:root { --ink:#16202e; --ink-2:#3b4757; --muted:#6b7684; --line:#e6e9ee; --brand:#2457d6; --brand-soft:#e8eefc; --ok:#067647; --ok-bg:#e7f6ee; --due:#b54708; --due-bg:#fff4e5; --overdue:#b42318; --overdue-bg:#fdecea; }
* { box-sizing: border-box; }
body { margin: 0; font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; color: var(--ink); background: #fff; line-height: 1.55; font-size: 16px; -webkit-font-smoothing: antialiased; }
a { color: var(--brand); text-decoration: none; } a:hover { text-decoration: underline; }
.head { border-bottom: 1px solid var(--line); }
.head .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 750; font-size: 17px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.mark { width: 28px; height: 28px; border-radius: 7px; background: var(--brand); display: grid; place-items: center; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
main.wrap { padding: 40px 20px 60px; }
h1 { font-size: 34px; line-height: 1.15; letter-spacing: -.01em; margin: 0 0 10px; }
h2 { font-size: 22px; margin: 32px 0 10px; letter-spacing: -.01em; }
p, li { color: var(--ink-2); }
.lead { font-size: 18px; margin-bottom: 24px; }
.muted { color: var(--muted); } .small { font-size: 14px; }
.btn { display: inline-flex; align-items: center; justify-content: center; height: 44px; padding: 0 18px; border-radius: 8px; font-weight: 600; border: 1px solid #d5dae2; background: #fff; color: var(--ink); cursor: pointer; font: inherit; font-weight: 600; }
.btn.primary { background: var(--brand); color: #fff; border-color: var(--brand); } .btn:hover { text-decoration: none; }
.calc { background: #f6f7f9; border: 1px solid var(--line); border-radius: 12px; padding: 20px; margin: 20px 0; }
.calc label { display: block; font-weight: 600; margin-bottom: 6px; }
.calc .row { display: flex; gap: 8px; }
.calc input { flex: 1; height: 46px; padding: 0 14px; font-size: 18px; border: 1px solid #d5dae2; border-radius: 8px; font-family: ui-monospace, Menlo, monospace; }
.calc input:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }
.result { margin-top: 16px; padding: 16px; border-radius: 10px; display: none; }
.result.show { display: block; }
.result.ok { background: var(--ok-bg); color: var(--ok); }
.result.soon { background: var(--due-bg); color: var(--due); }
.result.bad { background: var(--overdue-bg); color: var(--overdue); }
.result b { font-size: 20px; display: block; margin-bottom: 4px; }
.result p { color: inherit; margin: 4px 0 0; }
.cta { background: var(--brand-soft); border-radius: 12px; padding: 22px; margin-top: 36px; }
.cta h2 { margin-top: 0; }
table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 15px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.foot { border-top: 1px solid var(--line); padding: 24px 20px 48px; font-size: 14px; color: var(--muted); }
.legal h2 { font-size: 18px; }
.legal p { margin: 0 0 12px; }
.guides { font-size: 14px; color: var(--muted); margin: 8px 0 24px; line-height: 1.8; }
.checklist { list-style: none; padding: 0; margin: 0 0 8px; }
.checklist li { padding: 10px 0 10px 32px; border-bottom: 1px solid var(--line); position: relative; }
.checklist li::before { content: ""; position: absolute; left: 0; top: 13px; width: 18px; height: 18px; border: 2px solid #cbd5e1; border-radius: 5px; }
.checklist b { color: var(--ink); }
.cite { font-size: 12px; color: var(--muted); background: #f6f7f9; border: 1px solid var(--line); border-radius: 5px; padding: 1px 6px; margin-left: 6px; white-space: nowrap; }
.warn { background: var(--overdue-bg); color: var(--overdue); border-radius: 10px; padding: 14px 16px; margin: 16px 0; }
.warn b { color: inherit; }
.tip { background: var(--ok-bg); color: var(--ok); border-radius: 10px; padding: 14px 16px; margin: 16px 0; }
.toc { background: #f6f7f9; border-radius: 10px; padding: 12px 16px; margin: 16px 0 24px; font-size: 15px; }
.toc a { display: block; padding: 3px 0; }
.fsc .grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 16px; }
.fsc .f.wide { grid-column: 1 / -1; }
.fsc input, .fsc select { width: 100%; height: 46px; padding: 0 12px; font-size: 17px; border: 1px solid #d5dae2; border-radius: 8px; background: #fff; color: var(--ink); font-family: inherit; }
.fsc input { font-family: ui-monospace, Menlo, monospace; }
.fsc input:focus, .fsc select:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }
.fsc .hint { font-size: 13px; color: var(--muted); margin-top: 5px; line-height: 1.4; }
.fsc .result p.gap { font-weight: 600; margin-top: 10px; }
.result b.inline { display: inline; font-size: inherit; margin: 0; }
.formula { background: #f6f7f9; border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; font-family: ui-monospace, Menlo, monospace; font-size: 15px; color: var(--ink); }
.linkbtn { background: none; border: 0; padding: 0; color: var(--brand); font: inherit; cursor: pointer; }
.linkbtn:hover { text-decoration: underline; }
tr.cur td { background: var(--brand-soft); font-weight: 600; color: var(--ink); }
@media (max-width: 560px) { .fsc .grid { grid-template-columns: 1fr; } h1 { font-size: 28px; } }
@media print {
  .head, .guides, .calc, .cta, .foot, main > h2, main > p, .formula, #sched p:first-of-type { display: none !important; }
  #sched, #sched h2 { display: block !important; margin-top: 0; }
  main.wrap { padding: 0; }
  tr.cur td { background: none; }
}