:root {
  --bg: #f6f6fb;
  --surface: #ffffff;
  --surface-2: #f3f2fb;
  --text: #1c1b33;
  --muted: #6b6a85;
  --border: #e4e2f0;
  --accent: #5b4cf0;
  --accent-2: #7c3aed;
  --accent-soft: #ecebfe;
  --orange: #f97316;
  --good: #059669;
  --good-soft: #d1fae5;
  --warn: #b45309;
  --warn-soft: #fef3c7;
  --bad: #dc2626;
  --bad-soft: #fee2e2;
  --highlight: #fff4c2;
  --grid: rgba(28, 27, 51, 0.07);
  --hero: linear-gradient(120deg, #1e1b4b 0%, #3730a3 50%, #6d28d9 100%);
  --result: linear-gradient(150deg, #312e81 0%, #4c1d95 100%);
  --shadow: 0 1px 2px rgba(28, 27, 51, 0.04), 0 4px 16px rgba(28, 27, 51, 0.05);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e0d1a;
    --surface: #17162a;
    --surface-2: #201f37;
    --text: #ebeaf7;
    --muted: #a09fbd;
    --border: #2d2b48;
    --accent: #8b7dff;
    --accent-2: #a78bfa;
    --accent-soft: #2a2655;
    --good: #34d399;
    --good-soft: #0d3b2e;
    --warn: #fbbf24;
    --warn-soft: #3d2f0a;
    --bad: #f87171;
    --bad-soft: #3f1515;
    --highlight: #4a3f12;
    --grid: rgba(235, 234, 247, 0.08);
    --shadow: none;
  }
}
:root[data-theme="dark"] {
  --bg: #0e0d1a;
  --surface: #17162a;
  --surface-2: #201f37;
  --text: #ebeaf7;
  --muted: #a09fbd;
  --border: #2d2b48;
  --accent: #8b7dff;
  --accent-2: #a78bfa;
  --accent-soft: #2a2655;
  --good: #34d399;
  --good-soft: #0d3b2e;
  --warn: #fbbf24;
  --warn-soft: #3d2f0a;
  --bad: #f87171;
  --bad-soft: #3f1515;
  --highlight: #4a3f12;
  --grid: rgba(235, 234, 247, 0.08);
  --shadow: none;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", "Microsoft JhengHei", "Noto Sans TC", sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 16px; }
svg { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- Top bar ---------- */
.topbar { background: var(--surface); border-bottom: 1px solid var(--border); padding: 12px 0; position: sticky; top: 0; z-index: 10; }
.topbar-inner { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.logo {
  flex: none; display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px;
  background: var(--hero); color: #fff;
}
.logo svg { width: 22px; height: 22px; }
.crumbs { font-size: 0.75rem; color: var(--muted); }
h1 { font-size: 1.15rem; margin: 0; }
.tag {
  display: inline-block; vertical-align: middle; margin-left: 4px;
  font-size: 0.7rem; font-weight: 700; padding: 2px 8px; border-radius: 999px;
  background: var(--accent); color: #fff;
}
.problem-pick { display: flex; flex-direction: column; gap: 3px; font-size: 0.78rem; color: var(--muted); }
.problem-pick select { font-size: 0.92rem; font-weight: 600; min-width: min(360px, 100%); border-color: var(--accent); }

main { padding-top: 20px; padding-bottom: 12px; }

/* ---------- Hero ---------- */
.hero {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  background: var(--hero); color: #fff;
  border-radius: 16px; padding: 26px 30px; margin-bottom: 16px; overflow: hidden;
}
.hero-text { min-width: 0; }
.eyebrow { font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; opacity: 0.75; font-weight: 700; }
.hero h2 { font-size: 1.6rem; margin: 4px 0 8px; line-height: 1.25; }
.hero p { margin: 0 0 14px; opacity: 0.88; max-width: 720px; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 8px; }
.hero-badges span {
  background: rgba(255, 255, 255, 0.14); border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 3px 12px; border-radius: 999px; font-size: 0.82rem; font-weight: 600;
}
.hero-badges span.hot { background: #10b981; border-color: #10b981; }
.hero-badges span.warm { background: #f97316; border-color: #f97316; }
.hero-art { flex: none; width: 280px; height: 190px; color: #fff; }
.hero-art .grid { stroke: rgba(255, 255, 255, 0.08); stroke-width: 1; }
.hero-art .axis { stroke: rgba(255, 255, 255, 0.45); }
.hero-art .band { fill: rgba(255, 255, 255, 0.10); stroke: none; }
.hero-art .dots circle { fill: rgba(255, 255, 255, 0.85); stroke: none; }
.hero-art .hot { fill: #f97316; stroke: #fff; stroke-width: 2; }
.hero-art .fit { stroke: #fbbf24; stroke-width: 3; }
.hero-art .bars rect { fill: rgba(255, 255, 255, 0.25); stroke: none; }
.hero-art text { fill: rgba(255, 255, 255, 0.8); stroke: none; font: 600 12px ui-monospace, Consolas, monospace; }
@media (max-width: 760px) { .hero-art { display: none; } .hero { padding: 22px 20px; } .hero h2 { font-size: 1.3rem; } }

/* ---------- CRISP-DM strip ---------- */
.crisp { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; margin-bottom: 18px; }
.crisp a {
  position: relative; display: flex; align-items: center; gap: 8px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 10px 12px; font-size: 0.78rem; line-height: 1.25; color: var(--text); text-decoration: none;
  box-shadow: var(--shadow);
}
.crisp a:hover { border-color: var(--accent); }
.crisp b {
  flex: none; display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent); font-size: 0.8rem;
}
@media (max-width: 900px) { .crisp { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 480px) { .crisp { grid-template-columns: repeat(2, 1fr); } }

/* ---------- Cards ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 18px 20px; margin-bottom: 18px; min-width: 0; box-shadow: var(--shadow);
}
.card-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
h2 { font-size: 1.02rem; margin: 0; display: flex; align-items: center; gap: 8px; }
.ico { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--accent-soft); color: var(--accent); }
.ico svg { width: 16px; height: 16px; }
.pill-note {
  font-size: 0.74rem; font-weight: 600; color: var(--accent);
  background: var(--accent-soft); padding: 2px 10px; border-radius: 999px; white-space: nowrap;
}
.muted { color: var(--muted); }
.small { font-size: 0.84rem; }
p.small { margin: 0 0 10px; }

/* ---------- Form controls ---------- */
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 10px 0; }
.grow { flex: 1 1 280px; min-width: 0; }
input, select, button, .btn {
  font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 9px; padding: 7px 10px;
}
button, .btn { cursor: pointer; background: var(--surface-2); }
button:hover, .btn:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); font-weight: 600; }
.chip { border-radius: 999px; padding: 3px 12px; font-size: 0.85rem; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 0.84rem; color: var(--muted); }
label > select, label > input { color: var(--text); }

.status { font-size: 0.9rem; min-height: 1.4em; }
.status.error { color: var(--bad); }
.status.ok { color: var(--good); }

.grid-config { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin: 10px 0 14px; }
.feat-pick { margin-bottom: 12px; }
.checks { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.checks label {
  flex-direction: row; align-items: center; gap: 6px;
  border: 1px solid var(--border); border-radius: 999px; padding: 3px 10px; color: var(--text); cursor: pointer;
}
.checks .type { color: var(--muted); font-size: 0.74rem; }
details summary { cursor: pointer; color: var(--accent); font-size: 0.9rem; margin: 6px 0; }

/* ---------- Pills (algorithm / k) ---------- */
.label-row { font-size: 0.78rem; font-weight: 700; color: var(--muted); letter-spacing: 0.04em; margin: 4px 0 8px; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.pills button {
  display: inline-flex; align-items: center; gap: 6px; border-radius: 10px;
  background: var(--surface); font-size: 0.87rem; font-weight: 600; padding: 7px 12px;
}
.pills button .sub { font-size: 0.7rem; font-weight: 700; padding: 1px 7px; border-radius: 999px; background: var(--surface-2); color: var(--muted); }
.pills button .dot { width: 9px; height: 9px; border-radius: 50%; }
.pills button.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.pills button.on .sub { background: rgba(255, 255, 255, 0.22); color: #fff; }
.pills button.best:not(.on) { border-color: var(--good); }
.pills button.best .sub { background: var(--good-soft); color: var(--good); }
.pills button.full:not(.on) { border-color: var(--orange); }
.pills button.full .sub { background: var(--warn-soft); color: var(--warn); }

/* ---------- KPI tiles ---------- */
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin-bottom: 14px; }
.kpi {
  position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 14px 16px; min-width: 0; box-shadow: var(--shadow);
}
.kpi.lead { border-color: var(--accent); }
.kpi .top { display: flex; align-items: center; justify-content: space-between; gap: 6px; }
.kpi .label { color: var(--muted); font-size: 0.74rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; }
.kpi .ico { width: 30px; height: 30px; }
.kpi .value { font-size: 1.45rem; font-weight: 800; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; margin-top: 4px; }
.kpi.lead .value { color: var(--accent); }
.kpi .hint { color: var(--muted); font-size: 0.78rem; overflow-wrap: anywhere; }
.kpi .badge { margin-top: 6px; }
.kpi.wide { grid-column: 1 / -1; }

.active-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: -2px 0 16px; font-size: 0.85rem; }
.active-row .feat { background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: 2px 10px; font-weight: 600; }
.active-row .note { margin-left: auto; color: var(--good); background: var(--good-soft); border-radius: 999px; padding: 2px 10px; font-weight: 600; }

/* ---------- Equation ---------- */
.equation-card {
  background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--accent);
  border-radius: 12px; padding: 12px 16px; margin-bottom: 18px; box-shadow: var(--shadow);
}
.eq-label { font-size: 0.74rem; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; color: var(--accent); margin-bottom: 4px; }
.equation { font-family: ui-monospace, Consolas, monospace; font-size: 0.9rem; overflow-wrap: anywhere; }
.equation b { color: var(--accent); }

/* ---------- Tables ---------- */
.table-scroll { overflow-x: auto; }
table.data { border-collapse: collapse; width: 100%; font-size: 0.86rem; }
table.data th, table.data td { padding: 8px 10px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; }
table.data th { color: var(--muted); font-size: 0.74rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; background: var(--surface-2); }
table.num td { font-variant-numeric: tabular-nums; }
table.num td:not(:first-child), table.num th:not(:first-child) { text-align: right; }
td.best-row { font-weight: 800; }
td.best-all { background: var(--highlight); }
td.clickable { cursor: pointer; }
td.clickable:hover { outline: 2px solid var(--accent); outline-offset: -2px; }
td.sel { box-shadow: inset 0 0 0 2px var(--accent); }
.pos { color: var(--good); }
.neg { color: var(--bad); }
.badge { display: inline-block; padding: 1px 9px; border-radius: 999px; font-size: 0.74rem; font-weight: 700; }
.badge.good { color: var(--good); background: var(--good-soft); }
.badge.warn { color: var(--warn); background: var(--warn-soft); }
.badge.bad { color: var(--bad); background: var(--bad-soft); }
.badge.info { color: var(--accent); background: var(--accent-soft); }

/* ---------- Layout ---------- */
.two-col { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(460px, 100%), 1fr)); gap: 18px; }
.two-col[hidden] { display: none; }
.chart-box { position: relative; height: 300px; }

/* ---------- Heatmap ---------- */
.heatmap-scroll { overflow-x: auto; }
.heatmap { display: grid; gap: 3px; font-size: 0.74rem; font-variant-numeric: tabular-nums; width: max-content; min-width: 100%; }
.heatmap .hcell {
  display: grid; place-items: center; min-width: 38px; height: 34px; border-radius: 6px;
  font-weight: 700; color: var(--text);
}
.heatmap .hcell.dark { color: #fff; }
.heatmap .rlabel { display: flex; align-items: center; justify-content: flex-end; padding-right: 6px; color: var(--muted); white-space: nowrap; max-width: 160px; overflow: hidden; text-overflow: ellipsis; }
.heatmap .clabel { display: flex; align-items: flex-end; justify-content: center; color: var(--muted); writing-mode: vertical-rl; transform: rotate(180deg); max-height: 110px; padding: 4px 0; overflow: hidden; white-space: nowrap; }
.heat-legend { display: flex; align-items: center; gap: 8px; margin-top: 10px; font-size: 0.76rem; color: var(--muted); }
.heat-legend .bar { flex: 0 1 200px; height: 10px; border-radius: 999px; }

/* ---------- Predictor ---------- */
.predict-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 18px; margin-bottom: 18px; }
.predict-grid .card { margin-bottom: 0; }
@media (max-width: 820px) { .predict-grid { grid-template-columns: 1fr; } }
.predict-form { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.slider-field .head { display: flex; justify-content: space-between; gap: 6px; color: var(--text); font-weight: 600; }
.slider-field .head span { color: var(--accent); font-variant-numeric: tabular-nums; }
.slider-field input[type="range"] { width: 100%; padding: 0; accent-color: var(--accent); border: 0; background: none; }
.slider-field input[type="number"] { width: 100%; }
.result-card {
  background: var(--result); color: #fff; border-radius: 16px; padding: 22px;
  display: flex; flex-direction: column; gap: 10px; min-width: 0;
}
.result-card .label { font-size: 0.76rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; opacity: 0.75; }
.result-card .big { font-size: 2.1rem; font-weight: 800; color: #6ee7b7; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.result-card .sub { font-size: 0.82rem; opacity: 0.8; }
.contrib { display: flex; flex-direction: column; gap: 6px; margin-top: 4px; }
.contrib .line { display: grid; grid-template-columns: minmax(70px, 1fr) 2fr auto; align-items: center; gap: 8px; font-size: 0.78rem; }
.contrib .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; opacity: 0.85; }
.contrib .track { position: relative; height: 8px; background: rgba(255, 255, 255, 0.12); border-radius: 999px; overflow: hidden; }
.contrib .fill { position: absolute; top: 0; bottom: 0; border-radius: 999px; }
.contrib .val { font-variant-numeric: tabular-nums; text-align: right; }

/* ---------- Footer ---------- */
.foot { background: var(--surface); border-top: 1px solid var(--border); margin-top: 10px; padding: 22px 0; }
.foot-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 18px; }
.foot-inner p { margin: 4px 0 0; max-width: 520px; }
.foot-inner ul { margin: 4px 0 0; padding-left: 18px; color: var(--muted); }