/* ============================================
   CSS LAYERS - Order matters: later layers override earlier ones
   Following 37signals/fizzy approach
   ============================================ */
@layer reset, base, components, utilities;

/* ============================================
   RESET LAYER
   ============================================ */
@layer reset {
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html, body {
    overflow-x: clip;
  }

  body {
    min-height: 100dvh;
    font-family: sans-serif;
    font-size: 100%;
    line-height: 1.5;
    text-rendering: optimizeSpeed;
  }

  img {
    display: block;
    max-inline-size: 100%;
  }

  input, button, textarea, select {
    font: inherit;
  }

  button {
    cursor: pointer;
  }

  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
      scroll-behavior: auto !important;
    }
  }
}

/* ============================================
   BASE LAYER - Global design tokens & defaults
   ============================================ */
@layer base {
  :root {
    /* Dark theme colors matching thenulledge.com */
    --color-gray-100: #f8f8f8;
    --color-gray-200: #e4e4e4;
    --color-gray-300: #aeaeae;
    --color-gray-400: grey;
    --color-gray-500: #636363;
    --color-gray-600: #484848;
    --color-gray-700: #3a3a3a;
    --color-gray-800: #2e2e2e;
    --color-gray-900: #161616;

    --color-pink: #dd4462;
    --color-pink-subdued: #ce5769;
    --color-blue: #4467dd;
    --color-blue-subdued: #4d6cc8;
    --color-gold: #fbbe25;
    --color-gold-subdued: #f1c15b;

    --color-light: var(--color-gray-100);
    --color-dark: var(--color-gray-900);
    --color-text: var(--color-gray-100);
    --color-text-light: var(--color-gray-300);
    --color-bg: var(--color-gray-800);
    --color-bg-alt: var(--color-gray-700);
    --color-border: var(--color-gray-600);

    --color-primary: var(--color-pink-subdued);
    --color-secondary: var(--color-blue-subdued);
    --color-tertiary: var(--color-gold-subdued);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 5rem;

    /* Typography */
    --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Borders */
    --radius: 0.375rem;
  }

  body {
    font-family: var(--font-base);
    color: var(--color-text);
    line-height: 1.5;
    background: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
  }

  a {
    color: inherit;
    text-decoration-skip-ink: auto;
  }

  :is(a, button, input, textarea) {
    transition: 100ms ease-out;
    transition-property: background-color, border-color, box-shadow, outline, color;

    &:where(:focus-visible) {
      outline: 2px solid var(--color-primary);
      outline-offset: 2px;
    }
  }
}

/* ============================================
   COMPONENTS LAYER
   ============================================ */
@layer components {
  /* Container */
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
  }

  /* Header */
  .site-header {
    background: #000;
    border-bottom: 2px solid var(--color-border);
    padding: var(--space-md);
  }

  .header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
  }

  .site-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);

    &:hover { color: var(--color-primary); }
  }

  .site-nav {
    display: flex;
    gap: var(--space-lg);
    align-items: center;

    a {
      text-decoration: none;
      padding: var(--space-xs) var(--space-sm);
      border-radius: var(--radius);
      transition: color 0.2s;

      &:hover, &[aria-current="page"] {
        color: var(--color-primary);
      }
    }

    .user-nav-link {
      display: inline-flex;
      align-items: center;
      gap: 0.375rem;
      border: 1px solid var(--color-border);
      padding: 0.25rem 0.625rem;

      &:hover {
        border-color: var(--color-primary);
      }
    }
  }

  /* Main */
  main { flex: 1; }

  /* Footer */
  .site-footer {
    background: var(--color-gray-900);
    border-top: 2px solid var(--color-border);
    padding: var(--space-xl) var(--space-md);
    margin-top: var(--space-2xl);
  }

  .footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
  }

  .footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md) var(--space-lg);
    margin-bottom: var(--space-md);

    a {
      color: var(--color-text-light);
      text-decoration: none;
      transition: color 0.2s;

      &:hover { color: var(--color-primary); }
    }
  }

  .footer-copyright {
    color: var(--color-text-light);
    font-size: 0.875rem;
  }

  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    background: var(--color-text);
    color: var(--color-bg);
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 500;
    border: 2px solid var(--color-text);
    cursor: pointer;
    transition: all 0.2s;

    &:hover {
      background: var(--color-gray-200);
      border-color: var(--color-gray-200);
    }
  }

  .btn-primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-light);

    &:hover {
      background: var(--color-pink);
      border-color: var(--color-pink);
    }
  }

  .btn-outline {
    background: transparent;
    border: 2px solid var(--color-text);
    color: var(--color-text);

    &:hover {
      background: var(--color-text);
      color: var(--color-bg);
    }
  }

  .btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: 1.125rem;
  }

  /* Cards */
  .card {
    background: var(--color-bg-alt);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-lg);
    transition: all 0.2s;

    &:hover {
      border-color: var(--color-primary);
    }
  }

  .card-featured {
    border-color: var(--color-primary);
    border-width: 2px;
  }

  /* Topic Idea Cards (shared across home page and /topic_ideas) */
  .topic-card {
    background: var(--color-bg-alt);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-lg);
    display: flex;
    gap: var(--space-lg);
    align-items: flex-start;
    transition: border-color 0.2s;
  }

  .topic-card:hover {
    border-color: var(--color-gray-600);
  }

  .topic-vote {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    min-width: 3rem;
    flex-shrink: 0;
  }

  .topic-vote .vote-count {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1;
  }

  .topic-vote .vote-btn {
    background: none;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text-light);
    padding: var(--space-xs);
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
  }

  .topic-vote .vote-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
  }

  .topic-vote .vote-btn.upvoted {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: white;
  }

  .topic-vote .vote-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
  }

  .topic-body {
    flex: 1;
    min-width: 0;
  }

  .topic-body h3 {
    font-size: 1.125rem;
    margin-bottom: var(--space-xs);
    word-wrap: break-word;
  }

  .topic-body .description {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    margin-bottom: var(--space-sm);
    word-wrap: break-word;
  }

  .topic-body .meta {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
  }

  .topic-body .meta .submitter {
    color: var(--color-text-light);
  }

  /* Alerts */
  .alert {
    padding: var(--space-md);
    border-radius: var(--radius);
    margin-bottom: var(--space-md);
  }

  .alert-notice {
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid #10b981;
    color: #6ee7b7;
  }

  .alert-alert {
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid #ef4444;
    color: #fca5a5;
  }

  /* Sections */
  .section {
    padding: var(--space-3xl) var(--space-md);
  }

  .section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-md);
  }

  .section-subtitle {
    text-align: center;
    color: var(--color-text-light);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto var(--space-xl);
  }

  /* Form elements */
  .form-input {
    width: 100%;
    padding: var(--space-sm);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
    color: var(--color-text);
  }

  .form-input:focus {
    outline: none;
    border-color: var(--color-primary);
  }

  .form-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--space-xs);
    font-size: 0.875rem;
  }

  .form-error {
    background: #991b1b;
    border: 2px solid #ef4444;
    color: #fef2f2;
    padding: var(--space-md);
    border-radius: var(--radius);
    margin-bottom: var(--space-lg);
  }

  .form-error ul {
    margin-left: var(--space-lg);
    margin-top: var(--space-xs);
  }

  .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }

  .form-field {
    margin-bottom: var(--space-md);
  }

  .form-hint {
    color: var(--color-text-light);
    margin-bottom: var(--space-lg);
    font-size: 0.875rem;
  }

  .section-heading {
    font-size: 1.25rem;
    margin-top: 2rem;
    margin-bottom: var(--space-md);
  }

  .back-link {
    margin-bottom: 2rem;
  }

  .back-link a {
    color: var(--color-text-light);
  }

  .page-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
  }

  .page-subtitle {
    color: var(--color-text-light);
    margin-bottom: 2rem;
  }

  .unsubscribe-page {
    display: grid;
    place-items: center;
    min-height: 28rem;
    padding: var(--space-3xl) var(--space-md);
  }

  .unsubscribe-card {
    width: min(100%, 38rem);
    padding: clamp(2rem, 6vw, 4rem);
    text-align: center;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: calc(var(--radius) * 1.5);
    box-shadow: 0 1.5rem 4rem rgba(0, 0, 0, 0.24);
  }

  .unsubscribe-card-success {
    border-color: rgba(16, 185, 129, 0.55);
  }

  .unsubscribe-card-invalid {
    border-color: rgba(245, 158, 11, 0.55);
  }

  .unsubscribe-icon {
    display: grid;
    place-items: center;
    width: 3.5rem;
    height: 3.5rem;
    margin: 0 auto var(--space-lg);
    border-radius: 999px;
    background: rgba(16, 185, 129, 0.16);
    color: #6ee7b7;
    font-size: 1.75rem;
    font-weight: 700;
  }

  .unsubscribe-card-invalid .unsubscribe-icon {
    background: rgba(245, 158, 11, 0.16);
    color: #fbbf24;
  }

  .unsubscribe-eyebrow {
    margin-bottom: var(--space-sm);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
  }

  .unsubscribe-card h1 {
    margin-bottom: var(--space-md);
    font-size: clamp(1.75rem, 5vw, 2.5rem);
  }

  .unsubscribe-card p:not(.unsubscribe-eyebrow):not(.unsubscribe-note) {
    max-width: 28rem;
    margin: 0 auto var(--space-sm);
    color: var(--color-text-light);
  }

  .unsubscribe-note {
    margin-bottom: var(--space-xl);
    color: var(--color-gray-400);
    font-size: 0.875rem;
  }

  .unsubscribe-card .btn {
    margin-top: var(--space-md);
  }
}

/* ============================================
   UTILITIES LAYER
   ============================================ */
@layer utilities {
  .grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-lg); }
  .grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--space-lg); }
  .grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: var(--space-lg); }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .site-nav { gap: var(--space-md); }
  .section { padding: var(--space-2xl) var(--space-md); }
}