* { box-sizing: border-box; }

:root {
  --bg: #f7fdf7;
  --panel: #ffffff;
  --border: #c8e6c8;
  --accent: #2e7d32;
  --accent-hover: #1b5e20;
  --text: #1a1a1a;
  --muted: #666;
  --danger: #c62828;
  --warning: #f9a825;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

.app { display: flex; flex-direction: column; height: 100%; }

/* Top bar */
.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 2px solid var(--border);
  z-index: 10;
}
.title { font-size: 1.25rem; font-weight: 700; color: var(--accent); }
.controls { display: flex; gap: 8px; }
.btn-toggle {
  background: #e8f5e9;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 14px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
}
.btn-toggle:hover { background: var(--accent); color: #fff; }
.btn-toggle.active { background: var(--accent); color: #fff; border-color: var(--accent-hover); }
.btn-action {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 14px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
}
.btn-action:hover { background: #f0f0f0; }
.btn-small {
  background: #e8f5e9;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
}
.btn-small:hover { background: var(--accent); color: #fff; }

/* Simulation area */
.sim-area {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  padding: 12px;
  gap: 12px;
}
.left-panel { width: 420px; display: flex; flex-direction: column; gap: 10px; min-height: 0; overflow: hidden; }
.left-panel #humanCanvas { flex: 1; min-height: 0; width: 100%; object-fit: contain; }
.right-panel { flex: 1; display: flex; flex-direction: column; gap: 12px; min-height: 0; overflow: hidden; }

canvas { background: #fff; border: 1px solid var(--border); border-radius: 6px; display: block; max-width: 100%; }

.human-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--panel);
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.readout { font-size: 0.95rem; display: flex; justify-content: space-between; }
.readout span { font-weight: 700; color: var(--accent); }

/* Panels */
.panel-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 0;
  overflow: hidden;
}
.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  background: #f0f7f0;
  flex-shrink: 0;
}
.panel-title { font-weight: 700; color: var(--accent); font-size: 1rem; }
.strip-row { display: flex; gap: 12px; flex: 1; min-height: 0; overflow: hidden; }
.food-panel, .exercise-panel { flex: 1; min-width: 280px; min-height: 0; overflow: hidden; }
.plate-area, .diary-area {
  position: relative;
  height: 165px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #fbfcfb;
}
.drop-zone {
  position: relative;
  width: 260px;
  height: 130px;
  border: 2px dashed var(--border);
  border-radius: 8px;
  background: #fff;
  overflow: hidden;
}
.drop-zone canvas {
  width: 100%;
  height: 100%;
  border: none;
  cursor: pointer;
}
.drop-hint {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  color: var(--muted);
  font-size: 0.9rem;
  pointer-events: none;
  text-align: center;
  z-index: 2;
}
.plate-summary, .diary-summary {
  padding: 4px 12px;
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  width: 100%;
  text-align: center;
  flex-shrink: 0;
}
.drag-strip {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px 12px;
  flex: 1;
  min-height: 100px;
  overflow-y: auto;
  user-select: none;
}
.item-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: grab;
  font-size: 0.85rem;
  flex-shrink: 0;
}
.item-card:active { cursor: grabbing; border-color: var(--accent); }
.item-card img { width: 32px; height: 32px; object-fit: contain; flex-shrink: 0; }
.item-label { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item-cal { font-size: 0.75rem; color: var(--muted); flex-shrink: 0; }

.charts-row { display: flex; gap: 12px; flex-shrink: 0; }
.chart-panel { flex: 1; min-height: 200px; }

/* Control panel */
.control-panel {
  background: var(--panel);
  border-top: 2px solid var(--border);
  padding: 12px 16px;
  overflow-y: auto;
  flex-shrink: 0;
}
.slider-row { display: flex; gap: 16px; flex-wrap: wrap; align-items: end; }
.slider-group { display: flex; flex-direction: column; gap: 6px; min-width: 130px; }
.slider-group label { font-size: 0.85rem; font-weight: 600; color: var(--muted); }
.slider-group input[type=range] { width: 100%; accent-color: var(--accent); }
.slider-group select { width: 100%; padding: 4px; font-size: 0.9rem; }
.slider-group span { font-size: 0.9rem; font-weight: 700; color: var(--accent); }
.clock-group { flex: 1; }
.clock-controls { display: flex; gap: 6px; }
.clock-controls button {
  flex: 1;
  padding: 6px 10px;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 4px;
  cursor: pointer;
}
.clock-controls button:disabled { opacity: 0.5; cursor: not-allowed; }
.clock-time { margin-top: 6px; font-size: 0.9rem; font-weight: 700; color: var(--accent); }

/* Overlay messages */
.overlay {
  position: fixed;
  top: 60px; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 100;
  pointer-events: none;
}
.msg {
  padding: 8px 16px;
  border-radius: 4px;
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  pointer-events: auto;
  opacity: 0;
  transition: opacity 0.3s;
}
.msg.show { opacity: 1; }
.msg.warn { background: var(--warning); color: #000; }
.msg.danger { background: var(--danger); }

/* Modals */
.modal {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(2px);
}
.modal.hidden { display: none; }
.modal-content {
  background: var(--panel);
  border-radius: 8px;
  width: 520px;
  max-width: 90%;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: #f0f7f0;
}
.modal-header .modal-title { font-weight: 700; color: var(--accent); font-size: 1.1rem; }
.close { font-size: 1.5rem; cursor: pointer; color: var(--muted); }
.close:hover { color: var(--text); }
.modal-body { padding: 18px; font-size: 0.95rem; line-height: 1.5; overflow-y: auto; max-height: 40vh; }
.modal-footer { padding: 14px 18px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; }
.modal-footer button { padding: 8px 20px; background: var(--accent); color: #fff; border: none; border-radius: 4px; cursor: pointer; }
.modal-footer button:hover { background: var(--accent-hover); }

/* Responsive tweaks */
@media (max-width: 900px) {
  .strip-row { flex-direction: column; }
  .charts-row { flex-direction: column; }
  .sim-area { flex-direction: column; }
  .left-panel { width: 100%; }
}