/*
 * Digital Strategy and Markets — shared simulation stylesheet.
 *
 * Clean academic look: single sans-serif family, monospace for numerics,
 * a blue accent matching the Beamer slide headings (#3f8db8), conventional
 * palette for data marks. All course simulations link to this file.
 */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@400;500;600&display=swap');

:root {
  --bg:          #ffffff;
  --bg-panel:    #f7f8fa;
  --bg-card:    #ffffff;
  --text:        #1f2937;
  --text-soft:   #374151;
  --muted:       #6b7280;
  --border:      #e5e7eb;
  --border-strong: #d1d5db;

  /* Data palette — close to slide colors, clean and conventional */
  --accent:    #3f8db8;   /* Nova SBE Beamer blue */
  --cost:      #c44545;   /* red — cost / opposing force */
  --gain:      #5e8c5e;   /* green — profit / welfare gain */
  --shock:     #d97743;   /* orange — shocked (non-baseline) state */
  --baseline:  #b8b8b8;   /* grey — reference baseline */

  --sans: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'JetBrains Mono', monospace;
}

* { box-sizing: border-box; }

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  max-width: 920px;
  margin: 0 auto;
  padding: 2.5rem 1.75rem 3rem;
}

/* ─── HEADER ─────────────────────────────────────────────────────────── */

header.sim-header {
  padding-bottom: 1rem;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--border);
}

header.sim-header .course {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.6rem;
}

header.sim-header h1 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.55rem;
  line-height: 1.25;
  letter-spacing: -0.005em;
  color: var(--text);
  margin: 0 0 0.8rem;
}

header.sim-header h1 em {
  font-style: normal;
  color: var(--accent);
}

header.sim-header .lead {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.55;
  color: var(--text-soft);
  margin: 0;
  max-width: 68ch;
}

header.sim-header .lead strong { font-weight: 500; color: var(--text); }
header.sim-header .lead em { font-style: italic; color: var(--text); }

/* ─── CONTROL PANEL ──────────────────────────────────────────────────── */

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1.2rem 1.3rem;
  margin: 1.5rem 0;
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem 1.75rem;
}

@media (max-width: 600px) {
  .controls { grid-template-columns: 1fr; }
}

.ctrl label {
  display: block;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-soft);
  margin-bottom: 0.45rem;
}

.ctrl label em { font-style: italic; color: var(--text); }

.ctrl .val {
  font-family: var(--mono);
  font-weight: 500;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  font-size: 0.92rem;
  margin-left: 0.25rem;
}

.ctrl input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 22px;
  background: transparent;
  cursor: pointer;
}

.ctrl input[type=range]::-webkit-slider-runnable-track {
  height: 3px;
  background: var(--border-strong);
  border-radius: 2px;
}
.ctrl input[type=range]::-moz-range-track {
  height: 3px;
  background: var(--border-strong);
  border-radius: 2px;
  border: none;
}

.ctrl input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border: 2px solid var(--bg);
  border-radius: 50%;
  margin-top: -6px;
  cursor: grab;
  box-shadow: 0 0 0 1px var(--border-strong);
  transition: transform 0.12s ease;
}
.ctrl input[type=range]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--accent);
  border: 2px solid var(--bg);
  border-radius: 50%;
  cursor: grab;
  box-shadow: 0 0 0 1px var(--border-strong);
}
.ctrl input[type=range]:hover::-webkit-slider-thumb { transform: scale(1.15); }

.ctrl .note {
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--muted);
  margin-top: 0.45rem;
}

/* Preset buttons */
.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--border);
}

.preset {
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 400;
  padding: 0.45rem 0.8rem;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 3px;
  color: var(--text-soft);
  cursor: pointer;
  transition: all 0.12s ease;
}
.preset:hover {
  border-color: var(--accent);
  color: var(--text);
}
.preset.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

/* ─── CHART ──────────────────────────────────────────────────────────── */

svg.chart {
  display: block;
  margin: 1.5rem auto 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  max-width: 100%;
  height: auto;
}

svg.chart text {
  font-family: var(--sans);
  font-weight: 400;
}

/* ─── OUTPUT CARDS ───────────────────────────────────────────────────── */

.outputs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
  margin: 1.2rem 0 0.8rem;
}

@media (max-width: 600px) {
  .outputs { grid-template-columns: 1fr; }
}

.out {
  padding: 0.9rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.out .label {
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}
.out .label em { font-style: italic; color: var(--text); }

.out .num {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 1.55rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  line-height: 1;
  color: var(--text);
  margin-bottom: 0.35rem;
}

.out .delta {
  font-size: 0.78rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.delta.up { color: var(--gain); }
.delta.down { color: var(--cost); }

/* ─── NOTE BLOCK ─────────────────────────────────────────────────────── */

.note-block {
  margin: 1.5rem 0 1rem;
  padding: 0.9rem 1.1rem;
  background: var(--bg-panel);
  border-left: 3px solid var(--accent);
  border-radius: 0 4px 4px 0;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--text-soft);
}
.note-block strong { color: var(--text); font-weight: 500; }
.note-block em { font-style: italic; color: var(--text); }

/* ─── FOOTER ─────────────────────────────────────────────────────────── */

footer.sim-footer {
  margin-top: 2rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.5;
}