/* ─── Reset & Base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #242834;
  --border: #2e3345;
  --text: #e4e6ef;
  --text2: #9498ae;
  --accent: #6c8cff;
  --accent-hover: #8ba4ff;
  --danger: #e53935;
  --danger-hover: #ff5252;
  --radius: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,.4);
  --toolbar-h: 56px;
  --statusbar-h: 28px;
}

html, body { height: 100%; overflow: hidden; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  user-select: none;
  -webkit-user-select: none;
}

#app { display: flex; flex-direction: column; height: 100vh; }

/* ─── Toolbar ─── */
#toolbar {
  height: var(--toolbar-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  z-index: 100;
  flex-shrink: 0;
}
.toolbar-left h1 {
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.toolbar-center {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.toolbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}
.toolbar-separator {
  width: 1px;
  height: 28px;
  background: var(--border);
  margin: 0 8px;
}

.tool-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text2);
  font-size: 13px;
  cursor: pointer;
  transition: all .15s;
  white-space: nowrap;
}
.tool-btn svg {
  width: 18px; height: 18px;
  fill: currentColor;
}
.tool-btn:hover {
  background: var(--surface2);
  color: var(--text);
}
.tool-btn.active {
  background: rgba(108,140,255,.15);
  color: var(--accent);
  border-color: rgba(108,140,255,.3);
}
.tool-btn.danger:hover {
  background: rgba(229,57,53,.15);
  color: var(--danger);
}

.color-picker-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text2);
}
.color-picker-wrapper input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 28px; height: 28px;
  border: 2px solid var(--border);
  border-radius: 50%;
  background: none;
  cursor: pointer;
  padding: 0;
}
.color-picker-wrapper input[type="color"]::-webkit-color-swatch-wrapper { padding: 2px; }
.color-picker-wrapper input[type="color"]::-webkit-color-swatch { border-radius: 50%; border: none; }

.mark-count {
  font-size: 12px;
  color: var(--text2);
  background: var(--surface2);
  padding: 4px 10px;
  border-radius: 12px;
}

/* ─── Canvas ─── */
#canvas-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  cursor: grab;
}
#canvas-container.mode-point  { cursor: crosshair; }
#canvas-container.mode-curve  { cursor: crosshair; }
#canvas-container.mode-polygon { cursor: crosshair; }
#canvas-container:active { cursor: grabbing; }
#canvas-container.mode-point:active,
#canvas-container.mode-curve:active,
#canvas-container.mode-polygon:active { cursor: crosshair; }

/* ─── CSS2D Labels ─── */
.mark-label {
  background: rgba(0,0,0,.72);
  backdrop-filter: blur(8px);
  color: #fff;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 10px;
  pointer-events: auto;
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid rgba(255,255,255,.1);
  transform: translate(10px, -50%);
  transition: background .15s;
}
.mark-label:hover { background: rgba(229,57,53,.8); }
.curve-label { display: flex; gap: 4px; align-items: center; }
.curve-label .label-energy {
  color: #FFB6C1;
  font-weight: 600;
  font-size: 9px;
}

/* ─── Sidebar ─── */
#sidebar {
  position: fixed;
  top: var(--toolbar-h);
  right: 0;
  bottom: var(--statusbar-h);
  width: 280px;
  background: var(--surface);
  border-left: 1px solid var(--border);
  z-index: 90;
  display: flex;
  flex-direction: column;
  transform: translateX(280px);
  transition: transform .25s ease;
}
#sidebar.open { transform: translateX(0); }
#sidebar-toggle {
  position: absolute;
  left: -40px;
  top: 12px;
  width: 36px; height: 36px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .15s;
}
#sidebar-toggle:hover { color: var(--text); background: var(--surface2); }
#sidebar-toggle svg { width: 20px; height: 20px; fill: currentColor; }

.sidebar-content {
  padding: 16px;
  overflow-y: auto;
  flex: 1;
}
.sidebar-content h2 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: .5px;
}

/* ─── Mark Items ─── */
.mark-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius);
  margin-bottom: 4px;
  cursor: pointer;
  transition: background .15s;
}
.mark-item:hover { background: var(--surface2); }
.mark-item .mark-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.mark-item .mark-info {
  flex: 1;
  min-width: 0;
}
.mark-item .mark-name-row {
  display: flex; align-items: center; gap: 4px;
}
.mark-item .mark-name {
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mark-edit-name {
  width: 18px; height: 18px;
  border: none; background: transparent;
  color: var(--text2); cursor: pointer;
  border-radius: 3px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; opacity: 0;
  transition: all .15s;
}
.mark-edit-name svg { width: 12px; height: 12px; fill: currentColor; }
.mark-item:hover .mark-edit-name { opacity: .6; }
.mark-edit-name:hover { opacity: 1 !important; color: var(--accent); background: var(--surface2); }
.mark-name-input {
  font-size: 13px;
  background: var(--surface2);
  border: 1px solid var(--accent);
  color: var(--text);
  border-radius: 3px;
  padding: 1px 4px;
  width: 100%;
  outline: none;
}
.mark-item .mark-type {
  font-size: 11px;
  color: var(--text2);
}
.mark-item .mark-energy {
  font-size: 11px;
  color: var(--accent);
  margin-top: 1px;
}
.mark-item .mark-delete {
  width: 24px; height: 24px;
  border: none;
  background: transparent;
  color: var(--text2);
  cursor: pointer;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all .15s;
  flex-shrink: 0;
}
.mark-item:hover .mark-delete { opacity: 1; }
.mark-item .mark-delete:hover { background: rgba(229,57,53,.2); color: var(--danger); }
.mark-item .mark-delete svg { width: 16px; height: 16px; fill: currentColor; }

/* ─── Curve Toggle & Detail ─── */
.mark-toggle {
  width: 22px; height: 22px;
  border: none; background: transparent;
  color: var(--text2); cursor: pointer;
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: transform .2s, color .15s;
}
.mark-toggle svg { width: 14px; height: 14px; fill: currentColor; }
.mark-toggle:hover { color: var(--text); background: var(--surface2); }
.mark-toggle.open { transform: rotate(90deg); color: var(--accent); }

.curve-detail {
  margin: 0 0 6px 20px;
  padding: 8px 10px;
  background: var(--surface2);
  border-radius: var(--radius);
  border-left: 2px solid #f48fb1;
  animation: slideDown .2s ease;
}
.curve-detail.hidden { display: none; }

@keyframes slideDown {
  from { opacity: 0; max-height: 0; transform: translateY(-4px); }
  to { opacity: 1; max-height: 400px; transform: translateY(0); }
}

.curve-detail-loading, .curve-detail-empty {
  font-size: 11px; color: var(--text2); text-align: center; padding: 8px 0;
}

.curve-sparkline {
  margin-bottom: 6px;
}
.sparkline-svg {
  width: 100%; height: 50px; display: block;
}

.curve-records {
  max-height: 160px; overflow-y: auto;
}
.record-row {
  display: flex; align-items: center; gap: 6px;
  font-size: 11px; padding: 3px 0;
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.record-row:last-child { border-bottom: none; }
.record-val { color: var(--accent); font-weight: 500; min-width: 50px; }
.record-op { color: var(--text2); flex: 1; }
.record-time { color: var(--text2); font-size: 10px; opacity: .7; }

/* ─── Energy Popover (near curve) ─── */
#energy-popover {
  position: fixed;
  z-index: 1100;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  min-width: 200px;
  box-shadow: 0 8px 32px rgba(0,0,0,.5);
  backdrop-filter: blur(12px);
}
#energy-popover.hidden { display: none; }
.popover-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text2);
  margin-bottom: 8px;
}
.popover-row {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
}
.popover-row input[type="number"],
.popover-row input[type="text"] {
  flex: 1;
  padding: 5px 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 12px;
  outline: none;
  min-width: 0;
}
.popover-row input:focus { border-color: var(--accent); }
.popover-row select {
  padding: 5px 6px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 12px;
  width: 52px;
  flex-shrink: 0;
}
.popover-actions {
  display: flex;
  gap: 6px;
  margin-top: 8px;
}
.popover-btn {
  flex: 1;
  padding: 5px 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface2);
  color: var(--text2);
  font-size: 11px;
  cursor: pointer;
  transition: all .15s;
}
.popover-btn:hover { background: var(--border); color: var(--text); }
.popover-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.popover-btn.primary:hover { background: var(--accent-hover); }

/* ─── Status Bar ─── */
#statusbar {
  height: var(--statusbar-h);
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 24px;
  font-size: 12px;
  color: var(--text2);
  flex-shrink: 0;
  z-index: 100;
}

/* ─── Modal ─── */
#modal-overlay, #confirm-overlay, #curve-modal-overlay, #energy-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.hidden { display: none !important; }
.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  min-width: 320px;
  box-shadow: var(--shadow);
}
.modal h3 {
  font-size: 18px;
  margin-bottom: 20px;
}
.modal p {
  font-size: 14px;
  color: var(--text2);
  margin-bottom: 20px;
  line-height: 1.5;
}
.modal-field {
  margin-bottom: 16px;
}
.modal-field label {
  display: block;
  font-size: 13px;
  color: var(--text2);
  margin-bottom: 6px;
}
.modal-field input[type="text"] {
  width: 100%;
  padding: 8px 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color .15s;
}
.modal-field input[type="text"]:focus {
  border-color: var(--accent);
}
.modal-field input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 48px; height: 36px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: none;
  cursor: pointer;
  padding: 2px;
}
.modal-field input[type="color"]::-webkit-color-swatch-wrapper { padding: 2px; }
.modal-field input[type="color"]::-webkit-color-swatch { border-radius: 4px; border: none; }
.modal-field input[type="number"] {
  width: 100%;
  padding: 8px 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color .15s;
  -moz-appearance: textfield;
}
.modal-field input[type="number"]:focus { border-color: var(--accent); }
.modal-field input[type="number"]::-webkit-inner-spin-button,
.modal-field input[type="number"]::-webkit-outer-spin-button { opacity: 1; }
.modal-field select {
  padding: 8px 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 14px;
  outline: none;
  cursor: pointer;
}
.modal-field select:focus { border-color: var(--accent); }
.energy-input-group {
  display: flex;
  gap: 8px;
}
.energy-input-group input { flex: 1; }
.energy-input-group select { width: 72px; flex-shrink: 0; }
.danger-text { color: var(--danger) !important; }
.danger-text:hover { background: rgba(229,57,53,.15) !important; }
.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 24px;
}
.btn-primary, .btn-secondary {
  padding: 8px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all .15s;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary.danger { background: var(--danger); }
.btn-primary.danger:hover { background: var(--danger-hover); }
.btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { background: var(--border); }

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .toolbar-left h1 { display: none; }
  .tool-btn span { display: none; }
  .tool-btn { padding: 8px; }
  .color-picker-wrapper label { display: none; }
  #sidebar { width: 240px; transform: translateX(240px); }
  .toolbar-right .mark-count { display: none; }
}

@media (max-width: 480px) {
  .toolbar-separator { display: none; }
  #toolbar { padding: 0 8px; gap: 4px; }
}