/* =========================================================
   HomeMath — Design system: "Blueprint"
   A mortgage calculator reads like a spec sheet. Architectural
   blueprints are ink-on-blue or blue-on-white technical drawings —
   so the brief's 3-color rule (black / white / blue) becomes the
   literal palette of a blueprint, not a limitation.

   Tokens
   --ink   : near-black linework, headings, primary text
   --paper : white, page background
   --blue  : the one accent — grid lines, actions, stamped numbers
   ========================================================= */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@600;700;800&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@500;600;700&display=swap');

:root {
  --ink: #0b0d12;
  --ink-soft: #565d6b;
  --paper: #ffffff;
  --blue: #1656d9;
  --blue-dark: #0e3fa8;
  --blue-wash-2: rgba(22, 86, 217, 0.05);
  --blue-wash-6: rgba(22, 86, 217, 0.09);
  --blue-wash-12: rgba(22, 86, 217, 0.14);
  --line: rgba(11, 13, 18, 0.13);

  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "Inter", -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "Consolas", monospace;

  --radius: 3px; /* drafting = square corners, not soft rounded UI */
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    linear-gradient(var(--blue-wash-2) 1px, transparent 1px) 0 0 / 100% 28px,
    linear-gradient(90deg, var(--blue-wash-2) 1px, transparent 1px) 0 0 / 28px 100%,
    var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

h1, h2 { font-family: var(--font-display); letter-spacing: -0.01em; }

.mono { font-family: var(--font-mono); }

.wrap { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* ---------- corner tick marks: draftsman's registration marks ---------- */
.ticked { position: relative; }
.ticked::before, .ticked::after,
.ticked .tick-br, .ticked .tick-bl {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  pointer-events: none;
}
.ticked::before { top: -1px; left: -1px; border-top: 2px solid var(--blue); border-left: 2px solid var(--blue); }
.ticked::after { top: -1px; right: -1px; border-top: 2px solid var(--blue); border-right: 2px solid var(--blue); }
.ticked .tick-bl { bottom: -1px; left: -1px; border-bottom: 2px solid var(--blue); border-left: 2px solid var(--blue); }
.ticked .tick-br { bottom: -1px; right: -1px; border-bottom: 2px solid var(--blue); border-right: 2px solid var(--blue); }

/* ---------- dimension-line divider ---------- */
.dim-line {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 28px 0 18px;
}
.dim-line::before, .dim-line::after { content: ""; flex: 1; height: 1px; background: var(--line); }

/* ---------- header ---------- */
header.site { border-bottom: 2px solid var(--ink); background: var(--paper); position: sticky; top: 0; z-index: 30; }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { font-family: var(--font-display); font-weight: 800; font-size: 20px; color: var(--ink); display: flex; align-items: center; gap: 8px; }
.brand .mark { width: 20px; height: 20px; border: 2px solid var(--ink); position: relative; flex-shrink: 0; }
.brand .mark::before { content: ""; position: absolute; inset: 3px; border: 1.5px solid var(--blue); }
.brand span { color: var(--blue); }

nav.primary { display: flex; gap: 28px; }
nav.primary a {
  color: var(--ink); font-size: 13px; font-weight: 600; font-family: var(--font-mono);
  text-transform: uppercase; letter-spacing: 0.06em; padding-bottom: 4px; border-bottom: 2px solid transparent;
}
nav.primary a:hover { color: var(--blue); text-decoration: none; border-bottom-color: var(--blue); }

/* ---------- footer ---------- */
footer.site { border-top: 2px solid var(--ink); margin-top: 72px; padding: 36px 0; color: var(--ink-soft); font-size: 13px; background: var(--paper); }
footer.site .wrap { display: flex; flex-wrap: wrap; gap: 24px; justify-content: space-between; }
footer.site a { color: var(--ink-soft); }
footer.site a:hover { color: var(--blue); }
footer .cols { display: flex; gap: 48px; flex-wrap: wrap; }
footer .cols h4 { color: var(--ink); font-size: 11px; margin: 0 0 10px; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.08em; }
footer .cols ul { list-style: none; padding: 0; margin: 0; }
footer .cols li { margin-bottom: 7px; }

/* ---------- hero ---------- */
.hero { padding: 56px 0 12px; }
.hero .eyebrow { font-family: var(--font-mono); font-size: 12px; color: var(--blue); text-transform: uppercase; letter-spacing: 0.1em; display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.hero .eyebrow::before { content: "//"; }
.hero h1 { font-size: clamp(32px, 4.4vw, 48px); font-weight: 800; margin: 0 0 14px; }
.hero p.lead { color: var(--ink-soft); font-size: 17px; max-width: 620px; margin: 0 0 8px; }

.house-sketch { margin: 22px 0 8px; opacity: 0.95; }
.house-sketch svg { display: block; }

/* ---------- calculator ---------- */
.calc { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 0; background: var(--paper); border: 2px solid var(--ink); margin: 32px 0 56px; }
@media (max-width: 820px) { .calc { grid-template-columns: 1fr; } }

.calc-inputs { padding: 30px; border-right: 1px solid var(--line); }
@media (max-width: 820px) { .calc-inputs { border-right: none; border-bottom: 1px solid var(--line); } }

.panel-title { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-soft); margin-bottom: 20px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }

.field { margin-bottom: 20px; }
.field label { display: flex; justify-content: space-between; font-size: 12px; font-weight: 700; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink); margin-bottom: 7px; }
.field label .val { color: var(--blue); font-weight: 700; }

.field input[type="text"], .field input[type="number"] {
  width: 100%; padding: 11px 12px; font-size: 15px; font-family: var(--font-mono);
  border: 1.5px solid var(--ink); border-radius: var(--radius); background: var(--paper); color: var(--ink);
}
.field input:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-wash-12); }

.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

.toggle-group { display: inline-flex; border: 1.5px solid var(--ink); border-radius: var(--radius); overflow: hidden; }
.toggle-group button { border: none; background: var(--paper); padding: 8px 15px; font-size: 12px; font-weight: 700; font-family: var(--font-mono); color: var(--ink-soft); cursor: pointer; border-right: 1.5px solid var(--ink); }
.toggle-group button:last-child { border-right: none; }
.toggle-group button.active { background: var(--ink); color: var(--paper); }

.calc-results { padding: 30px; background: var(--blue-wash-2); display: flex; flex-direction: column; }

.result-headline { text-align: center; padding: 4px 0 24px; border-bottom: 1px solid var(--line); margin-bottom: 20px; }
.result-headline .amount { font-family: var(--font-display); font-size: 44px; font-weight: 800; color: var(--ink); letter-spacing: -0.02em; }
.result-headline .label { font-size: 11px; color: var(--ink-soft); font-weight: 700; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.08em; margin-top: 6px; }

.breakdown-row { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; border-bottom: 1px dashed var(--line); font-size: 14px; font-family: var(--font-mono); }
.breakdown-row:last-child { border-bottom: none; font-weight: 700; padding-top: 14px; border-top: 1.5px solid var(--ink); margin-top: 4px; }
.breakdown-row .dot { display:inline-block; width:8px; height:8px; margin-right:8px; background: var(--ink-soft); }
.breakdown-row.pi .dot { background: var(--blue); }

.bar { display: flex; height: 8px; overflow: hidden; margin: 18px 0 4px; background: var(--line); }
.bar span { display: block; height: 100%; }
.bar .pi { background: var(--blue); }
.bar .tax { background: var(--ink); }
.bar .ins { background: var(--ink-soft); }
.bar .hoa { background: #9db6ec; }

.btn { display: inline-block; background: var(--ink); color: #fff; font-weight: 700; font-size: 13px; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.05em; border: 1.5px solid var(--ink); border-radius: var(--radius); padding: 13px 22px; cursor: pointer; text-align: center; }
.btn:hover { background: var(--blue); border-color: var(--blue); text-decoration: none; }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: #fff; }

/* ---------- content sections ---------- */
.section { padding: 44px 0; }
.section h2 { font-size: 26px; font-weight: 800; margin-bottom: 10px; }
.section h3 { font-family: var(--font-display); font-size: 19px; font-weight: 700; margin: 30px 0 10px; }
.section p { color: var(--ink-soft); }
.article-body p { color: var(--ink); font-size: 16.5px; }
.article-body ul { color: var(--ink); }

.takeaways { border: 1.5px solid var(--ink); border-left: 5px solid var(--blue); padding: 18px 20px; margin: 20px 0 30px; background: var(--blue-wash-2); }
.takeaways .panel-title { border-bottom: none; margin-bottom: 10px; }
.takeaways ul { margin: 0; padding-left: 18px; }
.takeaways li { margin-bottom: 6px; font-size: 14.5px; }

.faq-item { border-bottom: 1px solid var(--line); padding: 16px 0; }
.faq-item h4 { font-family: var(--font-display); font-size: 15.5px; margin: 0 0 6px; }
.faq-item p { margin: 0; font-size: 14.5px; }

.byline { display: flex; align-items: center; gap: 10px; font-family: var(--font-mono); font-size: 12px; color: var(--ink-soft); margin: 8px 0 24px; }
.byline .stamp { border: 1px solid var(--ink-soft); padding: 2px 7px; font-size: 10px; text-transform: uppercase; letter-spacing: 0.06em; }

/* ---------- article index / ledger (replaces card-grid) ---------- */
.ledger { display: grid; grid-template-columns: 220px 1fr; gap: 0; border: 2px solid var(--ink); margin: 24px 0; }
@media (max-width: 760px) { .ledger { grid-template-columns: 1fr; } }

.ledger-nav { border-right: 1px solid var(--line); max-height: 640px; overflow-y: auto; background: var(--blue-wash-2); }
.ledger-nav a { display: block; padding: 10px 16px; font-family: var(--font-mono); font-size: 12.5px; color: var(--ink); border-bottom: 1px solid var(--line); }
.ledger-nav a:hover { background: var(--blue-wash-12); text-decoration: none; color: var(--blue); }

.ledger-main { padding: 0; }
.ledger-group-title { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--paper); background: var(--ink); padding: 10px 20px; position: sticky; top: 0; }
.ledger-row { display: grid; grid-template-columns: 90px 1fr 24px; align-items: center; gap: 14px; padding: 13px 20px; border-bottom: 1px solid var(--line); }
.ledger-row:hover { background: var(--blue-wash-2); }
.ledger-row .tag { font-family: var(--font-mono); font-size: 10.5px; font-weight: 700; color: var(--blue); text-transform: uppercase; letter-spacing: 0.04em; }
.ledger-row .ttl { font-size: 14.5px; color: var(--ink); }
.ledger-row .ttl:hover { color: var(--blue); }
.ledger-row .arrow { color: var(--ink-soft); font-family: var(--font-mono); }

/* ad slots */
.ad-slot { border: 1px dashed var(--line); background: var(--blue-wash-2); color: var(--ink-soft); font-size: 11px; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.05em; text-align: center; padding: 10px; margin: 28px 0; }

.disclosure { font-size: 12.5px; color: var(--ink-soft); background: var(--blue-wash-2); border: 1px solid var(--line); border-left: 3px solid var(--blue); padding: 12px 16px; margin-bottom: 24px; }

.breadcrumb { font-family: var(--font-mono); font-size: 12px; color: var(--ink-soft); margin-bottom: 18px; text-transform: uppercase; letter-spacing: 0.04em; }
.breadcrumb a { color: var(--ink-soft); }
.breadcrumb a:hover { color: var(--blue); }

.badge { display: inline-block; font-size: 11px; font-weight: 700; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.05em; color: var(--blue); border: 1px solid var(--blue); padding: 3px 9px; margin-bottom: 14px; }

.related { border-top: 2px solid var(--ink); margin-top: 44px; padding-top: 24px; }
.related ul { columns: 2; padding-left: 0; list-style: none; }
.related li { font-family: var(--font-mono); font-size: 13.5px; padding: 6px 0; border-bottom: 1px dashed var(--line); }
@media (max-width: 640px) { .related ul { columns: 1; } }

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

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }