@import "variables.css";

@layer reset, base, layout, components, utilities;

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

@layer base {
  :root {
    color-scheme: light;
  }

  html { scroll-behavior: smooth; }
  body {
    font-family: var(--font-family-sans), sans-serif;
    font-size: var(--font-size-2);
    line-height: var(--line-height-normal);
    color: var(--text);
    background-color: var(--surface);
  }

  a { color: var(--link-color); text-decoration: none; }
  a:hover { text-decoration: underline; }

  h1, h2, h3 { line-height: var(--line-height-tight); }
  h1 { font-size: var(--font-size-7); }
  h2 { font-size: var(--font-size-6); color: var(--heading-color); }
  h3 { font-size: var(--font-size-4); color: var(--heading-color); }

  p { margin-block: var(--space-4); color: var(--text-muted); font-size: var(--font-size-3); }
  ul, ol { margin-block: var(--space-4); padding-left: var(--space-6); }

  :where(a, button, [role="button"]) {
    outline: none;
  }
  :where(a, button, [role="button"]):focus-visible {
    outline: 3px solid color-mix(in oklab, var(--color-secondary), white 20%);
    outline-offset: 2px;
  }
}

@layer layout {
  header {
    background: var(--gradient-primary);
    color: white;
    padding-block: var(--space-7);
    padding-inline: var(--space-5);
    text-align: center;
    box-shadow: var(--shadow-2);

    h1 { margin-bottom: var(--space-2); max-width: var(--max-width); margin-inline: auto; }
    h2 { opacity: 0.95; max-width: var(--max-width); margin-inline: auto; font-weight: var(--font-weight-medium); color: var(--color-yellow); }
  }

  nav {
    background: var(--surface);
    border-bottom: 2px solid var(--border);
    position: sticky; top: 0; z-index: var(--z-nav);
    box-shadow: var(--shadow-1);
    padding-inline: var(--space-5);

    > ul {
      display: flex; list-style: none; justify-content: center; flex-wrap: wrap;
      gap: var(--space-6); padding-block: var(--space-4); max-width: var(--max-width); margin-inline: auto;

      li { position: relative; }
      a, button { color: var(--text); font-weight: var(--font-weight-semibold); padding: var(--space-2) var(--space-4); border-radius: var(--radius-2); transition: all var(--duration-2) var(--ease-1); display: block; background: transparent; border: none; }
      a:hover, button:hover { background: var(--surface-2); color: var(--color-primary); text-decoration: none; }
      a.active { background: var(--surface-2); color: var(--color-primary); }

      /* Dropdowns */
      ul {
        position: absolute; top: 100%; left: 0; background: var(--surface); min-width: 200px; box-shadow: var(--shadow-3);
        border-radius: var(--radius-2); opacity: 0; visibility: hidden; transform: translateY(-10px);
        transition: all var(--duration-2) var(--ease-1); margin-top: var(--space-2); padding-block: 0; display: flex; flex-direction: column; gap: 0;

        li { border-bottom: 1px solid var(--border); }
        li:last-child { border-bottom: none; }
        a { padding: var(--space-3) var(--space-4); }
        a:hover { background: var(--surface-2); color: var(--color-primary); padding-left: var(--space-5); }
      }

      li:hover ul { opacity: 1; visibility: visible; transform: translateY(0); }
    }
  }

  main {
    padding-block: var(--space-7);
    padding-inline: var(--space-5);
    min-height: 60vh;
    max-width: var(--max-width);
    margin-inline: auto;
    container-type: inline-size;

    section { margin-bottom: var(--space-7); }
    section > h2 { margin-bottom: var(--space-5); padding-bottom: var(--space-2); border-bottom: 2px solid var(--border); }
  }

  footer {
    background: var(--surface-2);
    border-top: 2px solid var(--border);
    padding-block: var(--space-6);
    padding-inline: var(--space-5);
    text-align: center;
    margin-top: var(--space-8);

    p { color: var(--text-muted); margin-bottom: var(--space-2); max-width: var(--max-width); margin-inline: auto; }
    a { color: var(--color-primary); }
  }
}

@layer components {
  /* Classless grid via custom element */
  layout-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-5);
    margin-block: var(--space-6);
    container-type: inline-size;

    @container (min-width: 64rem) {
      > [data-span-lg="2"] { grid-column: span 2; }
      > [data-span-lg="3"] { grid-column: span 3; }
      > [data-span-lg="4"] { grid-column: span 4; }
    }

		h3 {
			margin-bottom: var(--space-2);
			padding-bottom: var(--space-2);
			border-bottom: 2px solid var(--border);
		}

		> a h3 { color: var(--link-color); }
		> article h3 { color: var(--heading-color); }

    > a, > article {
      background: var(--surface);
      padding: var(--space-5);
      border: 1px solid var(--border);
      border-radius: var(--radius-2);
      color: var(--text);
      position: relative;
      transition: all var(--duration-2) var(--ease-1);
      text-decoration: none;

      &::before {
        content: '';
        position: absolute; inset: 0 0 auto 0; height: 4px;
        background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
        transform: scaleX(0); transform-origin: left; transition: transform var(--duration-2) var(--ease-1);
      }
      &:hover { transform: translateY(-4px); box-shadow: var(--shadow-2); border-color: var(--color-secondary); }
      &:hover::before { transform: scaleX(1); }
    }

    .link-arrow { position: absolute; bottom: var(--space-4); right: var(--space-4); font-size: var(--font-size-5); color: var(--color-secondary); transition: transform var(--duration-2) var(--ease-1); }
    a:hover .link-arrow { transform: translateX(5px); }
  }

  /* Buttons, classless-first */
  button, a[role="button"], .button {
    display: inline-block; padding: var(--space-3) var(--space-5); border-radius: var(--radius-2);
    font-weight: var(--font-weight-semibold); transition: all var(--duration-2) var(--ease-1);
    border: 2px solid transparent; cursor: pointer; font-size: var(--font-size-2);
  }
  a[role="button"], .button { text-decoration: none; }
  .is-primary, [data-variant="primary"] { background: var(--color-primary); color: white; }
  .is-primary:hover, [data-variant="primary"]:hover { background: var(--color-secondary); transform: translateY(-2px); box-shadow: var(--shadow-2); }
  .is-outline, [data-variant="outline"] { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
  .is-outline:hover, [data-variant="outline"]:hover { background: var(--color-primary); color: white; transform: translateY(-2px); box-shadow: var(--shadow-2); }

  /* Code blocks */
  pre { background: #2d2d2d; color: #f8f8f2; padding: var(--space-4); border-radius: var(--radius-2); overflow: auto; margin-block: var(--space-4); }
  pre code { background: none; padding: 0; }
  code { font-family: var(--font-family-mono), monospace; background: var(--surface-2); padding: var(--space-1) var(--space-2); border-radius: var(--radius-1); font-size: 0.9em; }
  .code-header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-2); }
  .code-header h4 { margin: 0; }
  .copy-btn { background: var(--surface-2); color: var(--text); border: 1px solid var(--border); padding: 0.4rem 0.6rem; border-radius: var(--radius-2); cursor: pointer; }
  .copy-btn:hover { background: var(--surface-3); }
  .code-block { font-family: var(--font-family-mono); font-size: 0.9em; line-height: 1.5; }
  .code-block .line { display: grid; grid-template-columns: 3.2ch 1fr; gap: var(--space-3); }
  .code-block .ln { color: #9aa2a6; text-align: right; user-select: none; }
  .code-block .lc { white-space: pre; }
  .code-block .focus { background: rgba(238, 170, 43, 0.18); border-left: 3px solid var(--color-yellow); padding-left: calc(var(--space-3) - 3px); }

  /* Component tweaks */
  .status-completed { color: var(--color-green); font-weight: var(--font-weight-semibold); }
  .progress-bar { background: var(--surface-3); border: 1px solid var(--border); border-radius: var(--radius-2); overflow: hidden; }
  .progress-fill { background: var(--color-secondary); height: 8px; width: var(--progress-width, 0%); transition: width var(--duration-2) var(--ease-1); }
  .code-output { background: #2d2d2d; color: #f8f8f2; padding: var(--space-4); border-radius: var(--radius-2); font-family: var(--font-family-mono); font-size: 0.9em; min-height: 200px; overflow: auto; }

  /* Tabs (CSS-only, class-light) */
  .tabs { margin-block: var(--space-6); }
  .tabs input[type="radio"] { position: absolute; opacity: 0; pointer-events: none; }
  .tab-labels { display: flex; gap: var(--space-2); border-bottom: 2px solid var(--border); margin-bottom: var(--space-4); flex-wrap: wrap; }
  .tab-labels label {
    padding: var(--space-2) var(--space-4);
    cursor: pointer;
    border: 1px solid transparent;
    border-bottom: 2px solid transparent;
    border-radius: var(--radius-2) var(--radius-2) 0 0;
    font-weight: var(--font-weight-semibold);
    color: var(--text);
  }
  /* Active states */
  #tab-run:checked ~ .tab-labels label[for="tab-run"],
  #tab-log:checked ~ .tab-labels label[for="tab-log"],
  #tab-source:checked ~ .tab-labels label[for="tab-source"] {
    border-color: var(--border);
    border-bottom-color: var(--surface);
    background: var(--surface);
  }
  .tab-panels > section { display: none; }
  #tab-run:checked ~ .tab-panels > [data-tab="run"],
  #tab-log:checked ~ .tab-panels > [data-tab="log"],
  #tab-source:checked ~ .tab-panels > [data-tab="source"] { display: block; }
  .tab-panels > section { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-2); padding: var(--space-5); }

  /* Page-specific grid helpers via data attributes */
  layout-grid[data-layout="demo-two"] {
    grid-template-columns: 1fr;
  }
  layout-grid[data-layout="demo-two"] {
    @container (min-width: 48rem) { grid-template-columns: 1.3fr 1fr; }
    @container (min-width: 72rem) { grid-template-columns: 1.6fr 1fr; }
  }
  layout-grid[data-layout="stats"] {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }
}

@layer utilities {
  .visually-hidden,
  .sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0 0 0 0);
    white-space: nowrap; border: 0;
  }

  .text-center { text-align: center; }
  .hidden { display: none !important; }
}

@layer layout {
  @media (max-width: 768px) {
    header h1 { font-size: var(--font-size-5); }
    nav ul { flex-direction: column; gap: var(--space-2); }
    nav ul li ul { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; margin-left: var(--space-4); margin-top: 0; }
  }
}

@layer components {
  @media (max-width: 768px) {
    layout-grid { grid-template-columns: 1fr; }
    button, a[role="button"], .button { width: 100%; text-align: center; }
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* Fallback (non-layer) tab styles in case layers are unsupported */
.tabs input[type="radio"] { display: none; }
.tab-labels { display: flex; gap: 0.5rem; border-bottom: 2px solid var(--border); margin-bottom: 1rem; flex-wrap: wrap; }
.tab-labels label { padding: 0.5rem 0.75rem; cursor: pointer; border: 1px solid transparent; border-bottom: 2px solid transparent; border-radius: 8px 8px 0 0; font-weight: 600; }
#tab-run:checked ~ .tab-labels label[for="tab-run"],
#tab-log:checked ~ .tab-labels label[for="tab-log"],
#tab-source:checked ~ .tab-labels label[for="tab-source"] { border-color: var(--border); border-bottom-color: var(--surface); background: var(--surface); }
.tab-panels > section { display: none; }
#tab-run:checked ~ .tab-panels > [data-tab="run"],
#tab-log:checked ~ .tab-panels > [data-tab="log"],
#tab-source:checked ~ .tab-panels > [data-tab="source"] { display: block; }