/* =========================
   Design Tokens
   ========================= */
:root {
  /* Color */
  --bg: rgb(240 240 240);
  --surface: rgb(255 255 255);
  --surface-muted: rgb(240 240 240 / 0.8);
  --text: rgb(34 34 34);
  --text-strong: rgb(51 51 51);
  --text-muted: rgb(85 85 85);
  --border: rgb(220 220 220);
  --border-input: rgb(207 207 207);

  /* Base palette */
  --white: rgb(255 255 255);
  --black: rgb(0 0 0);

  /* Header */
  --header-bg: rgb(255 255 255 / 0.95);
  --text-shadow: rgb(170 170 170);

  /* Brand (header actions) */
  --primary: rgb(37 99 235);
  --primary-600: rgb(29 78 216);
  --primary-700: rgb(27 70 198);
  --primary-border: var(--primary-700);
  --on-primary: rgb(255 255 255);

  /* Elevation */
  --shadow-1: 0 1px 2px rgb(0 0 0 / 0.04), 0 3px 12px rgb(0 0 0 / 0.06);
  --shadow-header: 0 2px 10px rgb(0 0 0 / 0.1);

  /* Radius */
  --radius: 10px;
  --radius-sm: 6px;

  /* Spacing */
  --pad-x: 30px;
  --pad-y: 20px;
  --gap-xs: 6px;
  --gap-sm: 8px;
  --gap-md: 12px;
  --gap-lg: 18px;

  /* Forms */
  --label-width: 130px;
  --input-max: 260px;
  --input-h: 32px;
  --axis-swatch: 56px;
  --header-input-w: 72px;
  --input-bg: var(--surface);

  /* Layout */
  --z-header: 1000;

  /* Breakpoints */
  --bp-2col: 1400px;
  --bp-1col: 800px;

  /* Toggles */
  --toggle-fg: rgb(102 102 102);
  --toggle-hover-bg: rgb(0 0 0 / 0.1);

  /* Actions (legacy green draw button) */
  --action-green: rgb(76 175 80);
  --action-green-hover: rgb(69 160 73);
  --on-solid: rgb(255 255 255);
}

/* Optional dark theme scaffold */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: rgb(20 20 20);
    --surface: rgb(28 28 28);
    --surface-muted: rgb(32 32 32 / 0.8);
    --text: rgb(230 230 230);
    --text-strong: rgb(242 242 242);
    --text-muted: rgb(189 189 189);
    --border: rgb(43 43 43);
    --border-input: rgb(58 58 58);
    --primary: rgb(59 130 246);
    --primary-600: rgb(37 99 235);
    --primary-700: rgb(29 78 216);
    --header-bg: rgb(28 28 28 / 0.95);
    --toggle-hover-bg: rgb(255 255 255 / 0.08);
  }
}

/* =========================
   Base / Resets
   ========================= */
*,
*::before,
*::after { box-sizing: border-box; }

html, body { height: 100%; }

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  margin: 0;
}

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

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* =========================
   Header / Controls Shell
   ========================= */
#controls {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: var(--header-bg);
  border-bottom: 2px solid var(--border);
  box-shadow: var(--shadow-header);
  backdrop-filter: blur(5px);
  width: 100%;
}

.header-controls { margin-bottom: 0; text-align: left; }

.controls-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px var(--pad-x);
  background-color: var(--surface-muted);
}

.title-section {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.main-title {
  font-size: 32px;
  color: var(--text-strong);
  margin: 0;
  text-shadow: 1px 1px var(--text-shadow);
}

.subtitle {
  font-size: 16px;
  color: var(--text-muted);
  margin: 2px 0 0 0;
  font-style: italic;
}

/* Primary actions (top-right) */
.header-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-left: 20px;
}

.header-actions .primary-action {
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--primary-border);
  background-color: var(--primary);
  color: var(--on-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  min-width: 150px;
  line-height: 1.1;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.05);
}
.header-actions .primary-action:hover { background-color: var(--primary-600); }
.header-actions .primary-action:active { background-color: var(--primary-700); }

/* Header lattice (center strip) */
.header-lattice {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: auto var(--header-input-w) auto var(--header-input-w) auto var(--header-input-w);
  align-items: center;
  justify-content: center;
  column-gap: var(--gap-md);
}
.header-lattice label { font-weight: 600; color: var(--text-strong); }
.header-lattice input[type="number"] { width: var(--header-input-w); }

/* Toggle */
.toggle-btn {
  background: none;
  border: none;
  font-size: 24px;
  font-weight: bold;
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 4px;
  color: var(--toggle-fg);
  min-width: 40px;
}
.toggle-btn:hover { background-color: var(--toggle-hover-bg); }

/* =========================
   Controls Grid (cards)
   ========================= */
.controls-content {
  padding: var(--pad-y) var(--pad-x);
  transition: all 0.3s ease;
  display: grid;
  grid-template-columns: repeat(4, minmax(300px, 1fr));
  grid-auto-flow: row dense;
  gap: var(--gap-lg) 22px;
}
.controls-content.collapsed { display: none; }

/* Card */
fieldset {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px 18px;
  margin: 0;
  background: var(--surface);
  box-shadow: var(--shadow-1);
}
legend {
  font-weight: 600;
  color: var(--text-strong);
  padding: 0 10px;
  margin-left: 6px;
  font-size: 18px;
}

/* Old green Draw style only when used in the legacy row */
.main-actions { grid-column: 1 / -1; text-align: center; padding-top: 10px; }
.main-actions #drawButton {
  padding: 12px 30px; font-size: 18px; font-weight: bold;
  background-color: var(--action-green); color: var(--on-solid); border: none; border-radius: 5px; cursor: pointer;
  transition: background-color 0.3s;
}
.main-actions #drawButton:hover { background-color: var(--action-green-hover); }

/* Label/Input alignment inside cards */
fieldset .control-group {
  display: grid;
  grid-template-columns: var(--label-width) 1fr;
  align-items: center;
  column-gap: var(--gap-sm); /* control spacing here */
  row-gap: var(--gap-sm);
}
fieldset .control-group label {
  justify-self: end;
  font-weight: 500;
  color: var(--text);
}

/* Align checkbox next to color input tightly */
fieldset .control-group input[type="color"],
fieldset .control-group input[type="checkbox"] {
  vertical-align: middle;
}
fieldset .control-group input[type="color"] + input[type="checkbox"] {
  margin-left: var(--gap-xs);
}

/* Inline pair: color + checkbox in same grid cell */
.inline-inputs {
  display: inline-flex;
  align-items: center;
  gap: var(--gap-xs);
}

/* =========================
   Form Controls
   ========================= */
input[type="number"],
select {
  width: 100%;
  max-width: var(--input-max);
  height: var(--input-h);
  padding: 6px 8px;
  border: 1px solid var(--border-input);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  color: var(--text);
}
textarea {
  width: 100%;
  max-width: var(--input-max);
  min-height: 60px;
  padding: 6px 8px;
  border: 1px solid var(--border-input);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  color: var(--text);
  resize: vertical;
}
input[type="color"] {
  width: var(--axis-swatch);
  height: var(--input-h);
  padding: 0;
  border: 1px solid var(--border-input);
  border-radius: var(--radius-sm);
}
.axis-color { width: var(--axis-swatch); margin-right: 0; }

/* =========================
   Workspace: overlays left, canvas right
   ========================= */
.workspace {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  padding: 10px var(--pad-x) 30px;
}

.overlay-sidebar {
  width: 340px;
  min-width: 300px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  padding: 12px 14px 16px;
}
.overlay-header {
  display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px;
}
.overlay-list { display: flex; flex-direction: column; gap: 10px; }

.canvas-wrap {
  flex: 1;
  display: flex;
  justify-content: flex-end; /* right-justify canvas */
  padding-right: var(--pad-x);
  overflow: auto;
}
#tonnetzCanvas {
  margin: 20px 0 30px 0;
  display: block;
  border: 1px solid var(--black);
  background-color: var(--surface);
}

/* =========================
   Responsive
   ========================= */
@media (max-width: 1400px) {
  .controls-content { grid-template-columns: repeat(2, minmax(300px, 1fr)); }
}
@media (max-width: 800px) {
  .controls-content { grid-template-columns: 1fr; }
  .header-lattice {
    grid-template-columns: auto var(--header-input-w);
    row-gap: var(--gap-xs);
  }
}