:root {
  --bg: #f7f7f4;
  --card: #ffffff;
  --text: #1d1d1b;
  --muted: #5d5d58;
  --accent: #1f5f8b;
  --accent-soft: #e4eef6;
  --good: #2e7d4f;
  --warn: #8a5a00;
  --border: #d9d9d2;
  --on-accent: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161614;
    --card: #22221f;
    --text: #efefea;
    --muted: #b5b5ad;
    --accent: #7db7e0;
    --accent-soft: #223443;
    --good: #7fd19b;
    --warn: #e7c17a;
    --border: #3a3a35;
    --on-accent: #0d1a24;
  }
}
:root[data-theme="dark"] {
  --bg: #161614;
  --card: #22221f;
  --text: #efefea;
  --muted: #b5b5ad;
  --accent: #7db7e0;
  --accent-soft: #223443;
  --good: #7fd19b;
  --warn: #e7c17a;
  --border: #3a3a35;
  --on-accent: #0d1a24;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Arial", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  padding: 0 16px;
  overflow-x: hidden;
}
header, main, footer { max-width: 760px; margin: 0 auto; }
header { padding: 16px 0 8px; }
header nav a { margin-left: 12px; color: var(--accent); text-decoration: none; font-size: 15px; }
h1 { font-size: 26px; margin: 12px 0 8px; line-height: 1.3; }
h2 { font-size: 20px; margin: 24px 0 8px; }
p { margin: 8px 0; }
a { color: var(--accent); }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin: 12px 0;
}
.controls { display: grid; gap: 12px; }
@media (min-width: 560px) { .controls { grid-template-columns: 1fr 1fr; } }
label { display: block; font-weight: 600; margin-bottom: 4px; }
select, input[type="number"] {
  width: 100%;
  font: inherit;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
}
fieldset { border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; margin: 0; }
fieldset label { font-weight: 400; display: inline-block; margin-left: 12px; }
button {
  font: inherit;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--on-accent);
  cursor: pointer;
}
button.secondary { background: transparent; color: var(--accent); }
.bridge-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; align-items: baseline; }
.bridge-title { font-weight: 700; font-size: 18px; }
.ratio { font-weight: 700; color: var(--good); }
.stats { display: flex; flex-wrap: wrap; gap: 8px 16px; margin: 8px 0; font-size: 15px; }
.stats span { background: var(--accent-soft); border-radius: 999px; padding: 2px 10px; }
.days-list { margin: 6px 0 0; padding-inline-start: 20px; font-size: 15px; }
.holiday-names { color: var(--muted); font-size: 14px; margin: 4px 0 0; }
.note { color: var(--muted); font-size: 14px; }
.warn { color: var(--warn); }
.empty { color: var(--muted); }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: right; padding: 8px 6px; border-bottom: 1px solid var(--border); vertical-align: top; }
.badge-ok { color: var(--good); font-weight: 600; }
.badge-no { color: var(--warn); font-weight: 600; }
footer { padding: 24px 0 32px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--border); margin-top: 24px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.variants { margin-top: 8px; font-size: 14px; }
.variants summary { cursor: pointer; color: var(--accent); }