/* =========================================================================
   JazzVis — Harmony Visualizer
   Design tokens: warm manuscript paper, ink-brown text, three accents
   pulled from JazzVis's own chord-function palette (red/blue/gold).
   ========================================================================= */

:root {
  --paper:       #F6F1E7;
  --paper-shade: #ECE4D2;
  --paper-deep:  #E2D8C2;
  --ink:         #2B2420;
  --ink-soft:    #6B6055;
  --line:        #D8CDB8;

  --accent-red:  #E2615C;
  --accent-blue: #5A8FE0;
  --accent-gold: #E0BE55;

  --font-display: 'Fraunces', serif;
  --font-body:    'IBM Plex Sans', system-ui, sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;

  --radius: 10px;
  --sidebar-width: 200px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
}

/* -------------------------------------------------------------------- */
/* Top bar                                                                */
/* -------------------------------------------------------------------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 28px;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  font-family: var(--font-display);
  font-size: 30px;
  line-height: 1;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-text h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  margin: 0;
  letter-spacing: 0.01em;
}

.brand-text p {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--ink-soft);
}

.brand-text code {
  font-family: var(--font-mono);
  background: var(--paper-shade);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 12px;
}

.song-picker {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.song-picker label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  font-weight: 500;
}

.combobox {
  position: relative;
}

.song-search {
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-shade);
  color: var(--ink);
  min-width: 220px;
}

.song-search:focus {
  outline: 2px solid var(--accent-blue);
  outline-offset: 1px;
}

.song-list {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  margin: 0;
  padding: 4px;
  list-style: none;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  max-height: 260px;
  overflow-y: auto;
  z-index: 20;
  box-shadow: 0 6px 16px rgba(43, 36, 32, 0.12);
}

.song-list[hidden] { display: none; }

.song-list li {
  padding: 7px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-list li:hover,
.song-list li.active {
  background: var(--paper-shade);
}

.song-list li mark {
  background: transparent;
  color: var(--accent-red);
  font-weight: 600;
}

.song-list li.empty {
  color: var(--ink-soft);
  cursor: default;
  font-family: var(--font-body);
  font-style: italic;
}

.song-list li.empty:hover { background: none; }

.upload-btn {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  padding: 8px 14px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  cursor: pointer;
  background: transparent;
  color: var(--ink);
  transition: background 0.15s ease, color 0.15s ease;
  text-transform: none;
  letter-spacing: normal;
}

.upload-btn:hover {
  background: var(--ink);
  color: var(--paper);
}

/* -------------------------------------------------------------------- */
/* App layout: narrow sidebar + wide chart area                          */
/* -------------------------------------------------------------------- */

.app-layout {
  display: flex;
  align-items: flex-start;
}

.sidebar {
  width: var(--sidebar-width);
  flex: 0 0 var(--sidebar-width);
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding: 20px 16px;
  background: var(--paper-shade);
  border-right: 1px solid var(--line);
  min-height: calc(100vh - 81px);
}

.control-group {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}

.control-group h2 {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  margin: 0;
  text-align: center;
}

.full-width { width: 100%; }

@media (max-width: 760px) {
  .app-layout { flex-direction: column; }
  .sidebar {
    width: 100%;
    flex: 0 0 auto;
    flex-direction: row;
    flex-wrap: wrap;
    border-right: none;
    border-bottom: 1px solid var(--line);
    min-height: auto;
  }
  .control-group { width: 160px; }
}

/* -------------------------------------------------------------------- */
/* Key wheels                                                             */
/* -------------------------------------------------------------------- */

.wheel-wrap.collapsed {
  display: none;
}

.wheel {
  width: 100%;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
}

.wheel.small {
  width: 80%;
}

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

.wheel .slice {
  fill: var(--paper);
  stroke: var(--paper-shade);
  stroke-width: 2px;
  cursor: pointer;
  transition: fill 0.12s ease;
}

.wheel .slice:hover {
  fill: var(--paper-deep);
}

.wheel .slice.selected {
  fill: var(--accent-red);
}

.wheel .slice-label {
  font-family: var(--font-mono);
  font-size: 12px;
  fill: var(--ink);
  pointer-events: none;
}

.wheel text.slice-label.on-selected {
  fill: var(--paper);
  font-weight: 500;
}

.wheel .hub {
  fill: var(--ink);
}

.wheel .hub-text {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  fill: var(--paper);
  pointer-events: none;
}

/* -------------------------------------------------------------------- */
/* Buttons & toggles                                                      */
/* -------------------------------------------------------------------- */

.ghost-btn {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.ghost-btn:hover {
  border-color: var(--ink);
}

.ghost-btn.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.ghost-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.primary-btn {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  padding: 10px 22px;
  border: none;
  border-radius: var(--radius);
  background: var(--accent-red);
  color: var(--paper);
  cursor: pointer;
  transition: filter 0.15s ease;
}

.primary-btn:hover { filter: brightness(1.06); }
.primary-btn:disabled {
  opacity: 0.55;
  cursor: progress;
}

/* Vertical segmented control (Display toggle) */
.segmented {
  display: flex;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: opacity 0.15s ease;
}

.segmented.vertical {
  flex-direction: column;
}

.segmented.disabled {
  opacity: 0.45;
  pointer-events: none;
}

.seg-btn {
  flex: 1;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  padding: 10px 12px;
  border: none;
  background: var(--paper);
  color: var(--ink-soft);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.segmented.vertical .seg-btn + .seg-btn { border-top: 1px solid var(--line); }

.seg-btn.active {
  background: var(--ink);
  color: var(--paper);
}

/* -------------------------------------------------------------------- */
/* Bars-per-row input                                                     */
/* -------------------------------------------------------------------- */

.bpl-input-wrap {
  position: relative;
}

.bpl-input {
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 8px 34px 8px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  width: 100%;
  text-align: center;
}

.bpl-input:focus {
  outline: 2px solid var(--accent-blue);
  outline-offset: 1px;
}

.bpl-enter {
  position: absolute;
  top: 50%;
  right: 4px;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--ink-soft);
  font-size: 14px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.bpl-enter:hover {
  background: var(--paper-shade);
  color: var(--ink);
}

/* -------------------------------------------------------------------- */
/* Status message                                                         */
/* -------------------------------------------------------------------- */

.status {
  min-height: 18px;
  font-size: 12px;
  margin: 0;
  text-align: center;
}

.status.error { color: var(--accent-red); }
.status.ok    { color: var(--ink-soft); }

.reset-group {
  margin-top: auto;
}

/* -------------------------------------------------------------------- */
/* Output                                                                 */
/* -------------------------------------------------------------------- */

.chart-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 24px 28px 12px;
  min-width: 0;
}

.chart-frame {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  overflow: auto;
  min-height: 80vh;
}

.chart-frame img {
  max-width: 100%;
  width: 100%;
  height: auto;
  display: block;
}

.chart-placeholder {
  text-align: center;
  color: var(--ink-soft);
}

.placeholder-glyph {
  font-family: var(--font-display);
  font-size: 56px;
  display: block;
  margin-bottom: 8px;
  opacity: 0.5;
}

.chart-placeholder p { margin: 4px 0; }
.placeholder-sub { font-size: 13px; }

/* -------------------------------------------------------------------- */
/* Help sections (collapsible)                                            */
/* -------------------------------------------------------------------- */

.help {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 4px 22px;
}

.help summary {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
}

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

.help summary::before {
  content: '▸';
  display: inline-block;
  width: 1em;
  color: var(--ink-soft);
  transition: transform 0.15s ease;
}

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

.help dl {
  margin: 0 0 16px;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 6px 18px;
}

.help dt {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 14px;
  padding-top: 2px;
}

.help dd {
  margin: 0 0 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.help p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

.help code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--paper-shade);
  padding: 1px 5px;
  border-radius: 4px;
}

.help pre {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  background: var(--paper-shade);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin: 0 0 14px;
  overflow-x: auto;
}

.help pre code {
  background: none;
  padding: 0;
}

@media (max-width: 640px) {
  .help dl { grid-template-columns: 1fr; }
  .help dt { padding-top: 10px; }
}

/* -------------------------------------------------------------------- */
/* Footer                                                                 */
/* -------------------------------------------------------------------- */

.footer {
  text-align: center;
  font-size: 12px;
  color: var(--ink-soft);
  padding: 0 28px 28px;
}

.footer-citation {
  margin-top: 6px;
  font-size: 11px;
  color: var(--ink-soft);
}

.footer-link {
  color: var(--ink-soft);
  text-decoration: underline;
  text-underline-offset: 2px;
  margin-left: 6px;
  white-space: nowrap;
}

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