:root {
  color-scheme: light;
  --bg: #f6f6f4;
  --surface: #fcfcfb;
  --border: #e3e2de;
  --text: #0b0b0b;
  --text-2: #52514e;
  --text-3: #75736e;
  --accent: #2a78d6;
  --accent-ink: #ffffff;
  --accent-soft: #e6effa;
  --bar: #2a78d6;
  --bar-hover: #1d5fae;
  --grid: #ecebe7;
  --error: #b42318;
  --error-soft: #fdecea;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.04), 0 4px 16px rgb(0 0 0 / 0.04);
  --radius: 12px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #121211;
    --surface: #1a1a19;
    --border: #2c2c2a;
    --text: #f0efec;
    --text-2: #c3c2b7;
    --text-3: #93928b;
    --accent: #3987e5;
    --accent-ink: #ffffff;
    --accent-soft: #1b2a3d;
    --bar: #3987e5;
    --bar-hover: #6aa6ee;
    --grid: #262624;
    --error: #ff8a80;
    --error-soft: #3a1d1b;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

/* Components below set display, which would otherwise override [hidden]. */
[hidden] { display: none !important; }

html, body { margin: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 var(--sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 16px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  text-decoration: none;
  font-weight: 650;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

nav { display: flex; gap: 4px; }

nav a {
  color: var(--text-2);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.95rem;
}

nav a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); }

main {
  flex: 1;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

h1 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 16px 0 8px;
}

h2 { font-size: 1rem; margin: 0 0 16px; font-weight: 600; }

.lede { color: var(--text-2); margin: 0 0 24px; max-width: 56ch; }

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

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; min-width: 0; }

.field > span { font-size: 0.875rem; font-weight: 550; color: var(--text-2); }

.field em { font-style: normal; font-weight: 400; color: var(--text-3); }

input, select {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  width: 100%;
  min-width: 0;
}

input:focus-visible, select:focus-visible, button:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

button {
  font: inherit;
  font-weight: 600;
  border-radius: 8px;
  padding: 10px 18px;
  cursor: pointer;
  border: 1px solid transparent;
}

button.primary { background: var(--accent); color: var(--accent-ink); }

button.primary:disabled { opacity: 0.6; cursor: progress; }

button.secondary { background: var(--accent-soft); color: var(--accent); }

.error {
  color: var(--error);
  background: var(--error-soft);
  border-radius: 8px;
  padding: 8px 12px;
  margin: 0 0 16px;
  font-size: 0.9rem;
}

.result { display: flex; gap: 20px; align-items: center; justify-content: space-between; }

.result-main { min-width: 0; flex: 1; }

.label { font-size: 0.8rem; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.04em; }

.short-row { display: flex; align-items: center; gap: 12px; margin: 4px 0 8px; flex-wrap: wrap; }

#short-url, .mono { font-family: var(--mono); font-size: 1.15rem; font-weight: 600; word-break: break-all; }

.muted { color: var(--text-2); }

.small { font-size: 0.85rem; }

.target { margin: 0 0 8px; overflow-wrap: anywhere; }

.text-link { font-weight: 550; text-decoration: none; }

.qr {
  width: 160px;
  height: 160px;
  border-radius: 8px;
  background: #fff;
  padding: 6px;
  flex: none;
}

.inline-form { display: flex; gap: 12px; align-items: flex-end; }

.inline-form .field { margin: 0; }

.grow { flex: 1; }

.min0 { min-width: 0; }

.stats-head { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; }

.stats-head p { margin: 4px 0 0; }

.hero { text-align: right; flex: none; }

.hero-num {
  display: block;
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

/* Clicks-per-day bar chart: thin bars with a 2px gap, rounded data ends
   anchored to the baseline, recessive gridline. */
.chart {
  display: grid;
  grid-template-columns: repeat(30, 1fr);
  gap: 2px;
  align-items: end;
  height: 160px;
  border-bottom: 1px solid var(--grid);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px);
  background-size: 100% 50%;
}

.chart .bar-hit {
  height: 100%;
  display: flex;
  align-items: flex-end;
  cursor: default;
}

.chart .bar {
  width: 100%;
  background: var(--bar);
  border-radius: 4px 4px 0 0;
  min-height: 0;
}

.chart .bar.zero { background: transparent; }

.chart .bar-hit:hover .bar:not(.zero), .chart .bar-hit:focus-visible .bar:not(.zero) { background: var(--bar-hover); }

.chart .bar-hit:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.axis { display: flex; justify-content: space-between; color: var(--text-3); font-size: 0.8rem; margin-top: 6px; }

.table-view { margin-top: 12px; font-size: 0.9rem; }

.table-view summary { cursor: pointer; color: var(--text-2); }

.table-view table { border-collapse: collapse; margin-top: 8px; font-variant-numeric: tabular-nums; }

.table-view th, .table-view td { text-align: left; padding: 2px 16px 2px 0; }

.table-view th { color: var(--text-3); font-weight: 500; }

.referrers { list-style: none; padding: 0; margin: 0; }

.referrers li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  padding: 8px 0;
  border-top: 1px solid var(--grid);
  position: relative;
}

.referrers li:first-child { border-top: none; }

.referrers .host { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.referrers .count { font-variant-numeric: tabular-nums; color: var(--text-2); }

.referrers .meter {
  grid-column: 1 / -1;
  height: 4px;
  border-radius: 4px;
  background: var(--grid);
  overflow: hidden;
}

.referrers .meter > span { display: block; height: 100%; background: var(--bar); border-radius: 4px; }

.tooltip {
  position: fixed;
  pointer-events: none;
  background: var(--text);
  color: var(--surface);
  font-size: 0.8rem;
  padding: 4px 8px;
  border-radius: 6px;
  white-space: nowrap;
  transform: translate(-50%, calc(-100% - 8px));
  z-index: 10;
}

footer { text-align: center; padding: 16px; }

footer a { color: inherit; }

@media (max-width: 560px) {
  .row { grid-template-columns: 1fr; gap: 0; }
  .result { flex-direction: column-reverse; align-items: flex-start; }
  .inline-form { flex-direction: column; align-items: stretch; }
  .stats-head { flex-direction: column; }
  .hero { text-align: left; }
  .chart { height: 120px; gap: 1px; }
}