@layer base, layout, components, utilities;

@layer base {
  :root {
    --primary: oklch(0.6 0.2 250);
    --secondary: oklch(0.8 0.1 200);
    --accent: oklch(0.7 0.25 150);
    --bg: oklch(0.98 0.01 250);
    --surface: oklch(1 0 0);
    --text: oklch(0.2 0.02 250);
    --text-muted: oklch(0.5 0.02 250);
    --error: oklch(0.6 0.2 20);
    --success: oklch(0.7 0.2 140);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    --shadow-sm: 0 1px 2px 0 oklch(0 0 0 / 0.05);
    --shadow-md: 0 10px 15px -3px oklch(0 0 0 / 0.1), 0 4px 6px -2px oklch(0 0 0 / 0.05);
    --shadow-lg: 0 20px 25px -5px oklch(0 0 0 / 0.1), 0 10px 10px -5px oklch(0 0 0 / 0.04);
  }

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

  body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
  }

  h1, h2, h3 {
    font-weight: 700;
    letter-spacing: -0.025em;
  }
}

@layer layout {
  #app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }

  header {
    background: oklch(1 0 0 / 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid oklch(0.9 0.01 250);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  main {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    container-type: inline-size;
  }

  footer {
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
  }
}

@layer components {
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    gap: 0.5rem;
    font-size: 1rem;
  }

  .btn-primary {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 4px 14px 0 oklch(0.6 0.2 250 / 0.39);
  }

  .btn-primary:hover {
    background-color: oklch(0.55 0.2 250);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.23);
  }

  .card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid oklch(0.95 0.01 250);
    transition: transform 0.2s ease;
  }

  .input-group {
    margin-bottom: 1.5rem;
  }

  .input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-muted);
  }

  input, textarea, select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid oklch(0.9 0.01 250);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: border-color 0.2s ease;
    background: oklch(0.99 0.01 250);
  }

  input:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
  }

  .loading-overlay {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 50vh;
    font-weight: 600;
    color: var(--primary);
  }
}

@layer utilities {
  .text-center { text-align: center; }
  .mt-1 { margin-top: 1rem; }
  .mt-2 { margin-top: 2rem; }
  .grid { display: grid; gap: 2rem; }
  
  @container (min-width: 700px) {
    .grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  }
}