/* ===== Theme Variables ===== */
:root {
  --bg: #111111;
  --bg-card: #1c1c1c;
  --bg-card-alt: #222222;
  --bg-hover: #2a2a2a;
  --bg-svg: #161616;
  --border: #2e2e2e;
  --border-light: #252525;
  --text: #d4d4d4;
  --text-heading: #eeeeee;
  --text-secondary: #909090;
  --text-dim: #6a6a6a;
  --text-muted: #585858;
  --link: #aaaaaa;
  --link-hover: #cccccc;
  --btn-bg: #1e1e1e;
  --btn-border: #363636;
  --btn-hover: #2a2a2a;
  --accent-color: #666666;
  --table-border: #252525;
  --table-header-border: #333333;
  --crosshair: #3a3a3a;
  --svg-border: #252525;
  --highlight-shadow: rgba(255, 255, 255, 0.15);
}

[data-theme="light"] {
  --bg: #f0f0f0;
  --bg-card: #fff;
  --bg-card-alt: #fafafa;
  --bg-hover: #f5f5f5;
  --bg-svg: #fafafa;
  --border: #ddd;
  --border-light: #eee;
  --text: #222;
  --text-heading: #111;
  --text-secondary: #555;
  --text-dim: #666;
  --text-muted: #888;
  --link: #667;
  --link-hover: #444;
  --btn-bg: #fafafa;
  --btn-border: #ccc;
  --btn-hover: #eee;
  --accent-color: #555;
  --table-border: #eee;
  --table-header-border: #ddd;
  --crosshair: #bbb;
  --svg-border: #eee;
  --highlight-shadow: rgba(0, 0, 0, 0.3);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

/* ===== Page Container ===== */
.page {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ===== Card (Notebook Section) ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  transition: background 0.3s, border-color 0.3s;
}

/* ===== Header ===== */
.header {
  text-align: center;
  position: relative;
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-heading);
}

.header .subtitle {
  margin-top: 4px;
  color: var(--text-dim);
  font-size: 0.95rem;
}

/* ===== Theme Toggle ===== */
.theme-toggle {
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  background: var(--btn-bg);
  border: 1px solid var(--btn-border);
  border-radius: 6px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  transition: background 0.2s, border-color 0.2s;
  color: var(--text-secondary);
}

.theme-toggle:hover {
  background: var(--btn-hover);
}

/* ===== Intro ===== */
.intro p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ===== Main Grid ===== */
.main-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.viz-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

/* ===== Controls Section ===== */
.controls-section {
  padding: 16px;
}

.controls-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 8px;
}

.controls-header h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-heading);
}

.controls-actions {
  display: flex;
  gap: 8px;
}

.controls-actions button {
  padding: 4px 10px;
  font-size: 0.8rem;
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  background: var(--btn-bg);
  cursor: pointer;
  color: var(--text-secondary);
  transition: background 0.15s, border-color 0.15s;
}

.controls-actions button:hover {
  background: var(--btn-hover);
}

/* Category Group */
.category-group {
  margin-bottom: 12px;
}

.category-group:last-child {
  margin-bottom: 0;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 0;
  cursor: pointer;
  user-select: none;
}

.category-header input[type="checkbox"] {
  accent-color: var(--accent-color);
}

.category-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Format Row */
.format-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0 3px 20px;
  border-radius: 4px;
  transition: background 0.12s;
  cursor: pointer;
}

.format-row:hover,
.format-row.highlighted {
  background: var(--bg-hover);
}

.format-row.dimmed {
  opacity: 0.35;
}

.format-swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  flex-shrink: 0;
}

.format-row label {
  font-size: 0.85rem;
  cursor: pointer;
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
}

.format-row input[type="checkbox"] {
  flex-shrink: 0;
  accent-color: var(--accent-color);
}

.format-dims {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ===== Controls Divider ===== */
.controls-divider {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 16px 0 12px;
}

/* ===== Circle Controls ===== */
.circle-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0 3px 4px;
  border-radius: 4px;
  transition: background 0.12s;
  cursor: pointer;
}

.circle-row:hover,
.circle-row.highlighted {
  background: var(--bg-hover);
}

.circle-row.dimmed {
  opacity: 0.35;
}

.circle-swatch {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid;
  background: transparent;
  flex-shrink: 0;
}

.circle-row label {
  font-size: 0.85rem;
  cursor: pointer;
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
}

.circle-row input[type="checkbox"] {
  flex-shrink: 0;
  accent-color: var(--accent-color);
}

.circle-diameter {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ===== Reference Image Controls ===== */
.ref-image-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 8px;
}

.ref-image-select-row {
  padding: 4px 0;
}

.ref-image-select-row select {
  width: 100%;
  padding: 5px 8px;
  font-size: 0.85rem;
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  background: var(--btn-bg);
  color: var(--text-secondary);
  cursor: pointer;
}

.ref-opacity-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0 4px;
}

.ref-opacity-row label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.ref-opacity-row input[type="range"] {
  flex: 1;
  min-width: 0;
  accent-color: var(--accent-color);
}

.ref-opacity-row span {
  font-size: 0.75rem;
  color: var(--text-muted);
  min-width: 32px;
  text-align: right;
}

/* ===== Visualization Section ===== */
.viz-section {
  padding: 12px;
}

.svg-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  min-height: 300px;
  background: var(--bg-svg);
  border: 1px solid var(--svg-border);
  border-radius: 4px;
  overflow: hidden;
}

.svg-wrapper svg {
  display: block;
  width: 100%;
  height: 100%;
}

.empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.95rem;
  pointer-events: none;
}

.empty-state.hidden {
  display: none;
}

/* SVG format group states */
.format-group rect {
  transition: opacity 0.15s, stroke-width 0.15s;
}

.format-group text {
  transition: opacity 0.15s;
}

.format-group.dimmed rect,
.format-group.dimmed text {
  opacity: 0.15;
}

.format-group.highlighted rect {
  stroke-width: inherit;
  filter: drop-shadow(0 0 3px var(--highlight-shadow));
}

.format-group rect {
  cursor: pointer;
}

/* SVG circle group states */
.circle-group circle {
  transition: opacity 0.15s, stroke-width 0.15s;
  cursor: pointer;
}

.circle-group text {
  transition: opacity 0.15s;
}

.circle-group.dimmed circle,
.circle-group.dimmed text {
  opacity: 0.10;
}

.circle-group.highlighted circle {
  stroke-opacity: 1;
  fill-opacity: 0.08;
  filter: drop-shadow(0 0 3px var(--highlight-shadow));
}

.circle-group.highlighted text {
  opacity: 1;
}

/* ===== Tooltip ===== */
.tooltip {
  position: fixed;
  z-index: 1000;
  background: rgba(30, 30, 30, 0.94);
  color: #fff;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  line-height: 1.45;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.12s;
  max-width: 260px;
  white-space: nowrap;
}

.tooltip.visible {
  opacity: 1;
}

.tooltip .tt-name {
  font-weight: 600;
  margin-bottom: 2px;
}

.tooltip .tt-row {
  color: #ccc;
}

/* ===== Details Section ===== */
.details-section {
  padding: 16px;
}

.details-section.hidden {
  display: none;
}

.details-section h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-heading);
}

.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

#details-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

#details-table th,
#details-table td {
  padding: 6px 10px;
  text-align: left;
  border-bottom: 1px solid var(--table-border);
  white-space: nowrap;
  color: var(--text);
}

#details-table th {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-bottom: 2px solid var(--table-header-border);
}

#details-table tr {
  transition: background 0.12s;
}

#details-table tr.highlighted {
  background: var(--bg-hover);
}

#details-table tr.dimmed {
  opacity: 0.35;
}

#details-table .detail-swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  margin-right: 6px;
  vertical-align: middle;
}

/* ===== Coverage Indicators ===== */
.coverage-ok {
  color: #2e8b57;
  font-weight: 600;
}

.coverage-no {
  color: #c0392b;
  font-weight: 600;
}

[data-theme="dark"] .coverage-ok,
:root:not([data-theme="light"]) .coverage-ok {
  color: #5edb8a;
}

[data-theme="dark"] .coverage-no,
:root:not([data-theme="light"]) .coverage-no {
  color: #ef7070;
}

.coverage-cell {
  font-size: 0.78rem;
}

.coverage-cell span {
  margin-right: 6px;
  white-space: nowrap;
}

/* ===== Tooltip Coverage ===== */
.tooltip .tt-coverage-header {
  margin-top: 6px;
  padding-top: 4px;
  border-top: 1px solid rgba(255,255,255,0.15);
  font-weight: 600;
  color: #ddd;
  font-size: 0.75rem;
}

.tooltip .tt-coverage-ok {
  color: #6fcf97;
}

.tooltip .tt-coverage-no {
  color: #eb7070;
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 14px 20px;
}

.footer p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.footer a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

/* ===== Responsive: Tablet (>=600px) ===== */
@media (min-width: 600px) {
  .page {
    padding: 20px;
  }

  .header h1 {
    font-size: 1.75rem;
  }
}

/* ===== Responsive: Desktop (>=900px) ===== */
@media (min-width: 900px) {
  .page {
    padding: 24px;
    gap: 20px;
  }

  .main-grid {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 20px;
    align-items: start;
  }

  .controls-section {
    position: sticky;
    top: 24px;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
  }

  .header h1 {
    font-size: 2rem;
  }
}