/* ─────────────────────────────────────────────────────────
   Amortization Schedule — calculator stylesheet
   grounded, financial-editorial. Fraunces (display serif) +
   Inter (UI) + JetBrains Mono (numerics).
   ───────────────────────────────────────────────────────── */

:root {
  /* color */
  --ink-900: #0f1d2e;       /* deep navy — text, masthead */
  --ink-700: #2c3a4f;
  --ink-500: #56657a;       /* secondary text */
  --ink-300: #97a2b3;       /* muted / meta */
  --ink-100: #d9dee6;       /* hairlines */
  --paper:   #fbfaf6;       /* page background — warm off-white, not cream-cliché */
  --paper-2: #f4f1ea;       /* panel alt background */
  --accent:  #b6442b;       /* burnt sienna — single warm accent for emphasis */
  --accent-2:#7e2c19;       /* darker accent for hover */
  --positive:#1f6f4a;       /* very rare, for "crossover" notes */
  --shadow:  rgba(15, 29, 46, 0.06);

  /* type */
  --f-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --f-ui:      "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --f-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* spacing — tight, intentional */
  --gap-1: 6px;
  --gap-2: 10px;
  --gap-3: 14px;
  --gap-4: 20px;
  --gap-5: 32px;
  --gap-6: 56px;
  --gap-7: 88px;

  --radius-sm: 4px;
  --radius-md: 8px;

  --rule: 1px solid var(--ink-100);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-900);
  font-family: var(--f-ui);
  font-size: 15px;
  line-height: 1.55;
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ───────── masthead ───────── */
.masthead {
  border-bottom: var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(6px);
}
.masthead-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  gap: var(--gap-4);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}
.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--ink-900);
  color: var(--paper);
  display: grid;
  place-items: center;
  position: relative;
  flex-shrink: 0;
}
.brand-mark .mark-cap {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: linear-gradient(135deg, #1c2c44 0%, #0f1d2e 100%);
  z-index: 0;
}
.brand-mark .mark-pct {
  position: relative;
  z-index: 1;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 22px;
  line-height: 1;
}
.brand-word {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-title {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.brand-sub {
  font-size: 11.5px;
  color: var(--ink-500);
  letter-spacing: 0.02em;
  margin-top: 2px;
}
.nav-links {
  display: flex;
  gap: 22px;
  font-size: 14px;
}
.nav-links a {
  color: var(--ink-700);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: border-color 120ms ease, color 120ms ease;
}
.nav-links a:hover { border-bottom-color: var(--ink-900); color: var(--ink-900); }

/* ───────── hero ───────── */
.hero { padding: 64px 0 36px; }
.eyebrow {
  font-family: var(--f-ui);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 var(--gap-3);
}
.display {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 var(--gap-4);
  max-width: 18ch;
  color: var(--ink-900);
}
.display em {
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
}
.lede {
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-700);
  max-width: 56ch;
  margin: 0;
}

/* ───────── calc ───────── */
.calc { padding: 36px 0 56px; }
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-4);
}

.panel {
  background: #fff;
  border: var(--rule);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: 0 1px 0 var(--shadow);
}
.panel-title {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: -0.01em;
  margin: 0 0 var(--gap-4);
  padding-bottom: 12px;
  border-bottom: var(--rule);
}

/* form fields */
.field { margin-bottom: var(--gap-4); }
.field label, .label-like {
  display: block;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink-700);
  margin-bottom: 6px;
  letter-spacing: 0.01em;
}
.optional {
  color: var(--ink-300);
  font-weight: 400;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-left: 4px;
}

.input-prefix, .input-suffix {
  position: relative;
  display: flex;
  align-items: center;
}
.input-prefix .prefix,
.input-suffix .suffix {
  position: absolute;
  color: var(--ink-500);
  font-family: var(--f-mono);
  font-size: 14px;
  pointer-events: none;
}
.input-prefix .prefix { left: 14px; }
.input-suffix .suffix { right: 14px; }

input[type="number"], select {
  width: 100%;
  font-family: var(--f-mono);
  font-size: 14.5px;
  color: var(--ink-900);
  background: var(--paper);
  border: 1px solid var(--ink-100);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  transition: border-color 120ms ease, background 120ms ease;
  appearance: none;
  -moz-appearance: textfield;
}
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.input-prefix input { padding-left: 28px; }
.input-suffix input { padding-right: 78px; }

input[type="number"]:focus,
select:focus {
  outline: none;
  border-color: var(--ink-900);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(15, 29, 46, 0.08);
}

.select-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.select-wrap select {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3e%3cpath fill='%2356657a' d='M0 0l5 6 5-6z'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 30px;
}

.radio-row {
  display: inline-flex;
  background: var(--paper-2);
  border-radius: var(--radius-sm);
  padding: 3px;
  border: 1px solid var(--ink-100);
}
.radio {
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
}
.radio input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.radio span {
  display: inline-block;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 3px;
  color: var(--ink-500);
  transition: background 120ms ease, color 120ms ease;
}
.radio input:checked + span {
  background: var(--ink-900);
  color: var(--paper);
}

/* actions */
.actions {
  display: flex;
  gap: 10px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: var(--rule);
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  font-family: var(--f-ui);
  font-size: 13.5px;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease, transform 80ms ease;
  text-decoration: none;
  letter-spacing: 0.01em;
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.btn-primary {
  background: var(--ink-900);
  color: var(--paper);
}
.btn-primary:hover { background: #1c2c44; }
.btn-ghost {
  background: transparent;
  color: var(--ink-700);
  border: 1px solid var(--ink-100);
}
.btn-ghost:hover { border-color: var(--ink-500); color: var(--ink-900); }

/* summary */
.summary {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0 0 var(--gap-4);
}
.summary > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 11px 0;
  border-bottom: 1px dashed var(--ink-100);
  gap: var(--gap-3);
}
.summary > div:last-child { border-bottom: none; }
.summary dt {
  font-size: 13.5px;
  color: var(--ink-500);
  font-weight: 400;
}
.summary dd {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-900);
  font-variant-numeric: tabular-nums;
}
.summary .accent dt { color: var(--accent); }
.summary .accent dd {
  color: var(--accent);
  font-weight: 600;
}
.summary .accent {
  border-top: 1px solid var(--ink-100);
  margin-top: 4px;
  padding-top: 14px !important;
}

.export-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding-top: 18px;
  border-top: var(--rule);
}
.btn-export {
  background: var(--paper-2);
  color: var(--ink-700);
  border: 1px solid var(--ink-100);
  padding: 9px 10px;
  font-size: 12.5px;
}
.btn-export:hover:not(:disabled) {
  background: var(--ink-900);
  color: var(--paper);
  border-color: var(--ink-900);
}
.btn-export:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* ───────── schedule ───────── */
.schedule { padding: 56px 0; background: var(--paper-2); border-top: var(--rule); border-bottom: var(--rule); }
.schedule-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: var(--gap-3); margin-bottom: var(--gap-4); }
.schedule-sub { margin: 0; font-size: 14px; color: var(--ink-500); }

.table-wrap {
  background: #fff;
  border: var(--rule);
  border-radius: var(--radius-md);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}
.schedule-table th {
  text-align: left;
  font-family: var(--f-ui);
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-500);
  background: var(--paper-2);
  padding: 11px 16px;
  border-bottom: 1px solid var(--ink-100);
  position: sticky;
  top: 0;
  white-space: nowrap;
}
.schedule-table th.num,
.schedule-table td.num { text-align: right; font-variant-numeric: tabular-nums; font-family: var(--f-mono); }
.schedule-table td {
  padding: 9px 16px;
  border-bottom: 1px solid var(--ink-100);
  color: var(--ink-900);
  font-family: var(--f-mono);
  font-size: 13.5px;
  white-space: nowrap;
}
.schedule-table td:first-child {
  font-family: var(--f-ui);
  font-size: 13.5px;
  white-space: nowrap;
}
.schedule-table tbody tr:nth-child(even) td { background: rgba(244, 241, 234, 0.45); }
.schedule-table tbody tr:hover td { background: rgba(182, 68, 43, 0.05); }
.schedule-table tbody tr.year-divider td {
  background: var(--ink-900);
  color: var(--paper);
  font-weight: 500;
  text-align: left;
  padding: 8px 16px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: var(--f-ui);
  cursor: pointer;
  user-select: none;
  position: sticky;
  top: 38px; /* sits just below the sticky table headers */
  z-index: 2;
  transition: background 120ms ease;
}
.schedule-table tbody tr.year-divider:hover td { background: #1c2c44; }
.schedule-table tbody tr.year-divider:focus-visible td {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}
.schedule-table tbody tr.year-divider td.num { text-align: left; font-family: var(--f-ui); }
.schedule-table tbody tr.year-divider .year-chevron {
  display: inline-block;
  width: 14px;
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--paper);
  margin-right: 10px;
  transition: transform 150ms ease;
}
.schedule-table tbody tr.year-divider[aria-expanded="false"] .year-chevron { color: rgba(251, 250, 246, 0.65); }
.schedule-table tbody tr.year-divider .year-label {
  font-weight: 600;
  letter-spacing: 0.14em;
}
.schedule-table tbody tr.year-divider .year-count {
  display: inline-block;
  margin-left: 12px;
  font-family: var(--f-mono);
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: none;
  color: rgba(251, 250, 246, 0.6);
}
.schedule-table tbody tr.month-row.collapsed { display: none; }
.schedule-table tbody tr.placeholder td {
  text-align: center;
  color: var(--ink-500);
  font-family: var(--f-ui);
  padding: 28px 16px;
  font-style: italic;
}
.schedule-table tfoot td {
  font-family: var(--f-mono);
  font-weight: 600;
  background: var(--paper-2);
  border-top: 2px solid var(--ink-900);
  border-bottom: none;
  padding: 12px 16px;
  font-size: 13.5px;
  white-space: nowrap;
}
.schedule-table tfoot td:first-child {
  font-family: var(--f-ui);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11.5px;
  color: var(--ink-500);
}

/* ───────── explainer ───────── */
.explainer { padding: 72px 0; }
.two-col {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 56px;
  align-items: start;
}
.section-title {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0;
  max-width: 24ch;
}
.prose p { margin: 0 0 var(--gap-3); color: var(--ink-700); font-size: 15.5px; line-height: 1.65; }
.prose p:last-child { margin-bottom: 0; }

.formula {
  margin-top: 28px !important;
  padding: 22px;
  background: var(--paper-2);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent);
}
.formula code {
  display: block;
  font-family: var(--f-display);
  font-style: italic;
  font-size: 22px;
  color: var(--ink-900);
  margin-bottom: 14px;
}
.formula code sup { font-size: 0.7em; }
.formula-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--ink-500);
}
.formula-legend b { color: var(--ink-900); font-weight: 600; }

/* ───────── FAQ ───────── */
.faq { padding: 56px 0 88px; }
.faq-list { margin-top: var(--gap-5); }
.faq details {
  border-top: var(--rule);
  padding: 16px 0;
}
.faq details:last-child { border-bottom: var(--rule); }
.faq summary {
  cursor: pointer;
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 17px;
  letter-spacing: -0.005em;
  color: var(--ink-900);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--gap-3);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-family: var(--f-mono);
  font-size: 22px;
  color: var(--ink-300);
  transition: transform 200ms ease, color 200ms ease;
  flex-shrink: 0;
}
.faq details[open] summary::after {
  transform: rotate(45deg);
  color: var(--accent);
}
.faq details p {
  margin: 12px 0 4px;
  color: var(--ink-700);
  font-size: 14.5px;
  line-height: 1.65;
  max-width: 72ch;
}
.faq details code {
  font-family: var(--f-mono);
  font-size: 13px;
  background: var(--paper-2);
  padding: 1px 6px;
  border-radius: 3px;
}

/* ───────── footer ───────── */
.site-foot {
  border-top: var(--rule);
  padding: 22px 0;
  background: var(--paper);
  font-size: 12.5px;
  color: var(--ink-500);
}
.foot-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--gap-3);
}
.foot-links { display: flex; gap: var(--gap-3); }
.foot-links a { color: var(--ink-500); text-decoration: none; }
.foot-links a:hover { color: var(--ink-900); }
.foot-company {
  color: var(--ink-700);
  font-size: 12px;
  letter-spacing: 0.04em;
}
.foot-company strong {
  font-family: var(--f-display);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink-900);
}
.foot-signature {
  margin-top: 8px;
  padding-top: 10px;
  border-top: 1px dashed var(--ink-100);
  text-align: center;
  font-family: var(--f-display);
  font-style: italic;
  font-size: 12.5px;
  color: var(--ink-500);
  letter-spacing: 0.01em;
}
.foot-signature a {
  color: var(--ink-900);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 1px;
}
.foot-signature a:hover {
  color: var(--accent);
}
.foot-signature .sig-url {
  margin-left: 4px;
  font-family: var(--f-mono);
  font-style: normal;
  font-size: 10.5px;
  color: var(--ink-300);
}

/* ───────── responsive ───────── */
@media (max-width: 900px) {
  .calc-grid { grid-template-columns: 1fr; }
  .two-col   { grid-template-columns: 1fr; gap: 28px; }
  .nav-links { display: none; }
}
@media (max-width: 560px) {
  .hero { padding: 36px 0 24px; }
  .panel { padding: 22px; }
  .export-row { grid-template-columns: 1fr; }
  .foot-row { justify-content: center; text-align: center; }
  .schedule-table th, .schedule-table td { padding: 8px 12px; font-size: 12.5px; }
}

/* ───────── print / PDF view ───────── */
@media print {
  .masthead, .calc, .explainer, .faq, .site-foot,
  .actions, .export-row, .radio-row, .schedule-head { display: none !important; }

  body { background: #fff; font-size: 11px; color: #000; }
  .wrap { max-width: 100%; padding: 0 12mm; }

  .schedule { background: #fff; padding: 0; border: none; }
  .table-wrap { border: none; overflow: visible; }
  .schedule-table { font-size: 10px; border-collapse: collapse; width: 100%; }
  .schedule-table th {
    background: #f0f0f0 !important;
    color: #000 !important;
    position: static;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
    border: 1px solid #999;
    padding: 6px 8px;
    font-size: 9.5px;
  }
  .schedule-table td {
    border: 1px solid #ddd;
    padding: 5px 8px;
    font-size: 10.5px;
    background: #fff !important;
  }
  .schedule-table tbody tr.year-divider td {
    background: #222 !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  /* Always show every row on print/PDF, regardless of collapse state */
  .schedule-table tbody tr.month-row.collapsed { display: table-row !important; }
  .schedule-table tbody tr.year-divider .year-chevron { display: none; }
  .schedule-table tbody tr.year-divider .year-count { display: none; }

  /* printable header injected by app.js */
  .print-header {
    display: block !important;
    padding: 0 0 16px;
    border-bottom: 2px solid #000;
    margin-bottom: 16px;
    font-family: var(--f-display);
  }
  .print-header .company-header {
    text-align: right;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid #000;
  }
  .print-header .company-name {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: #000;
  }
  .print-header .company-tagline {
    font-style: italic;
    font-size: 11px;
    color: #444;
    margin-top: 2px;
  }
  .print-header h1 {
    font-size: 22px;
    margin: 0 0 8px;
  }
  .print-header .meta {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px 16px;
    font-family: var(--f-mono);
    font-size: 10.5px;
    color: #000;
  }
  .print-header .meta b { font-weight: 600; }
  .print-header .footer-note {
    margin-top: 12px;
    padding-top: 8px;
    border-top: 1px solid #000;
    font-family: var(--f-ui);
    font-size: 9px;
    font-style: italic;
    color: #000;
  }
  .print-header .signature {
    margin-top: 6px;
    text-align: right;
    font-family: var(--f-display);
    font-size: 10px;
    font-style: italic;
    color: #000;
  }
  .print-header .signature a {
    color: #000;
    text-decoration: underline;
    font-weight: 600;
  }
  .print-header .signature .sig-url {
    margin-left: 6px;
    font-family: var(--f-mono);
    font-size: 8.5px;
    font-style: normal;
    color: #444;
  }
}

/* ───────── screen disclaimer (above footer) ───────── */
.disclaimer {
  background: var(--ink-900);
  color: var(--paper);
  padding: 18px 0;
  border-top: 1px solid var(--ink-700);
}
.disclaimer p {
  margin: 0;
  font-size: 12px;
  line-height: 1.55;
  color: rgba(251, 250, 246, 0.78);
  max-width: 80ch;
}
.disclaimer strong {
  color: var(--paper);
  font-weight: 600;
}
.disclaimer em {
  font-style: italic;
  color: #f3c45c;
}

/* screen-only — print-header hidden */
.print-header { display: none; }

/* ───────── accessibility ───────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}