 14px;
      font-weight: 600;
      letter-spacing: 0.02em;
      cursor: pointer;
      transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
      box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4), 0 0 0 0 rgba(99, 102, 241, 0.4);
      color: #fff;
      position: relative;
      overflow: hidden;
    }

    .btn-primary::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
      transition: left 0.5s ease;
    }

    .btn-primary:hover::before {
      left: 100%;
    }

    .btn-primary:hover {
      transform: translateY(-2px) scale(1.02);
      box-shadow: 0 14px 36px rgba(99, 102, 241, 0.5);
    }

    .btn-secondary {
      background: transparent;
      border-color: rgba(148, 163, 184, 0.7);
      color: var(--text-main);
    }

    .btn-secondary:hover {
      background: var(--bg-soft);
      border-color: var(--accent);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
    }

    .chip-inline {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 12px;
      border-radius: 999px;
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      font-size: 12px;
      color: var(--text-muted);
    }

    .chip-inline strong {
      color: var(--accent);
      font-weight: 600;
    }

    .badge-soft {
      display: inline-block;
      padding: 4px 10px;
      font-size: 11px;
      border-radius: 999px;
      border: 1px solid var(--border-subtle);
      color: var(--text-muted);
      background: var(--bg-elevated);
      letter-spacing: 0.06em;
      text-transform: uppercase;
    }

    .badge-soft-accent {
      border-color: rgba(99, 102, 241, 0.3);
      color: var(--accent-strong);
      background: var(--accent-soft);
    }

    .pill-list {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .pill-list > span {
      font-size: 12px;
      padding: 6px 12px;
      border-radius: 999px;
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      color: var(--text-muted);
    }

    .pill-list strong {
      color: var(--accent-secondary);
      font-weight: 600;
    }

    /* Header */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 40;
      backdrop-filter: blur(16px);
      background: rgba(241, 245, 249, 0.95);
      border-bottom: 1px solid var(--border-subtle);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 14px 20px;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .logo-badge {
      width: 32px;
      height: 32px;
      border-radius: 8px;
      object-fit: contain;
    }

    .logo-text-main {
      font-weight: 600;
      font-size: 15px;
      color: var(--text-main);
    }

    .logo-text-sub {
      font-size: 11px;
      color: var(--text-muted);
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .nav-right {
      display: flex;
      align-items: center;
      gap: 18px;
    }

    .nav-lang {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      color: var(--text-muted);
    }

    .nav-lang a {
      padding: 3px 8px;
      border-radius: 999px;
      border: 1px solid transparent;
    }

    .nav-lang a.active {
      border-color: var(--border-subtle);
      background: var(--bg-elevated);
      color: var(--accent);
      cursor: default;
    }

    .nav-lang a:not(.active):hover {
      border-color: var(--accent);
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 18px;
      font-size: 13px;
      color: var(--text-muted);
      margin-right: 58px;
    }

    .nav-links a {
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: -3px;
      width: 0;
      height: 2px;
      border-radius: 999px;
      background: linear-gradient(90deg, var(--accent-strong), var(--accent-secondary));
      transition: width var(--transition-normal);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-toggle {
      display: none;
      width: 32px;
      height: 32px;
      border-radius: 999px;
      border: 1px solid var(--border-subtle);
      background: var(--bg-elevated);
      color: var(--text-main);
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }

    /* Hero */
    .hero {
      padding: 70px 0 50px;
      position: relative;
      overflow: hidden;
      background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 50%, #f1f5f9 100%);
    }

    .hero::before {
      content: '';
      position: absolute;
      top: -50%;
      right: -20%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }

    .hero::after {
      content: '';
      position: absolute;
      bottom: -30%;
      left: -10%;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(16, 185, 129, 0.06) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 1;
    }

    .hero-heading {
      margin-top: 18px;
      font-size: clamp(32px, 4.5vw, 48px);
      line-height: 1.1;
      font-weight: 800;
      letter-spacing: -0.02em;
    }

    .hero-heading span {
      background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #6366f1 100%);
      background-size: 200% auto;
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      animation: shimmer 3s ease-in-out infinite;
    }

    @keyframes shimmer {
      0%, 100% { background-position: 0% center; }
      50% { background-position: 100% center; }
    }

    .hero-subtitle {
      margin-top: 16px;
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-muted);
      max-width: 520px;
    }

    .hero-subtitle strong {
      color: var(--text-main);
      font-weight: 600;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 9px 14px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.7);
      border: 1px solid rgba(99, 102, 241, 0.18);
      color: var(--text-muted);
      font-size: 13px;
      font-weight: 600;
      letter-spacing: 0.01em;
      backdrop-filter: blur(10px);
      box-shadow: 0 6px 18px rgba(15, 23, 42, 0.06);
      max-width: 100%;
    }

    .hero-badge-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 26px;
      height: 26px;
      border-radius: 999px;
      background: rgba(99, 102, 241, 0.12);
      color: var(--accent);
      flex-shrink: 0;
      font-size: 14px;
      line-height: 1;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 24px;
      align-items: center;
    }

    .hero-meta-row {
      margin-top: 18px;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      align-items: center;
    }

    .hero-meta-row small {
      font-size: 11px;
      color: var(--text-muted);
    }

    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 14px;
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    .hero-tag svg {
      color: var(--accent);
      flex-shrink: 0;
    }

    @media (max-width: 520px) {
      .hero-badge {
        font-size: 12px;
        padding: 8px 12px;
      }

      .hero-badge-icon {
        width: 24px;
        height: 24px;
        font-size: 13px;
      }
    }

    .hero-showcase {
      position: relative;
    }

    .hero-card {
      position: relative;
      padding: 22px 22px 20px;
      border-radius: var(--radius-xl);
      background: var(--bg-elevated);
      box-shadow: var(--shadow-soft);
      border: 1px solid var(--border-subtle);
      overflow: hidden;
    }

    .hero-avatar-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 16px;
    }

    .hero-avatar-main {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .avatar-circle {
      width: 36px;
      height: 36px;
      border-radius: 999px;
      background: radial-gradient(circle at 30% 20%, var(--accent), var(--accent-strong));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      color: #fff;
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
    }

    .avatar-text-main {
      font-size: 13px;
      font-weight: 600;
    }

    .avatar-text-sub {
      font-size: 11px;
      color: var(--text-muted);
    }

    .hero-avatar-stats {
      display: flex;
      flex-direction: column;
      align-items: flex-end;
      gap: 2px;
    }

    .hero-avatar-stats span {
      font-size: 11px;
      color: var(--text-muted);
    }

    .hero-avatar-stats strong {
      font-size: 14px;
      color: var(--accent);
    }

    .hero-dialogue {
      margin-top: 6px;
      display: grid;
      gap: 8px;
      font-size: 12px;
    }

    .bubble-row {
      display: flex;
      gap: 8px;
      align-items: flex-end;
    }

    .bubble {
      max-width: 85%;
      padding: 9px 11px;
      border-radius: 16px;
      font-size: 12px;
      line-height: 1.5;
      border: 1px solid var(--border-subtle);
      background: var(--bg-soft);
      color: var(--text-main);
    }

    .bubble-user {
      margin-left: auto;
      border-bottom-right-radius: 4px;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(79, 70, 229, 0.15));
      border-color: rgba(99, 102, 241, 0.3);
    }

    .bubble-bot {
      border-bottom-left-radius: 4px;
    }

    .bubble-meta {
      display: flex;
      justify-content: space-between;
      margin-top: 4px;
      font-size: 10px;
      color: var(--text-muted);
    }

    .hero-cta-tag {
      margin-top: 14px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 10px;
      border-radius: 999px;
      background: var(--bg-soft);
      border: 1px dashed rgba(99, 102, 241, 0.4);
      font-size: 10px;
      color: var(--text-muted);
    }

    .hero-floating-card {
      position: absolute;
      bottom: -18px;
      right: -10px;
      padding: 10px 12px;
      border-radius: 14px;
      background: var(--bg-elevated);
      border: 1px solid rgba(99, 102, 241, 0.3);
      box-shadow: var(--shadow-soft);
      font-size: 11px;
      display: flex;
      flex-direction: column;
      gap: 4px;
      max-width: 210px;
    }

    .hero-floating-card strong {
      font-size: 11px;
      color: var(--accent);
    }

    .hero-floating-card span {
      font-size: 10px;
      color: var(--text-muted);
    }

    /* Stats */
    .stats {
      margin-top: 50px;
      padding: 0;
      position: relative;
      z-index: 2;
    }

    .stats-grid {
      display: flex;
      justify-content: center;
      gap: 40px;
      flex-wrap: wrap;
    }

    .stat-card {
      text-align: center;
      padding: 0 20px;
      border-left: 2px solid var(--border-subtle);
    }

    .stat-card:first-child {
      border-left: none;
    }

    .stat-value {
      font-size: 36px;
      font-weight: 800;
      background: linear-gradient(135deg, #6366f1, #8b5cf6);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      line-height: 1;
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 12px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Sections */
    .section {
      padding: 56px 0 32px;
    }

    .section-header {
      display: flex;
      justify-content: space-between;
      align-items: flex-end;
      gap: 18px;
      margin-bottom: 30px;
    }

    .section-title-block h2 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 4px;
    }

    .section-title-block p {
      font-size: 14px;
      color: var(--text-muted);
      max-width: 460px;
    }

    /* Use Cases Section */
    .use-cases-section {
      padding: 60px 0 50px;
      background: var(--bg-body);
      margin-top: 40px;
    }

    /* Why AI Tutor */
    .benefits-section {
      padding: 50px 0 40px;
      background: linear-gradient(180deg, var(--bg-soft) 0%, rgba(99, 102, 241, 0.04) 50%, var(--bg-body) 100%);
    }

    .benefits-header {
      text-align: center;
      margin-bottom: 32px;
    }

    .benefits-header h2 {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .benefits-header p {
      font-size: 14px;
      color: var(--text-muted);
      max-width: 520px;
      margin: 0 auto;
    }

    .benefits-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 20px;
    }

    .benefit-card {
      padding: 24px 20px;
      border-radius: var(--radius-lg);
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      text-align: center;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .benefit-card:hover {
      border-color: rgba(99, 102, 241, 0.4);
      box-shadow: 0 8px 32px rgba(15, 23, 42, 0.1);
    }

    .benefit-icon {
      width: 48px;
      height: 48px;
      margin: 0 auto 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 12px;
      background: rgba(99, 102, 241, 0.1);
      font-size: 24px;
    }

    .benefit-icon svg {
      width: 26px;
      height: 26px;
      stroke: var(--accent);
      fill: none;
      stroke-width: 2;
      stroke-linecap: round;
      stroke-linejoin: round;
    }

    .benefit-title {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .benefit-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.55;
    }

    @media (max-width: 960px) {
      .benefits-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
    }

    @media (max-width: 600px) {
      .benefits-grid {
        grid-template-columns: minmax(0, 1fr);
      }
    }

    /* Science-Backed Section */
    .science-section {
      padding: 60px 0 50px;
      background: linear-gradient(180deg, rgba(99, 102, 241, 0) 0%, rgba(99, 102, 241, 0.04) 30%, rgba(99, 102, 241, 0.04) 70%, rgba(99, 102, 241, 0) 100%);
    }

    .science-header {
      text-align: center;
      margin-bottom: 40px;
    }

    .science-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 14px;
      border-radius: 999px;
      background: var(--accent-soft);
      border: 1px solid rgba(99, 102, 241, 0.3);
      font-size: 11px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--accent);
      margin-bottom: 16px;
    }

    .science-badge svg {
      width: 14px;
      height: 14px;
      stroke: var(--accent);
      fill: none;
      stroke-width: 2;
    }

    .science-header h2 {
      font-size: 28px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 12px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }

    .science-header p {
      font-size: 15px;
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto;
    }

    /* Hero Stats */
    .science-stats {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 24px;
      margin-bottom: 50px;
    }

    .science-stat-card {
      padding: 28px 24px;
      border-radius: var(--radius-xl);
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .science-stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 60%;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--accent), transparent);
    }

    .science-stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent);
      line-height: 1;
      margin-bottom: 10px;
      font-variant-numeric: tabular-nums;
    }

    .science-stat-label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .science-stat-desc {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .science-stat-source {
      margin-top: 12px;
      font-size: 10px;
      color: var(--text-muted);
      font-style: italic;
    }

    /* Advantages Grid */
    .science-advantages {
      margin-bottom: 50px;
    }

    .science-advantages h3 {
      font-size: 20px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 24px;
    }

    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(5, minmax(0, 1fr));
      gap: 16px;
    }

    .advantage-card {
      padding: 20px 16px;
      border-radius: var(--radius-lg);
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      text-align: center;
      transition: border-color 0.2s ease, transform 0.2s ease;
    }

    .advantage-card:hover {
      border-color: rgba(99, 102, 241, 0.4);
      transform: translateY(-2px);
    }

    .advantage-icon {
      width: 44px;
      height: 44px;
      margin: 0 auto 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      background: rgba(99, 102, 241, 0.1);
    }

    .advantage-icon svg {
      width: 22px;
      height: 22px;
      stroke: var(--accent);
      fill: none;
      stroke-width: 2;
      stroke-linecap: round;
      stroke-linejoin: round;
    }

    .advantage-title {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .advantage-desc {
      font-size: 11px;
      color: var(--text-muted);
      line-height: 1.45;
    }

    /* Skills Section */
    .science-skills {
      margin-bottom: 40px;
    }

    .science-skills h3 {
      font-size: 20px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 24px;
    }

    .skills-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 20px;
    }

    .skill-card {
      padding: 24px 20px;
      border-radius: var(--radius-lg);
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
    }

    .skill-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .skill-icon {
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      background: rgba(99, 102, 241, 0.1);
      flex-shrink: 0;
    }

    .skill-icon svg {
      width: 20px;
      height: 20px;
      stroke: var(--accent);
      fill: none;
      stroke-width: 2;
    }

    .skill-title {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
    }

    .skill-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .skill-list li {
      position: relative;
      padding-left: 18px;
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 6px;
    }

    .skill-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 7px;
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--accent);
    }

    /* CTA */
    .science-cta {
      text-align: center;
      margin-bottom: 24px;
    }

    .science-cta .btn {
      font-size: 15px;
      padding: 14px 32px;
    }

    .science-disclaimer {
      text-align: center;
      max-width: 640px;
      margin: 0 auto;
      padding: 16px 20px;
      border-radius: var(--radius-lg);
      background: rgba(148, 163, 184, 0.05);
      border: 1px solid rgba(148, 163, 184, 0.1);
    }

    .science-disclaimer p {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .science-disclaimer strong {
      color: var(--text-main);
    }

    .science-metaphor {
      margin-top: 12px;
      font-size: 11px;
      font-style: italic;
      color: rgba(148, 163, 184, 0.7);
    }

    @media (max-width: 1024px) {
      .advantages-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
      }
    }

    @media (max-width: 768px) {
      .science-stats {
        grid-template-columns: minmax(0, 1fr);
        gap: 16px;
      }
      .science-stat-number {
        font-size: 40px;
      }
      .advantages-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
      .skills-grid {
        grid-template-columns: minmax(0, 1fr);
      }
    }

    @media (max-width: 480px) {
      .advantages-grid {
        grid-template-columns: minmax(0, 1fr);
      }
    }

    /* Features */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 26px;
    }

    .feature-tile {
      position: relative;
      border-radius: var(--radius-lg);
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      box-shadow: var(--shadow-soft);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transform-style: preserve-3d;
      transition: transform 200ms ease-out, box-shadow 200ms ease-out, border-color 200ms ease-out;
      will-change: transform;
      cursor: pointer;
    }

    .feature-tile:hover {
      box-shadow: 0 16px 48px rgba(15, 23, 42, 0.12);
      border-color: rgba(99, 102, 241, 0.4);
    }

    .feature-icon-ring {
      width: 100%;
      flex-shrink: 0;
      transition: transform 200ms ease-out;
      will-change: transform;
      transform-origin: center center;
    }

    .feature-icon-img {
      width: 103%;
      height: 320px;
      object-fit: cover;
      object-position: top center;
      display: block;
      margin-left: -1.5%;
    }

    .feature-text {
      padding: 20px 18px 22px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      min-height: 170px;
    }

    .feature-title {
      font-size: 15px;
      font-weight: 600;
    }

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

    .feature-footer {
      margin-top: auto;
      font-size: 11px;
      color: var(--text-muted);
    }

    .feature-tagline {
      font-size: 11px;
      color: var(--accent-secondary);
    }

    /* Split sections */
    .split {
      display: grid;
      grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.1fr);
      gap: 24px;
      align-items: flex-start;
    }

    .card-elevated {
      padding: 18px 18px 20px;
      border-radius: var(--radius-lg);
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      box-shadow: var(--shadow-soft);
    }

    .card-elevated h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .card-elevated p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    .timeline {
      margin-top: 4px;
      display: grid;
      gap: 10px;
    }

    .timeline-item {
      display: grid;
      grid-template-columns: auto minmax(0, 1fr);
      align-items: flex-start;
      gap: 10px;
    }

    .timeline-badge {
      width: 22px;
      height: 22px;
      border-radius: 999px;
      border: 1px solid var(--border-subtle);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 11px;
      color: var(--accent);
      background: var(--bg-soft);
    }

    .timeline-body strong {
      font-size: 13px;
    }

    .timeline-body p {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 2px;
    }

    /* Pricing */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 20px;
    }

    .pricing-card {
      padding: 18px 18px 20px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-subtle);
      background: var(--bg-elevated);
      box-shadow: var(--shadow-soft);
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .pricing-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 14px;
    }

    .pricing-name {
      font-size: 15px;
      font-weight: 600;
    }

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

    .pricing-list {
      margin-top: 4px;
      list-style: none;
      padding-left: 0;
      display: grid;
      gap: 6px;
      font-size: 13px;
      color: var(--text-muted);
    }

    .pricing-list li {
      position: relative;
      padding-left: 16px;
    }

    .pricing-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 7px;
      width: 6px;
      height: 6px;
      border-radius: 999px;
      background: var(--accent-secondary);
    }

    /* Comparison Section */
    .comparison-section {
      padding: 56px 0 32px;
    }

    .comparison-inner {
      background: var(--bg-elevated);
      border-radius: var(--radius-xl);
      border: 1px solid var(--border-subtle);
      box-shadow: var(--shadow-soft);
      padding: 32px 28px 28px;
    }

    .comparison-heading {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: -0.025em;
      margin: 0 0 20px;
      line-height: 1.25;
      text-align: center;
      color: var(--text-main);
    }

    .compare-block {
      margin-top: 8px;
      margin-bottom: 0;
      padding: 0;
      position: relative;
    }

    .compare-title {
      font-size: 14px;
      font-weight: 600;
      margin: 0 0 6px;
      color: var(--text-main);
    }

    .compare-note {
      margin: 0 0 24px;
      font-size: 13px;
      line-height: 1.7;
      color: var(--text-muted);
      max-width: 720px;
    }

    .compare-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 20px;
      margin-bottom: 8px;
      align-items: stretch;
    }

    .compare-col {
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-subtle);
      padding: 24px 22px 22px;
      background: var(--bg-soft);
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .compare-col-label {
      font-size: 11px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      margin-bottom: 2px;
    }

    .compare-cost {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .compare-cost-main {
      font-size: 42px;
      font-weight: 800;
      letter-spacing: -0.03em;
      line-height: 1;
    }

    .compare-cost-unit {
      font-size: 12px;
      color: var(--text-muted);
    }

    .compare-cost-note {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    .compare-col:first-child {
      border-color: rgba(16, 185, 129, 0.5);
      background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0, var(--bg-soft) 50%);
    }

    .compare-col:first-child .compare-col-label {
      color: #10b981;
    }

    .compare-col:first-child .compare-cost-main {
      color: #10b981;
    }

    .compare-col:last-child {
      border-color: rgba(239, 68, 68, 0.3);
      background: linear-gradient(135deg, rgba(239, 68, 68, 0.06) 0, var(--bg-soft) 50%);
    }

    .compare-col:last-child .compare-col-label {
      color: #dc2626;
    }

    .compare-col:last-child .compare-cost-main {
      color: #dc2626;
    }

    .compare-col:last-child .compare-detail-item--positive .compare-detail-icon {
      background: rgba(239, 68, 68, 0.1);
      color: #dc2626;
    }

    .compare-col:last-child .compare-detail-label {
      color: #ef4444;
    }

    .compare-detail {
      margin: 0;
      padding: 0;
      list-style: none;
      font-size: 12px;
      line-height: 1.7;
      color: var(--text-muted);
    }

    .compare-detail-item {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      margin-bottom: 10px;
    }

    .compare-detail-content {
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .compare-detail-icon {
      width: 18px;
      height: 18px;
      min-width: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 11px;
      line-height: 1;
      margin-top: 1px;
      border-radius: 50%;
    }

    .compare-detail-item--positive .compare-detail-icon {
      background: rgba(99, 102, 241, 0.15);
      color: var(--accent);
    }

    .compare-detail-item--positive .compare-detail-icon::before {
      content: "✓";
      font-weight: 700;
    }

    .compare-detail-item--negative .compare-detail-icon {
      background: rgba(148, 163, 184, 0.15);
      color: var(--text-muted);
    }

    .compare-detail-item--negative .compare-detail-icon::before {
      content: "!";
      font-weight: 700;
    }

    .compare-detail-label {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      line-height: 1.4;
    }

    .compare-detail-text {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.55;
    }

    .compare-footnote {
      margin: 20px 0 0;
      padding: 12px 14px;
      font-size: 11px;
      line-height: 1.6;
      color: var(--text-muted);
      background: var(--bg-soft);
      border-radius: 10px;
      border: 1px solid var(--border-subtle);
    }

    .compare-footnote strong {
      color: var(--accent);
    }

    .compare-section {
      margin-top: 14px;
    }

    .compare-section + .compare-section {
      margin-top: 16px;
      padding-top: 14px;
      border-top: 1px solid rgba(148, 163, 184, 0.15);
    }

    .compare-section-title {
      font-size: 10px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.12em;
      color: var(--text-muted);
      margin-bottom: 10px;
    }

    .compare-vs-badge {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      background: var(--text-main);
      border: 3px solid var(--bg-elevated);
      border-radius: 50%;
      width: 56px;
      height: 56px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      font-weight: 800;
      color: #fff;
      z-index: 2;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }

    @media (max-width: 768px) {
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .compare-vs-badge {
        display: none;
      }
    }

    /* Pricing Table */
    .pricing-section-new {
      padding: 40px 0 32px;
    }

    .pricing-inner {
      background: var(--bg-elevated);
      border-radius: var(--radius-xl);
      border: 1px solid var(--border-subtle);
      box-shadow: var(--shadow-soft);
      padding: 32px 28px 28px;
    }

    .pricing-header-new {
      display: flex;
      flex-direction: column;
      gap: 10px;
      margin-bottom: 24px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      align-self: flex-start;
      padding: 5px 12px;
      border-radius: 999px;
      border: 1px solid var(--border-subtle);
      background: var(--bg-soft);
    }

    .eyebrow-text {
      font-size: 10px;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      font-weight: 600;
      color: var(--text-muted);
    }

    .pricing-title-new {
      font-size: 26px;
      font-weight: 700;
      letter-spacing: -0.025em;
      margin: 6px 0 8px;
      color: var(--text-main);
    }

    .pricing-subtitle-new {
      font-size: 14px;
      color: var(--text-muted);
      max-width: 640px;
      line-height: 1.7;
    }

    .pricing-subtitle-new strong {
      color: var(--text-main);
      font-weight: 600;
    }

    .pricing-table-wrapper {
      margin-top: 24px;
      overflow-x: auto;
      border-radius: 14px;
      border: 1px solid var(--border-subtle);
      background: var(--bg-soft);
    }

    .pricing-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 13px;
    }

    .pricing-table th,
    .pricing-table td {
      padding: 14px 18px;
      border-bottom: 1px solid rgba(148, 163, 184, 0.15);
      vertical-align: top;
    }

    .pricing-table th {
      font-weight: 500;
      color: var(--text-muted);
      text-align: left;
      white-space: nowrap;
      font-size: 12px;
    }

    .pricing-table td {
      color: var(--text-main);
      font-size: 13px;
    }

    .pricing-table thead tr th {
      background: var(--bg-elevated);
      border-bottom: 1px solid var(--border-subtle);
      padding: 18px;
    }

    .pricing-table .pricing-table-heading {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.01em;
      margin-bottom: 6px;
    }

    .pricing-table .pricing-pill {
      display: inline-flex;
      align-items: baseline;
      gap: 4px;
      padding: 4px 10px;
      border-radius: 999px;
      border: 1px solid var(--border-subtle);
      font-size: 12px;
      font-weight: 600;
      font-variant-numeric: tabular-nums;
      background: var(--bg-soft);
      color: var(--text-muted);
    }

    .pricing-table .pricing-pill--primary {
      border-color: var(--accent);
      background: rgba(99, 102, 241, 0.12);
      color: var(--accent);
    }

    .pricing-table tbody tr:hover {
      background: rgba(99, 102, 241, 0.04);
    }

    .pricing-table th:nth-child(3),
    .pricing-table td:nth-child(3) {
      background: rgba(99, 102, 241, 0.06);
    }

    .pricing-table thead th:nth-child(3) {
      background: rgba(99, 102, 241, 0.1);
    }

    .pricing-table tbody tr:last-child th,
    .pricing-table tbody tr:last-child td {
      border-bottom: none;
    }

    .voice-packages-row {
      margin: 24px 0 0;
      padding: 18px 20px;
      border-radius: 14px;
      border: 1px solid var(--border-subtle);
      background: var(--bg-soft);
      font-size: 13px;
      color: var(--text-muted);
    }

    .voice-packages-row strong {
      color: var(--accent);
      font-weight: 600;
    }

    .voice-packages-list {
      margin-top: 12px;
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .voice-package-pill {
      padding: 7px 12px;
      border-radius: 10px;
      border: 1px solid var(--border-subtle);
      background: var(--bg-elevated);
      font-size: 12px;
      font-weight: 500;
      color: var(--text-main);
      transition: all 0.15s ease;
    }

    .voice-package-pill:hover {
      border-color: var(--accent);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    }

    .voice-packages-note {
      margin-top: 10px;
      font-size: 11px;
      color: var(--text-muted);
    }

    .cta-row {
      margin-top: 28px;
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: flex-start;
      align-items: center;
    }

    .cta-note {
      width: 100%;
      margin-top: 6px;
      font-size: 12px;
      color: var(--text-muted);
    }

    .cta-note strong {
      color: var(--accent);
    }

    /* FAQ */
    .faq-section {
      padding: 40px 0 30px;
    }

    .faq-header {
      text-align: center;
      margin-bottom: 22px;
    }

    .faq-header h2 {
      font-size: 20px;
      margin-bottom: 4px;
    }

    .faq-header p {
      font-size: 14px;
      color: var(--text-muted);
    }

    .faq-list {
      max-width: 780px;
      margin: 0 auto;
      display: grid;
      gap: 10px;
    }

    .faq-item {
      border-radius: 14px;
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      overflow: hidden;
      box-shadow: var(--shadow-chip);
    }

    .faq-question {
      padding: 12px 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 14px;
    }

    .faq-toggle {
      width: 22px;
      height: 22px;
      border-radius: 999px;
      border: 1px solid var(--border-subtle);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      color: var(--text-muted);
      flex-shrink: 0;
    }

    .faq-answer {
      display: none;
      padding: 0 16px 12px;
      border-top: 1px solid var(--border-subtle);
      font-size: 13px;
      color: var(--text-muted);
    }

    .faq-answer p {
      margin-top: 8px;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-item.active .faq-toggle {
      border-color: var(--accent);
      color: var(--accent);
    }

    /* Illustrations */
    .illustration {
      width: 100%;
      max-width: 400px;
      height: auto;
      border-radius: var(--radius-lg);
    }

    .illustration-use-case {
      width: 100%;
      max-width: 280px;
      height: 180px;
      object-fit: cover;
      border-radius: var(--radius-lg);
      margin-bottom: 16px;
    }

    .hero-image {
      width: 100%;
      max-width: 340px;
      height: auto;
      border-radius: 32px;
      filter: drop-shadow(0 25px 50px rgba(99, 102, 241, 0.25));
      transition: transform 0.3s ease;
    }

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

    .hero-showcase {
      display: flex;
      justify-content: flex-end;
      position: relative;
    }

    .hero-showcase::before {
      content: '';
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 280px;
      height: 280px;
      background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
      border-radius: 50%;
      z-index: -1;
    }

    .science-illustration {
      max-width: 500px;
      margin: 0 auto 32px;
      display: block;
    }

    .cta-illustration {
      width: 120px;
      height: 120px;
      flex-shrink: 0;
      border-radius: var(--radius-lg);
    }

    /* Testimonials */
    .testimonials-section {
      padding: 50px 0;
      background: var(--bg-soft);
    }

    .testimonials-header {
      text-align: center;
      margin-bottom: 32px;
    }

    .testimonials-header h2 {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .testimonials-header p {
      color: var(--text-muted);
      font-size: 14px;
    }

    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    @media (max-width: 900px) {
      .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 600px) {
      .testimonials-grid {
        grid-template-columns: 1fr;
      }
    }

    .testimonial-card {
      background: var(--bg-elevated);
      border-radius: var(--radius-lg);
      padding: 20px;
      border: 1px solid var(--border-subtle);
    }

    .testimonial-stars {
      color: #f59e0b;
      font-size: 14px;
      margin-bottom: 12px;
    }

    .testimonial-text {
      font-size: 14px;
      line-height: 1.6;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .testimonial-avatar {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--accent-soft);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 14px;
      color: var(--accent);
    }

    .testimonial-name {
      font-weight: 600;
      font-size: 13px;
    }

    .testimonial-meta {
      font-size: 11px;
      color: var(--text-muted);
    }

    /* SEO About Section */
    .seo-section {
      padding: 50px 0;
      background: var(--bg-elevated);
    }

    .seo-content {
      max-width: 800px;
      margin: 0 auto;
    }

    .seo-content h2 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }

    .seo-content p {
      font-size: 14px;
      line-height: 1.7;
      color: var(--text-muted);
      margin-bottom: 14px;
    }

    .seo-content strong {
      color: var(--text-main);
    }

    /* CTA */
    .cta-section {
      padding: 30px 0 40px;
    }

    .cta-card {
      border-radius: var(--radius-xl);
      padding: 24px 24px 22px;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.06), rgba(79, 70, 229, 0.04)),
                  var(--bg-elevated);
      border: 1px solid rgba(99, 102, 241, 0.3);
      box-shadow: var(--shadow-soft);
      display: flex;
      justify-content: space-between;
      gap: 18px;
      align-items: center;
      flex-wrap: wrap;
    }

    .cta-text h2 {
      font-size: 20px;
      margin-bottom: 6px;
    }

    .cta-text p {
      font-size: 14px;
      color: var(--text-muted);
      max-width: 480px;
    }

    .cta-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    /* Footer */
    .site-footer {
      border-top: 1px solid var(--border-subtle);
      background: var(--bg-soft);
      padding: 14px 0 18px;
      font-size: 12px;
      color: var(--text-muted);
    }

    .footer-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 10px;
      flex-wrap: wrap;
    }

    .footer-row a {
      color: var(--accent);
      font-weight: 500;
      font-size: 12px;
    }

    /* Responsive */
    @media (max-width: 960px) {
      .hero-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
      }

      .hero-image {
        max-width: 260px;
      }
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }

      .hero-showcase {
        order: 1;
        justify-content: center;
      }

      .hero-image {
        max-width: 280px;
      }

      .stats-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
      }

      .features-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .split {
        grid-template-columns: minmax(0, 1fr);
      }

      .pricing-grid {
        grid-template-columns: minmax(0, 1fr);
      }

      .cta-card {
        align-items: flex-start;
      }
    }

    @media (max-width: 768px) {
      .nav {
        padding-inline: 16px;
      }

      .nav-links {
        display: none;
      }

      .nav-toggle {
        display: inline-flex;
      }

      .nav-open .nav-links {
        position: absolute;
        left: 0;
        right: 0;
        top: 100%;
        padding: 10px 20px 12px;
        background: var(--bg-elevated);
        border-bottom: 1px solid var(--border-subtle);
        display: flex;
        flex-direction: column;
        gap: 8px;
      }

      .header-cta {
        display: none;
      }

      .hero {
        padding-top: 28px;
      }

      .hero-card {
        margin-top: 6px;
      }

      .hero-heading {
        font-size: 26px;
      }

      .features-grid {
        grid-template-columns: minmax(0, 1fr);
      }

      .stats-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .cta-card {
        padding: 18px 16px;
      }
    }

    @media (max-width: 520px) {
      .stats-grid {
        grid-template-columns: minmax(0, 1fr);
      }

      .hero-floating-card {
        position: relative;
        inset: auto;
        margin-top: 10px;
      }

      .section-header {
        flex-direction: column;
        align-items: flex-start;
      }

      .cta-card {
        flex-direction: column;
        align-items: flex-start;
      }
    }