:root {
  --bg: #faf8f4;
  --surface: #ffffff;
  --text: #1d2424;
  --muted: #6b7472;
  --border: #e4e0d8;
  --accent: #1f6f5c;
  --accent-text: #ffffff;
  --soon: #b7791f;
  --danger: #b4372f;
  --irs: #2f5fa7;
  --iva: #8a4fb0;
  --ss: #1f6f5c;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141817;
    --surface: #1c2120;
    --text: #e7ebe9;
    --muted: #97a19e;
    --border: #2d3432;
    --accent: #4fb89a;
    --accent-text: #0d1312;
    --soon: #e2a33b;
    --danger: #e8776e;
    --irs: #7ea6e6;
    --iva: #c39ae0;
    --ss: #4fb89a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--accent); }
h1 { font-size: 1.9rem; line-height: 1.2; margin: 0 0 .5rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 .75rem; }
code { font-size: .9em; background: var(--border); padding: .1em .35em; border-radius: 4px; }
.muted, .muted a { color: var(--muted); }
.lead { font-size: 1.1rem; color: var(--muted); max-width: 42rem; }
.danger { color: var(--danger); }

header.site, main, footer.site { max-width: 52rem; margin: 0 auto; padding: 0 16px; }
header.site { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; align-items: center; justify-content: space-between; padding-top: 1rem; padding-bottom: 1rem; }
header.site nav { display: flex; flex-wrap: wrap; gap: .25rem 1rem; align-items: center; }
header.site nav a { color: var(--text); text-decoration: none; }
header.site nav a:hover { color: var(--accent); }
.brand { font-weight: 700; font-size: 1.3rem; color: var(--accent) !important; text-decoration: none; }
main { padding-bottom: 3rem; }
footer.site { border-top: 1px solid var(--border); color: var(--muted); font-size: .9rem; padding-top: 1rem; padding-bottom: 2rem; }

.hero { padding: 2rem 0 1rem; }
.hero h1 { font-size: 2.3rem; max-width: 36rem; }

.button, button.button {
  display: inline-block; background: var(--accent); color: var(--accent-text);
  border: 0; border-radius: 8px; padding: .6rem 1rem; font: inherit; font-weight: 600;
  text-decoration: none; cursor: pointer; margin: 0 .4rem .4rem 0;
}
.button.secondary { background: transparent; color: var(--accent); box-shadow: inset 0 0 0 1.5px var(--accent); }
button.link { background: none; border: 0; padding: 0; font: inherit; color: var(--muted); cursor: pointer; }
form.inline { display: inline; }

.flash { background: var(--surface); border-left: 4px solid var(--accent); padding: .5rem .75rem; }
.error { color: var(--danger); }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 1.25rem; margin: 1.5rem 0; }
.card h2:first-child { margin-top: 0; }
.narrow { max-width: 28rem; }
label { display: block; margin: .9rem 0; }
label input:not([type=checkbox]):not([type=radio]) {
  display: block; width: 100%; margin-top: .3rem; padding: .5rem .6rem; font: inherit;
  color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
}
.check-row { display: flex; gap: .5rem; align-items: baseline; margin: .5rem 0; }
.hint { color: var(--muted); font-size: .88rem; margin: -.3rem 0 .8rem 1.6rem; }
fieldset { border: 1px solid var(--border); border-radius: 8px; margin: 1rem 0; }
code.copy { display: block; overflow-wrap: anywhere; padding: .5rem; user-select: all; }

.pager { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.month-heading { border-bottom: 1px solid var(--border); padding-bottom: .3rem; }

.deadlines { list-style: none; padding: 0; margin: 0; }
.deadline {
  display: grid; grid-template-columns: 3rem 1fr auto auto; gap: .9rem; align-items: start;
  background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--border);
  border-radius: 10px; padding: .8rem; margin-bottom: .6rem;
}
.deadline.soon { border-left-color: var(--soon); }
.deadline.overdue { border-left-color: var(--danger); }
.deadline.done { opacity: .55; }
.deadline.done .title a { text-decoration: line-through; }
.date { text-align: center; line-height: 1.1; }
.date .day { display: block; font-size: 1.4rem; font-weight: 700; }
.date .month { font-size: .8rem; text-transform: uppercase; color: var(--muted); }
.title a { color: var(--text); font-weight: 600; text-decoration: none; }
.title a:hover { color: var(--accent); }
.period { color: var(--muted); font-size: .88rem; white-space: nowrap; }
.summary { color: var(--muted); font-size: .93rem; }
a.howto { white-space: nowrap; font-weight: 600; text-decoration: none; }
.condition { font-size: .85rem; font-style: italic; color: var(--muted); margin-top: .2rem; }
.when { font-size: .85rem; color: var(--muted); white-space: nowrap; }
.overdue .when { color: var(--danger); font-weight: 600; }
.soon .when { color: var(--soon); font-weight: 600; }
button.check {
  width: 1.8rem; height: 1.8rem; border-radius: 50%; border: 2px solid var(--border);
  background: var(--bg); color: var(--accent); font-weight: 700; cursor: pointer;
}
button.check:hover { border-color: var(--accent); }
.empty { color: var(--muted); list-style: none; }

.tag { font-size: .68rem; font-weight: 700; letter-spacing: .04em; padding: .1rem .35rem; border-radius: 4px; color: var(--surface); vertical-align: 2px; }
.tag-irs { background: var(--irs); }
.tag-iva { background: var(--iva); }
.tag-ss { background: var(--ss); }
.tag-me { background: var(--muted); }
form.toggle { display: flex; gap: .5rem; align-items: center; }
input.amount { width: 7.5rem; padding: .3rem .45rem; font: inherit; font-size: .88rem; color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 6px; }
span.amount { font-size: .85rem; color: var(--muted); white-space: nowrap; }
table.totals { width: 100%; border-collapse: collapse; }
table.totals th, table.totals td { text-align: left; padding: .35rem 0; border-bottom: 1px solid var(--border); font-weight: 400; }
table.totals td { color: var(--muted); padding-left: 1rem; }
table.totals td.num { text-align: right; color: var(--text); font-variant-numeric: tabular-nums; }
.badge { font-size: .72rem; border: 1px solid var(--border); border-radius: 999px; padding: .05rem .5rem; color: var(--muted); font-weight: 400; vertical-align: 2px; }

.cards { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: .75rem; }
.cards a { display: block; height: 100%; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 1rem; color: var(--text); text-decoration: none; }
.cards a:hover { border-color: var(--accent); }
.cards span:not(.badge) { display: block; color: var(--muted); font-size: .92rem; margin-top: .3rem; }

.guide .video { display: block; width: 100%; aspect-ratio: 16 / 9; margin: 1.25rem 0; border-radius: 10px; overflow: hidden; background: #000; }
.guide .video iframe { width: 100%; height: 100%; border: 0; }
.prose { max-width: 42rem; }
.prose img { max-width: 100%; }

@media (max-width: 560px) {
  .deadline { grid-template-columns: 2.6rem 1fr auto; }
  .deadline .when { grid-column: 2; }
  .hero h1 { font-size: 1.8rem; }
}