:root {
  --bg: #07080c;
  --surface: #0c0e15;
  --surface-2: #10131c;
  --border: rgba(255, 255, 255, 0.06);
  --border-hi: rgba(255, 255, 255, 0.13);
  --text: #c4c8db;
  --text-mid: #8892a4;
  --text-dim: #4a5268;

  --green: #39ff8a;
  --green-dim: rgba(57, 255, 138, 0.08);
  --green-glow: rgba(57, 255, 138, 0.25);
  --purple: #8866ff;
  --purple-dim: rgba(136, 102, 255, 0.08);
  --amber: #ffc940;
  --amber-dim: rgba(255, 201, 64, 0.08);
  --red: #ff5566;

  --font: "IBM Plex Mono", monospace;
  --r: 3px;

  --fs-xs:   11px;
  --fs-sm:   12px;
  --fs-md:   13px;
  --fs-base: 15px;
  --fs-lg:   18px;

  --header-h: 58px;
  --nav-h: 40px;
  --footer-h: 36px;

  --surface-hover:     rgba(255, 255, 255, 0.04);
  --surface-hover-dim: rgba(255, 255, 255, 0.015);
  --focus-ring:        rgba(57, 255, 138, 0.40);
  --green-border:      rgba(57, 255, 138, 0.30);
  --amber-border:      rgba(255, 201, 64, 0.40);
  --label-bg:          rgba(7, 8, 12, 0.72);
  --dot-border:        rgba(255, 255, 255, 0.12);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg:        #f0f2f8;
    --surface:   #ffffff;
    --surface-2: #e8eaf2;
    --border:    rgba(0, 0, 0, 0.08);
    --border-hi: rgba(0, 0, 0, 0.15);
    --text:      #111827;
    --text-mid:  #4b5570;
    --text-dim:  #7880a0;

    --green:      #0d8040;
    --green-dim:  rgba(13, 128, 64, 0.10);
    --green-glow: rgba(13, 128, 64, 0.30);
    --purple:     #5533cc;
    --purple-dim: rgba(85, 51, 204, 0.10);
    --amber:      #a07000;
    --amber-dim:  rgba(160, 112, 0, 0.10);
    --red:        #cc2233;

    --surface-hover:     rgba(0, 0, 0, 0.04);
    --surface-hover-dim: rgba(0, 0, 0, 0.02);
    --focus-ring:        rgba(13, 128, 64, 0.45);
    --green-border:      rgba(13, 128, 64, 0.35);
    --amber-border:      rgba(160, 112, 0, 0.40);
    --label-bg:          rgba(250, 251, 255, 0.88);
    --dot-border:        rgba(0, 0, 0, 0.12);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: var(--fs-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Header */

header {
  height: var(--header-h);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 20px;
  background: var(--bg);
}

.wordmark {
  font-size: var(--fs-lg);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1;
  flex-shrink: 0;
}

.w-lib {
  color: var(--text);
}
.w-dot {
  color: var(--text-dim);
  margin: 0 1px;
}
.w-mod {
  color: var(--green);
}

.header-desc {
  color: var(--text-mid);
  /* font-size: 11px; */
  font-weight: 300;
  flex: 1;
}

.header-desc a {
  color: var(--text-mid);
  text-decoration: none;
}

.breadcrumb-sep {
  color: var(--text-dim);
  margin: 0 4px;
}

.breadcrumb-current {
  color: var(--text);
  font-weight: 500;
}

.header-link {
  /* font-size: 11px; */
  color: var(--text-mid);
  text-decoration: none;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: var(--r);
  transition:
    color 0.12s,
    border-color 0.12s;
  white-space: nowrap;
}

.header-link:hover {
  color: var(--text);
  border-color: var(--border-hi);
}

/* Demos dropdown */

.nav-dropdown {
  position: relative;
}

.nav-dropdown > summary {
  list-style: none;
  cursor: pointer;
  color: var(--text-mid);
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: var(--r);
  transition: color 0.12s, border-color 0.12s;
  white-space: nowrap;
  font-family: var(--font);
  font-size: inherit;
  user-select: none;
}

.nav-dropdown > summary::-webkit-details-marker { display: none; }
.nav-dropdown > summary::marker { content: ''; }

.nav-dropdown > summary::after {
  content: ' ▾';
  font-size: 0.75em;
  display: inline-block;
  transition: transform 0.15s;
  transform-origin: center 55%;
}

.nav-dropdown[open] > summary::after {
  transform: rotate(180deg);
}

.nav-dropdown > summary:hover,
.nav-dropdown[open] > summary {
  color: var(--text);
  border-color: var(--border-hi);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border-hi);
  border-radius: var(--r);
  min-width: 200px;
  z-index: 100;
  overflow: hidden;
  animation: dropIn 0.1s ease;
}

@keyframes dropIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.dropdown-item {
  display: block;
  padding: 8px 14px;
  color: var(--text-mid);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s, color 0.1s;
  white-space: nowrap;
}

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

.dropdown-item:hover {
  background: var(--surface-hover);
  color: var(--text);
}

/* Tab Navigation */

.tab-nav {
  height: var(--nav-h);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: stretch;
  padding: 0 20px;
  background: var(--bg);
  gap: 2px;
}

.tab-btn {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  color: var(--text-mid);
  font-family: var(--font);
  /* font-size: 11px; */
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0 14px;
  cursor: pointer;
  transition: color 0.1s;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text);
}

.tab-btn.active {
  color: var(--green);
  border-bottom-color: var(--green);
}

/* Main Layout */

.main {
  display: grid;
  grid-template-columns: 35vw 1fr;
  height: calc(100vh - var(--header-h) - var(--nav-h) - var(--footer-h));
}

/* Left Column */

.col-left {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  overflow: hidden;
}

.tab-desc {
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  color: var(--text-mid);
  /* font-size: 11px; */
  font-style: italic;
  font-weight: 300;
  flex-shrink: 0;
}

/* Examples List */

.examples {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  min-height: 0;
}

.example-item {
  border-bottom: 1px solid var(--border);
}

.example-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 20px;
  cursor: pointer;
  user-select: none;
  transition: background 0.1s;
}

.example-header:hover {
  background: var(--surface-hover-dim);
}

.example-item.active .example-header {
  background: var(--green-dim);
}

.example-num {
  /* font-size: 10px; */
  color: var(--text-dim);
  width: 16px;
  flex-shrink: 0;
}

.example-item.active .example-num {
  color: var(--green);
}

.example-meta {
  flex: 1;
  min-width: 0;
}

.example-title {
  /* font-size: 13px; */
  font-weight: 500;
  color: var(--text);
  line-height: 1.3;
}

.example-item.active .example-title {
  color: var(--green);
}

.example-preview {
  /* font-size: 10px; */
  color: var(--text-dim);
  margin-top: 1px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.example-item.active .example-preview {
  color: var(--text-mid);
}

.example-chevron {
  /* font-size: 9px; */
  color: var(--text-dim);
  flex-shrink: 0;
  transition: transform 0.15s;
}

.example-item.active .example-chevron {
  transform: rotate(90deg);
  color: var(--green);
}

.example-body {
  display: none;
  padding: 0 20px 14px;
  animation: fadeIn 0.12s ease;
}

.example-item.active .example-body {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.example-result {
  /* font-size: 11px; */
  color: var(--amber);
  background: var(--amber-dim);
  border-left: 2px solid var(--amber-border);
  padding: 5px 10px;
  margin-bottom: 12px;
  border-radius: 0 var(--r) var(--r) 0;
  word-break: break-all;
  font-weight: 500;
  line-height: 1.5;
}

.inputs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 8px 12px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.input-label {
  /* font-size: 10px; */
  color: var(--text-mid);
  font-weight: 500;
  letter-spacing: 0.04em;
}

.input-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Range slider */
.input-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 2px;
  background: var(--border-hi);
  border-radius: 1px;
  outline: none;
  cursor: pointer;
}

.input-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green);
  cursor: pointer;
  box-shadow: 0 0 8px var(--green-glow);
  transition: box-shadow 0.1s;
}

.input-slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 12px var(--green-glow);
}

.input-slider::-moz-range-thumb {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: var(--green);
  cursor: pointer;
}

/* Number input */
.input-number {
  width: 54px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--r);
  color: var(--text);
  font-family: var(--font);
  /* font-size: 11px; */
  padding: 2px 5px;
  text-align: right;
  outline: none;
  transition: border-color 0.1s;
  flex-shrink: 0;
}

.input-number:focus {
  border-color: var(--focus-ring);
}

/* Try It */

.tryit {
  border-top: 1px solid var(--border);
  padding: 12px 20px;
  background: var(--surface);
  flex-shrink: 0;
}

.tryit-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 7px;
}

.tryit-label {
  /* font-size: 9px; */
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-mid);
}

.tryit-hint {
  /* font-size: 10px; */
  color: var(--text-dim);
  font-style: italic;
}

.tryit-input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r);
  color: var(--text);
  font-family: var(--font);
  /* font-size: 12px; */
  line-height: 1.6;
  padding: 7px 10px;
  resize: none;
  outline: none;
  transition: border-color 0.1s;
}

.tryit-input:focus {
  border-color: var(--border-hi);
}

.tryit-output {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin-top: 6px;
  min-height: 18px;
}

.output-prompt {
  color: var(--green);
  /* font-size: 14px; */
  line-height: 1.3;
  flex-shrink: 0;
}

.output-value {
  /* font-size: 12px; */
  color: var(--amber);
  word-break: break-word;
  line-height: 1.5;
}

.output-value.err {
  color: var(--red);
}

/* Right Column / Canvas */

.col-right {
  background: var(--surface);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.canvas-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  min-height: 0;
}

#canvas {
  display: block;
  border-radius: var(--r);
  border: 1px solid var(--border);
}

.canvas-legend {
  padding: 8px 14px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  flex-shrink: 0;
  min-height: 33px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  /* font-size: 10px; */
  color: var(--text-mid);
}

.legend-swatch {
  width: 20px;
  height: 2px;
  border-radius: 1px;
  flex-shrink: 0;
}

/* Intro */

.intro {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.intro-text {
  /* font-size: 11px; */
  color: var(--text-mid);
  margin-bottom: 8px;
  line-height: 1.7;
  font-weight: 300;
}

.intro-install {
  margin-bottom: 8px;
}

.install-cmd {
  display: inline-block;
  font-family: var(--font);
  /* font-size: 11px; */
  color: var(--green);
  background: var(--green-dim);
  border-left: 2px solid var(--green-border);
  padding: 4px 12px;
  border-radius: 0 var(--r) var(--r) 0;
  letter-spacing: 0.01em;
}

.intro-links {
  display: flex;
  gap: 12px;
}

.intro-link {
  /* font-size: 10px; */
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.12s;
}

.intro-link:hover {
  color: var(--text-mid);
}

/* Footer */

footer {
  height: var(--footer-h);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 20px;
  background: var(--bg);
  /* font-size: 10px; */
  color: var(--text-dim);
  flex-shrink: 0;
}

.footer-sep {
  color: var(--text-dim);
  opacity: 0.4;
}

.footer-link {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.12s;
}

.footer-link:hover {
  color: var(--text-mid);
}

.footer-right {
  margin-left: auto;
}

/* Demo pages */

.demo-main {
  display: grid;
  grid-template-columns: 35vw 1fr;
  height: calc(100vh - var(--header-h) - var(--footer-h));
}

.demo-controls {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
  padding: 14px 18px;
  gap: 14px;
}

.ctrl-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ctrl-section h3 {
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--text-mid);
  padding-bottom: 5px;
  border-bottom: 1px solid var(--border);
}

.ctrl-row {
  display: flex;
  align-items: center;
  gap: 7px;
}

.ctrl-label {
  color: var(--text-mid);
  flex-shrink: 0;
}

.ctrl-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 2px;
  background: var(--border-hi);
  border-radius: 1px;
  outline: none;
  cursor: pointer;
}

.ctrl-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green);
  cursor: pointer;
  box-shadow: 0 0 8px var(--green-glow);
  transition: box-shadow 0.1s;
}

.ctrl-slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 12px var(--green-glow);
}

.ctrl-slider::-moz-range-thumb {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: var(--green);
  cursor: pointer;
}

.ctrl-num {
  width: 54px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--r);
  color: var(--text);
  font-family: var(--font);
  padding: 2px 5px;
  text-align: right;
  outline: none;
  flex-shrink: 0;
  transition: border-color 0.1s;
}

.ctrl-num:focus {
  border-color: var(--focus-ring);
}

.ctrl-section--fill {
  flex: 1;
  min-height: 0;
}

.info-text {
  font-size: var(--fs-sm);
  color: var(--text-dim);
  line-height: 1.7;
  font-weight: 300;
}

.info-text + .info-text {
  margin-top: 8px;
}

.txt-green { color: var(--green); }
.txt-amber { color: var(--amber); }
.txt-mid   { color: var(--text-mid); }

/* Scrollbar */

::-webkit-scrollbar {
  width: 4px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-hi);
  border-radius: 2px;
}