@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@300;400;500&family=Syne:wght@400;500;700&display=swap');

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

:root {
  --bg:      #0f1117;
  --bg2:     #181c26;
  --bg3:     #1f2335;
  --border:  #2a2f45;
  --accent:  #4fc3f7;
  --muted:   #556080;
  --text:    #c8d0e8;
  --text2:   #8891b0;
  --web:     #e8d5a3;
  --pos:     #4ade80;
  --neg:     #f472b6;
  --warn:    #fbbf24;
  --err:     #f87171;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Mono', monospace;
  font-size: 13px;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  flex-shrink: 0;
  gap: 8px;
}

header h1 {
  font-family: 'Syne', sans-serif;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
}

.hbtns { display: flex; gap: 6px; flex-wrap: wrap; }

button {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 4px 10px;
  border-radius: 3px;
  cursor: pointer;
  transition: border-color 0.12s, color 0.12s, background 0.12s;
  letter-spacing: 0.03em;
  white-space: nowrap;
}
button:hover  { border-color: var(--accent); color: var(--accent); }
button.active { border-color: var(--accent); color: var(--accent); background: rgba(79,195,247,0.08); }
button.warn   { border-color: var(--warn);   color: var(--warn); }

.main { display: flex; flex: 1; overflow: hidden; }

#canvas-container {
  flex: 1;
  min-width: 0;
  min-height: 0;
  position: relative;
}

canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  cursor: default;
  touch-action: none;
}

.sidebar {
  width: 210px;
  background: var(--bg2);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
}

.sb-head {
  font-family: 'Syne', sans-serif;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 10px 13px 5px;
}

.sb-section { border-bottom: 1px solid var(--border); padding-bottom: 10px; margin-bottom: 0; }

.roller-list { flex: 1; overflow-y: auto; }

.roller-item {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 13px;
  cursor: pointer;
  border-left: 2px solid transparent;
  transition: background 0.1s;
}
.roller-item:hover    { background: var(--bg3); }
.roller-item.sel      { background: var(--bg3); border-left-color: var(--accent); }
.roller-item.terminal { opacity: 0.6; }

.ri-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  border: 1.5px solid var(--muted);
  flex-shrink: 0;
}
.ri-dot.pos { border-color: var(--pos); background: rgba(74,222,128,0.2); }
.ri-dot.neg { border-color: var(--neg); background: rgba(244,114,182,0.2); }

.ri-name  { flex: 1; font-size: 11px; color: var(--text); }
.ri-wrap  { font-size: 10px; color: var(--text2); min-width: 38px; text-align: right; }
.ri-wrap.warn { color: var(--warn); }

.props { padding: 10px 13px; border-bottom: 1px solid var(--border); }
.props.hidden { display: none; }

.pr { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; }
.pr-label { font-size: 10px; color: var(--text2); }
.pr-val   { font-size: 11px; color: var(--text); }

.badge {
  font-size: 9px; padding: 1px 6px; border-radius: 2px;
  font-weight: 500; letter-spacing: 0.05em;
}
.badge-pos  { background: rgba(74,222,128,0.12);  color: var(--pos); }
.badge-neg  { background: rgba(244,114,182,0.12); color: var(--neg); }
.badge-term { background: rgba(85,96,128,0.2);    color: var(--muted); }
.badge-warn { background: rgba(251,191,36,0.12);  color: var(--warn); }
.pol-btn {
  background: none; border: 1px solid var(--border); border-radius: 4px;
  color: inherit; cursor: pointer; font: inherit; padding: 1px 6px;
}
.pol-btn:hover { background: rgba(255,255,255,0.08); }

input[type=range] {
  -webkit-appearance: none;
  width: 100%; height: 3px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  margin: 3px 0 8px;
  cursor: pointer;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.diag {
  padding: 8px 13px;
  font-size: 10px;
  color: var(--err);
  line-height: 1.6;
  min-height: 20px;
  border-bottom: 1px solid var(--border);
}
.diag:empty { display: none; }

.hint {
  padding: 10px 13px;
  font-size: 10px;
  color: var(--muted);
  line-height: 1.7;
  margin-top: auto;
}

.legend { padding: 8px 13px 10px; border-bottom: 1px solid var(--border); }
.leg-row { display: flex; align-items: center; gap: 7px; font-size: 10px; color: var(--text2); margin-bottom: 4px; }
.leg-line { width: 18px; height: 2px; border-radius: 1px; flex-shrink: 0; }
.leg-dot  { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }

/* ── Docs Panel ── */
.docs-panel {
  display: none;
  flex: 1;
  overflow-y: auto;
  background: var(--bg);
  font-family: 'DM Sans', 'Segoe UI', sans-serif;
  font-size: 14px;
  line-height: 1.75;
}

.docs-panel.shown { display: block; }

.docs-inner {
  max-width: 680px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

.docs-panel h2 {
  font-family: 'Syne', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin: 48px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.docs-panel h3 {
  font-family: 'Syne', sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  margin: 28px 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.docs-panel p { margin-bottom: 14px; }

.docs-panel ol, .docs-panel ul {
  margin-left: 20px;
  margin-bottom: 16px;
}

.docs-panel li { margin-bottom: 4px; }

.docs-panel a { color: var(--accent); text-decoration: none; }
.docs-panel a:hover { text-decoration: underline; }

.docs-panel .math-block {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 16px 20px;
  margin: 20px 0;
  overflow-x: auto;
}

.docs-panel .katex-display { margin: 0 !important; }

.docs-panel .callout {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 14px 18px;
  margin: 20px 0;
  font-size: 13px;
  color: var(--text2);
}

.docs-panel .callout strong { color: var(--accent); }

.docs-panel .warn-callout { border-left-color: var(--warn); }
.docs-panel .warn-callout strong { color: var(--warn); }

.docs-panel .toc {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 32px 0 40px;
}

.docs-panel .toc h4 {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}

.docs-panel .toc ol { padding-left: 20px; }
.docs-panel .toc li { margin-bottom: 4px; font-size: 13px; }
.docs-panel .toc a { color: var(--text2); }
.docs-panel .toc a:hover { color: var(--accent); }

.docs-panel .badge {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 3px;
  vertical-align: middle;
  display: inline-block;
}

.docs-panel .badge-pos { background: rgba(74, 222, 128, 0.12); color: var(--pos); }
.docs-panel .badge-neg { background: rgba(244, 114, 182, 0.12); color: var(--neg); }

.docs-panel table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 20px 0;
}

.docs-panel th {
  background: var(--bg3);
  color: var(--text2);
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 8px 12px;
  border: 1px solid var(--border);
  text-align: left;
}

.docs-panel td {
  padding: 8px 12px;
  border: 1px solid var(--border);
  vertical-align: top;
}

.docs-panel tr:nth-child(even) td { background: var(--bg2); }

.docs-panel .footnote { font-size: 12px; color: var(--muted); margin-top: 4px; }

.docs-panel code {
  font-family: 'DM Mono', monospace;
  font-size: 0.85em;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 4px;
  color: var(--accent);
}

.docs-panel pre {
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px 20px;
  overflow-x: auto;
  line-height: 1.6;
  margin: 20px 0;
  color: var(--text);
}