:root {
  --cafe-brown: oklch(0.35 0.12 45);
  --cafe-cream: oklch(0.95 0.05 85);
  --cafe-accent: oklch(0.65 0.25 250); /* A vibrant blue accent */
  --cafe-bg: oklch(0.98 0.01 70);
  --text-primary: oklch(0.2 0.02 0);
  --glass-effect: rgba(255, 255, 255, 0.4);
  --shadow-sm: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --border-radius: 1rem;
}

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

  body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--cafe-bg);
    color: var(--text-primary);
    line-height: 1.5;
    background-image: 
      radial-gradient(var(--cafe-cream) 1px, transparent 1px);
    background-size: 20px 20px;
    min-height: 100vh;
  }

  h1, h2, h3 {
    color: var(--cafe-brown);
    font-weight: 800;
  }

  a {
    color: var(--cafe-accent);
    text-decoration: none;
    font-weight: 500;
  }
}

@layer components {
  .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    background: var(--glass-effect);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
  }

  .nav-logo {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: -0.05em;
  }

  .btn-primary {
    background-color: var(--cafe-brown);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 10px oklch(from var(--cafe-brown) l c h / 0.3);
  }

  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px oklch(from var(--cafe-brown) l c h / 0.4);
  }

  .btn-secondary {
    background: transparent;
    color: var(--cafe-brown);
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--cafe-brown);
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
  }

  .form-container {
    max-width: 450px;
    margin: 5rem auto;
    padding: 2.5rem;
    background: white;
    border-radius: 2rem;
    box-shadow: var(--shadow-lg);
    display: grid;
    gap: 1.5rem;
  }

  .input-group {
    display: grid;
    gap: 0.5rem;
  }

  .input-group label {
    font-size: 0.875rem;
    font-weight: 600;
    color: oklch(from var(--cafe-brown) l c h / 0.7);
  }

  .input-group input {
    padding: 1rem;
    border-radius: 0.75rem;
    border: 1px solid oklch(from var(--cafe-brown) l c h / 0.2);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
  }

  .input-group input:focus {
    outline: none;
    border-color: var(--cafe-accent);
    box-shadow: 0 0 0 4px oklch(from var(--cafe-accent) l c h / 0.1);
  }
}

/* Container Queries for responsive layouts */
@container (min-width: 400px) {
  .hero-text {
    font-size: 3rem;
  }
}

/* Has selector for state-based styling */
.input-group:has(input:invalid:not(:placeholder-shown)) label {
  color: oklch(0.6 0.2 0);
}