/* aipolicy -- design tokens + layout + dark mode + responsive */

/* ============================================
   Design Tokens
   ============================================ */

:root {
  /* Colors -- light mode */
  --color-bg: #fafafa;
  --color-surface: #fff;
  --color-text: #1a1a1a;
  --color-text-muted: #6b7280;
  --color-accent: #2563eb;
  --color-accent-subtle: rgb(37 99 235 / 8%);
  --color-accent-hover: #1d4ed8;
  --color-border: #e5e7eb;
  --color-preview-bg: #f3f4f6;
  --color-preview-text: #1f2937;
  --color-success: #16a34a;
  --color-btn-text: #fff;

  /* Typography */
  --font-ui: -apple-system, blinkmacsystemfont, "Segoe UI", roboto, "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", "JetBrains Mono", "Consolas", monospace;
  --font-size-base: 16px;
  --line-height-body: 1.5;
  --line-height-heading: 1.3;

  /* Layout */
  --max-width: 720px;
  --padding-desktop: 24px;
  --padding-mobile: 16px;
  --spacing-section: 24px;
  --spacing-element: 16px;
  --radius: 4px;
  --radius-lg: 6px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
}

/* Dark mode -- system preference or explicit toggle */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0f1117;
    --color-surface: #1a1d27;
    --color-text: #e5e7eb;
    --color-text-muted: #9ca3af;
    --color-accent: #60a5fa;
    --color-accent-subtle: rgb(96 165 250 / 12%);
    --color-accent-hover: #93bbfd;
    --color-border: #2d3140;
    --color-preview-bg: #141720;
    --color-preview-text: #d1d5db;
    --color-success: #4ade80;
    --color-btn-text: #0f1117;
  }
}

[data-theme="dark"] {
  --color-bg: #0f1117;
  --color-surface: #1a1d27;
  --color-text: #e5e7eb;
  --color-text-muted: #9ca3af;
  --color-accent: #60a5fa;
  --color-accent-subtle: rgb(96 165 250 / 12%);
  --color-accent-hover: #93bbfd;
  --color-border: #2d3140;
  --color-preview-bg: #141720;
  --color-preview-text: #d1d5db;
  --color-success: #4ade80;
  --color-btn-text: #0f1117;
}

/* ============================================
   Reduced Motion
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   Screen Reader Only
   ============================================ */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ============================================
   Base
   ============================================ */

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

html {
  font-size: var(--font-size-base);
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-ui);
  line-height: var(--line-height-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ============================================
   Skip to Content
   ============================================ */

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--padding-desktop);
  z-index: 100;
  padding: 8px 16px;
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
}

.skip-link:focus {
  top: 8px;
}

/* ============================================
   Layout
   ============================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--padding-desktop);
}

/* ============================================
   Header
   ============================================ */

.header {
  padding: var(--spacing-section) 0 var(--spacing-section);
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-section);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--color-text);
}

.header-brand svg {
  width: 28px;
  height: 28px;
}

.header-brand-name {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: var(--line-height-heading);
  margin-bottom: 4px;
}

.header .subtitle {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

/* ============================================
   Theme Toggle
   ============================================ */

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2px;
}

.theme-toggle button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  border-radius: calc(var(--radius) - 1px);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle button:hover {
  color: var(--color-text);
}

.theme-toggle button[aria-pressed="true"] {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.theme-toggle button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

/* ============================================
   Preset Cards (Zone 1)
   ============================================ */

.presets {
  display: flex;
  gap: var(--spacing-element);
  margin-bottom: var(--spacing-section);
}

.preset-card {
  flex: 1;
  padding: 16px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-left: 3px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  font-size: inherit;
  color: var(--color-text);
  transition: border-color var(--transition-fast), background-color var(--transition-fast), border-left-color var(--transition-fast);
}

.preset-card:hover {
  border-color: var(--color-accent);
}

.preset-card:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.preset-card[aria-checked="true"] {
  border-color: var(--color-accent);
  border-left: 3px solid var(--color-accent);
  background-color: var(--color-accent-subtle);
}

.preset-card .preset-label {
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: 4px;
}

.preset-card .preset-desc {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* ============================================
   Preview Pane (Zone 2)
   ============================================ */

.preview-section {
  margin-bottom: var(--spacing-section);
}

.tab-bar {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 0;
}

.tab-bar button {
  padding: 10px 16px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  border-radius: var(--radius) var(--radius) 0 0;
  margin-bottom: -1px;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.tab-bar button:hover {
  color: var(--color-text);
}

.tab-bar button[aria-selected="true"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  background-color: var(--color-accent-subtle);
}

.tab-bar button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.preview-pane {
  position: relative;
  background: var(--color-preview-bg);
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.preview-content {
  display: block;
  width: 100%;
  padding: 16px;
  min-height: 360px;
  max-height: 440px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--color-preview-text);
  background: transparent;
  border: none;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  tab-size: 2;
  resize: vertical;
}

.preview-content[hidden] {
  display: none;
}

.preview-content:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 20px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  font-size: 0.75rem;
  font-family: var(--font-ui);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  cursor: pointer;
  opacity: 0.85;
  transition: color var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
  z-index: 1;
}

.copy-btn:hover {
  opacity: 1;
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.copy-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.copy-btn.copied {
  color: var(--color-success);
  border-color: var(--color-success);
}

/* ============================================
   Actions Row
   ============================================ */

.actions-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-element);
  margin-bottom: var(--spacing-section);
}

.customize-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-family: inherit;
  font-size: 0.875rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.customize-toggle:hover {
  color: var(--color-text);
}

.customize-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.customize-toggle .arrow {
  display: inline-block;
  transition: transform var(--transition-fast);
  font-size: 0.75rem;
}

.customize-toggle[aria-expanded="true"] .arrow {
  transform: rotate(90deg);
}

.download-btn {
  padding: 12px 24px;
  min-height: 44px;
  background: var(--color-accent);
  color: var(--color-btn-text);
  border: none;
  border-radius: var(--radius-lg);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.download-btn:hover {
  background: var(--color-accent-hover);
}

.download-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.download-confirm {
  font-size: 0.8125rem;
  color: var(--color-success);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.download-confirm.visible {
  opacity: 1;
}

/* ============================================
   Customize Panel
   ============================================ */

.customize-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

/* .open state managed by JS inline max-height for smooth transition */

.customize-panel-inner {
  padding: var(--spacing-element) var(--spacing-element) var(--spacing-section);
  margin-top: 4px;
  background: var(--color-preview-bg);
  border-radius: var(--radius-lg);
}

.option-group {
  margin-bottom: var(--spacing-section);
}

.option-group-title {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.option-row {
  margin-bottom: 12px;
}

.option-row label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.option-row .option-desc {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.option-row select,
.option-row input[type="text"] {
  width: 100%;
  max-width: 360px;
  padding: 8px 12px;
  font-family: inherit;
  font-size: 0.875rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition-fast);
}

.option-row select:focus,
.option-row input[type="text"]:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
  border-color: var(--color-accent);
}

/* ============================================
   Convention Explainer (Zone 3)
   ============================================ */

.explainer {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-section);
  margin-bottom: var(--spacing-section);
}

.explainer h2 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: var(--line-height-heading);
  margin-bottom: 8px;
}

.explainer p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-section);
  line-height: 1.6;
}

.explainer a {
  color: var(--color-accent);
  text-decoration: none;
}

.explainer a:hover {
  text-decoration: underline;
}

.explainer a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============================================
   404 Page
   ============================================ */

.not-found-link {
  color: var(--color-accent);
  text-decoration: none;
}

.not-found-link:hover {
  text-decoration: underline;
}

/* ============================================
   Footer
   ============================================ */

.footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 0 var(--spacing-section);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer a:hover {
  color: var(--color-text);
}

.footer a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============================================
   Responsive
   ============================================ */

@media (width <= 768px) {
  .container {
    padding: 0 var(--padding-mobile);
  }

  .presets {
    flex-direction: column;
  }

  .preset-card {
    flex: none;
  }

  .actions-row {
    flex-direction: column;
    align-items: stretch;
  }

  .download-btn {
    width: 100%;
    text-align: center;
  }

  .option-row select,
  .option-row input[type="text"] {
    max-width: 100%;
  }

  .header h1 {
    font-size: 1.25rem;
  }

  .copy-btn {
    right: 12px;
    padding: 5px 10px;
  }

  .tab-bar button {
    padding: 10px;
    font-size: 0.75rem;
  }

  .customize-panel-inner {
    padding: 12px;
  }

  .preview-content {
    min-height: 280px;
    max-height: 360px;
  }
}