/* ==========================================================================
   Material Design 3 (M3) theme tokens — https://m3.material.io/
   Light scheme is the :root default; html[data-theme="dark"] overrides it.
   Role names follow the M3 color system (primary/secondary/tertiary,
   surface containers, outline, etc.) mapped onto this app's existing
   semantic variable names.
   ========================================================================== */

:root {
  /* M3 color roles — light scheme (indigo/blue seed) */
  --md-primary: #4355b9;
  --md-primary-rgb: 67, 85, 185;
  --md-on-primary: #ffffff;
  --md-primary-container: #dee0ff;
  --md-on-primary-container: #000a5e;

  --md-secondary-container: #dfe1f9;
  --md-on-secondary-container: #181a2c;

  --md-error: #ba1a1a;
  --md-error-rgb: 186, 26, 26;
  --md-on-error: #ffffff;

  --md-surface: #fbf8ff;
  --md-on-surface: #1b1b1f;
  --md-on-surface-rgb: 27, 27, 31;
  --md-on-surface-variant: #46464f;
  --md-outline: #767680;
  --md-outline-variant: #c7c5d0;

  --md-surface-container-lowest: #ffffff;
  --md-surface-container-low: #f5f2fa;
  --md-surface-container: #efecf4;
  --md-surface-container-high: #e9e7ef;
  --md-surface-container-highest: #e4e1e9;

  /* Semantic aliases used throughout this stylesheet */
  --bg: var(--md-surface);
  --bg-elevated: var(--md-surface-container-low);
  --text: var(--md-on-surface);
  --text-muted: var(--md-on-surface-variant);
  --border: var(--md-outline-variant);
  --accent: var(--md-primary);
  --accent-rgb: var(--md-primary-rgb);
  --accent-hover: #35449e;
  --accent-text: var(--md-on-primary);
  --danger: var(--md-error);
  --danger-rgb: var(--md-error-rgb);
  --danger-hover: #93000a;
  --input-bg: var(--md-surface-container-highest);
  --input-border: var(--md-outline);
  --table-head-bg: var(--md-surface-container-high);
  --table-row-alt: var(--md-surface-container);
  --badge-bg: var(--md-secondary-container);
  --badge-text: var(--md-on-secondary-container);
  --link: var(--md-primary);
  --code-bg: var(--md-surface-container-high);
  --state-on-rgb: var(--md-on-surface-rgb);
  --shadow: 0px 1px 2px rgba(0, 0, 0, 0.3), 0px 1px 3px 1px rgba(0, 0, 0, 0.15);

  /* Shape scale */
  --shape-xs: 4px;
  --shape-sm: 8px;
  --shape-md: 12px;
  --shape-lg: 16px;
  --shape-full: 999px;
}

html[data-theme="dark"] {
  --md-primary: #bac3ff;
  --md-primary-rgb: 186, 195, 255;
  --md-on-primary: #0c1785;
  --md-primary-container: #29339c;
  --md-on-primary-container: #dee0ff;

  --md-secondary-container: #434659;
  --md-on-secondary-container: #dfe1f9;

  --md-error: #ffb4ab;
  --md-error-rgb: 255, 180, 171;
  --md-on-error: #690005;

  --md-surface: #131318;
  --md-on-surface: #e4e1e9;
  --md-on-surface-rgb: 228, 225, 233;
  --md-on-surface-variant: #c7c5d0;
  --md-outline: #90909a;
  --md-outline-variant: #46464f;

  --md-surface-container-lowest: #0e0e13;
  --md-surface-container-low: #1b1b21;
  --md-surface-container: #1f1f25;
  --md-surface-container-high: #29292f;
  --md-surface-container-highest: #34343a;

  --accent-hover: #dbe0ff;
  --danger-hover: #ffdad6;
  --shadow: 0px 1px 2px rgba(0, 0, 0, 0.6), 0px 1px 3px 1px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.15s ease, color 0.15s ease;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
}

.app-header h1 {
  margin: 0 0 4px 0;
  font-size: 1.75rem;
  font-weight: 400;
  letter-spacing: 0;
}

.subtitle {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  max-width: 70ch;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 24px 60px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--shape-md);
  padding: 18px 20px;
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 6px 0;
  font-size: 1.05rem;
  font-weight: 500;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

details.collapsible summary {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  border-radius: var(--shape-sm);
  margin: -6px -8px 0;
  padding: 6px 8px;
}

details.collapsible summary:hover {
  background: rgba(var(--state-on-rgb), 0.06);
}

details.collapsible summary::-webkit-details-marker {
  display: none;
}

details.collapsible summary::before {
  content: '▶';
  font-size: 0.7em;
  color: var(--text-muted);
  transition: transform 0.15s ease;
  flex-shrink: 0;
}

details.collapsible[open] summary::before {
  transform: rotate(90deg);
}

details.collapsible summary h2 {
  margin: 0;
}

details.collapsible[open] summary {
  margin-bottom: 6px;
}

.hint {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 4px 0 12px 0;
}

.hint code {
  background: var(--code-bg);
  padding: 1px 5px;
  border-radius: var(--shape-xs);
  font-family: 'Roboto Mono', "SFMono-Regular", Consolas, monospace;
}

.controls-row, .preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-end;
  margin-bottom: 12px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 160px;
}

.field.grow {
  flex: 1 1 320px;
}

label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-muted);
}

/* M3 filled text field: tonal fill, square-ish top corners, bottom indicator line */
input[type="text"],
input[type="number"],
select,
textarea {
  background: var(--input-bg);
  border: none;
  border-bottom: 1px solid var(--input-border);
  color: var(--text);
  border-radius: var(--shape-xs) var(--shape-xs) 0 0;
  padding: 8px 10px;
  font-size: 0.92rem;
  font-family: inherit;
  width: 100%;
  outline: 2px solid transparent;
  outline-offset: 0;
  transition: border-color 0.12s ease, outline-color 0.12s ease, background 0.12s ease;
}

textarea {
  font-family: 'Roboto Mono', "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  resize: vertical;
  line-height: 1.4;
}

/* Custom dropdown arrow: a separate overlay element (not a background-image on
   the <select> itself), positioned to align with .input-clear-btn's ✕ above it.
   Using a sibling element instead of background-image avoids a Firefox bug
   where a select's own background-image leaks into its native popup list,
   tiling the icon across every option row. */
select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  padding-right: 34px;
}

.select-wrapper {
  position: relative;
}

.select-arrow {
  position: absolute;
  right: 9px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  fill: var(--text-muted);
  pointer-events: none;
}

input:hover, select:hover, textarea:hover {
  background: var(--md-surface-container-high);
}

input:focus, select:focus, textarea:focus {
  outline-color: var(--accent);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 7px;
}

.input-with-clear {
  position: relative;
}

.input-with-clear input {
  padding-right: 30px;
}

.input-clear-btn {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.8rem;
  line-height: 1;
  padding: 5px 6px;
  border-radius: var(--shape-full);
}

.input-clear-btn:hover {
  color: var(--danger);
  background: rgba(var(--danger-rgb), 0.12);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* M3 buttons: outlined by default, pill (fully-rounded) shape */
.btn {
  background: transparent;
  border: 1px solid var(--input-border);
  color: var(--accent);
  padding: 9px 20px;
  border-radius: var(--shape-full);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.015em;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease, transform 0.05s ease;
}

.btn:hover {
  background: rgba(var(--accent-rgb), 0.08);
  border-color: var(--accent);
}

.btn:active {
  transform: translateY(1px);
}

/* M3 filled button */
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
  font-weight: 500;
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: none;
}

/* M3 outlined button in the error role */
.btn-danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}

.btn-danger:hover {
  background: var(--danger);
  color: var(--md-on-error);
  border-color: var(--danger);
}

/* M3 text button */
.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text);
}

.btn-ghost:hover {
  background: rgba(var(--state-on-rgb), 0.08);
  border-color: transparent;
}

/* M3 icon button: compact circular target */
.btn-icon {
  padding: 0;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  border-radius: var(--shape-full);
}

.badge {
  background: var(--badge-bg);
  color: var(--badge-text);
  font-size: 0.78rem;
  padding: 3px 10px;
  border-radius: var(--shape-full);
  font-weight: 500;
  white-space: nowrap;
}

.badge-muted {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.section-heading {
  flex-wrap: wrap;
  row-gap: 8px;
}

.table-scroll {
  overflow-x: auto;
}

.table-scroll + .button-row,
textarea + .button-row {
  margin-top: 16px;
}

.button-row + textarea {
  margin-top: 12px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

thead th {
  text-align: left;
  background: var(--table-head-bg);
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}

tbody tr:nth-child(even) {
  background: var(--table-row-alt);
}

tbody td {
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

tbody td input {
  min-width: 80px;
}

.row-index {
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  width: 24px;
}

.row-actions {
  white-space: nowrap;
  position: sticky;
  right: 0;
  background: var(--bg-elevated);
  z-index: 1;
}

.row-actions-inner {
  display: flex;
  gap: 6px;
}

tbody tr:nth-child(even) .row-actions {
  background: var(--table-row-alt);
}

tbody tr.playing .row-actions {
  background: rgba(var(--accent-rgb), 0.35);
}

thead th:last-child {
  position: sticky;
  right: 0;
  background: var(--table-head-bg);
  z-index: 2;
}

.numeric-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 90px;
}

.numeric-cell input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  padding: 0;
  height: 16px;
}

tbody tr.playing {
  background: rgba(var(--accent-rgb), 0.35);
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

tbody tr.playing td {
  color: var(--text);
}

#stanza-string, #share-link {
  font-family: 'Roboto Mono', "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 20px 24px 40px;
}

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

@media (max-width: 640px) {
  .app-header {
    flex-direction: column;
  }
  .field {
    min-width: 0;
    flex: 1 1 45%;
  }
}