/* === 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;

  /* Status badge colors — saturated enough for both light and dark backgrounds */
  --badge-T: #4a9eda;
  --badge-D: #e8944a;
  --badge-R: #c8a030;
  --badge-M: #9a7eda;
  --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);
  margin: 0;
  overflow: hidden;
}

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%;
  /* Fill remaining viewport height below header + search bar */
  height: calc(100vh - 120px);
  cursor: grab;
}

svg:active {
  cursor: grabbing;
}

#header {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  font-size: var(--font-size-xl);
  font-weight: bold;
  text-align: center;
  color: var(--color-header);
  padding: var(--space-2) var(--space-4);
}

#header-actions {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

#header-actions button {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-family: var(--font-family);
  padding: var(--space-1) var(--space-2);
  cursor: pointer;
  white-space: nowrap;
}

#header-actions button:hover {
  color: var(--color-text-primary);
  border-color: var(--color-text-secondary);
}

.legend {
  display: none;
}

#notes-content {
  display: none;
}

.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);
}

/* Status badge pills (used in legend) */
.badge {
  display: inline-block;
  font-size: 10px;
  font-weight: bold;
  padding: 1px 4px;
  border-radius: 3px;
  color: #fff;
  vertical-align: middle;
}
.badge-T { background-color: var(--badge-T); }
.badge-D { background-color: var(--badge-D); }
.badge-R { background-color: var(--badge-R); }
.badge-M { background-color: var(--badge-M); }
/* 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;
  cursor: pointer;
}

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

.search-result-item:hover {
  background: var(--color-bg);
}

.search-result-header {
  display: flex;
  align-items: center;
  gap: 6px;
}

.search-result-name {
  font-weight: bold;
  color: var(--color-node-stroke);
}

.search-result-ext {
  font-size: 11px;
  color: var(--color-text-secondary);
  text-decoration: none;
  flex-shrink: 0;
  line-height: 1;
}

.search-result-ext:hover {
  color: var(--color-node-stroke);
  text-decoration: none;
}

.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 floating notes button (hidden on desktop; header button used instead) */
#mobile-notes-btn {
  display: none;
}

/* Notes overlay */
#notes-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 299;
}

#notes-overlay.visible {
  display: block;
}

/* Notes panel (desktop: side panel) */
#notes-panel {
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  right: 0;
  width: 400px;
  max-width: 100vw;
  height: 100vh;
  background: var(--color-surface);
  z-index: 300;
  transform: translateX(100%);
  transition: transform 250ms ease;
  will-change: transform;
  box-shadow: var(--shadow-md);
}

#notes-panel.open {
  transform: translateX(0);
}

#notes-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

#notes-panel-title {
  font-size: var(--font-size-lg);
  font-weight: bold;
  color: var(--color-text-primary);
}

#notes-panel-close {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  padding: 2px var(--space-1);
  border-radius: var(--radius-sm);
}

#notes-panel-close:hover {
  color: var(--color-text-primary);
  background: var(--color-bg);
}

#notes-panel-body {
  flex: 1;
  padding: var(--space-4);
  overflow-y: auto;
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  line-height: 1.6;
}

#notes-panel-body a {
  color: var(--color-node-stroke);
}

#notes-panel-body h3 {
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
}

#notes-panel-body h3:first-child {
  margin-top: 0;
}

/* === Mobile responsive === */
@media (max-width: 768px) {
  #header {
    font-size: var(--font-size-lg);
    top: 0;
    position: relative;
    padding: var(--space-2) var(--space-3);
  }

  #header-actions {
    right: var(--space-3);
  }

  /* Hide desktop notes button on mobile (floating button used instead) */
  #header-notes-btn {
    display: none;
  }

  #search-container {
    padding: var(--space-1) 0;
  }

  #search-input {
    padding: var(--space-1) var(--space-2);
    font-size: 13px;
  }

  /* Maximize SVG tree viewport */
  svg {
    height: calc(100vh - 80px);
  }

  /* Floating notes button (mobile only) */
  #mobile-notes-btn {
    display: block;
    position: fixed;
    bottom: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: var(--space-2) var(--space-5);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    font-weight: bold;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    z-index: 100;
  }

  #mobile-notes-btn:hover {
    background: var(--color-bg);
  }

  /* Full-width notes panel on mobile */
  #notes-panel {
    width: 100vw;
    box-shadow: none;
  }
}