:root {
    --bg: #ffffff;
    --text: #0f172a;
    --muted: #475569;
    --border: #e2e8f0;
    --accent: #4f46e5;
    --accent-hover: #4338ca;
  }
  
  * {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica,
      Arial, "Apple Color Emoji", "Segoe UI Emoji";
    color: var(--text);
    background: var(--bg);
    line-height: 1.5;
  }
  
  .container {
    width: min(1100px, calc(100% - 48px));
    margin: 0 auto;
  }
  
  .header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 28px 0;
  }
  
  .logo {
    font-weight: 700;
    font-size: 20px;
    letter-spacing: -0.3px;
  }
  
  nav a {
    text-decoration: none;
    color: var(--muted);
    font-size: 14px;
  }
  
  nav a:hover {
    color: var(--text);
  }
  
  .hero {
    padding: 72px 0 48px;
    max-width: 720px;
  }
  
  h1 {
    font-size: clamp(36px, 5vw, 52px);
    line-height: 1.05;
    letter-spacing: -0.8px;
    margin: 0 0 20px;
  }
  
  .subtitle {
    font-size: 18px;
    color: var(--muted);
    margin-bottom: 32px;
  }
  
  .signup {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
  }
  
  .signup input[type="email"] {
    flex: 1;
    min-width: 240px;
    padding: 14px 16px;
    border-radius: 10px;
    border: 1px solid var(--border);
    font-size: 16px;
  }
  
  .signup input[type="email"]:focus {
    outline: none;
    border-color: var(--accent);
  }
  
  .signup button {
    padding: 14px 18px;
    border-radius: 10px;
    border: none;
    background: var(--accent);
    color: white;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
  }
  
  .signup button:hover {
    background: var(--accent-hover);
  }
  
  .note {
    margin-top: 14px;
    font-size: 14px;
    color: var(--muted);
  }
  
  .features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    padding: 48px 0 72px;
    border-top: 1px solid var(--border);
  }
  
  .feature h3 {
    margin: 0 0 8px;
    font-size: 16px;
  }
  
  .feature p {
    margin: 0;
    color: var(--muted);
    font-size: 15px;
  }
  
  .footer {
    padding: 28px 0 40px;
    border-top: 1px solid var(--border);
    font-size: 14px;
    color: var(--muted);
  }
  
  .hp {
    display: none;
  }
  
  @media (max-width: 900px) {
    .features {
      grid-template-columns: 1fr;
    }
  }