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

html, body {
  height: 100%;
  overflow: hidden;
}

/* ============================================================
   CSS Custom Properties — Squaresmile Dark Palette
   ============================================================ */
:root {
  --bg-primary:       #0f0f0f;
  --bg-surface:       #1a1d22;
  --bg-elevated:      #1e2128;
  --bg-hover:         #252932;

  --text-primary:     #f0ece4;
  --text-muted:       #8a8a8a;
  --text-faint:       #4a4a4a;

  --accent-amber:     #e8a838;
  --accent-amber-dim: rgba(232, 168, 56, 0.15);
  --accent-amber-glow:0 0 16px rgba(232, 168, 56, 0.35);
  --accent-teal:      #3a8c8c;

  --color-success:    #47c78a;
  --color-error:      #ef5b5b;

  --border:           rgba(255, 255, 255, 0.07);
  --border-active:    rgba(232, 168, 56, 0.5);

  --transition:       0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --radius:           8px;
  --radius-sm:        5px;

  --font-heading:     'Playfair Display', Georgia, serif;
  --font-body:        'DM Sans', system-ui, sans-serif;
  --font-mono:        'DM Mono', 'IBM Plex Mono', monospace;

  --sidebar-width:    176px;
  --toolbar-height:   52px;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 13px;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

/* Screen-reader only utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   Layout
   ============================================================ */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.app-layout {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.main-area {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

/* ============================================================
   Sidebar
   ============================================================ */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 10;
}

.sidebar__header {
  padding: 14px 12px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar__logo {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--accent-amber);
  text-transform: uppercase;
}

.sidebar__palette {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 8px 0 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-hover) transparent;
}

.sidebar__palette::-webkit-scrollbar {
  width: 4px;
}

.sidebar__palette::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar__palette::-webkit-scrollbar-thumb {
  background: var(--bg-hover);
  border-radius: 2px;
}

/* Category heading */
.palette-category {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 10px 12px 4px;
}

/* Palette item */
.palette-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  cursor: grab;
  border-radius: 0;
  transition: background var(--transition), color var(--transition);
  user-select: none;
  -webkit-user-select: none;
}

.palette-item:hover {
  background: var(--bg-hover);
  color: var(--accent-amber);
}

.palette-item:active {
  cursor: grabbing;
}

.palette-item__icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.palette-item:hover .palette-item__icon {
  border-color: var(--border-active);
  box-shadow: var(--accent-amber-glow);
}

.palette-item__icon svg {
  width: 18px;
  height: 18px;
  pointer-events: none;
}

.palette-item__label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  transition: color var(--transition);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.palette-item:hover .palette-item__label {
  color: var(--text-primary);
}

/* ============================================================
   Toolbar
   ============================================================ */
.toolbar {
  height: var(--toolbar-height);
  min-height: var(--toolbar-height);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  flex-shrink: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.toolbar::-webkit-scrollbar {
  display: none;
}

.toolbar__left {
  flex-shrink: 0;
}

.toolbar__templates {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.toolbar__actions {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  flex-shrink: 0;
}

.toolbar__label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-faint);
  white-space: nowrap;
  margin-right: 2px;
}

.toolbar__divider {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 4px;
  flex-shrink: 0;
}

/* Band name input */
.band-name-input {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 5px 10px;
  width: 180px;
  transition: border-color var(--transition);
  outline: none;
}

.band-name-input:focus {
  border-color: var(--border-active);
}

.band-name-input::placeholder {
  color: var(--text-faint);
}

/* Zoom display */
.zoom-display {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  min-width: 38px;
  text-align: center;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
  outline: none;
  white-space: nowrap;
  background: transparent;
  color: var(--text-primary);
  line-height: 1;
  padding: 5px 10px;
  height: 30px;
}

.btn:focus-visible {
  outline: 2px solid var(--accent-amber);
  outline-offset: 2px;
}

.btn--icon {
  width: 30px;
  height: 30px;
  padding: 0;
  color: var(--text-muted);
  flex-shrink: 0;
}

.btn--icon svg {
  width: 16px;
  height: 16px;
}

.btn--icon:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn--icon[aria-pressed="true"] {
  background: var(--accent-amber-dim);
  border-color: var(--border-active);
  color: var(--accent-amber);
}

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

.btn--ghost:hover {
  background: var(--bg-hover);
  border-color: var(--border-active);
  color: var(--text-primary);
}

.btn--amber {
  background: var(--accent-amber);
  border-color: var(--accent-amber);
  color: #0f0f0f;
  font-weight: 600;
}

.btn--amber:hover {
  background: #f0b840;
  box-shadow: var(--accent-amber-glow);
}

.btn--danger {
  color: var(--color-error);
  border-color: rgba(239, 91, 91, 0.3);
}

.btn--danger:hover {
  background: rgba(239, 91, 91, 0.12);
  border-color: var(--color-error);
}

.btn--sm {
  height: 28px;
  padding: 4px 10px;
}

/* Tooltip */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: #111318;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 4px 8px;
  border-radius: 4px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition);
  border: 1px solid var(--border);
  z-index: 1000;
}

[data-tooltip]:hover::after {
  opacity: 1;
}

/* ============================================================
   Canvas Area
   ============================================================ */
.canvas-area {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--bg-primary);
}

#stage-container {
  width: 100%;
  height: 100%;
  cursor: default;
}

#stage-container canvas {
  display: block;
}

/* Space+drag pan cursor */
#stage-container.panning {
  cursor: grab;
}

#stage-container.panning:active {
  cursor: grabbing;
}

/* Hint text overlay */
.hint-text {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
  pointer-events: none;
  white-space: nowrap;
  transition: opacity 0.4s ease;
}

.hint-text.hidden {
  opacity: 0;
}

/* ============================================================
   Input List Panel
   ============================================================ */
.input-list-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 360px;
  height: 100vh;
  background: var(--bg-surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 200;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: -8px 0 32px rgba(0,0,0,0.4);
}

.input-list-panel.open {
  transform: translateX(0);
}

.input-list-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.input-list-panel__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-amber);
}

.input-list-panel__body {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-hover) transparent;
}

.input-list-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 11px;
}

.input-list-table th {
  padding: 6px 12px;
  text-align: left;
  color: var(--text-faint);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg-surface);
}

.input-list-table td {
  padding: 6px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.input-list-table tr:last-child td {
  border-bottom: none;
}

.input-list-table tr:hover td {
  background: var(--bg-hover);
}

.input-list-table .ch-cell {
  color: var(--accent-teal);
  font-weight: 500;
  width: 46px;
}

.input-list-table .ch-cell--out {
  color: var(--accent-amber);
}

.input-list-section {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 10px 12px 4px !important;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border) !important;
}

.input-list-table .type-cell {
  color: var(--text-muted);
  width: 90px;
}

.input-list-notes {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  width: 100%;
  resize: none;
  outline: none;
  padding: 0;
  line-height: 1.4;
}

.input-list-notes:focus {
  color: var(--text-primary);
}

.input-list-sub td {
  background: rgba(255,255,255,0.02);
  padding-left: 20px !important;
  font-size: 10px;
  color: var(--text-muted);
}

.input-list-sub .ch-cell {
  color: var(--text-muted);
  font-size: 10px;
}

.input-list-empty {
  padding: 24px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-faint);
  text-align: center;
}

.equipment-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  padding: 10px 14px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
}

.equipment-summary__heading {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  width: 100%;
}

.equipment-summary__item {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  white-space: nowrap;
}

.equipment-summary__count {
  color: var(--accent-amber);
  font-weight: 600;
  margin-right: 3px;
}

/* ============================================================
   Element Edit Popup
   ============================================================ */
.edit-popup {
  position: fixed;
  background: var(--bg-elevated);
  border: 1px solid var(--border-active);
  border-radius: var(--radius);
  padding: 10px 12px 10px;
  z-index: 500;
  box-shadow: 0 4px 24px rgba(0,0,0,0.6);
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 140px;
}

.edit-popup__label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.edit-popup__input {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 5px 8px;
  outline: none;
  width: 100%;
  transition: border-color var(--transition);
}

.edit-popup__input:focus {
  border-color: var(--border-active);
}

.edit-popup__input--sm {
  width: 80px;
}

.edit-popup__ok {
  margin-top: 3px;
  align-self: flex-end;
}

.edit-popup__channel-row {
  display: flex;
  gap: 6px;
  align-items: center;
}

.edit-popup__channel-row .edit-popup__input--sm {
  flex: 1;
}

.edit-popup__stereo-btn {
  padding: 3px 7px;
  font-size: 10px;
  font-family: var(--font-mono);
  white-space: nowrap;
  flex-shrink: 0;
}

.edit-popup__stereo-btn[aria-pressed="true"] {
  color: var(--accent-amber);
  border-color: var(--accent-amber);
  background: rgba(232, 168, 56, 0.1);
}

/* ============================================================
   Toast Notification
   ============================================================ */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--bg-elevated);
  border: 1px solid var(--border-active);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 10px 20px;
  border-radius: var(--radius);
  z-index: 1000;
  pointer-events: none;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
  opacity: 0;
  white-space: nowrap;
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ============================================================
   Footer
   ============================================================ */
.app-footer {
  position: fixed;
  bottom: 6px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-faint);
  pointer-events: none;
  z-index: 5;
}

.app-footer a {
  color: var(--text-faint);
  text-decoration: none;
  pointer-events: all;
  transition: color var(--transition);
}

.app-footer a:hover {
  color: var(--accent-amber);
}

/* ============================================================
   Media Queries — Tablet
   ============================================================ */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 100%;
    --toolbar-height: 48px;
  }

  .app-layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    max-height: 120px;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .sidebar__palette {
    display: flex;
    flex-direction: row;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 6px 8px;
    gap: 4px;
  }

  .palette-category {
    display: none;
  }

  .palette-item {
    flex-direction: column;
    gap: 3px;
    padding: 6px 8px;
    min-width: 56px;
  }

  .palette-item__label {
    font-size: 9px;
  }

  .toolbar {
    padding: 0 8px;
    gap: 4px;
  }

  .band-name-input {
    width: 120px;
  }

  .toolbar__label {
    display: none;
  }

  .input-list-panel {
    width: 100%;
    top: auto;
    bottom: 0;
    height: 50vh;
    transform: translateY(100%);
    border-left: none;
    border-top: 1px solid var(--border);
  }

  .input-list-panel.open {
    transform: translateY(0);
  }
}