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

:root {
  --bg: #f6f5f1;
  --card: #fffefb;
  --ink: #1b1c1e;
  --muted: #6b6f76;
  --line: #e4e2da;
  --accent: #2456c8;
  --accent-soft: rgba(36, 86, 200, 0.10);
  --up: #b23c10;    /* prices rising */
  --down: #0d7a6c;  /* prices falling */
  --radius: 14px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131417; --card: #1b1d22; --ink: #e9e7e2; --muted: #9a9ea6;
    --line: #2a2d33; --accent: #7aa2ff; --accent-soft: rgba(122, 162, 255, 0.14);
    --up: #ff8a5c; --down: #4fd0bd;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, "Segoe UI", system-ui, -apple-system, sans-serif;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}
.wrap { max-width: 900px; margin: 0 auto; padding: 0 20px; }
a { color: var(--accent); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0;
}

/* Header */
.site-header { border-bottom: 1px solid var(--line); }
.header-row { display: flex; align-items: baseline; justify-content: space-between; padding: 14px 20px; }
.brand { font-weight: 700; font-size: 1.15rem; color: var(--ink); text-decoration: none; }
.brand-sub { font-weight: 400; color: var(--muted); font-size: 0.9rem; margin-left: 6px; }
.lang button {
  background: none; border: 1px solid transparent; border-radius: 8px;
  color: var(--muted); font: inherit; font-size: 0.85rem; padding: 3px 8px; cursor: pointer;
}
.lang button[aria-pressed="true"] { color: var(--ink); border-color: var(--line); background: var(--card); }

/* Headline */
.headline { padding: 44px 0 28px; }
.headline h1 { font-size: 1.05rem; font-weight: 500; color: var(--muted); margin: 0; }
.big-number {
  font-size: clamp(3.6rem, 13vw, 6.5rem);
  font-weight: 700; letter-spacing: -0.03em; line-height: 1.05;
  margin: 4px 0 12px; font-variant-numeric: tabular-nums;
}
.sub-numbers { display: flex; gap: 36px; margin: 0; }
.sub-numbers dt { font-size: 0.82rem; color: var(--muted); }
.sub-numbers dd { margin: 0; font-size: 1.35rem; font-weight: 600; font-variant-numeric: tabular-nums; }

/* Cards / sections */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 22px 22px; margin-bottom: 22px; position: relative;
}
.card h2 { margin: 0; font-size: 1.05rem; }
.card-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
.section-sub { color: var(--muted); font-size: 0.88rem; margin: 4px 0 14px; }
.placeholder { color: var(--muted); font-size: 0.9rem; }

/* Segmented controls */
.controls { display: flex; flex-wrap: wrap; gap: 8px; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.seg button {
  background: none; border: 0; color: var(--muted); font: inherit; font-size: 0.82rem;
  padding: 5px 11px; cursor: pointer; white-space: nowrap;
}
.seg button + button { border-left: 1px solid var(--line); }
.seg button[aria-pressed="true"] { background: var(--accent-soft); color: var(--ink); font-weight: 600; }
/* .seg clips overflow, so focus rings must sit inside the buttons */
.seg button:focus-visible, .lang button:focus-visible {
  outline: 2px solid var(--accent); outline-offset: -2px;
}

/* Chart */
.chart svg { display: block; width: 100%; height: auto; }
.chart svg:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.chart .grid { stroke: var(--line); stroke-width: 1; }
.chart .zero { stroke: var(--muted); stroke-width: 1; stroke-dasharray: 3 3; }
.chart .tick { fill: var(--muted); font-size: 11px; }
.chart .line { fill: none; stroke: var(--accent); stroke-width: 2; stroke-linejoin: round; }
.chart .area { fill: var(--accent-soft); stroke: none; }
.chart .guide { stroke: var(--muted); stroke-width: 1; }
.chart .dot { fill: var(--accent); }
.tooltip {
  position: absolute; pointer-events: none; background: var(--ink); color: var(--bg);
  font-size: 0.8rem; padding: 4px 8px; border-radius: 7px; white-space: nowrap; z-index: 2;
}

/* Group bars */
.grow {
  display: grid; grid-template-columns: minmax(120px, 38%) 1fr 64px;
  align-items: center; gap: 10px; padding: 5px 0; font-size: 0.9rem;
}
.grow.total { font-weight: 700; border-bottom: 1px solid var(--line); padding-bottom: 9px; margin-bottom: 5px; }
.glabel { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.gbar-wrap { background: none; height: 12px; position: relative; }
.gbar { position: absolute; top: 0; bottom: 0; border-radius: 3px; min-width: 2px; }
.gbar.up { background: var(--up); }
.gbar.down { background: var(--down); }
.gval { text-align: right; font-variant-numeric: tabular-nums; }
.gval.up { color: var(--up); }
.gval.down { color: var(--down); }

/* Forms */
form .field { display: inline-flex; flex-direction: column; gap: 4px; margin: 0 18px 12px 0; }
form label, .field-label { font-size: 0.8rem; color: var(--muted); }
input[type="number"], select {
  font: inherit; color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px;
}
input[type="number"] { width: 110px; }
.period { display: inline-flex; gap: 6px; }
.result { font-size: 1.05rem; }
.result .lead { font-size: 1.25rem; font-weight: 600; margin: 6px 0 2px; }
.result .muted, .muted { color: var(--muted); font-size: 0.9rem; }

/* Comparison table */
table { border-collapse: collapse; width: 100%; font-size: 0.9rem; }
th, td { text-align: left; padding: 6px 8px 6px 0; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 500; font-size: 0.8rem; }
tbody th { color: var(--ink); font-weight: 400; font-size: inherit; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
tr.total td, tr.total th { font-weight: 700; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); margin-top: 36px; padding: 18px 0 30px; color: var(--muted); font-size: 0.85rem; }
.site-footer p { margin: 4px 0; }

@media (max-width: 560px) {
  .sub-numbers { gap: 22px; }
  .grow { grid-template-columns: minmax(100px, 44%) 1fr 56px; font-size: 0.84rem; }
}

@media (pointer: coarse) {
  .seg button { padding: 10px 13px; }
  .lang button { padding: 8px 12px; }
  input[type="number"], select { padding: 10px 9px; }
}