/* ═══ Tokens ════════════════════════════════════════ */
:root {
  --bg:          #f0f1f5;
  --surface:     #ffffff;
  --surface2:    #f7f8fa;
  --border:      #e3e5ea;
  --border2:     #c8cbd4;
  --text:        #0f1117;
  --muted:       #5f6472;
  --faint:       #9ca0ad;
  --accent:      #5b4eff;
  --accent-lt:   #eeecff;
  --accent-dk:   #4033d4;
  --accent-glow: rgba(91,78,255,.22);

  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 26px;
  --sidebar-w: 288px;

  --sh-card: 0 2px 8px rgba(0,0,0,.06), 0 0 0 1px rgba(0,0,0,.04);
  --sh-raise: 0 8px 32px rgba(0,0,0,.10), 0 2px 8px rgba(0,0,0,.06);
}

body.theme-dark {
  --bg:          #0f1117;
  --surface:     #171b24;
  --surface2:    #1d2330;
  --border:      #2b3343;
  --border2:     #404b60;
  --text:        #eef2f8;
  --muted:       #b1bac9;
  --faint:       #8691a6;
  --accent:      #8d83ff;
  --accent-lt:   #262041;
  --accent-dk:   #7568ff;
  --accent-glow: rgba(141,131,255,.30);

  --sh-card: 0 2px 12px rgba(0,0,0,.22), 0 0 0 1px rgba(255,255,255,.03);
  --sh-raise: 0 16px 40px rgba(0,0,0,.38), 0 4px 12px rgba(0,0,0,.24);
}

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

body {
  font-family: 'Nunito', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  min-height: 100dvh;
  transition: background .2s ease, color .2s ease;
}

/* ═══ Shell ═════════════════════════════════════════ */
.shell {
  display: flex;
  min-height: 100dvh;
}

/* ═══ Sidebar ═══════════════════════════════════════ */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 22px 16px 36px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  overflow-y: auto;
  position: sticky;
  top: 0;
  height: 100dvh;
  transition: background .2s ease, border-color .2s ease;
}

/* Brand */
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}
.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--r-md);
  background: var(--accent-lt);
  display: grid;
  place-items: center;
  font-size: 19px;
  flex-shrink: 0;
  box-shadow: var(--sh-card);
}
.brand-name {
  font-size: 14px;
  font-weight: 900;
  color: var(--text);
  letter-spacing: -.1px;
}
.brand-sub {
  font-size: 11px;
  font-weight: 700;
  color: var(--faint);
  margin-top: 1px;
}

/* Theme toggle */
.theme-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--r-md);
  border: 1.5px solid var(--border);
  background: var(--surface2);
}

.theme-toggle-label {
  font-size: 13px;
  font-weight: 800;
  color: var(--text);
}

.theme-toggle {
  width: 54px;
  height: 30px;
  border: 0;
  border-radius: 999px;
  background: var(--border2);
  padding: 3px;
  cursor: pointer;
  position: relative;
  transition: background .18s ease;
  flex-shrink: 0;
}

.theme-toggle-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  display: block;
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
  transform: translateX(0);
  transition: transform .18s ease;
}

body.theme-dark .theme-toggle {
  background: var(--accent);
}

body.theme-dark .theme-toggle-thumb {
  transform: translateX(24px);
}

/* Group */
.group { display: flex; flex-direction: column; gap: 8px; }

.group-label {
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 2px;
}

/* Fields */
.field { display: flex; flex-direction: column; gap: 4px; }

.field-label {
  font-size: 12px;
  font-weight: 800;
  color: var(--muted);
}

.input {
  background: var(--surface2);
  border: 1.5px solid var(--border);
  border-radius: var(--r-sm);
  color: var(--text);
  padding: 8px 10px;
  font-size: 13px;
  font-family: inherit;
  font-weight: 700;
  outline: none;
  width: 100%;
  transition: border-color .15s, box-shadow .15s, background .15s;
}

.input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.row-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 7px;
}

/* Pill checkboxes */
.pill-check {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--border);
  background: var(--surface2);
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  transition: border-color .15s, background .15s;
  user-select: none;
}

.pill-check:hover {
  border-color: var(--border2);
}

.pill-check input { display: none; }

.checkmark {
  width: 18px;
  height: 18px;
  border-radius: 6px;
  border: 2px solid var(--border2);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  transition: background .15s, border-color .15s;
  background: var(--surface);
}

.checkmark::after {
  content: '';
  width: 5px;
  height: 9px;
  border: 2px solid #fff;
  border-top: none;
  border-left: none;
  transform: rotate(45deg) translateY(-1px);
  opacity: 0;
  transition: opacity .1s;
}

.pill-check input:checked ~ .checkmark {
  background: var(--accent);
  border-color: var(--accent);
}

.pill-check input:checked ~ .checkmark::after {
  opacity: 1;
}

/* Sliders */
.slider-list {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--r-sm);
  background: var(--surface2);
  border: 1.5px solid var(--border);
}

.slider-row span {
  font-size: 12px;
  font-weight: 800;
  color: var(--muted);
  width: 70px;
  flex-shrink: 0;
}

input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--border2);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2.5px solid #fff;
  box-shadow: 0 0 0 2px var(--accent-glow);
  transition: transform .1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.25);
}

/* Colors */
.color-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.color-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  font-weight: 800;
  color: var(--muted);
}

.color-field input[type="color"] {
  width: 100%;
  height: 38px;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--border);
  padding: 3px;
  background: var(--surface2);
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 16px;
  border-radius: var(--r-md);
  font-family: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  border: 1.5px solid transparent;
  letter-spacing: .1px;
  transition: all .15s;
  white-space: nowrap;
}

.btn:active { transform: scale(.97); }

.btn-ghost {
  background: var(--surface2);
  border-color: var(--border);
  color: var(--muted);
}

.btn-ghost:hover {
  border-color: var(--border2);
  color: var(--text);
}

.btn-outline {
  background: transparent;
  border-color: var(--border2);
  color: var(--muted);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-lt);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 2px 10px var(--accent-glow);
}

.btn-primary:hover {
  background: var(--accent-dk);
  border-color: var(--accent-dk);
  box-shadow: 0 4px 18px rgba(91,78,255,.38);
}

.sidebar-btns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

/* Debug */
.debug {
  font-size: 12px;
  color: var(--muted);
}

.debug summary {
  cursor: pointer;
  padding: 5px 0;
  font-weight: 700;
}

.debug pre {
  margin-top: 8px;
  padding: 10px;
  border-radius: var(--r-sm);
  background: var(--surface2);
  border: 1px solid var(--border);
  overflow: auto;
  max-height: 200px;
  font-size: 11px;
  color: var(--muted);
}

/* ═══ Main ══════════════════════════════════════════ */
.main {
  flex: 1;
  padding: 32px 36px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
}

/* ═══ Diagram unit ══════════════════════════════════ */
.diagram-unit {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: fit-content;
  max-width: 100%;
}

.chord-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
}

.chord-name-block {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.chord-eyebrow {
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--faint);
}

.chord-name {
  font-size: 52px;
  font-weight: 1000;
  color: var(--accent);
  line-height: 1;
  letter-spacing: -2px;
  min-width: 48px;
  position: relative;
  top: 4px;
}

.export-btns {
  display: flex;
  gap: 8px;
  align-items: center;
}

.mount-shell {
  overflow: auto;
  border-radius: var(--r-xl);
}

.mount {
  display: inline-block;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--r-xl);
  padding: 16px;
  box-shadow: var(--sh-raise);
  cursor: crosshair;
  vertical-align: top;
}

.mount svg {
  display: block;
  border-radius: 12px;
  max-width: none !important;
}

@media (max-width: 800px) {
  .shell { flex-direction: column; }

  .sidebar {
    width: 100%;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .main { padding: 20px 16px; }

  .chord-name { font-size: 38px; }

  .chord-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}