/* styles.css
   Visual system for the Task Breakdown app.

   Design principles:
     • Neutral palette, one accent, semantic colors only where they
       carry meaning (levels, statuses, feedback).
     • Borders instead of drop shadows. Shadows read as "generic AI
       app"; hairlines read as "deliberate tool".
     • Monospace for durations and levels — they are data, not prose.
     • Dark mode is a first-class theme, not an inverted light theme.
     • Every interactive element has a visible focus ring.
     • Layout is fluid; the only breakpoint (720px) targets phones.

   Class inventory is driven by ui.js and app.js. Adding a class
   there without adding a rule here is a bug in ui.js. */

/* ============================================================
   1. Design tokens
   ============================================================ */

:root {
  /* Base */
  --bg: #fafafa;
  --surface: #ffffff;
  --surface-alt: #f5f5f5;
  --border: #e5e5e5;
  --border-strong: #d4d4d4;

  /* Text */
  --text: #171717;
  --text-muted: #737373;
  --text-faint: #a3a3a3;

  /* Accent */
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-fg: #ffffff;

  /* Semantic */
  --success: #059669;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --warn: #d97706;
  --warn-bg: #fffbeb;
  --warn-border: #fde68a;
  --error: #dc2626;
  --error-bg: #fef2f2;
  --error-border: #fecaca;
  --info: #2563eb;
  --info-bg: #eff6ff;
  --info-border: #bfdbfe;

  /* Refinement-level colors — a visual progression from
     coarse (day, deep blue) to fine (minute, warm amber). */
  --level-day-fg: #1e40af;
  --level-day-bg: #dbeafe;
  --level-hour-fg: #0f766e;
  --level-hour-bg: #ccfbf1;
  --level-minute-fg: #92400e;
  --level-minute-bg: #fef3c7;

  /* Shape */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;

  /* Spacing scale — 4 px base unit */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --fs-sm: 12px;
  --fs-base: 14px;
  --fs-lg: 16px;
  --fs-xl: 20px;
  --fs-2xl: 24px;

  /* Layout */
  --container-max: 960px;
  --chunk-indent: 20px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0a;
    --surface: #171717;
    --surface-alt: #1f1f1f;
    --border: #262626;
    --border-strong: #404040;

    --text: #f5f5f5;
    --text-muted: #a3a3a3;
    --text-faint: #737373;

    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-fg: #0a0a0a;

    --success: #34d399;
    --success-bg: #062f24;
    --success-border: #065f46;
    --warn: #fbbf24;
    --warn-bg: #2c1a03;
    --warn-border: #78350f;
    --error: #f87171;
    --error-bg: #2f0d0d;
    --error-border: #7f1d1d;
    --info: #60a5fa;
    --info-bg: #0c1e3d;
    --info-border: #1e40af;

    --level-day-fg: #93c5fd;
    --level-day-bg: #1e3a8a;
    --level-hour-fg: #5eead4;
    --level-hour-bg: #134e4a;
    --level-minute-fg: #fcd34d;
    --level-minute-bg: #78350f;
  }
}

/* ============================================================
   2. Reset / base
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: var(--s-5) var(--s-4);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.55;
  min-height: 100vh;
}

#app {
  max-width: var(--container-max);
  margin: 0 auto;
}

h1, h2, h3 {
  margin: 0;
  font-weight: 600;
  line-height: 1.25;
}

h1 { font-size: var(--fs-2xl); letter-spacing: -0.01em; }
h2 { font-size: var(--fs-lg); }
h3 { font-size: var(--fs-base); }

p { margin: 0; }

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

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 1px 4px;
  background: var(--surface-alt);
  border-radius: var(--radius-sm);
}

pre {
  margin: var(--s-3) 0;
  padding: var(--s-3) var(--s-4);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: var(--fs-sm);
}

pre code {
  padding: 0;
  background: transparent;
}

ul {
  margin: 0;
  padding-left: var(--s-5);
}

/* ============================================================
   3. Focus + selection
   ============================================================ */

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

::selection {
  background: var(--accent);
  color: var(--accent-fg);
}

/* ============================================================
   4. Placeholder / boot fallback
   ============================================================ */

.abp-placeholder {
  padding: var(--s-6) var(--s-5);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: left;
}

.abp-placeholder h1 {
  margin-bottom: var(--s-3);
  font-size: var(--fs-xl);
}

.abp-placeholder p {
  margin-bottom: var(--s-3);
  color: var(--text-muted);
}

.abp-placeholder-hint {
  margin-top: var(--s-4);
  padding-top: var(--s-4);
  border-top: 1px solid var(--border);
  font-size: var(--fs-sm);
}

/* ============================================================
   5. Boot banner (rendered by app.js as sibling of #app)
   ============================================================ */

.abp-boot-banner {
  max-width: var(--container-max);
  margin: 0 auto var(--s-4);
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}

.abp-banner-item {
  display: flex;
  align-items: flex-start;
  gap: var(--s-3);
  padding: var(--s-3) var(--s-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: var(--fs-base);
}

.abp-banner-info {
  background: var(--info-bg);
  border-color: var(--info-border);
}

.abp-banner-warn {
  background: var(--warn-bg);
  border-color: var(--warn-border);
}

.abp-banner-error {
  background: var(--error-bg);
  border-color: var(--error-border);
}

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

.abp-banner-title {
  display: block;
  margin-bottom: 2px;
  font-size: var(--fs-base);
}

.abp-banner-message {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.abp-banner-close {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}

.abp-banner-close:hover {
  background: rgba(0, 0, 0, 0.06);
  color: var(--text);
}

@media (prefers-color-scheme: dark) {
  .abp-banner-close:hover {
    background: rgba(255, 255, 255, 0.08);
  }
}

/* ============================================================
   6. Top bar
   ============================================================ */

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
  padding-bottom: var(--s-4);
  margin-bottom: var(--s-4);
  border-bottom: 1px solid var(--border);
}

.topbar h1 {
  font-size: var(--fs-xl);
  letter-spacing: -0.01em;
}

.topbar-status {
  display: flex;
  gap: var(--s-2);
  align-items: center;
  flex-wrap: wrap;
}

.topbar-actions {
  display: flex;
  gap: var(--s-2);
}

.key-badge,
.busy-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 500;
}

.key-badge.ok {
  color: var(--success);
  background: var(--success-bg);
  border: 1px solid var(--success-border);
}

.key-badge.missing {
  color: var(--error);
  background: var(--error-bg);
  border: 1px solid var(--error-border);
}

.busy-badge {
  color: var(--info);
  background: var(--info-bg);
  border: 1px solid var(--info-border);
  animation: abp-pulse 1.4s ease-in-out infinite;
}

@keyframes abp-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

@media (prefers-reduced-motion: reduce) {
  .busy-badge { animation: none; }
}

/* ============================================================
   7. Buttons
   ============================================================ */

.btn-primary,
.btn-secondary,
.btn-small,
.btn-danger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  font-family: inherit;
  font-size: var(--fs-base);
  font-weight: 500;
  line-height: 1;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.12s ease, border-color 0.12s ease,
    color 0.12s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}
.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--surface-alt);
}

.btn-small {
  padding: 5px 10px;
  font-size: var(--fs-sm);
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-small:hover:not(:disabled) {
  background: var(--surface-alt);
}

.btn-danger {
  color: var(--error);
  border-color: var(--error-border);
}
.btn-danger:hover:not(:disabled) {
  background: var(--error-bg);
}

.btn-primary:disabled,
.btn-secondary:disabled,
.btn-small:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============================================================
   8. Panels
   ============================================================ */

.panel {
  margin-bottom: var(--s-4);
  padding: var(--s-5);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.panel h2 {
  margin-bottom: var(--s-2);
}

.panel .hint {
  margin-bottom: var(--s-4);
  color: var(--text-muted);
  font-size: var(--fs-sm);
}

/* ============================================================
   9. Keys panel
   ============================================================ */

.keys-grid {
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
}

.key-row {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}

.key-row label {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text);
}

.key-input-wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-2);
}

.key-input-wrap input {
  flex: 1 1 220px;
  min-width: 0;
  padding: 7px 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text);
  background: var(--surface-alt);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
}

.key-input-wrap input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 0;
  border-color: var(--accent);
}

.key-status {
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  border-radius: 999px;
}

.key-status.ok {
  color: var(--success);
  background: var(--success-bg);
}

.key-status.missing {
  color: var(--text-faint);
  background: var(--surface-alt);
}

.key-docs {
  font-size: var(--fs-sm);
  color: var(--text-muted);
}

.key-docs:hover {
  color: var(--accent);
}

/* ============================================================
   10. Task panel
   ============================================================ */

.task-input {
  width: 100%;
  padding: var(--s-3) var(--s-4);
  font-family: inherit;
  font-size: var(--fs-base);
  line-height: 1.5;
  color: var(--text);
  background: var(--surface-alt);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  resize: vertical;
  min-height: 80px;
}

.task-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 0;
  border-color: var(--accent);
}

.task-input:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.task-actions {
  display: flex;
  gap: var(--s-2);
  margin-top: var(--s-3);
}

.task-panel-active .task-text {
  font-size: var(--fs-lg);
  color: var(--text);
  word-break: break-word;
}

/* ============================================================
   11. Domain panel
   ============================================================ */

.domain-map {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: var(--s-3) var(--s-4);
  margin: 0 0 var(--s-4);
  padding: var(--s-4);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.domain-map dt {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.domain-map dd {
  margin: 0;
  min-width: 0;
  word-break: break-word;
}

.domain-map ul {
  margin: 0;
  padding-left: var(--s-5);
}

.domain-map li {
  margin-bottom: 2px;
}

.empty-list {
  color: var(--text-faint);
  font-style: italic;
}

.domain-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
}

@media (max-width: 720px) {
  .domain-map {
    grid-template-columns: 1fr;
    gap: var(--s-1);
  }
  .domain-map dt {
    margin-top: var(--s-3);
  }
  .domain-map dt:first-of-type {
    margin-top: 0;
  }
}

/* ============================================================
   12. Tree panel
   ============================================================ */

.tree-panel h2 {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--s-3);
  margin-bottom: var(--s-4);
}

.time-total {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-muted);
}

.tree {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
}

/* ============================================================
   13. Chunks (the tree nodes)
   ============================================================ */

.chunk {
  margin-left: calc(var(--depth, 0) * var(--chunk-indent));
  padding: var(--s-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

/* Top-level chunks get a stronger border. */
.chunk[style*="--depth: 0"] {
  border-color: var(--border-strong);
}

.chunk-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s-2);
  margin-bottom: var(--s-2);
}

.chunk-title {
  display: flex;
  align-items: baseline;
  gap: var(--s-2);
  min-width: 0;
  flex: 1 1 auto;
}

.chunk-verb {
  font-weight: 600;
  color: var(--text);
  text-transform: capitalize;
}

.chunk-object {
  color: var(--text);
}

.chunk-meta {
  display: flex;
  gap: var(--s-2);
  align-items: center;
  flex-shrink: 0;
}

.chunk-time {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-muted);
}

.chunk-level {
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
}

.chunk-level.level-day {
  color: var(--level-day-fg);
  background: var(--level-day-bg);
}

.chunk-level.level-hour {
  color: var(--level-hour-fg);
  background: var(--level-hour-bg);
}

.chunk-level.level-minute {
  color: var(--level-minute-fg);
  background: var(--level-minute-bg);
}

.chunk-deliverable {
  margin-bottom: var(--s-1);
  font-size: var(--fs-sm);
  color: var(--text);
  word-break: break-word;
}

.chunk-risk {
  margin-bottom: var(--s-3);
  font-size: var(--fs-sm);
  color: var(--warn);
  word-break: break-word;
}

.chunk-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  align-items: center;
}

.chunk-status {
  display: inline-flex;
  gap: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
}

.status-pill {
  padding: 4px 10px;
  font-family: inherit;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-muted);
  background: var(--surface);
  border: none;
  border-right: 1px solid var(--border-strong);
  cursor: pointer;
  transition: background-color 0.12s ease, color 0.12s ease;
}

.status-pill:last-child {
  border-right: none;
}

.status-pill:hover:not(:disabled) {
  background: var(--surface-alt);
  color: var(--text);
}

.status-pill.active {
  background: var(--accent);
  color: var(--accent-fg);
}

.status-pill:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.chunk-children {
  margin-top: var(--s-3);
  padding-top: var(--s-3);
  border-top: 1px dashed var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}

/* ============================================================
   14. Error bar and toast
   ============================================================ */

.error-bar {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  padding: var(--s-3) var(--s-4);
  margin-top: var(--s-4);
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: var(--fs-sm);
}

.error-bar strong {
  color: var(--error);
}

.error-bar button {
  margin-left: auto;
  flex-shrink: 0;
}

.toast {
  position: fixed;
  bottom: var(--s-5);
  left: 50%;
  transform: translateX(-50%);
  max-width: min(90vw, 480px);
  padding: var(--s-3) var(--s-4);
  border-radius: var(--radius);
  font-size: var(--fs-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  z-index: 1000;
  animation: abp-toast-in 0.16s ease-out;
}

.toast-info {
  border-color: var(--info-border);
  background: var(--info-bg);
}

.toast-success {
  border-color: var(--success-border);
  background: var(--success-bg);
}

.toast-warn {
  border-color: var(--warn-border);
  background: var(--warn-bg);
}

.toast-error {
  border-color: var(--error-border);
  background: var(--error-bg);
}

@keyframes abp-toast-in {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .toast { animation: none; }
}

/* ============================================================
   15. Fatal fallback (used by app.js if boot fails)
   ============================================================ */

.abp-boot-fatal {
  padding: var(--s-6);
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  border-radius: var(--radius-lg);
}

.abp-boot-fatal h2 {
  margin-bottom: var(--s-3);
  color: var(--error);
}

.abp-boot-fatal p {
  margin-bottom: var(--s-2);
  color: var(--text-muted);
}

/* ============================================================
   16. Responsive
   ============================================================ */

@media (max-width: 720px) {
  body {
    padding: var(--s-3) var(--s-3);
  }

  .panel {
    padding: var(--s-4);
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .topbar-actions {
    width: 100%;
    justify-content: flex-start;
  }

  .chunk {
    margin-left: calc(var(--depth, 0) * 12px);
    padding: var(--s-3);
  }

  .chunk-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .chunk-actions {
    width: 100%;
  }

  .chunk-status {
    width: 100%;
  }

  .status-pill {
    flex: 1;
  }

  .toast {
    left: var(--s-3);
    right: var(--s-3);
    transform: none;
    max-width: none;
  }

  @keyframes abp-toast-in {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
  }
}

/* ============================================================
   17. Print
   ============================================================ */

@media print {
  body {
    background: #fff;
    color: #000;
    padding: 0;
  }

  .keys-panel,
  .task-panel,
  .domain-panel,
  .topbar-actions,
  .chunk-actions,
  .abp-boot-banner,
  .toast,
  .error-bar {
    display: none !important;
  }

  .panel {
    border: none;
    padding: 0;
  }

  .chunk {
    break-inside: avoid;
    border-color: #999;
  }
}