/*
 * styles.css — [Commander only]. Hand-written, no build step, no framework.
 * System font stack (no web fonts), mobile-first, colours only through custom properties.
 * TODO: [Commander] visual polish pass at CP-3 (desktop + phone viewport in Chrome).
 */

:root {
  --color-bg: #ffffff;
  --color-surface: #f5f7fa;
  --color-text: #1b2430;
  --color-muted: #5a6675;
  --color-border: #d5dbe3;
  --color-accent: #1f5fbf;
  --color-fegli: #d9480f;      /* warning orange-red: the FEGLI line */
  --color-term: #1f5fbf;       /* steady blue: the private term line */
  --color-error: #b3261e;
  --radius: 8px;
  --space: 1rem;
  --max-width: 60rem;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--color-text);
  background: var(--color-bg);
}

[hidden] { display: none !important; }

.wrap { width: min(100% - 2rem, var(--max-width)); margin-inline: auto; }

.skip-link { position: absolute; left: -999px; top: 0; padding: 0.5rem 1rem; background: var(--color-bg); }
.skip-link:focus { left: 0; z-index: 10; }

a { color: var(--color-accent); }
:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; }

h1 { font-size: 1.75rem; line-height: 1.2; margin: 1.5rem 0 0.5rem; }
h2 { font-size: 1.3rem; line-height: 1.25; margin: 2rem 0 0.75rem; }
.lede { color: var(--color-muted); margin-top: 0; }

/* Header / footer */
.site-header { border-bottom: 1px solid var(--color-border); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.5rem 1.5rem; padding-block: 0.75rem; }
.site-name { font-weight: 700; text-decoration: none; color: var(--color-text); }
.site-header nav, .site-footer nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; }
.site-footer { margin-top: 3rem; padding-block: 1.5rem; border-top: 1px solid var(--color-border); background: var(--color-surface); font-size: 0.875rem; color: var(--color-muted); }

/* Form */
.calc-form { display: grid; align-items: start; gap: var(--space); padding: var(--space); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); }
.field { display: grid; gap: 0.25rem; }
.field--check { grid-template-columns: auto 1fr; align-items: center; gap: 0.5rem; }
label { font-weight: 600; }
.field--check label { font-weight: 400; }
input[type="number"], input[type="text"], select { width: 100%; min-height: 2.75rem; padding: 0.5rem 0.75rem; font: inherit; color: inherit; background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius); }
input[type="checkbox"] { width: 1.25rem; height: 1.25rem; }
input[aria-invalid="true"] { border-color: var(--color-error); }
.field-error { margin: 0; font-size: 0.875rem; color: var(--color-error); }
.advanced { border-top: 1px solid var(--color-border); padding-top: 0.75rem; }
.advanced summary { cursor: pointer; font-weight: 600; min-height: 2.75rem; display: flex; align-items: center; }
.advanced[open] { display: grid; align-items: start; gap: var(--space); }

.button { min-height: 2.75rem; padding: 0.6rem 1.25rem; font: inherit; font-weight: 600; color: #fff; background: var(--color-accent); border: 1px solid var(--color-accent); border-radius: var(--radius); cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; }
.button--secondary { color: var(--color-accent); background: var(--color-bg); }
.button--ghost { color: var(--color-text); background: transparent; border-color: var(--color-border); }

.notice { padding: 0.75rem 1rem; border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-surface); }
.placeholder, .estimate-note, .assumptions { color: var(--color-muted); font-size: 0.9375rem; }

/* Results */
.stat-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.75rem; margin: 0; }
.stat { padding: 0.75rem; border: 1px solid var(--color-border); border-radius: var(--radius); }
.stat dt { font-size: 0.8125rem; color: var(--color-muted); }
.stat dd { margin: 0; font-size: 1.375rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.breakdown { width: 100%; margin-top: 1rem; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.breakdown caption { text-align: left; font-weight: 600; padding-bottom: 0.5rem; }
.breakdown th, .breakdown td { padding: 0.5rem 0.25rem; border-bottom: 1px solid var(--color-border); text-align: right; }
.breakdown th:first-child, .breakdown td:first-child { text-align: left; }

/* Chart — class names are the contract with chart-render.js */
.chart { position: relative; width: 100%; touch-action: pan-y; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart-line--fegli, .chart-line--term { fill: none; stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; }
.chart-line--fegli { stroke: var(--color-fegli); }
.chart-line--term { stroke: var(--color-term); }
.chart-area--fegli { fill: var(--color-fegli); opacity: 0.12; }
.chart-area--term { fill: var(--color-term); opacity: 0.12; }
.chart-axis { stroke: var(--color-muted); stroke-width: 1; }
.chart-tick { fill: var(--color-muted); stroke: none; font-size: 0.75rem; }
.chart-axis-label { fill: var(--color-muted); stroke: none; font-size: 0.8125rem; font-weight: 600; }
.chart-grid { stroke: var(--color-border); stroke-width: 1; stroke-dasharray: 2 4; }
.chart-marker--term-end { fill: var(--color-bg); stroke: var(--color-term); stroke-width: 2; }
.chart-focus { stroke: var(--color-muted); stroke-width: 1; }
.chart-tooltip { position: absolute; pointer-events: none; padding: 0.5rem 0.75rem; font-size: 0.8125rem; color: #fff; background: var(--color-text); border-radius: var(--radius); white-space: nowrap; font-variant-numeric: tabular-nums; }

@media (min-width: 40rem) {
  h1 { font-size: 2.25rem; }
  .calc-form { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .calc-form .advanced, .calc-form .button { grid-column: 1 / -1; }
  .calc-form .button { justify-self: start; }
  .advanced[open] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .advanced summary { grid-column: 1 / -1; }
  .stat-row { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

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

/* Content pages + index additions (2026-10-13) */
.source-line { font-size: 0.875rem; color: var(--color-muted); margin-top: 0; }
.field-hint { margin: 0; font-size: 0.8125rem; color: var(--color-muted); }
main h2 { margin-top: 2.25rem; }
main h3 { font-size: 1.05rem; margin: 1.5rem 0 0.5rem; }
main p, main li { max-width: 70ch; }
main ol, main ul { padding-left: 1.4rem; }
main li { margin-bottom: 0.5rem; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.9em; background: var(--color-surface); padding: 0 0.3em; border-radius: 4px; }
.faq-item { border-top: 1px solid var(--color-border); padding: 0.25rem 0; }
.faq-item summary { cursor: pointer; min-height: 2.75rem; display: flex; align-items: center; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before { content: "+"; display: inline-block; width: 1.5rem; font-weight: 700; color: var(--color-accent); }
.faq-item[open] summary::before { content: "\2013"; }
.faq-item summary h3 { margin: 0; font-size: 1.05rem; }
.faq-item p { margin: 0.25rem 0 1rem 1.5rem; }
.chart-data { margin-top: 1rem; }
.chart-data summary { cursor: pointer; min-height: 2.75rem; display: flex; align-items: center; font-weight: 600; }
.chart-table { font-size: 0.875rem; }
.rate-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; font-variant-numeric: tabular-nums; margin: 0.5rem 0 1.5rem; display: block; overflow-x: auto; }
.rate-table caption { text-align: left; font-weight: 600; padding-bottom: 0.5rem; caption-side: top; }
.rate-table th, .rate-table td { padding: 0.4rem 0.5rem; border-bottom: 1px solid var(--color-border); text-align: right; white-space: nowrap; }
.rate-table th:first-child, .rate-table td:first-child { text-align: left; }
.rate-table thead th { background: var(--color-surface); vertical-align: bottom; }
@media (min-width: 60rem) { .rate-table { display: table; } }