/*!
 * Shared stylesheet for the tools portfolio (tools.hatchloop.dev).
 * Plain CSS, no framework, no build step. Mobile-first; 44px minimum touch targets.
 */

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f6f8fb;
  --color-surface: #ffffff;
  --color-border: #dfe4ec;
  --color-text: #1a2233;
  --color-text-muted: #5b6577;
  --color-primary: #1656d1;
  --color-primary-dark: #103f9c;
  --color-primary-contrast: #ffffff;
  --color-accent: #0f9d6b;
  --color-danger: #c2410c;
  --color-balance-line: #1656d1;
  --color-interest-line: #e08a1e;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 2px rgba(20, 30, 60, 0.06), 0 4px 16px rgba(20, 30, 60, 0.06);
  --max-width: 960px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f1420;
    --color-bg-alt: #151c2c;
    --color-surface: #171f30;
    --color-border: #2a3450;
    --color-text: #e7ebf5;
    --color-text-muted: #a2acc4;
    --color-primary: #5b8dee;
    --color-primary-dark: #7ea3f2;
    --color-primary-contrast: #08101f;
    --color-accent: #3fd7a0;
    --color-danger: #f4956a;
    --color-balance-line: #5b8dee;
    --color-interest-line: #f2b154;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 20px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

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

img, svg { max-width: 100%; height: auto; }

a { color: var(--color-primary); text-decoration-thickness: 1.5px; }
a:hover { color: var(--color-primary-dark); }

h1, h2, h3, h4 {
  line-height: 1.25;
  font-weight: 700;
  color: var(--color-text);
}
h1 { font-size: clamp(1.6rem, 4vw, 2.3rem); margin: 0 0 .5rem; }
h2 { font-size: clamp(1.3rem, 3vw, 1.6rem); margin: 2.25rem 0 .75rem; }
h3 { font-size: 1.15rem; margin: 1.5rem 0 .5rem; }
p { margin: 0 0 1rem; }
.lede { font-size: 1.1rem; color: var(--color-text-muted); }

/* ---------- Shared page shell ---------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  position: sticky;
  top: 0;
  z-index: 20;
}
.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: .75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.site-logo {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--color-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: .4rem;
  min-height: 44px;
}
.site-logo__mark {
  display: inline-block;
  width: 26px;
  height: 26px;
  /* THE REAL TECHMATE MARK, replacing the gradient placeholder that stood here.
     Done in CSS rather than as an <img> in each page's header on purpose: the
     markup is identical across all five pages, so one rule changes every one of
     them and they cannot drift apart. The span already carries aria-hidden and
     the wordmark beside it carries the name, so there is nothing to caption. */
  background: url("/assets/img/logo-mark-ink-indigo.svg") center / contain no-repeat;
}
.site-nav { display: flex; gap: 1rem; font-size: .9rem; }
.site-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  padding: .5rem .25rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.site-nav a:hover { color: var(--color-primary); }

main { max-width: var(--max-width); margin: 0 auto; padding: 1.25rem 1rem 4rem; }

.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: 3rem;
  padding: 2rem 1rem;
  color: var(--color-text-muted);
  font-size: .85rem;
}
.site-footer__inner { max-width: var(--max-width); margin: 0 auto; }
.site-footer a { color: var(--color-text-muted); }
.footer-links { display: flex; flex-wrap: wrap; gap: .25rem 1rem; margin-top: .75rem; }

.breadcrumb { font-size: .85rem; color: var(--color-text-muted); margin-bottom: .75rem; }
.breadcrumb a { color: var(--color-text-muted); }

/* ---------- Calculator card ---------- */
.calculator {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  margin: 1.25rem 0 2rem;
}

.calc-form {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
@media (min-width: 640px) {
  .calc-form { grid-template-columns: 1fr 1fr; }
  .calc-form .field--wide { grid-column: 1 / -1; }
}

.field { display: flex; flex-direction: column; gap: .35rem; }
.field label {
  font-size: .85rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.field .hint { font-size: .78rem; color: var(--color-text-muted); }

.field input[type="text"],
.field input[type="number"],
.field input[type="date"] {
  min-height: 44px;
  padding: .55rem .7rem;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  width: 100%;
}
.field input:focus {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 35%, transparent);
  outline-offset: 1px;
  border-color: var(--color-primary);
}

.term-row { display: flex; gap: .6rem; }
.term-row .field { flex: 1; }

.input-prefix { position: relative; }
.field .input-prefix input[type="number"],
.field .input-prefix input[type="text"] {
  padding-left: 1.65rem;
}
.input-prefix::before {
  content: attr(data-prefix);
  position: absolute;
  left: .7rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}

.input-suffix { position: relative; }
.field .input-suffix input[type="number"],
.field .input-suffix input[type="text"] {
  padding-right: 2.6rem;
}
.input-suffix::after {
  content: attr(data-suffix);
  position: absolute;
  right: .7rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: .6rem;
  min-height: 44px;
}
.checkbox-row input[type="checkbox"] { width: 20px; height: 20px; }

.extra-payment-fields {
  display: none;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: .5rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--color-border);
}
.extra-payment-fields.is-visible { display: grid; }
@media (min-width: 640px) {
  .extra-payment-fields { grid-template-columns: 1fr 1fr; }
}

.calc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.25rem;
}

.btn {
  min-height: 44px;
  padding: .65rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}
.btn-primary { background: var(--color-primary); color: var(--color-primary-contrast); }
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-secondary {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn-secondary:hover { border-color: var(--color-primary); color: var(--color-primary); }

.field-error {
  color: var(--color-danger);
  font-size: .82rem;
  min-height: 1.1em;
}

/* ---------- Results ---------- */
.results { margin-top: 1.75rem; }
.results[hidden] { display: none; }

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .75rem;
  margin-bottom: 1.5rem;
}
@media (min-width: 640px) {
  .summary-grid { grid-template-columns: repeat(4, 1fr); }
}
.summary-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: .85rem .9rem;
}
.summary-card .label {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--color-text-muted);
  margin-bottom: .25rem;
}
.summary-card .value { font-size: 1.25rem; font-weight: 800; }
.summary-card .value.accent { color: var(--color-accent); }

.extra-summary {
  background: color-mix(in srgb, var(--color-accent) 10%, var(--color-surface));
  border: 1px solid color-mix(in srgb, var(--color-accent) 35%, var(--color-border));
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 1.5rem;
  display: none;
}
.extra-summary.is-visible { display: block; }

.chart-wrap {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: .75rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
}
.amort-chart { display: block; width: 100%; height: auto; min-width: 480px; }
.chart-bg { fill: var(--color-bg-alt); }
.chart-grid { stroke: var(--color-border); stroke-width: 1; }
.chart-line { fill: none; stroke-width: 2.5; }
.chart-line-balance { stroke: var(--color-balance-line); }
.chart-line-interest { stroke: var(--color-interest-line); }
.chart-axis-label { font-size: 11px; fill: var(--color-text-muted); font-family: var(--font-sans); }
.chart-legend-label { font-size: 11px; fill: var(--color-text); font-family: var(--font-sans); }

.table-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  margin-bottom: .5rem;
}
.table-toolbar h3 { margin: 0; }

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}
table.schedule {
  width: 100%;
  border-collapse: collapse;
  font-size: .88rem;
  min-width: 560px;
}
table.schedule th, table.schedule td {
  padding: .55rem .7rem;
  text-align: right;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}
table.schedule th:first-child, table.schedule td:first-child,
table.schedule th:nth-child(2), table.schedule td:nth-child(2) { text-align: left; }
table.schedule thead th {
  position: sticky;
  top: 0;
  background: var(--color-bg-alt);
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .03em;
  color: var(--color-text-muted);
}
table.schedule tbody tr:nth-child(even) { background: var(--color-bg-alt); }
table.schedule tbody tr.is-year-end td { border-bottom: 2px solid var(--color-primary); font-weight: 700; }

.no-js-note {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin: 1rem 0;
}
.js-only { display: none; }
.js .js-only { display: block; }
.js .no-js-only { display: none; }

/* ---------- Content / FAQ ---------- */
.content-section { margin: 2.5rem 0; }
.worked-example {
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1rem 1.25rem;
  margin: 1rem 0;
}
.worked-example table { width: 100%; border-collapse: collapse; margin-top: .5rem; }
.worked-example table td, .worked-example table th {
  padding: .35rem .5rem;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}
.formula-block {
  font-family: var(--font-mono);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  overflow-x: auto;
  font-size: 1.05rem;
  margin: 1rem 0;
}

.faq-list { border-top: 1px solid var(--color-border); }
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: .25rem 0;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 700;
  padding: .85rem .25rem;
  min-height: 44px;
  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: 1.2em;
  color: var(--color-primary);
  font-weight: 800;
}
.faq-item[open] summary::before { content: "\2212"; }
.faq-item p { padding: 0 .25rem .9rem 1.45rem; color: var(--color-text-muted); }

.sibling-links {
  display: grid;
  gap: .75rem;
  grid-template-columns: 1fr;
  margin: 1rem 0;
}
@media (min-width: 640px) {
  .sibling-links { grid-template-columns: repeat(3, 1fr); }
}
.sibling-links a {
  display: block;
  padding: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--color-text);
  background: var(--color-surface);
}
.sibling-links a:hover { border-color: var(--color-primary); }
.sibling-links .sub { display: block; color: var(--color-text-muted); font-size: .85rem; margin-top: .25rem; }

.stub-notice {
  background: var(--color-bg-alt);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  padding: .9rem 1rem;
  font-size: .9rem;
  color: var(--color-text-muted);
  margin: 1rem 0 1.5rem;
}

.tool-card {
  display: block;
  padding: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-text);
  background: var(--color-surface);
  box-shadow: var(--shadow);
}
.tool-card h3 { margin-top: 0; }
.tool-card .status {
  display: inline-block;
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  padding: .15rem .5rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--color-accent) 20%, transparent);
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: .5rem;
}
.tool-grid { display: grid; gap: 1rem; grid-template-columns: 1fr; margin: 1.5rem 0; }
@media (min-width: 640px) { .tool-grid { grid-template-columns: repeat(2, 1fr); } }

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