/* === Design tokens === */
:root {
  /* Colors */
  --color-bg:               #1a1a1a;
  --color-surface:          #2d2d2d;
  --color-text-primary:     #e0e0e0;
  --color-text-secondary:   #999;
  --color-node-stroke:      steelblue;
  --color-node-fill-branch: #3a3a3a;
  --color-node-fill-leaf:   #1a1a1a;
  --color-link:             #555;
  --color-noscript-bg:      #2a1a00;
  --color-noscript-border:  #7a4a00;
  --color-legend:           #e0e0e0;
  --color-header:           #e0e0e0;
  --color-accent:           #4a9eda;
  --color-border:           #444;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.5);

  /* Border radius */
  --radius-sm:  3px;
  --radius-md:  6px;

  /* Spacing (4px base scale) */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  24px;
  --space-6:  32px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
                 'Helvetica Neue', Arial, sans-serif;
  --font-size-sm:   11px;
  --font-size-base: 14px;
  --font-size-lg:   16px;
  --font-size-xl:   40px;
}

body.light-mode {
  --color-bg:               #ffffff;
  --color-surface:          #f5f5f5;
  --color-text-primary:     #000000;
  --color-text-secondary:   #767676;
  --color-node-stroke:      steelblue;
  --color-node-fill-branch: lightsteelblue;
  --color-node-fill-leaf:   #ffffff;
  --color-link:             #ccc;
  --color-noscript-bg:      rgb(255, 228, 196);
  --color-noscript-border:  rgb(255, 204, 153);
  --color-legend:           #000000;
  --color-header:           #000000;
  --color-border:           #ddd;
  --shadow-sm:              0 1px 3px rgba(0,0,0,0.12);
  --shadow-md:              0 4px 12px rgba(0,0,0,0.15);
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
}

noscript p {
  text-align: center;
  background-color: var(--color-noscript-bg);
  color: var(--color-text-primary);
  margin: 0 auto;
  width: 80vw;
  padding: 25px 0;
  margin-top: 80px;
  border-radius: 10px;
  border: 1px solid var(--color-noscript-border);
  margin-bottom: 20px;
  display: flex-wrap;
}

#body {
  margin: 0 auto;
  position: relative;
}

svg {
  display: block;
  width: 100%;
  height: auto;
}

#header {
  font-size: var(--font-size-xl);
  font-weight: bold;
  top: 20px;
  text-align: center;
  color: var(--color-header);
}

.legend {
  position: absolute;
  top: 0px;
  right: 0;
  width: 330px;
  font-size: var(--font-size-sm);
  color: var(--color-legend);
}

.legend a {
  color: var(--color-node-stroke);
}

.node {
  cursor: pointer;
}

.node circle {
  cursor: pointer;
  fill: var(--color-node-fill-leaf);
  stroke: var(--color-node-stroke);
  stroke-width: 1.5px;
}

.node text {
  font-size: 12px;
  fill: var(--color-text-primary);
}

path.link {
  fill: none;
  stroke: var(--color-link);
  stroke-width: 1px;
}

h3 {
  color: var(--color-text-primary);
}

a {
  color: var(--color-node-stroke);
}

/* Search */
#search-container {
  text-align: center;
  padding: var(--space-2) 0 var(--space-1);
}

#search-input {
  width: 400px;
  max-width: 90vw;
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-link);
  border-radius: var(--radius-sm);
  outline: none;
}

#search-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(74, 158, 218, 0.25);
}

#search-results {
  margin: var(--space-2) auto 0;
  width: 600px;
  max-width: 90vw;
  text-align: left;
  background: var(--color-surface);
  border: 1px solid var(--color-link);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  max-height: 400px;
  overflow-y: auto;
  display: none;
}

#search-results.visible {
  display: block;
}

.search-result-item {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-link);
  font-size: 13px;
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item a {
  font-weight: bold;
  color: var(--color-node-stroke);
  text-decoration: none;
}

.search-result-item a:hover {
  text-decoration: underline;
}

.search-result-path {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-top: 2px;
}

.search-no-results {
  padding: var(--space-3);
  color: var(--color-text-secondary);
  text-align: center;
}

/* === Mobile responsive === */
@media (max-width: 768px) {
  #header {
    font-size: var(--font-size-lg);
    top: 10px;
  }

  .legend {
    position: relative;
    width: auto;
    max-width: 100%;
    padding: var(--space-2) var(--space-3);
    box-sizing: border-box;
  }
}