@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&family=Sora:wght@400;500;600;700;800&display=swap');

    /* Design System Tokens */
    :root {
      --bg-base: #060913;
      --bg-surface: #0c1020;
      --bg-surface-glow: #141b34;
      --text-primary: #f3f4f6;
      --text-secondary: #9ca3af;
      --text-muted: #6b7280;
      --accent-cyan: #00d5ff;
      --accent-purple: #9d4edd;
      --accent-purple-glow: rgba(157, 78, 221, 0.4);
      --accent-cyan-glow: rgba(0, 213, 255, 0.4);
      --accent-amber: #ffbe0b;
      --accent-green: #38b000;
      --glass-bg: rgba(12, 16, 32, 0.6);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-border-hover: rgba(0, 213, 255, 0.25);
      --font-sans: 'Inter', sans-serif;
      --font-heading: 'Sora', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    }

    /* Reset & Base Styles */
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      scroll-behavior: smooth;
    }

    body {
      background-color: var(--bg-base);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.6;
      overflow-x: hidden;
      position: relative;
    }

    /* Custom Scrollbar */
    ::-webkit-scrollbar {
      width: 8px;
      height: 8px;
    }

    ::-webkit-scrollbar-track {
      background: var(--bg-base);
    }

    ::-webkit-scrollbar-thumb {
      background: var(--bg-surface-glow);
      border-radius: 4px;
    }

    ::-webkit-scrollbar-thumb:hover {
      background: var(--accent-cyan);
    }

    /* Ambient Glowing Blobs */
    .glow-blob {
      position: absolute;
      border-radius: 50%;
      filter: blur(140px);
      z-index: 0;
      pointer-events: none;
      opacity: 0.45;
      mix-blend-mode: screen;
      animation: pulse-glow 12s infinite alternate ease-in-out;
    }

    .glow-blob-1 {
      top: -10%;
      right: 5%;
      width: 450px;
      height: 450px;
      background: var(--accent-cyan-glow);
    }

    .glow-blob-2 {
      top: 25%;
      left: -10%;
      width: 500px;
      height: 500px;
      background: var(--accent-purple-glow);
      animation-delay: 3s;
    }

    .glow-blob-3 {
      bottom: 10%;
      right: -5%;
      width: 400px;
      height: 400px;
      background: var(--accent-cyan-glow);
      animation-delay: 6s;
    }

    @keyframes pulse-glow {
      0% {
        transform: scale(1) translate(0, 0);
        opacity: 0.35;
      }

      100% {
        transform: scale(1.2) translate(30px, -20px);
        opacity: 0.55;
      }
    }

    /* Global Container */
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 10;
    }

    /* Typography Utilities */
    h1,
    h2,
    h3,
    h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.25;
    }

    p {
      color: var(--text-secondary);
      font-size: 16px;
    }

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      font-family: var(--font-sans);
      font-size: 15px;
      font-weight: 600;
      border-radius: 30px;
      cursor: pointer;
      text-decoration: none;
      transition: var(--transition-smooth);
      gap: 8px;
      position: relative;
      overflow: hidden;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
      color: #000000;
      font-weight: 700;
      box-shadow: 0 4px 20px rgba(0, 213, 255, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 25px rgba(0, 213, 255, 0.5), 0 0 15px rgba(157, 78, 221, 0.4);
      color: #ffffff;
    }

    .btn-secondary {
      background: var(--glass-bg);
      border-color: var(--glass-border);
      color: var(--text-primary);
      backdrop-filter: blur(12px);
    }

    .btn-secondary:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-2px);
      box-shadow: 0 4px 15px rgba(0, 213, 255, 0.15);
    }

    /* Glassmorphism Card Style */
    .glass-card {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      transition: var(--transition-smooth);
    }

    .glass-card:hover {
      border-color: var(--glass-border-hover);
      box-shadow: 0 12px 40px rgba(0, 213, 255, 0.08);
    }

    /* Navigation Header */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(6, 9, 19, 0.6);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--glass-border);
      transition: var(--transition-smooth);
    }

    header.scrolled {
      padding: 12px 0;
      background: rgba(6, 9, 19, 0.85);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .logo-text {
      text-decoration: none;
      color: var(--text-primary);
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 22px;
      letter-spacing: -0.03em;
      background: linear-gradient(to right, var(--accent-cyan), #ffffff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    nav {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    nav a {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 14px;
      font-weight: 500;
      transition: var(--transition-smooth);
    }

    nav a:hover {
      color: var(--accent-cyan);
    }

    /* Hero Section (Centered layout) */
    .hero-section {
      padding: 160px 0 60px 0;
      text-align: center;
      position: relative;
    }

    .hero-content {
      max-width: 840px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .hero-title {
      font-size: 48px;
      line-height: 1.15;
      margin-bottom: 24px;
      font-weight: 800;
      color: #ffffff;
    }

    .hero-title span {
      background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      filter: drop-shadow(0 2px 10px rgba(0, 213, 255, 0.1));
    }

    .hero-description {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-ctas {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
      margin-bottom: 24px;
    }

    .cta-notice {
      font-size: 13px;
      color: var(--accent-cyan);
      font-weight: 600;
      letter-spacing: 0.05em;
      text-transform: uppercase;
    }

    .hero-trust-line {
      font-size: 14px;
      color: var(--text-muted);
      max-width: 480px;
      line-height: 1.5;
    }

    /* Video Showcase (Directly below hero, no frame) */
    .video-showcase-section {
      padding: 20px 0 80px 0;
      text-align: center;
    }

    .video-wrapper {
      max-width: 900px;
      margin: 0 auto;
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.1);
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 30px rgba(0, 213, 255, 0.05);
      background: #070913;
    }

    .video-wrapper video {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    /* Why Students Struggle Section */
    .struggle-section {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px auto;
    }

    .section-subtitle {
      color: var(--accent-cyan);
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 36px;
      margin-bottom: 18px;
    }

    .struggle-intro {
      font-size: 17px;
      color: var(--text-secondary);
      text-align: center;
      max-width: 800px;
      margin: 0 auto 40px auto;
      line-height: 1.7;
    }

    .struggle-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 40px;
    }

    .struggle-card {
      padding: 30px;
    }

    .struggle-card h3 {
      font-size: 18px;
      margin-bottom: 12px;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .struggle-card h3 span {
      color: var(--accent-purple);
      font-size: 20px;
    }

    .struggle-card p {
      font-size: 14.5px;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    .struggle-footer {
      text-align: center;
      font-size: 16px;
      color: var(--text-secondary);
      max-width: 750px;
      margin: 0 auto;
      line-height: 1.7;
      border-top: 1px dashed rgba(255, 255, 255, 0.06);
      padding-top: 30px;
    }

    /* Key Features Grid Section */
    .features-section {
      padding: 80px 0;
      position: relative;
    }

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

    .feature-card {
      padding: 36px 28px;
      position: relative;
      overflow: hidden;
    }

    .feature-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 10% 10%, rgba(0, 213, 255, 0.04) 0%, transparent 60%);
      pointer-events: none;
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(0, 213, 255, 0.08);
      border: 1px solid rgba(0, 213, 255, 0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent-cyan);
    }

    .feature-card:nth-child(even) .feature-icon {
      background: rgba(157, 78, 221, 0.08);
      border-color: rgba(157, 78, 221, 0.15);
      color: var(--accent-purple);
    }

    .feature-card:nth-child(even)::before {
      background: radial-gradient(circle at 10% 10%, rgba(157, 78, 221, 0.04) 0%, transparent 60%);
    }

    .feature-title {
      font-size: 18px;
      margin-bottom: 12px;
    }

    .feature-text {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    /* How It Works Section */
    .how-it-works-section {
      padding: 80px 0;
      position: relative;
    }

    .timeline-container {
      max-width: 800px;
      margin: 50px auto 0 auto;
      position: relative;
    }

    .timeline-line {
      position: absolute;
      top: 0;
      left: 31px;
      width: 2px;
      height: 100%;
      background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-purple), transparent);
    }

    .timeline-step {
      display: grid;
      grid-template-columns: 64px 1fr;
      gap: 30px;
      margin-bottom: 48px;
      position: relative;
    }

    .timeline-step:last-child {
      margin-bottom: 0;
    }

    .step-number {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background: var(--bg-surface);
      border: 2px solid var(--accent-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 18px;
      color: #ffffff;
      box-shadow: 0 0 20px rgba(0, 213, 255, 0.15);
      z-index: 10;
    }

    .timeline-step:nth-child(2n) .step-number {
      border-color: var(--accent-purple);
      box-shadow: 0 0 20px rgba(157, 78, 221, 0.15);
    }

    .step-content {
      padding-top: 14px;
    }

    .step-title {
      font-size: 20px;
      margin-bottom: 8px;
    }

    /* Who Is It For Section */
    .who-section {
      padding: 80px 0;
    }

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

    .who-card {
      padding: 30px;
    }

    .who-card h3 {
      font-size: 18px;
      margin-bottom: 12px;
      color: var(--accent-cyan);
    }

    .who-card:nth-child(even) h3 {
      color: var(--accent-purple);
    }

    .who-card p {
      font-size: 14.5px;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    /* Use Cases Section */
    .usecases-section {
      padding: 80px 0;
      background: rgba(6, 9, 19, 0.3);
      border-top: 1px solid rgba(255, 255, 255, 0.02);
      border-bottom: 1px solid rgba(255, 255, 255, 0.02);
    }

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

    .usecase-item {
      padding: 24px;
      border-left: 2.5px solid var(--accent-purple);
      background: rgba(255, 255, 255, 0.01);
    }

    .usecase-item:nth-child(odd) {
      border-left-color: var(--accent-cyan);
    }

    .usecase-title {
      font-size: 16px;
      margin-bottom: 8px;
      color: var(--text-primary);
    }

    .usecase-desc {
      font-size: 13.5px;
      color: var(--text-secondary);
      line-height: 1.5;
    }

    /* Comparison Section */
    .comparison-section {
      padding: 80px 0;
    }

    .comparison-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      max-width: 960px;
      margin: 0 auto;
    }

    .comparison-box {
      padding: 40px;
      border-radius: 16px;
    }

    .comparison-box.editors {
      background: rgba(255, 255, 255, 0.02);
      border: 1px solid rgba(255, 255, 255, 0.05);
    }

    .comparison-box.visualizer {
      background: rgba(0, 213, 255, 0.02);
      border: 1px solid rgba(0, 213, 255, 0.15);
      box-shadow: 0 0 25px rgba(0, 213, 255, 0.04);
    }

    .comparison-box h3 {
      font-size: 22px;
      margin-bottom: 24px;
      padding-bottom: 12px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .comparison-box.visualizer h3 {
      color: var(--accent-cyan);
      border-bottom-color: rgba(0, 213, 255, 0.15);
    }

    .comparison-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .comparison-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 15px;
      color: var(--text-secondary);
    }

    .comparison-box.visualizer .comparison-item {
      color: var(--text-primary);
    }

    .comparison-item svg {
      width: 18px;
      height: 18px;
      flex-shrink: 0;
    }

    .comparison-box.editors .comparison-item svg {
      color: var(--text-muted);
    }

    .comparison-box.visualizer .comparison-item svg {
      color: var(--accent-cyan);
    }

    /* Statistics Banner Section */
    .stats-section {
      padding: 60px 0;
      background: linear-gradient(90deg, rgba(6, 9, 19, 0.9), rgba(20, 27, 52, 0.4));
      border-top: 1px solid rgba(255, 255, 255, 0.03);
      border-bottom: 1px solid rgba(255, 255, 255, 0.03);
      margin: 40px 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-heading);
      font-size: 40px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 8px;
    }

    .stat-label {
      font-size: 14px;
      color: var(--text-secondary);
      font-weight: 500;
    }

    /* FAQ Section Accordions */
    .faq-section {
      padding: 80px 0;
    }

    .faq-container {
      max-width: 780px;
      margin: 40px auto 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      overflow: hidden;
      cursor: pointer;
    }

    .faq-header {
      padding: 24px 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .faq-title {
      font-size: 16px;
      font-weight: 600;
      color: var(--text-primary);
    }

    .faq-icon {
      width: 24px;
      height: 24px;
      color: var(--text-muted);
      transition: var(--transition-smooth);
      flex-shrink: 0;
    }

    .faq-item.active {
      border-color: rgba(0, 213, 255, 0.2);
    }

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

    .faq-body {
      max-height: 0;
      transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1);
      overflow: hidden;
    }

    .faq-content {
      padding: 0 30px 24px 30px;
      font-size: 14.5px;
      color: var(--text-secondary);
      line-height: 1.7;
    }

    /* LLM SEO Paragraph Section */
    .llm-seo-section {
      padding: 80px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.03);
    }

    .llm-seo-container {
      max-width: 900px;
      margin: 0 auto;
      text-align: center;
    }

    .llm-seo-title {
      font-size: 26px;
      margin-bottom: 20px;
      color: #ffffff;
    }

    .llm-seo-copy {
      font-size: 15.5px;
      color: var(--text-secondary);
      line-height: 1.8;
    }

    /* CTA Bottom Banner */
    .cta-banner-section {
      padding: 80px 0;
    }

    .cta-banner-card {
      padding: 60px 40px;
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      overflow: hidden;
    }

    .cta-banner-card::after {
      content: '';
      position: absolute;
      bottom: -150px;
      right: -150px;
      width: 300px;
      height: 300px;
      background: var(--accent-purple-glow);
      filter: blur(100px);
      border-radius: 50%;
      pointer-events: none;
    }

    .cta-banner-title {
      font-size: 32px;
      margin-bottom: 14px;
    }

    .cta-banner-desc {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 30px;
      max-width: 500px;
      margin-left: auto;
      margin-right: auto;
    }

    /* Footer Styles */
    footer {
      background: #04060c;
      border-top: 1px solid rgba(255, 255, 255, 0.03);
      padding: 80px 0 40px 0;
      position: relative;
      z-index: 10;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 60px;
      margin-bottom: 60px;
    }

    .footer-brand h4 {
      font-size: 20px;
      margin-bottom: 18px;
    }

    .footer-brand p {
      font-size: 14px;
      color: var(--text-secondary);
      max-width: 320px;
    }

    .footer-links h5 {
      font-size: 12px;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--text-muted);
      margin-bottom: 20px;
      font-family: var(--font-heading);
    }

    .footer-links ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .footer-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 14px;
      transition: var(--transition-smooth);
    }

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

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.03);
      padding-top: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .footer-bottom p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Scroll animations classes */
    .fade-in-on-scroll {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.8s ease-out, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    }

    .fade-in-on-scroll.appeared {
      opacity: 1;
      transform: translateY(0);
    }

    /* Responsive Design Media Queries */
    @media (max-width: 1024px) {
      .hero-title {
        font-size: 40px;
      }

      .features-grid {
        grid-template-columns: 1fr 1fr;
      }

      .who-grid {
        grid-template-columns: 1fr 1fr;
      }

      .usecases-grid {
        grid-template-columns: 1fr 1fr;
      }

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

    @media (max-width: 768px) {
      .hero-title {
        font-size: 34px;
      }

      .section-title {
        font-size: 28px;
      }

      .struggle-grid {
        grid-template-columns: 1fr;
      }

      .features-grid {
        grid-template-columns: 1fr;
      }

      .who-grid {
        grid-template-columns: 1fr;
      }

      .usecases-grid {
        grid-template-columns: 1fr;
      }

      .comparison-container {
        grid-template-columns: 1fr;
        gap: 24px;
      }

      .stats-grid {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }

      nav {
        display: none;
        /* Mobile menu collapsed */
      }
    }