:root {
      /* --- Dark Theme Tokens (Default) --- */
      --md-sys-color-primary: #D0BCFF;
      --md-sys-color-on-primary: #381E72;
      --md-sys-color-primary-container: #4F378B;
      --md-sys-color-on-primary-container: #EADDFF;
      --md-sys-color-secondary: #CCC2DC;
      --md-sys-color-on-secondary: #332D41;
      --md-sys-color-secondary-container: #4A4458;
      --md-sys-color-on-secondary-container: #E8DEF8;
      --md-sys-color-tertiary: #EFB8C8;
      --md-sys-color-on-tertiary: #492532;
      --md-sys-color-tertiary-container: #633B48;
      --md-sys-color-on-tertiary-container: #FFD8E4;
      --md-sys-color-surface: #141218;
      --md-sys-color-on-surface: #E6E1E5;
      --md-sys-color-surface-variant: #49454F;
      --md-sys-color-on-surface-variant: #CAC4D0;
      --md-sys-color-outline: #938F99;
      --md-sys-color-surface-container: #1D1B20;
      --md-sys-color-surface-container-high: #2B2930;
      --md-sys-color-error-container: #8C1D18;
      --md-sys-color-on-error-container: #F9DEDC;

      /* Adaptive UI Colors */
      --glass-surface: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(255, 255, 255, 0.1);
      --gradient-end: #322059;
      --shadow-color: rgba(0, 0, 0, 0.4);
      --mock-bg: #141218;
      /* Surface color hardcoded for mock to prevent transparency issues */

      /* Expressive Shapes */
      --shape-corner-extra-large: 48px;
      --shape-corner-large: 28px;
      --shape-corner-medium: 16px;
      --shape-corner-full: 9999px;

      /* Typography */
      --font-family: 'Roboto Flex', sans-serif;
  }

  /* --- Light Theme Tokens --- */
  @media (prefers-color-scheme: light) {
      :root {
          --md-sys-color-primary: #6750A4;
          --md-sys-color-on-primary: #FFFFFF;
          --md-sys-color-primary-container: #EADDFF;
          --md-sys-color-on-primary-container: #21005D;
          --md-sys-color-secondary: #625B71;
          --md-sys-color-on-secondary: #FFFFFF;
          --md-sys-color-secondary-container: #E8DEF8;
          --md-sys-color-on-secondary-container: #1D192B;
          --md-sys-color-tertiary: #7D5260;
          --md-sys-color-on-tertiary: #FFFFFF;
          --md-sys-color-tertiary-container: #FFD8E4;
          --md-sys-color-on-tertiary-container: #31111D;
          --md-sys-color-surface: #FEF7FF;
          --md-sys-color-on-surface: #1D1B20;
          --md-sys-color-surface-variant: #E7E0EC;
          --md-sys-color-on-surface-variant: #49454F;
          --md-sys-color-outline: #79747E;
          --md-sys-color-surface-container: #F3EDF7;
          --md-sys-color-surface-container-high: #ECE6F0;

          /* Adaptive UI Colors for Light Mode */
          --glass-surface: rgba(0, 0, 0, 0.05);
          --glass-border: rgba(0, 0, 0, 0.1);
          --gradient-end: #6750A4;
          --shadow-color: rgba(0, 0, 0, 0.15);
          --mock-bg: #FEF7FF;
      }
  }

  * {
      box-sizing: border-box;
  }

  body {
      background-color: var(--md-sys-color-surface);
      color: var(--md-sys-color-on-surface);
      font-family: var(--font-family);
      margin: 0;
      padding: 0;
      overflow-x: hidden;
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      transition: background-color 0.3s, color 0.3s;
  }

  /* --- Animation Utilities --- */
  .reveal-on-scroll {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.8s ease-out, transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
  }

  .reveal-on-scroll.is-visible {
      opacity: 1;
      transform: translateY(0);
  }

  .delay-100 {
      transition-delay: 0.1s;
  }

  .delay-200 {
      transition-delay: 0.2s;
  }

  .delay-300 {
      transition-delay: 0.3s;
  }

  /* --- Layout & Grid --- */
  .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
  }

  header {
      padding: 24px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
  }

  .logo {
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--md-sys-color-primary);
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
  }

  /* --- Hero Section (Expressive Large Type) --- */
  .hero {
      padding: 80px 0 120px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
  }

  h1 {
      font-size: clamp(3.5rem, 6vw, 5.5rem);
      line-height: 1.05;
      font-weight: 800;
      margin: 0 0 32px 0;
      letter-spacing: -2px;
      background: linear-gradient(135deg, var(--md-sys-color-primary), var(--md-sys-color-tertiary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
  }

  .hero-text p {
      font-size: 1.5rem;
      color: var(--md-sys-color-secondary);
      margin-bottom: 48px;
      max-width: 90%;
      font-weight: 300;
  }

  /* Expressive Container for Hero Image */
  .hero-visual {
      background: var(--md-sys-color-primary-container);
      border-radius: var(--shape-corner-extra-large);
      height: 500px;
      display: flex;
      justify-content: center;
      align-items: center;
      position: relative;
      overflow: hidden;
      animation: float 6s ease-in-out infinite;
  }

  @keyframes float {
      0% {
          transform: translateY(0px);
      }

      50% {
          transform: translateY(-10px);
      }

      100% {
          transform: translateY(0px);
      }
  }

  .visual-circle {
      position: absolute;
      width: 300px;
      height: 300px;
      background: var(--md-sys-color-tertiary);
      filter: blur(80px);
      opacity: 0.4;
      border-radius: 50%;
      top: -50px;
      right: -50px;
  }

  .visual-circle-2 {
      position: absolute;
      width: 200px;
      height: 200px;
      background: var(--md-sys-color-primary);
      filter: blur(60px);
      opacity: 0.3;
      border-radius: 50%;
      bottom: -20px;
      left: -20px;
  }

  /* --- Buttons --- */
  .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
  }

  .btn {
      height: 56px;
      padding: 0 32px;
      border-radius: var(--shape-corner-full);
      border: none;
      font-size: 1.125rem;
      font-weight: 500;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all 0.2s cubic-bezier(0.2, 0.0, 0, 1.0);
      text-decoration: none;
  }

  .btn-primary {
      background-color: var(--md-sys-color-primary);
      color: var(--md-sys-color-on-primary);
  }

  .btn-primary:hover {
      opacity: 0.9;
      box-shadow: 0 4px 8px var(--shadow-color);
      transform: translateY(-2px);
  }

  .btn-tonal {
      background-color: var(--md-sys-color-secondary-container);
      color: var(--md-sys-color-on-secondary-container);
  }

  .btn-tonal:hover {
      opacity: 0.9;
      box-shadow: 0 4px 8px var(--shadow-color);
      transform: translateY(-2px);
  }

  /* --- Features Section (Bento Grid) --- */
  .features {
      padding: 0 0 120px;
  }

  .section-header {
      margin-bottom: 48px;
  }

  .section-header h2 {
      font-size: 3rem;
      font-weight: 600;
      margin: 0;
      color: var(--md-sys-color-on-surface);
  }

  .grid {
      display: grid;
      grid-template-columns: repeat(12, 1fr);
      gap: 24px;
      grid-auto-rows: minmax(280px, auto);
  }

  .card {
      background-color: var(--md-sys-color-surface-container-high);
      border-radius: var(--shape-corner-large);
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: background-color 0.3s, transform 0.3s;
      position: relative;
      overflow: hidden;
      border: 1px solid transparent;
  }

  .card:hover {
      background-color: var(--md-sys-color-surface-variant);
      transform: translateY(-4px);
      border-color: var(--md-sys-color-outline);
  }

  .card h3 {
      font-size: 2rem;
      margin: 0 0 16px 0;
      font-weight: 600;
      line-height: 1.1;
  }

  .card p {
      font-size: 1.125rem;
      color: var(--md-sys-color-on-surface-variant);
      margin: 0;
  }

  .icon-box {
      width: 64px;
      height: 64px;
      background: var(--md-sys-color-primary-container);
      color: var(--md-sys-color-on-primary-container);
      border-radius: 24px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
  }

  .material-symbols-rounded {
      font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 48;
      font-size: 32px;
  }

  /* Grid Spans */
  .col-span-8 {
      grid-column: span 8;
  }

  .col-span-4 {
      grid-column: span 4;
  }

  .col-span-6 {
      grid-column: span 6;
  }

  .col-span-12 {
      grid-column: span 12;
  }

  /* Specific Card Styles */
  .card.highlight {
      background-color: var(--md-sys-color-secondary-container);
      color: var(--md-sys-color-on-secondary-container);
  }

  .card.highlight .icon-box {
      background-color: var(--md-sys-color-on-secondary-container);
      color: var(--md-sys-color-secondary-container);
  }

  .card.highlight p {
      color: var(--md-sys-color-on-secondary-container);
      opacity: 0.8;
  }

  .card.tertiary {
      background-color: var(--md-sys-color-tertiary-container);
      color: var(--md-sys-color-on-tertiary-container);
  }

  .card.tertiary .icon-box {
      background-color: var(--md-sys-color-on-tertiary-container);
      color: var(--md-sys-color-tertiary-container);
  }

  .card.tertiary p {
      color: var(--md-sys-color-on-tertiary-container);
      opacity: 0.9;
  }

  /* --- Stats Section --- */
  .stats-section {
      padding: 0 0 100px;
  }

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

  .stat-card {
      background-color: var(--md-sys-color-surface-container);
      border-radius: var(--shape-corner-extra-large);
      padding: 48px 24px;
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      transition: transform 0.3s;
      min-height: 250px;
  }

  .stat-card:hover {
      transform: scale(1.02);
      background-color: var(--md-sys-color-surface-container-high);
  }

  .stat-number {
      font-size: 5rem;
      font-weight: 800;
      line-height: 1;
      color: var(--md-sys-color-primary);
      margin-bottom: 8px;
      font-variant-numeric: tabular-nums;
  }

  .stat-label {
      font-size: 1.125rem;
      color: var(--md-sys-color-secondary);
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 1px;
  }

  .stat-loading {
      font-size: 2rem;
      opacity: 0.5;
      animation: pulse 1.5s infinite;
  }

  /* Contributor Icons Styles */
  .contributors-wrapper {
      display: flex;
      justify-content: center;
      align-items: center;
      margin-bottom: 16px;
      height: 80px;
      padding-left: 10px;
  }

  .contributor-avatar {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      border: 3px solid var(--md-sys-color-surface-container);
      margin-left: -16px;
      transition: transform 0.2s cubic-bezier(0.2, 0.0, 0, 1.0), z-index 0.2s, border-color 0.2s;
      background-color: var(--md-sys-color-surface-variant);
      position: relative;
      object-fit: cover;
      cursor: pointer;
      box-shadow: 0 4px 6px var(--shadow-color);
  }

  .stat-card:hover .contributor-avatar {
      border-color: var(--md-sys-color-surface-container-high);
  }

  .contributor-avatar:hover {
      transform: scale(1.25) translateY(-5px);
      z-index: 10;
      border-color: var(--md-sys-color-primary) !important;
      box-shadow: 0 8px 12px var(--shadow-color);
  }

  @keyframes pulse {
      0% {
          opacity: 0.3;
      }

      50% {
          opacity: 0.7;
      }

      100% {
          opacity: 0.3;
      }
  }

  /* --- Download Section --- */
  .download-section {
      background: linear-gradient(135deg, var(--md-sys-color-primary-container), var(--gradient-end));
      color: var(--md-sys-color-on-primary-container);
      border-radius: var(--shape-corner-extra-large);
      padding: 80px 24px;
      text-align: center;
      margin-bottom: 80px;
      display: flex;
      flex-direction: column;
      align-items: center;
  }

  .download-section h2 {
      font-size: 3.5rem;
      margin: 0 0 24px 0;
      line-height: 1.1;
  }

  .platforms {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-top: 48px;
  }

  .platform-chip {
      background: var(--glass-surface);
      border: 1px solid var(--glass-border);
      padding: 12px 32px;
      border-radius: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 500;
      transition: background 0.2s;
      cursor: pointer;
      text-decoration: none;
      color: inherit;
      font-size: 1.1rem;
  }

  .platform-chip:hover {
      background: var(--glass-border);
  }

  .platform-chip.beta {
      background-color: var(--md-sys-color-tertiary-container);
      color: var(--md-sys-color-on-tertiary-container);
      border: none;
  }

  .platform-chip.beta:hover {
      opacity: 0.9;
      box-shadow: 0 4px 8px var(--shadow-color);
  }

  /* Footer */
  footer {
      padding: 48px 0;
      border-top: 1px solid var(--md-sys-color-outline);
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--md-sys-color-secondary);
      font-size: 0.9rem;
      opacity: 0.8;
  }

  /* Mock UI Element Construction */
  .mock-app-ui {
      background: var(--mock-bg);
      width: 70%;
      height: 80%;
      border-radius: 24px;
      position: relative;
      z-index: 2;
      box-shadow: 0 24px 48px var(--shadow-color);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 20px;
      border: 1px solid var(--glass-border);
  }

  .mock-row {
      display: flex;
      gap: 16px;
      align-items: center;
  }

  .mock-cover {
      width: 80px;
      height: 80px;
      background: linear-gradient(45deg, var(--md-sys-color-tertiary), #FF8A80);
      border-radius: 12px;
  }

  .mock-lines {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 10px;
  }

  .mock-line {
      height: 12px;
      background: var(--md-sys-color-surface-variant);
      border-radius: 99px;
  }

  .w-60 {
      width: 60%;
  }

  .w-40 {
      width: 40%;
  }

  .w-80 {
      width: 80%;
  }

  .mock-player-bar {
      margin-top: auto;
      height: 60px;
      background: var(--md-sys-color-surface-container-high);
      border-radius: 16px;
      display: flex;
      align-items: center;
      padding: 0 16px;
      gap: 12px;
  }

  /* --- Mobile Responsive --- */
  @media (max-width: 900px) {
      .hero {
          grid-template-columns: 1fr;
          padding: 40px 0 60px;
          text-align: center;
      }

      .hero-text {
          display: flex;
          flex-direction: column;
          align-items: center;
      }

      .hero-text p {
          margin-left: auto;
          margin-right: auto;
      }

      .btn-group {
          justify-content: center;
      }

      .col-span-8,
      .col-span-4,
      .col-span-6,
      .col-span-12 {
          grid-column: span 12;
      }

      .hero-visual {
          height: 350px;
          margin-top: 24px;
      }

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

      .download-section h2 {
          font-size: 2.5rem;
      }

      footer {
          flex-direction: column;
          gap: 16px;
          text-align: center;
      }
  }