/* Dark is this page's default/native look (not just a fallback) --
   deliberately unconditional so it renders consistently for anyone
   without an OS preference either way. The light variant right below
   exists purely to respect prefers-color-scheme: light for people who've
   actually asked for light pages system-wide; it's the one branch that's
   conditional, not the other way around. */
:root {
  --color-bg: #131316;
  --color-bg-highlight: rgba(255, 255, 255, 0.04);
  --color-surface: #1c1c21;
  --color-surface-input: #131316;
  --color-border: #2f2f37;
  --color-text: #f2f2f4;
  --color-text-muted: #8a8a94;
  --color-primary: #ef8a3d;
  --color-primary-hover: #f6a35f;
  --color-primary-gradient: linear-gradient(135deg, #f2a054, #e2701c);
  --color-primary-gradient-hover: linear-gradient(135deg, #f6b06c, #ef7d24);
  --color-primary-contrast: #ffffff;
  --color-error-bg: rgba(240, 82, 82, 0.12);
  --color-error-border: rgba(240, 82, 82, 0.35);
  --color-error-text: #ff8f8f;
  --color-loading-bg: rgba(239, 138, 61, 0.12);
  --color-loading-text: #f2a054;
  --color-warning-bg: rgba(217, 180, 40, 0.12);
  --color-warning-border: rgba(217, 180, 40, 0.35);
  --color-warning-text: #e8c547;
  --radius: 10px;
  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 12px;
  --spacing-4: 16px;
  --spacing-5: 24px;
  --spacing-6: 32px;
}

@media (prefers-color-scheme: light) {
  :root {
    --color-bg: #f7f5f2;
    --color-bg-highlight: rgba(28, 28, 33, 0.03);
    --color-surface: #ffffff;
    --color-surface-input: #fbfaf8;
    --color-border: #e0ddd6;
    --color-text: #1c1c21;
    --color-text-muted: #6b6b73;
    --color-primary: #d35400;
    --color-primary-hover: #b8480e;
    --color-primary-gradient: linear-gradient(135deg, #ef8a3d, #d35400);
    --color-primary-gradient-hover: linear-gradient(135deg, #e2701c, #b8480e);
    --color-primary-contrast: #ffffff;
    --color-error-bg: rgba(214, 40, 40, 0.08);
    --color-error-border: rgba(214, 40, 40, 0.3);
    --color-error-text: #b91c1c;
    --color-loading-bg: rgba(211, 84, 0, 0.1);
    --color-loading-text: #b8480e;
    --color-warning-bg: rgba(161, 129, 12, 0.08);
    --color-warning-border: rgba(161, 129, 12, 0.3);
    --color-warning-text: #8a6d0a;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background:
    radial-gradient(circle at 12% 8%, rgba(242, 160, 84, 0.05), transparent 35%),
    radial-gradient(circle at 88% 85%, var(--color-bg-highlight), transparent 40%),
    var(--color-bg);
  background-attachment: fixed;
  color: var(--color-text);
  line-height: 1.5;
}

.page {
  max-width: 1240px;
  margin: 0 auto;
  padding: var(--spacing-5) var(--spacing-4) var(--spacing-6);
}

.page-header {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--spacing-1) var(--spacing-3);
  margin-bottom: var(--spacing-4);
}

.page-header h1 {
  margin: 0;
  font-size: 1.6rem;
}

.page-header h1 .accent {
  color: var(--color-primary);
}

.subtitle {
  margin: 0;
  color: var(--color-text-muted);
}

/* ---------------- Mode toggle ---------------- */

.mode-toggle {
  display: flex;
  gap: var(--spacing-1);
  margin-bottom: var(--spacing-5);
  border-bottom: 1px solid var(--color-border);
  overflow-x: auto;
  scrollbar-width: none;
}

.mode-btn {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: var(--spacing-3) var(--spacing-4);
  margin-bottom: -1px;
  font-size: 0.95rem;
  font-weight: 600;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: 0;
}

.mode-btn:hover {
  color: var(--color-text);
}

.mode-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.mode-panel {
  display: none;
}

.mode-panel.active {
  display: block;
}

/* ---------------- Panel layout: form beside its result ----------------
   Stacked on narrow screens; side by side once there's room, with the
   result column sticky so a render is visible without scrolling back up. */

.panel-layout {
  display: grid;
  gap: var(--spacing-5);
}

.panel-intro {
  margin: 0 0 var(--spacing-4);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

@media (min-width: 980px) {
  .panel-layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }

  .panel-output {
    position: sticky;
    top: var(--spacing-4);
    max-height: calc(100vh - var(--spacing-6));
    overflow-y: auto;
  }

  /* Empty-state placeholder; ::before content doesn't break :empty. */
  .panel-output .result-box:empty {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 240px;
    background: none;
    border-style: dashed;
  }

  .panel-output .result-box:empty::before {
    content: "Rendered chart appears here";
    color: var(--color-text-muted);
    font-size: 0.9rem;
  }
}

/* ---------------- Quick-start examples ---------------- */

.quick-examples {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-4);
}

.quick-examples-label {
  font-variant: small-caps;
  letter-spacing: 0.03em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.example-btn {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: var(--spacing-1) var(--spacing-3);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  cursor: pointer;
}

.example-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ---------------- Form structure ---------------- */

fieldset {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  padding: var(--spacing-4);
  margin: 0 0 var(--spacing-4);
}

legend {
  padding: 0 var(--spacing-2);
  font-weight: 600;
  color: var(--color-text);
}

details.advanced {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  padding: var(--spacing-3) var(--spacing-4);
  margin: 0 0 var(--spacing-4);
}

details.advanced summary {
  font-weight: 600;
  cursor: pointer;
}

details.advanced summary::marker {
  color: var(--color-primary);
}

details.advanced[open] summary {
  margin-bottom: var(--spacing-3);
}

.summary-note {
  margin-left: var(--spacing-2);
  font-weight: normal;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* Consecutive collapsible sections share one card, divided by rules,
   instead of each being its own boxed card. */
.disclosures {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  margin: 0 0 var(--spacing-4);
}

.disclosures > details.advanced {
  border: none;
  border-radius: 0;
  background: none;
  margin: 0;
}

.disclosures > details.advanced + details.advanced {
  border-top: 1px solid var(--color-border);
}

/* Inline "more info" toggle for long reference hints. */
.hint-details {
  margin-top: var(--spacing-1);
}

.hint-details summary {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  cursor: pointer;
  width: fit-content;
}

.hint-details summary:hover {
  color: var(--color-primary);
}

.field {
  margin-bottom: var(--spacing-4);
}

.field:last-child {
  margin-bottom: 0;
}

/* Short fields side by side; wraps to one column on narrow screens. */
.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(125px, 1fr));
  gap: var(--spacing-3) var(--spacing-4);
  margin-bottom: var(--spacing-4);
}

.field-grid-wide {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}

.field-grid:last-child {
  margin-bottom: 0;
}

.field-grid .field {
  margin-bottom: 0;
}

.fieldset-intro {
  margin: 0 0 var(--spacing-3);
}

.field-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2) var(--spacing-5);
  align-items: center;
}

details.advanced .field-row + .hint {
  margin-top: var(--spacing-2);
}

label {
  display: block;
  font-variant: small-caps;
  letter-spacing: 0.03em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-1);
}

.required {
  color: var(--color-error-text);
}

input[type="text"],
input[type="number"],
textarea,
select {
  width: 100%;
  padding: var(--spacing-2) var(--spacing-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface-input);
  color: var(--color-text);
  font-size: 0.95rem;
  font-family: inherit;
}

input[type="text"]::placeholder,
input[type="number"]::placeholder,
textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.7;
}

textarea {
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
}

input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

input[type="checkbox"],
input[type="radio"] {
  accent-color: var(--color-primary);
}

.checkbox-label,
.radio-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-variant: normal;
  letter-spacing: normal;
  font-weight: normal;
  margin-bottom: 0;
  cursor: pointer;
  color: var(--color-text);
}

/* Toned down a pinch from the full-brightness text color above -- these
   (Label pitches/Label tuning) read a little harsh at full white next to
   everything else's more muted palette. */
.checkbox-label {
  opacity: 0.82;
}

.checkbox-label input,
.radio-label input {
  margin: 0;
}

.hint {
  margin: var(--spacing-1) 0 0;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.hint code {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 1px 4px;
  font-size: 0.8rem;
}

/* ---------------- Document preview ---------------- */

.document-preview-text {
  margin: var(--spacing-2) 0 0;
  padding: var(--spacing-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.82rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 320px;
  overflow-y: auto;
}

/* ---------------- JSON-or-per-string fields ---------------- */

.field-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-1);
}

.field-label-row label {
  margin-bottom: 0;
}

/* Segmented radio control: SVG/PNG, JSON/Per string. The radio itself is
   visually hidden but still focusable and keyboard-operable. */
.segmented {
  display: inline-flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface-input);
  overflow: hidden;
}

.segmented label {
  position: relative;
  margin: 0;
  padding: var(--spacing-2) var(--spacing-3);
  font-variant: normal;
  letter-spacing: normal;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  cursor: pointer;
}

.segmented label + label {
  border-left: 1px solid var(--color-border);
}

.segmented input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.segmented label:hover {
  color: var(--color-text);
}

.segmented label:has(input:checked) {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
}

.segmented label:has(input:focus-visible) {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

.segmented-sm label {
  padding: 2px var(--spacing-2);
  font-size: 0.75rem;
}

.select-sm {
  width: auto;
  padding: 2px var(--spacing-2);
  font-size: 0.8rem;
}

.per-string-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.per-string-input {
  width: 3.5rem;
}

/* Note classes tend to hold longer text (CSS class names) than string
   labels or a single finger digit, so give those inputs more room. */
.per-string-grid-wide .per-string-input {
  width: auto;
  min-width: 7ex;
}

.per-string-input label {
  text-align: center;
  font-size: 0.72rem;
  margin-bottom: 2px;
}

.per-string-input input {
  text-align: center;
  padding: var(--spacing-2) var(--spacing-1);
}

/* ---------------- Scale chart: marker rows ---------------- */

/* Header and rows share one column template so they stay aligned; the
   numeric columns are narrower and Shape gets room for its option text. */
.marker-row-header,
.marker-row {
  display: grid;
  grid-template-columns: 0.8fr 0.8fr 1fr 1fr 0.8fr 1.4fr 1.75rem;
  gap: var(--spacing-2);
  align-items: center;
  margin-bottom: var(--spacing-2);
}

.marker-row-header {
  font-variant: small-caps;
  letter-spacing: 0.03em;
  font-size: 0.72rem;
  color: var(--color-text-muted);
  text-align: center;
}

.marker-row select,
.marker-row input {
  min-width: 0;
  padding-left: var(--spacing-2);
  padding-right: var(--spacing-1);
}

.marker-row-remove {
  flex: 0 0 auto;
  width: 1.75rem;
  height: 1.75rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface-input);
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}

.marker-row-remove:hover {
  color: var(--color-error-text);
  border-color: var(--color-error-border);
}

.btn-secondary {
  background: var(--color-surface-input);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-2) var(--spacing-4);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}

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

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

.btn-sm {
  padding: var(--spacing-1) var(--spacing-3);
  font-size: 0.85rem;
}

.result-extras {
  margin-top: var(--spacing-3);
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-3);
}

.actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-3);
}

/* Output format sits at the left; the buttons group at the right. */
.actions .format-toggle {
  margin-right: auto;
}

.share-status {
  text-align: right;
  word-break: break-all;
}

button[type="submit"] {
  background: var(--color-primary-gradient);
  color: var(--color-primary-contrast);
  border: none;
  border-radius: var(--radius);
  padding: var(--spacing-3) var(--spacing-5);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

button[type="submit"]:hover:not(:disabled) {
  background: var(--color-primary-gradient-hover);
}

button[type="submit"]:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

/* ---------------- Status boxes ---------------- */

.hidden {
  display: none !important;
}

.error-box {
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  color: var(--color-error-text);
  border-radius: var(--radius);
  padding: var(--spacing-3) var(--spacing-4);
  margin-bottom: var(--spacing-4);
  font-weight: 500;
}

.loading-box {
  background: var(--color-loading-bg);
  color: var(--color-loading-text);
  border-radius: var(--radius);
  padding: var(--spacing-3) var(--spacing-4);
  margin-bottom: var(--spacing-4);
  font-weight: 500;
}

.warning-box {
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  color: var(--color-warning-text);
  border-radius: var(--radius);
  padding: var(--spacing-3) var(--spacing-4);
  margin-bottom: var(--spacing-4);
  font-weight: 500;
}

.warning-box:empty {
  display: none;
}

/* Deliberately NOT dark, unlike the rest of this theme: the rendered
   chart's default (no custom --stylesheet) draws black strings/dots/text
   on a transparent background, meant to sit on a light page -- a dark
   result box would make an unstyled chart nearly invisible. A custom
   stylesheet can still override .chord-chart-background to go dark on
   purpose; this is just the sane default. */
.result-box {
  background: #f5f0e8;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  min-height: 0;
  padding: var(--spacing-4);
  overflow-x: auto;
}

.result-box:empty {
  display: none;
}

.result-box svg,
.result-box img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

/* ---------------- Responsive ---------------- */

@media (max-width: 480px) {
  .page {
    padding: var(--spacing-4) var(--spacing-3);
  }

  .mode-btn {
    font-size: 0.9rem;
    padding: var(--spacing-2) var(--spacing-3);
  }

  .actions .format-toggle {
    margin-right: 0;
  }

  .actions .btn-secondary {
    flex: 1 1 auto;
  }

  button[type="submit"] {
    width: 100%;
  }

  .marker-row-header {
    display: none; /* column alignment breaks once rows wrap below */
  }

  .marker-row {
    grid-template-columns: repeat(3, minmax(0, 1fr)) 1.75rem;
    padding-bottom: var(--spacing-2);
    border-bottom: 1px solid var(--color-border);
  }

  /* String/Fret/Label on the first line, Class/Finger/Shape on the
     second, remove button spanning both at the end. */
  .marker-row > :nth-child(n + 4) {
    grid-row: 2;
  }

  .marker-row > .marker-row-remove {
    grid-column: 4;
    grid-row: 1 / span 2;
  }
}