:root {
  --bg-color: #111;
  --header-bg: #222;
  --text-color: #ddd;
  --text-dim: #888;
  --accent-color: #444;
  --panel-width: 380px;
  --header-height: 60px;
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-main);
  overflow: hidden; /* Prevent page scroll, SVG handles zoom */
  height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background-color: var(--header-bg);
  height: var(--header-height);
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--accent-color);
  z-index: 100;
}

h1 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
  white-space: nowrap;
}

.controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.search-container {
  display: flex;
  align-items: center;
}

input#search {
  background: #000;
  border: 1px solid var(--accent-color);
  color: #fff;
  padding: 0.5rem;
  border-radius: 4px;
  font-family: var(--font-main);
  font-size: 14px;
  width: 200px;
}

input#search:focus {
  outline: none;
  border-color: #666;
}

button#reset {
  background: #333;
  border: 1px solid var(--accent-color);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
}

button#reset:hover {
  background: #444;
}

main {
  flex: 1;
  position: relative;
  overflow: hidden;
}

svg#plot {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none; /* Let D3 handle pinch/pan */
}

/* Plot styling */
.food-circle {
  cursor: pointer;
  opacity: 0.95;
  stroke: rgba(0, 0, 0, 0.5);
  stroke-width: 0.5px;
  vector-effect: non-scaling-stroke;
  transition: opacity 0.1s;
}

.food-circle.dimmed {
  opacity: 0.2 !important;
}

.food-circle.selected {
  opacity: 1 !important;
}

.food-label {
  font-size: 12px;
  fill: #fff;
  pointer-events: all;
  cursor: pointer;
  text-shadow: 0 1px 2px #000;
  text-anchor: middle;
}

/* Zoom dependent visibility */
.labels-on .food-circle {
  display: none;
}
.labels-off .food-label {
  display: none;
}

/* Tooltip */
#tooltip {
  position: absolute;
  background: rgba(0, 0, 0, 0.9);
  color: #fff;
  padding: 8px 12px;
  border-radius: 4px;
  pointer-events: none;
  font-size: 14px;
  z-index: 1000;
  border: 1px solid #444;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
  max-width: 300px;
}

#tooltip.hidden {
  display: none;
}

/* Detail Panel */
#detail-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: var(--panel-width);
  height: 100%;
  background: rgba(20, 20, 20, 0.95);
  backdrop-filter: blur(8px);
  border-left: 1px solid var(--accent-color);
  z-index: 200;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease-out;
}

#detail-panel.hidden {
  transform: translateX(100%);
}

#detail-close {
  position: absolute;
  top: 10px;
  right: 10px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 2rem;
  cursor: pointer;
  line-height: 1;
  padding: 0 5px;
  z-index: 210;
}

#detail-close:hover {
  color: #fff;
}

#detail-body {
  padding: 2rem 1.5rem;
  overflow-y: auto;
  flex: 1;
}

.detail-header {
  margin-bottom: 1.5rem;
  padding-right: 2rem;
}

.detail-name {
  font-size: 1.4rem;
  font-weight: bold;
  margin-bottom: 0.2rem;
  line-height: 1.2;
}

.detail-category {
  font-size: 0.9rem;
  color: var(--text-dim);
}

.detail-divider {
  height: 1px;
  background: var(--accent-color);
  margin: 1.5rem 0;
}

.section-title {
  font-size: 0.8rem;
  font-weight: bold;
  letter-spacing: 0.1rem;
  color: var(--text-dim);
  margin: 1.5rem 0 0.8rem 0;
  text-transform: uppercase;
}

.nutrient-row {
  display: flex;
  align-items: center;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
}

.nutrient-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding-right: 0.5rem;
}

.nutrient-value {
  width: 80px;
  text-align: right;
  font-family: var(--font-mono);
  color: var(--text-color);
}

.dri-container {
  width: 120px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 1rem;
}

.dri-bar-bg {
  flex: 1;
  height: 8px;
  background: #333;
  border-radius: 4px;
  overflow: hidden;
}

.dri-bar-fill {
  height: 100%;
  border-radius: 4px;
}

.dri-pct {
  width: 35px;
  font-size: 0.75rem;
  text-align: right;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* Mobile Responsiveness */
@media (max-width: 640px) {
  header {
    flex-direction: column;
    height: auto;
    padding: 0.8rem;
    gap: 0.8rem;
    align-items: flex-start;
  }
  
  .controls {
    width: 100%;
    justify-content: space-between;
  }
  
  .search-container {
    flex: 1;
  }
  
  input#search {
    width: 100%;
    font-size: 16px; /* Prevents iOS auto-zoom */
  }
  
  #detail-panel {
    width: 100%;
    max-height: 42vh;
    top: auto;
    bottom: 0;
    border-left: none;
    border-top: 1px solid var(--accent-color);
    border-radius: 12px 12px 0 0;
  }
  
  #detail-panel.hidden {
    transform: translateY(100%);
  }
  
  .dri-container {
    width: 130px;
  }
}

@media (pointer: coarse) {
  button, #detail-close, input {
    min-height: 44px;
    min-width: 44px;
  }
}