/* style.css - calciz. Dark reference-manual layout: sidebar directory of all
   calculators, flat hairline panels, left-aligned content. Results render in
   monospace amber, like LED calculator digits. No gradients, no glow. */

:root {
  --bg:      #121413;
  --panel:   #171a19;
  --panel2:  #1c201e;
  --line:    #2a2f2c;
  --line2:   #3a413d;
  --ink:     #e8ebe8;
  --muted:   #97a29b;
  --faint:   #626d66;
  --amber:   #e8b83c;
  --amber2:  #f4cd6b;
  --amber-dark: #a97f22;
  --err:     #e06c5f;
  --mono:    ui-monospace, "Cascadia Code", Consolas, "SF Mono", monospace;
}

* { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  /* dark thin scrollbars instead of the stock Windows ones */
  scrollbar-color: var(--line2) var(--bg);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--amber); }

/* ---- shell: sidebar + content ---- */
.shell { display: flex; min-height: 100vh; }

.side {
  width: 232px; flex: none;
  border-right: 1px solid var(--line);
  padding: 20px 0 30px;
  position: sticky; top: 0;
  height: 100vh; overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: transparent transparent; /* invisible until hovered */
}
.side:hover { scrollbar-color: var(--line2) transparent; }
.side .brand { display: block; padding: 0 20px 14px; }
.brand {
  font-weight: 700; font-size: 1.15rem; letter-spacing: .01em;
  color: var(--ink); text-decoration: none;
  font-family: var(--mono);
}
.dir { display: block; }
.dir-group summary {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 20px 5px;
  font-size: .7rem; font-weight: 600; letter-spacing: .1em;
  text-transform: uppercase; color: var(--faint);
  cursor: pointer; user-select: none;
  list-style: none;
}
.dir-group summary::-webkit-details-marker { display: none; }
.dir-group summary::before {
  content: ""; flex: none;
  width: 0; height: 0;
  border-left: 4px solid var(--faint);
  border-top: 3px solid transparent;
  border-bottom: 3px solid transparent;
  transition: transform .12s;
}
.dir-group[open] summary::before { transform: rotate(90deg); }
.dir-group summary:hover { color: var(--muted); }
/* expanded state, one look per level: open category = white, open subgroup =
   dark amber, selected link = bright amber */
.dir-group[open] > summary { color: var(--ink); }
.dir-group[open] > summary::before { border-left-color: var(--ink); }
.dir-subgroup[open] > summary { color: var(--amber-dark); }
.dir-subgroup[open] > summary::before { border-left-color: var(--amber-dark); }
.dir-group[open] > summary:hover, .dir-subgroup[open] > summary:hover { color: var(--amber); }
/* indentation: category header text sits at ~31px (20px pad + caret), so its
   children start there, and subgroup children one level deeper */
.dir a {
  display: block;
  padding: 5px 20px 5px 31px;
  border-left: 1px solid transparent;
  color: var(--muted); text-decoration: none; font-size: .875rem;
}
/* nested subcategory groups: indented one level under the category */
.dir-subgroup summary {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 20px 4px 31px;
  font-size: .72rem; font-weight: 600; letter-spacing: .05em;
  color: var(--faint);
  cursor: pointer; user-select: none;
  list-style: none;
}
.dir-subgroup summary::-webkit-details-marker { display: none; }
.dir-subgroup summary::before {
  content: ""; flex: none;
  width: 0; height: 0;
  border-left: 4px solid var(--faint);
  border-top: 3px solid transparent;
  border-bottom: 3px solid transparent;
  transition: transform .12s;
}
.dir-subgroup[open] summary::before { transform: rotate(90deg); }
.dir-subgroup summary:hover { color: var(--muted); }
.dir-subgroup a { padding-left: 42px; }
.dir a:hover { color: var(--ink); background: var(--panel); }
.dir a.on {
  color: var(--amber);
  border-left: 1px solid var(--amber);
  background: var(--panel);
}

.main-col { flex: 1; min-width: 0; display: flex; flex-direction: column; }

/* ---- mobile topbar (hidden on desktop) ---- */
.topbar {
  display: none;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  align-items: center; gap: 12px;
}
.menu-btn {
  display: flex; align-items: center; justify-content: center;
  background: none; border: 1px solid var(--line2); border-radius: 6px;
  color: var(--muted); cursor: pointer;
  width: 38px; height: 38px; padding: 7px;
}
.menu-btn svg { width: 22px; height: 22px; }
.backdrop { display: none; }

/* ---- content ---- */
.wrap { max-width: 780px; padding: 38px 44px 60px; }

h1 {
  font-size: 1.8rem; line-height: 1.2; margin: 0 0 8px;
  font-weight: 700; letter-spacing: -.01em;
}
.sub { color: var(--muted); margin: 0 0 26px; max-width: 600px; }

/* ---- calculator: form + results ---- */
.calc-card {
  display: grid; grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  overflow: hidden;
}
.calc-form { padding: 20px; display: flex; flex-direction: column; gap: 13px; }
.field { display: flex; flex-direction: column; gap: 4px; }
.field[hidden] { display: none; }
.field label { font-size: .8rem; font-weight: 600; color: var(--muted); }
.inwrap { position: relative; display: flex; align-items: center; }
.inwrap .unit {
  position: absolute; right: 12px; color: var(--muted);
  font-size: .95rem; pointer-events: none; font-family: var(--mono);
}
input[type="number"], input[type="date"], input[type="time"], input[type="text"], select, textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--line2);
  border-radius: 4px;
  color: var(--ink);
  font: inherit;
  padding: 8px 10px;
  outline: none;
}
input[type="number"], textarea { font-family: var(--mono); font-size: .92rem; }
/* native spinner buttons clash with the dark theme and sit under the unit chip */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; appearance: textfield; }
.inwrap input[type="number"] { padding-right: 52px; }
input:focus, select:focus, textarea:focus { border-color: var(--amber); }
input[type="date"], input[type="time"] { color-scheme: dark; }
textarea { resize: vertical; min-height: 54px; }
.help { font-size: .74rem; color: var(--faint); }
button.go {
  margin-top: 2px;
  background: none;
  border: 1px solid var(--amber);
  color: var(--amber);
  font: inherit; font-weight: 600; font-size: .92rem;
  border-radius: 4px; padding: 9px 16px;
  cursor: pointer;
}
button.go:hover { background: var(--amber); color: #171204; }

/* ---- results: receipt rows, LED digits ---- */
.calc-results {
  background: var(--panel2);
  border-left: 1px solid var(--line);
  padding: 20px;
  min-height: 200px;
}
.res-big { padding: 2px 0 12px; margin-bottom: 6px; border-bottom: 1px solid var(--line2); }
.res-big .res-label {
  font-size: .7rem; font-weight: 600; color: var(--muted);
  text-transform: uppercase; letter-spacing: .1em;
}
.res-big .res-value {
  font-family: var(--mono); font-variant-numeric: tabular-nums;
  font-size: 1.9rem; font-weight: 600;
  color: var(--amber);
  overflow-wrap: anywhere;
}
.res-row {
  display: flex; justify-content: space-between; align-items: baseline; gap: 12px;
  padding: 6px 0;
  border-bottom: 1px dotted var(--line);
  font-size: .9rem;
}
.res-row:last-child { border-bottom: 0; }
.res-row .res-label { color: var(--muted); }
.res-row .res-value {
  font-family: var(--mono); font-variant-numeric: tabular-nums;
  text-align: right; overflow-wrap: anywhere;
}
.calc-error { color: var(--err); font-size: .9rem; padding: 4px 0; }

/* result tables (e.g. amortization schedule) */
.res-table {
  width: 100%; border-collapse: collapse;
  margin-top: 10px; font-size: .8rem;
}
.res-table th {
  text-align: right; font-weight: 600; color: var(--faint);
  text-transform: uppercase; letter-spacing: .06em; font-size: .66rem;
  padding: 4px 2px; border-bottom: 1px solid var(--line2);
}
.res-table th:first-child, .res-table td:first-child { text-align: left; }
.res-table td {
  text-align: right; padding: 4px 2px;
  border-bottom: 1px dotted var(--line);
  font-family: var(--mono); font-variant-numeric: tabular-nums;
  color: var(--ink);
}
.res-table tr:last-child td { border-bottom: 0; }

@media (max-width: 900px) {
  /* sidebar becomes a slide-in drawer behind the hamburger */
  .side {
    position: fixed; top: 0; left: 0; bottom: 0;
    height: 100dvh; width: 280px; max-width: 85vw;
    background: var(--bg);
    z-index: 100;
    transform: translateX(-102%);
    transition: transform .18s ease-out;
    box-shadow: 12px 0 40px rgba(0,0,0,.5);
  }
  body.menu-open .side { transform: none; }
  body.menu-open { overflow: hidden; }
  body.menu-open .backdrop {
    display: block; position: fixed; inset: 0;
    background: rgba(0,0,0,.55); z-index: 90;
  }
  .topbar { display: flex; }
  .wrap { padding: 26px 20px 50px; }
  .calc-card { grid-template-columns: 1fr; }
  .calc-results { border-left: 0; border-top: 1px solid var(--line); min-height: 0; }
  h1 { font-size: 1.5rem; }
  /* inputs below 16px make iOS Safari zoom the page on focus */
  input[type="number"], input[type="date"], input[type="text"], input[type="time"],
  select, textarea { font-size: 16px; }
}

/* ---- content sections ---- */
.seo { margin-top: 30px; color: var(--muted); max-width: 640px; }
.seo h2 { color: var(--ink); font-size: 1.1rem; margin: 0 0 8px; font-weight: 700; }
.seo p { margin: 0 0 11px; }
.seo b { color: var(--ink); }
.formula {
  font-family: var(--mono); font-size: .88rem;
  color: var(--amber2);
  border-left: 2px solid var(--line2);
  padding: 6px 0 6px 14px;
  overflow-x: auto;
}

.related { margin-top: 36px; }
.related h2 { font-size: .95rem; color: var(--faint); font-weight: 600; margin: 0 0 8px; }
.related .links { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.related .links a { font-size: .88rem; }

/* in-content conversion tables (generated, static) */
.conv-table {
  border-collapse: collapse; font-size: .88rem;
  min-width: 260px;
}
.conv-table th {
  text-align: right; font-weight: 600; color: var(--faint);
  text-transform: uppercase; letter-spacing: .06em; font-size: .68rem;
  padding: 5px 18px 5px 2px; border-bottom: 1px solid var(--line2);
}
.conv-table td {
  text-align: right; padding: 5px 18px 5px 2px;
  border-bottom: 1px dotted var(--line);
  font-family: var(--mono); font-variant-numeric: tabular-nums;
  color: var(--ink);
}

/* ---- ad slot ---- */
.ad-slot { margin: 26px 0 0; }

/* ---- index directory ---- */
.cat { margin-top: 34px; }
.cat h2 {
  font-size: .78rem; font-weight: 600; letter-spacing: .1em;
  text-transform: uppercase; color: var(--faint);
  margin: 0 0 6px;
}
ul.toc { list-style: none; margin: 0; padding: 0; }
.toc-sub {
  padding: 14px 0 2px !important; border-bottom: 0 !important;
  font-size: .7rem; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; color: var(--faint);
}
.toc li {
  display: flex; align-items: baseline; gap: 14px;
  padding: 8px 0;
  border-bottom: 1px dotted var(--line);
}
.toc a { color: var(--ink); text-decoration: none; font-weight: 600; font-size: .95rem; white-space: nowrap; }
.toc a:hover { color: var(--amber); }
.toc-desc { color: var(--faint); font-size: .84rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@media (max-width: 640px) {
  .toc li { flex-direction: column; gap: 1px; }
  .toc-desc { white-space: normal; }
}

/* ---- settings gear (top right, all pages) ---- */
.main-col { position: relative; }
.settings { position: absolute; top: 14px; right: 18px; z-index: 20; }
.settings-btn {
  background: none; border: 1px solid transparent; border-radius: 6px;
  color: var(--faint); cursor: pointer;
  width: 34px; height: 34px; padding: 6px;
  display: flex; align-items: center; justify-content: center;
}
.settings-btn svg { width: 20px; height: 20px; }
.settings-btn:hover { color: var(--ink); border-color: var(--line2); }
.settings-panel {
  position: absolute; top: 40px; right: 0;
  background: var(--panel);
  border: 1px solid var(--line2);
  border-radius: 8px;
  padding: 14px 16px;
  box-shadow: 0 12px 34px rgba(0,0,0,.5);
  min-width: 220px;
}
.prefs { display: flex; flex-direction: column; gap: 10px; }
.prefs label {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  font-size: .72rem; font-weight: 600; letter-spacing: .06em;
  text-transform: uppercase; color: var(--faint);
}
.prefs select {
  width: auto; padding: 4px 8px; font-size: .82rem;
  background: var(--bg); border: 1px solid var(--line2);
  border-radius: 4px; color: var(--ink);
}
@media (max-width: 900px) {
  .topbar { padding-right: 60px; }
}

/* ---- footer ---- */
.foot {
  margin-top: auto;
  border-top: 1px solid var(--line);
  padding: 16px 44px 26px;
  display: flex; gap: 18px; flex-wrap: wrap;
  font-size: .82rem;
}
.foot a { color: var(--muted); text-decoration: none; }
.foot a:hover { color: var(--ink); }
.foot .tag { color: var(--faint); margin-left: auto; }
@media (max-width: 900px) { .foot { padding: 16px 20px 26px; } }