:root {
      --bg: #f6f6f9;
      --bg-accent: rgba(255, 255, 255, 0.5);
      --text: #0b0d18;
      --muted: #5a5e73;
      --accent: #5d5fef;
      --glow: rgba(93, 95, 239, 0.35);
    }

    [data-theme="dark"] {
      --bg: #080914;
      --bg-accent: rgba(11, 13, 24, 0.75);
      --text: #f9fbff;
      --muted: #b4b8d0;
      --accent: #f7a76c;
      --glow: rgba(247, 167, 108, 0.4);
      
    }

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

    body {
      font-family: 'Space Grotesk', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
      background: var(--bg);
      color: var(--text);
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .backdrop {
      position: fixed;
      width: 80vmax;
      height: 80vmax;
      background: radial-gradient(circle, var(--glow), transparent 70%);
      filter: blur(80px);
      opacity: 0.8;
      animation: float 18s ease-in-out infinite alternate;
    }

    .container {
      position: relative;
      width: min(900px, 92vw);
      padding: 3.5rem;
      border-radius: 32px;
      background: var(--bg-accent);
      border: 1px solid rgba(255, 255, 255, 0.1);
      box-shadow: 0 20px 80px rgba(3, 7, 18, 0.35);
      -webkit-backdrop-filter: blur(30px) saturate(140%);
      backdrop-filter: blur(30px) saturate(140%);
      isolation: isolate;
    }

    header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 3rem;
      position: relative;
      z-index: 2;
    }

    .logo {
      font-weight: 600;
      font-size: 1.25rem;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .toggle {
      border: none;
      background: var(--bg);
      color: var(--text);
      display: flex;
      align-items: center;
      gap: 0.65rem;
      padding: 0.35rem 0.55rem 0.35rem 0.9rem;
      border-radius: 30px;
      cursor: pointer;
      box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.04);
      transition: transform 250ms ease, box-shadow 250ms ease;
    }

    .toggle:hover {
      transform: translateY(-1px);
      box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.12);
    }

    .toggle-track {
      width: 54px;
      height: 28px;
      border-radius: 999px;
      background: linear-gradient(120deg, var(--accent), var(--glow));
      position: relative;
      overflow: hidden;
    }

    .toggle-thumb {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: var(--bg);
      position: absolute;
      top: 2px;
      left: 2px;
      display: grid;
      place-items: center;
      font-size: 0.9rem;
      transition: transform 300ms cubic-bezier(0.4, 0.17, 0.15, 1.4), rotate 500ms ease;
      box-shadow: 0 10px 30px rgba(15, 15, 35, 0.25);
    }

    [data-theme="dark"] .toggle-thumb {
      transform: translateX(26px) rotate(360deg);
    }

    .content {
      display: grid;
      gap: 2.5rem;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      position: relative;
      z-index: 2;
    }

    .hero-text h1 {
      font-size: clamp(2.7rem, 4vw, 4.1rem);
      line-height: 1.1;
      margin-bottom: 1.2rem;
    }

    .hero-text p {
      font-size: 1.05rem;
      color: var(--muted);
      max-width: 480px;
    }

    .card {
      padding: 1.5rem;
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.08);
      -webkit-backdrop-filter: blur(20px);
      backdrop-filter: blur(20px);
    }

    .card + .card {
      margin-top: 1.2rem;
    }

    .hero-actions {
      margin-top: 2rem;
      display: flex;
      align-items: center;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .goo-btn {
      position: relative;
      border: none;
      background: var(--accent);
      color: #ffffff;
      font-weight: 600;
      padding: 0.85rem 1.9rem;
      border-radius: 999px;
      cursor: pointer;
      font-size: 1rem;
      letter-spacing: 0.02em;
      box-shadow: 0 20px 40px rgba(93, 95, 239, 0.35);
      transition: transform 250ms ease, box-shadow 250ms ease;
      overflow: hidden;
      isolation: isolate;
    }

    [data-theme="dark"] .goo-btn {
      box-shadow: 0 20px 50px rgba(247, 167, 108, 0.35);
    }

    .goo-btn::before,
    .goo-btn::after {
      content: "";
      position: absolute;
      width: 140%;
      height: 140%;
      top: 50%;
      left: 50%;
      translate: -50% -50%;
      background: radial-gradient(circle, rgba(255, 255, 255, 0.35), transparent 60%);
      filter: blur(18px);
      opacity: 0.7;
      animation: goo-drift 6s ease-in-out infinite;
      z-index: -1;
    }

    .goo-btn::after {
      animation-duration: 4s;
      animation-direction: reverse;
    }

    .goo-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 25px 55px rgba(93, 95, 239, 0.45);
    }

    [data-theme="dark"] .goo-btn:hover {
      box-shadow: 0 25px 55px rgba(247, 167, 108, 0.45);
    }

    .hero-actions span {
      font-size: 0.95rem;
      color: var(--muted);
    }

    .swatches {
      display: flex;
      gap: 0.8rem;
      margin-top: 1.5rem;
    }

    .swatch {
      flex: 1;
      height: 90px;
      border-radius: 18px;
      position: relative;
      overflow: hidden;
    }

    .swatch span {
      position: absolute;
      bottom: 0.8rem;
      left: 1rem;
      font-size: 0.85rem;
      font-weight: 500;
    }

    .swatch.light {
      background: linear-gradient(135deg, #f6f6f9, #d3def8);
      color: #0b0d18;
    }

    .swatch.dark {
      background: linear-gradient(135deg, #070a1a, #1b1f3a);
      color: #f9fbff;
    }

    .illustration {
      position: relative;
      height: 320px;
      border-radius: 24px;
      background: radial-gradient(circle at top, rgba(255, 255, 255, 0.4), transparent),
      linear-gradient(145deg, rgba(255, 255, 255, 0.05), rgba(0, 0, 0, 0.08));
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.08);
      -webkit-backdrop-filter: blur(14px);
      backdrop-filter: blur(14px);
    }

    .orbit {
      position: absolute;
      width: 220px;
      height: 220px;
      border-radius: 50%;
      border: 1px dashed rgba(255, 255, 255, 0.3);
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      animation: orbit 24s linear infinite;
    }

    .planet {
      position: absolute;
      width: 70px;
      height: 70px;
      border-radius: 50%;
      background: radial-gradient(circle at 30% 30%, #fff1d0, #f0b67f);
      top: -35px;
      left: 50%;
      transform: translateX(-50%);
      box-shadow: 0 15px 45px rgba(0, 0, 0, 0.35);
    }

    .stars {
      position: absolute;
      inset: 0;
      background-image:
        radial-gradient(2px 2px at 20% 30%, rgba(255, 255, 255, 0.9), transparent),
        radial-gradient(2px 2px at 80% 70%, rgba(255, 255, 255, 0.8), transparent),
        radial-gradient(1px 1px at 60% 40%, rgba(255, 255, 255, 0.6), transparent);
      opacity: 0;
      transition: opacity 800ms ease;
    }

    [data-theme="dark"] .stars {
      opacity: 0.9;
    }

    .sunrise {
      position: absolute;
      bottom: -30%;
      left: -10%;
      width: 140%;
      height: 80%;
      background: radial-gradient(circle at 50% 20%, rgba(255, 214, 164, 0.7), transparent 60%);
      transition: transform 800ms ease, opacity 800ms ease;
    }

    [data-theme="dark"] .sunrise {
      transform: translateY(40%);
      opacity: 0.2;
    }

    @keyframes float {
      from {
        transform: translate(-10%, -5%) scale(1);
      }
      to {
        transform: translate(5%, 10%) scale(1.1);
      }
    }

    @keyframes orbit {
      to {
        transform: translate(-50%, -50%) rotate(360deg);
      }
    }

    @keyframes goo-drift {
      0% {
        transform: scale(1) translate(-10%, -8%);
      }
      50% {
        transform: scale(1.08) translate(6%, 5%);
      }
      100% {
        transform: scale(1) translate(-10%, -8%);
      }
    }