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

:root {
  --bg:        #f5f4f1;
  --surface:   #ffffff;
  --border:    #e0ddd6;
  --text:      #333;
  --text-dim:  #888;
  --accent:    #3a5ac0;
  --accent-bg: #eef1ff;
  --west-w:    220px;
  --east-w:    260px;
}

html, body { height: 100%; overflow: hidden; }

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: auto 1fr auto;
  font-family: 'Segoe UI', system-ui, sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
}

/* ── Header ─────────────────────────────────────── */
[data-role="header"] {
  grid-row: 1; grid-column: 1 / -1;
  padding: 0 1rem;
  height: 2.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: .6rem;
  font-size: .85rem;
  font-weight: 700;
  color: #3a3836;
  box-shadow: 0 1px 4px rgba(0,0,0,.05);
  z-index: 10;
}
[data-role="header-title"] { font-weight: 700; font-size: .85rem; color: #3a3836; white-space: nowrap; }
[data-role="header"] > span { font-weight: 400; color: var(--text-dim); font-size: .75rem; white-space: nowrap; }
[data-role="home-link"] { margin-left: auto; font-weight: 400; font-size: .8rem; color: var(--accent); text-decoration: none; white-space: nowrap; }
[data-role="home-link"]:hover { text-decoration: underline; }
/* The subtitle is the first thing to go when the header runs out of room. */
@media (max-width: 1439px) { [data-role="header"] > span:not([data-role]) { display: none; } }

/* ── Search bar ──────────────────────────────────── */
[data-role="search-bar"] {
  display: flex;
  align-items: center;
  gap: .3rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0 .5rem;
  height: 1.75rem;
  flex-shrink: 0;
  transition: border-color .15s, box-shadow .15s;
}
[data-role="search-bar"]:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px #3a5ac018;
}
[data-role="search-icon"] {
  width: 13px; height: 13px;
  color: #bbb;
  flex-shrink: 0;
}
[data-role="search-input"] {
  border: none;
  background: transparent;
  font-size: .72rem;
  color: var(--text);
  outline: none;
  width: 190px;
  min-width: 0;
}
[data-role="search-input"]::placeholder { color: #c0bcb4; }
[data-role="search-input"]::-webkit-search-cancel-button { cursor: pointer; }
[data-role="search-count"] {
  font-size: .6rem;
  color: var(--text-dim);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── Category filter ─────────────────────────────── */
[data-role="cat-filter"] {
  display: flex;
  align-items: center;
  gap: .2rem;
  flex-shrink: 0;
}
[data-role="cat-filter"] button {
  padding: .15rem .48rem;
  font-size: .62rem;
  font-weight: 600;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: none;
  color: var(--text-dim);
  cursor: pointer;
  letter-spacing: .02em;
  transition: all .12s;
  white-space: nowrap;
}
[data-role="cat-filter"] button:hover {
  border-color: #c0bcb4;
  color: var(--text);
}
[data-role="cat-filter"] [data-cat="all"][data-active]    { background: var(--accent);   border-color: var(--accent);   color: #fff; }
[data-role="cat-filter"] [data-cat="easy"][data-active]   { background: #1a8a50;         border-color: #1a8a50;         color: #fff; }
[data-role="cat-filter"] [data-cat="medium"][data-active] { background: #d06000;         border-color: #d06000;         color: #fff; }
[data-role="cat-filter"] [data-cat="hard"][data-active]   { background: #c83060;         border-color: #c83060;         color: #fff; }
[data-role="cat-filter"] [data-cat="cs101"][data-active]  { background: #7c3aed;         border-color: #7c3aed;         color: #fff; }
[data-role="cat-filter"] [data-cat="cs201"][data-active]  { background: #0e7490;         border-color: #0e7490;         color: #fff; }
[data-role="cat-filter"] [data-cat="cs301"][data-active]  { background: #1d4ed8;         border-color: #1d4ed8;         color: #fff; }
[data-role="cat-filter"] [data-cat="cs401"][data-active]  { background: #9f1239;         border-color: #9f1239;         color: #fff; }
[data-role="cat-filter"] [data-cat="gis"][data-active]    { background: #065f46;         border-color: #065f46;         color: #fff; }
[data-role="cat-filter"] [data-cat="civics"][data-active] { background: #92400e;         border-color: #92400e;         color: #fff; }
[data-role="cat-filter"] [data-cat="security"][data-active] { background: #334155;       border-color: #334155;         color: #fff; }

/* ── Sidebar group label ─────────────────────────── */
.sidebar-group-label {
  padding: .5rem .85rem .25rem;
  font-size: .55rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: #7c3aed;
  background: #f5f0ff;
  border-top: 2px solid #d8ccf8;
  border-bottom: 1px solid #ece9e3;
  user-select: none;
}
.sidebar-group-label.cs201-label {
  color: #0e7490;
  background: #ecfeff;
  border-top-color: #a5f3fc;
}
.sidebar-group-label.cs301-label {
  color: #1d4ed8;
  background: #eff6ff;
  border-top-color: #bfdbfe;
}
.sidebar-group-label.cs401-label {
  color: #9f1239;
  background: #fff1f2;
  border-top-color: #fecdd3;
}
.sidebar-group-label.gis-label {
  color: #065f46;
  background: #ecfdf5;
  border-top-color: #6ee7b7;
}
.sidebar-group-label.security-label {
  color: #334155;
  background: #f1f5f9;
  border-top-color: #cbd5e1;
}

/* ── West Sidebar ───────────────────────────────── */
[data-role="west"] {
  grid-row: 2; grid-column: 1;
  width: var(--west-w);
  overflow-y: auto;
  background: #faf9f7;
  border-right: 1px solid var(--border);
}

[data-role="west"] details { border-bottom: 1px solid #ece9e3; }

[data-role="west"] summary {
  padding: .5rem .85rem;
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--text-dim);
  cursor: pointer;
  list-style: none;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
[data-role="west"] summary::after { content: '▸'; font-size: .55rem; transition: transform .15s; }
[data-role="west"] details[open] > summary::after { transform: rotate(90deg); }
[data-role="west"] summary:hover { background: #f0efe9; color: #555; }

[data-role="viz-list"] { list-style: none; padding: .15rem 0; }
[data-role="viz-list"] li { padding: 0; }
[data-role="viz-list"] button {
  width: 100%;
  padding: .38rem .85rem .38rem 1rem;
  font-size: .74rem;
  color: #555;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: .45rem;
  transition: background .12s;
}
[data-role="viz-list"] button:hover { background: var(--accent-bg); color: var(--accent); }
[data-role="viz-list"] button[data-active] {
  background: #e4e9f8;
  color: var(--accent);
  font-weight: 600;
}
[data-role="badge"] {
  font-size: .62rem;
  font-weight: 600;
  color: #aaa;
  min-width: 2.4rem;
  text-align: right;
  flex-shrink: 0;
}
[data-role="viz-list"] button[data-active] [data-role="badge"] { color: var(--accent); }

/* ── Center ─────────────────────────────────────── */
[data-role="center"] {
  grid-row: 2; grid-column: 2;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}

[data-role="canvas-area"] {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--bg);
  min-height: 0;
}

canvas#c {
  position: absolute;
  inset: 0;
  display: block;
}

/* ── Playback Bar ────────────────────────────────── */
[data-role="playback"] {
  flex: 0 0 auto;
  padding: .35rem .85rem .25rem;
  background: var(--surface);
  border-top: 1px solid var(--border);
  box-shadow: 0 -1px 5px rgba(0,0,0,.04);
  display: flex;
  flex-direction: column;
  gap: .2rem;
}

[data-role="narration"] {
  font-size: .7rem;
  color: #555;
  min-height: 1rem;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 0 1rem;
}

[data-role="controls-row"] {
  display: flex;
  align-items: center;
  gap: .3rem;
  /* Wrap rather than overflow: a viz with many example tabs (the spherical
     clipping walkthrough has nine) would otherwise push them off the edge. */
  flex-wrap: wrap;
  row-gap: .35rem;
  justify-content: center;
}

[data-role="playback"] button {
  font-size: .7rem;
  padding: .32rem .6rem;
  border: 1px solid #d0cdc6;
  border-radius: 4px;
  background: var(--surface);
  color: #555;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: .2rem;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all .12s;
}
[data-role="playback"] button:hover { background: var(--accent-bg); color: var(--accent); border-color: #a0b0e0; }
[data-role="playback"] button:active { transform: scale(.97); }
[data-role="playback"] button:disabled { opacity: .25; cursor: default; pointer-events: none; }
[data-role="playback"] button svg { width: 12px; height: 12px; fill: currentColor; }
[data-role="playback"] button[data-action="play"] { background: var(--accent); color: #fff; border-color: var(--accent); }
[data-role="playback"] button[data-action="play"]:hover { background: #2d48a8; }
[data-role="playback"] button[data-role="ex"] { font-weight: 600; }
[data-role="playback"] button[data-role="ex"][data-active] { background: var(--accent); color: #fff; border-color: var(--accent); }

[data-role="sep"] { width: 1px; height: 1.1rem; background: var(--border); flex-shrink: 0; }

/* The example tabs must wrap internally, not just as one block: a viz with
   nine chapters otherwise overflows the row at narrower viewports. */
[data-role="examples"] {
  display: flex;
  align-items: center;
  gap: .3rem;
  flex-wrap: wrap;
  row-gap: .3rem;
  justify-content: center;
  min-width: 0;
}

.speed-group {
  display: flex;
  gap: 2px;
  align-items: center;
  margin-left: auto;
}
.speed-btn {
  min-width: 42px;
  width: auto;
  flex-shrink: 0;
  height: 22px;
  border: 1px solid #d0ccc6;
  border-radius: 3px;
  background: #f5f4f1;
  color: #888;
  font: 600 .6rem/1 'Segoe UI', system-ui, sans-serif;
  cursor: pointer;
  padding: 0 8px;
}
.speed-btn:hover { background: #eae8e4; }
.speed-btn.active {
  background: var(--accent, #3a5ac0);
  border-color: var(--accent, #3a5ac0);
  color: #fff;
}

[data-role="playback"] small {
  font-size: .5rem;
  color: #c8c4bc;
  text-align: center;
}
[data-role="playback"] small kbd {
  padding: .02rem .16rem;
  border: 1px solid #ddd;
  border-radius: 2px;
  background: var(--bg);
}

/* ── Menu Bar ───────────────────────────────────── */
[data-role="menu-bar"] {
  display: flex;
  align-items: stretch;
  height: 100%;
  margin-right: .5rem;
  flex-shrink: 0;
}
.menu-item { position: relative; }
.menu-trigger {
  height: 100%;
  padding: 0 .55rem;
  font-size: .72rem;
  font-weight: 500;
  color: #555;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: 0;
  transition: background .1s, color .1s;
  white-space: nowrap;
}
.menu-trigger:hover,
.menu-item.is-open > .menu-trigger {
  background: var(--accent-bg);
  color: var(--accent);
}
.menu-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 165px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 4px 18px rgba(0,0,0,.12);
  list-style: none;
  padding: .2rem 0;
  z-index: 200;
}
.menu-item.is-open > .menu-dropdown { display: block; }
.menu-dropdown li > button {
  width: 100%;
  padding: .28rem .9rem;
  font-size: .72rem;
  color: #444;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  white-space: nowrap;
  transition: background .1s;
}
.menu-dropdown li > button:hover {
  background: var(--accent-bg);
  color: var(--accent);
}
.menu-sep {
  height: 1px;
  background: var(--border);
  margin: .2rem 0;
}

/* ── Dialog ─────────────────────────────────────── */
.dialog-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  align-items: center;
  justify-content: center;
}
.dialog-overlay.is-open { display: flex; }
.dialog-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(24, 22, 20, .42);
}
.dialog-panel {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 10px 48px rgba(0,0,0,.2);
  display: flex;
  flex-direction: column;
  width: min(720px, 92vw);
  height: min(580px, 86vh);
  overflow: hidden;
}
.dialog-hd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .6rem 1rem;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: .85rem;
  flex-shrink: 0;
  background: #faf9f7;
}
.dialog-close-btn {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 4px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: .95rem;
  color: #999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .1s;
}
.dialog-close-btn:hover { background: #eee; color: #555; }
.dialog-toolbar {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .38rem .75rem;
  border-bottom: 1px solid var(--border);
  background: #f7f6f3;
  flex-wrap: wrap;
  flex-shrink: 0;
}
.log-level-filters {
  display: flex;
  gap: .45rem;
  align-items: center;
}
.log-level-label {
  display: flex;
  align-items: center;
  gap: .22rem;
  font-size: .64rem;
  font-weight: 700;
  cursor: pointer;
  user-select: none;
  letter-spacing: .03em;
}
.log-level-label.debug { color: #888; }
.log-level-label.info  { color: #2868b8; }
.log-level-label.warn  { color: #c07020; }
.log-level-label.error { color: #c83060; }
.log-filter-input {
  flex: 1;
  min-width: 110px;
  padding: .22rem .5rem;
  font-size: .7rem;
  border: 1px solid #d0ccc4;
  border-radius: 3px;
  background: #fff;
  color: var(--text);
  outline: none;
}
.log-filter-input:focus { border-color: var(--accent); }
.dialog-toolbar-actions {
  display: flex;
  gap: .3rem;
  margin-left: auto;
}
.btn-tool {
  padding: .22rem .55rem;
  font-size: .65rem;
  font-weight: 600;
  border: 1px solid #d0ccc4;
  border-radius: 3px;
  background: var(--surface);
  color: #555;
  cursor: pointer;
  transition: all .1s;
  white-space: nowrap;
}
.btn-tool:hover { background: var(--accent-bg); color: var(--accent); border-color: #a0b0e0; }
.btn-danger { color: #c83060; border-color: #e8c0c8; }
.btn-danger:hover { background: #fde8ef; border-color: #c83060; }
.dialog-body {
  flex: 1;
  overflow: hidden;
  min-height: 0;
}
.log-output {
  height: 100%;
  overflow-y: auto;
  padding: .2rem 0;
  font-family: 'Consolas', 'Menlo', 'Monaco', 'Courier New', monospace;
  font-size: .69rem;
  line-height: 1.55;
}
.log-row {
  display: flex;
  gap: .65rem;
  padding: .04rem .75rem;
  transition: background .08s;
}
.log-row:hover { background: #f5f3ef; }
.log-ts {
  color: #b8b0a4;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
  min-width: 10ch;
}
.log-lvl {
  flex-shrink: 0;
  width: 3.4em;
  font-weight: 700;
}
.log-msg {
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-all;
}
.log-empty {
  padding: 2rem 1rem;
  text-align: center;
  color: var(--text-dim);
  font-style: italic;
  font-size: .75rem;
}
.dialog-ft {
  padding: .28rem .75rem;
  border-top: 1px solid var(--border);
  background: #f7f6f3;
  flex-shrink: 0;
}
.log-count {
  font-size: .6rem;
  color: var(--text-dim);
}

/* ── East Panel (optional) ──────────────────────── */
[data-role="east"] {
  grid-row: 2; grid-column: 3;
  width: var(--east-w);
  overflow-y: auto;
  background: #faf9f7;
  border-left: 1px solid var(--border);
  padding: .6rem;
  font-size: .78rem;
}
[data-role="east"][hidden] { display: none; }

.east-header {
  font-size: .6rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: #999;
  margin: 0 0 .5rem;
}

.vocab-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.vocab-entry {
  padding: .35rem .5rem;
  border-radius: 4px;
  transition: background .15s;
}
.vocab-entry[data-highlighted] {
  background: #e4e9f8;
}
.vocab-term {
  font-weight: 600;
  font-size: .76rem;
  color: var(--accent);
}
.vocab-entry[data-highlighted] .vocab-term {
  color: #2a4080;
  font-weight: 700;
}
.vocab-def {
  font-size: .7rem;
  color: #666;
  margin-top: .1rem;
}
.vocab-entry[data-highlighted] .vocab-def {
  color: #444;
}

/* ── Footer ─────────────────────────────────────── */
[data-role="footer"] {
  grid-row: 3; grid-column: 1 / -1;
  padding: 0 1rem;
  height: 1.4rem;
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  font-size: .6rem;
  color: #ccc;
}

.menu-dropdown button:disabled { opacity: .45; cursor: not-allowed; }