:root {
  --bg: #f6f5f1;
  --card: #ffffff;
  --text: #1d1d1b;
  --muted: #6b6a64;
  --border: #e3e1da;
  --accent: #e2661c;
  --accent-soft: rgba(226, 102, 28, 0.12);
  --good: #1f8a4c;
  --bad: #c0392b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151514;
    --card: #1f1f1d;
    --text: #f0efe9;
    --muted: #a3a29b;
    --border: #33322f;
    --accent: #f08a3e;
    --accent-soft: rgba(240, 138, 62, 0.15);
    --good: #4cc27f;
    --bad: #ef6b5b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 16px 48px;
}

h1 { font-size: 2rem; margin: 0 0 4px; }
h2 { font-size: 1rem; margin: 0 0 12px; color: var(--muted); font-weight: 600; }
.sub { margin: 0 0 24px; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 16px;
}

.tabs { display: flex; gap: 8px; margin-bottom: 12px; }
.tab {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 8px 16px;
  border-radius: 999px;
  font: inherit;
  cursor: pointer;
}
.tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.field { display: flex; flex-direction: column; gap: 6px; flex: 1; min-width: 0; }
.field span { font-size: 0.85rem; color: var(--muted); }
.field + .row, .row + .row { margin-top: 16px; }

input, select {
  font: inherit;
  font-size: 1.1rem;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  width: 100%;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.row { display: flex; gap: 12px; align-items: flex-end; }
.row[hidden] { display: none; }

.swap {
  font-size: 1.2rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  border-radius: 10px;
  height: 46px;
  width: 46px;
  flex: none;
  cursor: pointer;
}

.headline { font-size: 1.25rem; margin: 0 0 16px; }
.headline strong { color: var(--accent); font-size: 1.6rem; display: block; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.stats div { background: var(--bg); border-radius: 10px; padding: 12px; }
.label { display: block; font-size: 0.8rem; color: var(--muted); }
.value { font-size: 1.15rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.note { margin: 12px 0 0; font-size: 0.85rem; color: var(--muted); }
.note:empty { display: none; }

.chart svg { width: 100%; height: auto; display: block; }
.chart text { fill: var(--muted); font-size: 11px; }
.chart .grid { stroke: var(--border); }
.chart .line { stroke: var(--accent); stroke-width: 2.5; fill: none; }
.chart .area { fill: var(--accent-soft); }
.chart .dot { fill: var(--accent); }

footer { font-size: 0.8rem; color: var(--muted); text-align: center; margin-top: 24px; }

@media (max-width: 560px) {
  main { padding: 20px 12px 36px; }
  h1 { font-size: 1.6rem; }
  .sub { margin-bottom: 16px; font-size: 0.95rem; }
  .card { padding: 16px; border-radius: 12px; }
  .tabs .tab { flex: 1; padding: 10px 8px; }
  .row { gap: 8px; }
  .row[data-show="future"] { flex-wrap: wrap; }
  .row[data-show="future"] .field { flex-basis: 100%; }
  select { padding: 10px 8px; }
  .swap { width: 40px; }
  .headline { font-size: 1.05rem; }
  .headline strong { font-size: 1.45rem; }
  /* Stats as compact label/value rows instead of three tall boxes. */
  .stats { grid-template-columns: 1fr; gap: 6px; }
  .stats div { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding: 10px 12px; }
  .label { font-size: 0.85rem; }
  .value { font-size: 1.05rem; text-align: right; }
}

.headline small { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 4px; }