/* Form2210Calc — mobile-first, single column, system fonts, no framework. */

:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --ink: #182230;
  --muted: #5d6b7a;
  --faint: #67707a;
  --accent: #1e4fd8;
  --accent-dark: #173fb0;
  --accent-soft: #eef3fe;
  --ok: #137a44;
  --ok-bg: #e9f9f0;
  --ok-border: #b5e6cc;
  --warn: #92600a;
  --warn-bg: #fdf6e3;
  --warn-border: #f0dca4;
  --bad: #b42330;
  --bad-bg: #fdeef0;
  --bad-border: #f3c2c8;
  --border: #dfe5ec;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(24, 34, 48, 0.05), 0 4px 16px rgba(24, 34, 48, 0.06);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
}

.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }

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

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- header ---------- */

.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  padding-top: 12px;
  padding-bottom: 12px;
}
.brand {
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.brand svg { flex: 0 0 auto; }
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  font-size: 0.9rem;
}
.site-nav a { text-decoration: none; color: var(--muted); }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--accent); }

/* ---------- banners ---------- */

.banner {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  color: var(--warn);
  border-radius: var(--radius);
  padding: 10px 14px;
  margin: 16px 0 0;
  font-size: 0.92rem;
}

/* ---------- hero ---------- */

.hero { padding: 28px 0 8px; }
.hero h1 {
  font-size: 1.65rem;
  line-height: 1.25;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.lede { color: var(--muted); margin: 0; max-width: 60ch; }

/* ---------- cards ---------- */

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin: 20px 0;
}
.card h2 { font-size: 1.15rem; margin: 0 0 14px; }

/* ---------- form ---------- */

fieldset { border: 0; margin: 0 0 6px; padding: 0; min-width: 0; }
legend, .label {
  display: block;
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 6px;
}
.hint { font-size: 0.83rem; color: var(--faint); margin: 4px 0 0; }

.field { margin-bottom: 16px; }

input[type="text"], input[type="date"], select {
  width: 100%;
  font: inherit;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  min-height: 44px;
}
input[type="text"]:focus, input[type="date"]:focus, select:focus {
  border-color: var(--accent);
  outline: 2px solid var(--accent-soft);
}
.money { position: relative; }
.money input { padding-left: 26px; font-variant-numeric: tabular-nums; }
.money::before {
  content: "$";
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--faint);
  pointer-events: none;
}

.grid2 { display: grid; grid-template-columns: 1fr; gap: 0 16px; }
@media (min-width: 560px) { .grid2 { grid-template-columns: 1fr 1fr; } }

.check {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 0.95rem;
  margin: 4px 0 16px;
}
.check input { width: 18px; height: 18px; margin-top: 3px; flex: 0 0 auto; }

/* segmented year toggle */
.seg {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 4px;
}
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label {
  text-align: center;
  padding: 8px 6px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--muted);
  border: 1px solid transparent;
}
.seg input:checked + label {
  background: var(--card);
  color: var(--accent);
  border-color: var(--border);
  box-shadow: var(--shadow);
}
.seg input:focus-visible + label { outline: 3px solid var(--accent); outline-offset: 1px; }
.seg .seg-sub { display: block; font-weight: 400; font-size: 0.78rem; color: var(--faint); }

/* quarterly payment rows */
.qrow {
  display: grid;
  grid-template-columns: 44px 1fr 1fr;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}
.qrow .qlabel { font-weight: 600; font-size: 0.9rem; color: var(--muted); }
@media (max-width: 420px) {
  .qrow { grid-template-columns: 36px 1fr 1fr; gap: 6px; }
}

/* ---------- results ---------- */

.results { scroll-margin-top: 20px; }

.verdict {
  display: inline-block;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: 999px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--muted);
  margin-bottom: 10px;
}
.verdict.ok { background: var(--ok-bg); color: var(--ok); border-color: var(--ok-border); }
.verdict.bad { background: var(--bad-bg); color: var(--bad); border-color: var(--bad-border); }
.verdict.warn { background: var(--warn-bg); color: var(--warn); border-color: var(--warn-border); }

.penalty-figure {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 2px 0 4px;
  font-variant-numeric: tabular-nums;
}
.penalty-figure.zero { color: var(--ok); }
.penalty-figure.owed { color: var(--bad); }
.figure-sub { color: var(--muted); font-size: 0.92rem; margin: 0 0 14px; }

.meter-line {
  background: var(--accent-soft);
  border: 1px solid #c9d8f8;
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.97rem;
  margin: 14px 0;
}
.meter-line strong { font-variant-numeric: tabular-nums; }

.rap-line { font-size: 0.9rem; color: var(--muted); margin: 10px 0 0; }

/* breakdown table */
.table-scroll { overflow-x: auto; margin: 14px 0 4px; }
table.breakdown {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  min-width: 540px;
}
table.breakdown th, table.breakdown td {
  text-align: right;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
table.breakdown th:first-child, table.breakdown td:first-child { text-align: left; }
table.breakdown thead th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--faint);
  border-bottom: 2px solid var(--border);
}
table.breakdown tfoot td { font-weight: 700; border-bottom: 0; }
table.breakdown .late { color: var(--bad); }
table.breakdown .fine { color: var(--ok); }

/* content tables (due-dates page etc.) */
table.plain {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  margin: 12px 0;
}
table.plain th, table.plain td {
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--border);
}
table.plain thead th {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--faint);
}

/* ---------- result meta chips ---------- */

.result-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin: 10px 0 4px;
  font-size: 0.83rem;
  color: var(--muted);
}
.rate-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--accent-soft);
  border: 1px solid #c9d8f8;
  color: var(--accent);
  font-weight: 600;
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 0.8rem;
}
.due-dates-link {
  font-size: 0.83rem;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px dashed var(--border);
}
.due-dates-link:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ---------- CTA / affiliate box ---------- */

.cta-box {
  border: 1px solid #c9d8f8;
  background: linear-gradient(180deg, #f6f9ff, #eef3fe);
  border-radius: var(--radius);
  padding: 18px;
  margin: 20px 0;
}
.cta-box h2 { margin: 0 0 6px; font-size: 1.1rem; }
.cta-box > p { margin: 0 0 14px; color: var(--muted); font-size: 0.95rem; }
.cta-options { display: grid; grid-template-columns: 1fr; gap: 10px; }
@media (min-width: 560px) { .cta-options { grid-template-columns: 1fr 1fr; } }
.cta-option {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  text-decoration: none;
  color: var(--ink);
}
.cta-option:hover { border-color: var(--accent); }
.cta-option .cta-name { font-weight: 700; display: block; }
.cta-option .cta-desc { font-size: 0.87rem; color: var(--muted); display: block; margin-top: 3px; }
.cta-option .cta-go { display: inline-block; margin-top: 8px; font-weight: 600; color: var(--accent); font-size: 0.9rem; }
.cta-disclosure { font-size: 0.78rem; color: var(--faint); margin: 12px 0 0; }
.cta-neutrality { font-size: 0.8rem; color: var(--muted); background: var(--warn-bg); border: 1px solid var(--warn-border); border-radius: 8px; padding: 7px 12px; margin: 0 0 14px; }

/* ---------- disclaimer ---------- */

.disclaimer {
  border: 1px solid var(--border);
  border-left: 4px solid var(--warn);
  background: var(--card);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 0.88rem;
  color: var(--muted);
  margin: 20px 0;
}

/* ---------- FAQ ---------- */

.faq details {
  border-bottom: 1px solid var(--border);
  padding: 4px 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  padding: 10px 0;
  list-style-position: outside;
}
.faq details > p { margin: 0 0 14px; color: var(--muted); }

/* ---------- prose (content pages) ---------- */

.prose h2 { font-size: 1.3rem; margin: 28px 0 10px; }
.prose h3 { font-size: 1.05rem; margin: 22px 0 8px; }
.prose p, .prose li { color: #2c3a4a; }
.prose .example {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 16px 0;
}
.prose code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--accent-soft);
  border-radius: 4px;
  padding: 1px 5px;
}
.callout {
  background: var(--accent-soft);
  border: 1px solid #c9d8f8;
  border-radius: 10px;
  padding: 12px 16px;
  margin: 16px 0;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  border-radius: 9px;
  padding: 11px 20px;
  border: 0;
  font-size: 1rem;
  cursor: pointer;
}
.btn:hover { background: var(--accent-dark); color: #fff; }

/* ---------- footer ---------- */

.site-footer {
  margin-top: 36px;
  border-top: 1px solid var(--border);
  background: var(--card);
  font-size: 0.85rem;
  color: var(--muted);
}
.site-footer .wrap { padding-top: 22px; padding-bottom: 28px; }
.site-footer h2 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--faint); margin: 18px 0 6px; }
.site-footer ul { margin: 0; padding-left: 18px; }
.site-footer li { margin: 3px 0; }
.foot-note { margin-top: 16px; color: var(--faint); }
.rates-stamp { font-weight: 600; color: var(--muted); }

/* ---------- 404 ---------- */

.notfound { text-align: center; padding: 70px 0; }
.notfound h1 { font-size: 2rem; }

@media print {
  .site-header, .site-footer, .cta-box, .banner, form { display: none; }
}