:root {
  --bg: #f7f7f4;
  --surface: #ffffff;
  --text: #1d1f23;
  --muted: #62666d;
  --border: #dcdcd6;
  --accent: #2f6fdb;
  --accent-soft: #e4ecfb;

  /* Joonise värvid – plot.js loeb need CSS-ist */
  --plot-bg: #ffffff;
  --plot-grid: #ececec;
  --plot-axis: #3a3d42;
  --plot-label: #62666d;
  --c1: #2f6fdb;
  --c2: #d6453d;
  --c3: #2a9d5c;
  --c4: #d88a1c;
  --c5: #8a4fd0;

  --radius: 10px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c;
    --surface: #1f2227;
    --text: #e8e9eb;
    --muted: #9ea3aa;
    --border: #33373e;
    --accent: #6d9cf0;
    --accent-soft: #24324a;
    --plot-bg: #1b1d21;
    --plot-grid: #2a2d33;
    --plot-axis: #c8cbd0;
    --plot-label: #9ea3aa;
    --c1: #6d9cf0;
    --c2: #f0736b;
    --c3: #56c386;
    --c4: #f0b050;
    --c5: #b58af0;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a { color: var(--accent); }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px 48px;
  flex: 1;
}

/* Päis ja jalus */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand {
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--text);
}
.brand span { color: var(--accent); }
.site-header nav a { text-decoration: none; margin-left: 16px; }
.site-footer {
  text-align: center;
  color: var(--muted);
  font-size: .85rem;
  padding: 16px;
  border-top: 1px solid var(--border);
}

/* Avaleht */
.hero { padding: 32px 0 8px; }
.hero h1 { margin: 0 0 4px; }
.hero p { color: var(--muted); margin: 0; }
.category h2 { font-size: 1.1rem; margin: 32px 0 12px; color: var(--muted); }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-decoration: none;
  color: var(--text);
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { margin: 4px 0; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: .92rem; }
.card-grade {
  font-size: .75rem;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 99px;
}
.empty { color: var(--muted); margin-top: 32px; }

/* Teemaleht */
.topic-head { padding: 20px 0 12px; }
.topic-head h1 { margin: 4px 0 0; }
.topic-head .back { text-decoration: none; font-size: .9rem; }
.topic-head .meta { color: var(--muted); margin: 0; font-size: .9rem; }

.topic-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 16px;
  align-items: start;
}
@media (max-width: 800px) {
  .topic-layout { grid-template-columns: 1fr; }
}

.stage-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}
.stage-wrap {
  background: var(--plot-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  position: relative;
}
.stage-wrap.wide { aspect-ratio: 5 / 2; }
.stage-wrap[hidden] { display: none; }
.stage-wrap canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.controls {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.controls:empty { display: none; }

.explanation {
  max-width: 75ch;
  margin-top: 24px;
}

.explanation table { border-collapse: collapse; margin: 8px 0; }
.explanation th, .explanation td {
  border: 1px solid var(--border);
  padding: 4px 12px;
  text-align: center;
}
.explanation th { background: var(--surface); }

/* Juhtelemendid (controls.js) */
.ctl-slider label {
  display: flex;
  justify-content: space-between;
  font-size: .9rem;
  margin-bottom: 4px;
}
.ctl-slider output { font-variant-numeric: tabular-nums; font-weight: 600; }
.ctl-slider input[type=range] { width: 100%; accent-color: var(--accent); }
.ctl-check { display: flex; align-items: center; gap: 8px; font-size: .9rem; }
.ctl-check input { accent-color: var(--accent); }
.ctl-button {
  font: inherit;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--accent-soft);
  color: var(--text);
  cursor: pointer;
}
.ctl-button:hover { border-color: var(--accent); }
.ctl-readout {
  font-size: .95rem;
  padding: 8px 10px;
  background: var(--bg);
  border-radius: 6px;
  border: 1px solid var(--border);
}
.ctl-number { display: flex; gap: 8px; align-items: end; }
.ctl-number label { display: flex; flex-direction: column; font-size: .9rem; flex: 1; min-width: 0; }
.ctl-number .ctl-button { padding: 6px 10px; }
.ctl-number input {
  font: inherit;
  padding: 5px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  width: 100%;
}
.ctl-row { display: flex; gap: 8px; flex-wrap: wrap; }
.ctl-row .ctl-button { flex: 1; }
.ctl-heading { font-size: .8rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; margin-bottom: -6px; }
.ctl-segmented {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.ctl-segmented button {
  flex: 1;
  font: inherit;
  font-size: .88rem;
  padding: 7px 6px;
  border: 0;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}
.ctl-segmented button + button { border-left: 1px solid var(--border); }
.ctl-segmented button[aria-checked="true"] { background: var(--accent); color: var(--surface); font-weight: 600; }
.ctl-readout table { border-collapse: collapse; margin: 6px 0; font-size: .88rem; }
.ctl-readout th, .ctl-readout td { padding: 2px 8px; text-align: center; border-bottom: 1px solid var(--border); }
.ctl-readout th:first-child, .ctl-readout td:first-child { text-align: left; }
.legend-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; vertical-align: middle; }