/* ==========================================================================
   LEDGER — a calculator/finance utility site
   Design concept: a working financial ledger. Category tabs read like
   folder tabs, results print like ledger line-items with dotted leaders
   and tabular monospace figures, hairline rules throughout.
   ========================================================================== */

:root {
  /* Color */
  --ink: #132320;
  --paper: #F6F4EC;
  --paper-soft: #EFEBDD;
  --paper-raised: #FFFFFF;
  --emerald: #1B7A5B;
  --emerald-dark: #0F5A42;
  --emerald-tint: #E4F0EA;
  --amber: #C97A2B;
  --amber-tint: #F7E9D8;
  --line: #D8D3C4;
  --line-strong: #B9B29C;
  --text: #1E2A27;
  --text-soft: #5B6864;
  --text-faint: #8C9490;
  --danger: #B33B3B;

  /* Type */
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  /* Layout */
  --max-width: 1180px;
  --radius: 3px;
  --shadow-card: 0 1px 2px rgba(19, 35, 32, 0.06), 0 6px 20px rgba(19, 35, 32, 0.05);
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--emerald-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

:focus-visible {
  outline: 2px solid var(--emerald);
  outline-offset: 2px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  margin: 0 0 0.5em;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(1.9rem, 3.4vw, 2.6rem); }
h2 { font-size: clamp(1.4rem, 2.4vw, 1.85rem); }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1em; color: var(--text); }
.text-soft { color: var(--text-soft); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--emerald-dark);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.eyebrow::before {
  content: "";
  width: 16px;
  height: 1px;
  background: var(--emerald);
  display: inline-block;
}

/* ==========================================================================
   HEADER / TAB NAVIGATION
   ========================================================================== */

.site-header {
  background: var(--ink);
  color: var(--paper);
  border-bottom: 3px solid var(--emerald);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
}
.brand:hover { text-decoration: none; opacity: 0.9; }
.brand .mark {
  font-family: var(--font-mono);
  background: var(--emerald);
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 2px;
  letter-spacing: 0;
}
.brand .tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  align-self: center;
}

.search-form { flex: 1; max-width: 360px; display: none; }
.search-form input {
  width: 100%;
  background: rgba(246, 244, 236, 0.08);
  border: 1px solid rgba(246, 244, 236, 0.2);
  color: var(--paper);
  border-radius: var(--radius);
  padding: 8px 12px;
  font-family: var(--font-body);
  font-size: 0.88rem;
}
.search-form input::placeholder { color: var(--text-faint); }
.search-form input:focus { outline: 1px solid var(--emerald); background: rgba(246,244,236,0.12); }

.menu-toggle {
  display: inline-flex;
  background: none;
  border: 1px solid rgba(246, 244, 236, 0.3);
  color: var(--paper);
  border-radius: var(--radius);
  padding: 8px 10px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.tab-nav {
  border-top: 1px solid rgba(246, 244, 236, 0.12);
  overflow-x: auto;
  scrollbar-width: thin;
}
.tab-nav .container { display: flex; gap: 2px; padding: 0 24px; }
.tab-nav ul {
  list-style: none;
  display: flex;
  margin: 0;
  padding: 0;
  gap: 2px;
  white-space: nowrap;
}
.tab-nav a {
  display: inline-block;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 12px 14px 10px;
  border-bottom: 3px solid transparent;
  position: relative;
  top: 1px;
}
.tab-nav a:hover, .tab-nav a.active {
  color: var(--paper);
  text-decoration: none;
  border-bottom-color: var(--emerald);
}

/* Mobile drawer */
.mobile-nav {
  display: none;
  background: var(--ink);
  border-top: 1px solid rgba(246,244,236,0.12);
}
.mobile-nav.open { display: block; }
.mobile-nav .container { padding: 14px 24px 20px; }
.mobile-nav details { border-bottom: 1px solid rgba(246,244,236,0.12); }
.mobile-nav summary {
  padding: 10px 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--paper);
  cursor: pointer;
}
.mobile-nav ul { list-style: none; margin: 0 0 10px; padding: 0 0 0 8px; }
.mobile-nav a { display: block; padding: 6px 0; color: var(--text-faint); font-size: 0.9rem; }
.mobile-nav a:hover { color: var(--paper); text-decoration: none; }

/* ==========================================================================
   HERO / PAGE HEAD
   ========================================================================== */

.page-hero {
  background: var(--ink);
  color: var(--paper);
  padding: 40px 0 34px;
  background-image:
    linear-gradient(rgba(246,244,236,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(246,244,236,0.045) 1px, transparent 1px);
  background-size: 28px 28px;
}
.page-hero h1 { color: var(--paper); margin-bottom: 10px; }
.page-hero .lede { color: #C9D2CE; max-width: 62ch; font-size: 1.02rem; margin-bottom: 0; }
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}
.breadcrumb a { color: var(--text-faint); }
.breadcrumb a:hover { color: var(--paper); }

/* Home hero */
.home-hero { padding: 64px 0 48px; }
.home-hero h1 { max-width: 16ch; font-size: clamp(2.2rem, 5vw, 3.4rem); }
.home-hero .lede { font-size: 1.1rem; max-width: 56ch; }
.home-hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 28px;
  font-family: var(--font-mono);
}
.home-hero-stats div { border-left: 2px solid var(--emerald); padding-left: 12px; }
.home-hero-stats strong { display: block; font-size: 1.6rem; color: var(--paper); }
.home-hero-stats span { font-size: 0.72rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.06em; }

/* ==========================================================================
   MAIN CONTENT LAYOUT
   ========================================================================== */

main { padding: 40px 0 64px; }

.calc-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 28px;
  align-items: start;
}

.card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.calc-form-card { padding: 26px 28px 24px; }
.calc-form-card h2 { font-size: 1.05rem; margin-bottom: 4px; }
.card-note { font-size: 0.85rem; color: var(--text-soft); margin-bottom: 20px; }

.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 18px; }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 4px; }
.field.full { grid-column: 1 / -1; }
.field label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-soft);
}
.input-wrap { position: relative; display: flex; align-items: center; }
.input-wrap .prefix, .input-wrap .suffix {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--text-faint);
  pointer-events: none;
}
.input-wrap .prefix { left: 12px; }
.input-wrap .suffix { right: 12px; }
.field input, .field select {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 0.98rem;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
}
.field input.has-prefix { padding-left: 26px; }
.field input.has-suffix { padding-right: 34px; }
.field input:focus, .field select:focus { outline: none; border-color: var(--emerald); box-shadow: 0 0 0 3px var(--emerald-tint); }

.btn {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border: none;
  border-radius: var(--radius);
  padding: 13px 22px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary { background: var(--emerald); color: #fff; width: 100%; justify-content: center; margin-top: 8px; font-weight: 600; }
.btn-primary:hover { background: var(--emerald-dark); }
.btn-ghost { background: transparent; border: 1px solid var(--line-strong); color: var(--text-soft); }
.btn-ghost:hover { border-color: var(--emerald); color: var(--emerald-dark); }

/* Result ledger */
.result-card { padding: 0; overflow: hidden; }
.result-head {
  background: var(--ink);
  color: var(--paper);
  padding: 18px 26px;
}
.result-head .eyebrow { color: #9FD4BE; }
.result-head::before { background: var(--emerald); }
.result-headline { font-family: var(--font-display); font-size: 2.1rem; color: #fff; margin-top: 6px; }
.result-headline .cents { font-size: 1.1rem; color: #B9C7C1; }
.result-sub { font-family: var(--font-mono); font-size: 0.8rem; color: #9FB3AC; }

.ledger { padding: 6px 26px 20px; }
.ledger-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 0.92rem;
}
.ledger-row:last-child { border-bottom: none; }
.ledger-row .label { color: var(--text-soft); white-space: nowrap; }
.ledger-row .fill { flex: 1; border-bottom: 1px dotted var(--line-strong); transform: translateY(-4px); }
.ledger-row .value { font-family: var(--font-mono); font-weight: 600; color: var(--ink); white-space: nowrap; }
.ledger-row .value.neg { color: var(--danger); }
.ledger-row .value.pos { color: var(--emerald-dark); }

.chart-wrap { padding: 4px 26px 26px; }
.chart-wrap canvas { width: 100% !important; height: 240px !important; }
.chart-caption { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-faint); text-align: center; margin-top: 8px; }

.empty-state {
  padding: 40px 26px;
  text-align: center;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* Schedule table */
.table-wrap { overflow-x: auto; margin-top: 12px; }
table.schedule { width: 100%; border-collapse: collapse; font-family: var(--font-mono); font-size: 0.82rem; }
table.schedule th, table.schedule td { padding: 8px 10px; text-align: right; border-bottom: 1px solid var(--line); white-space: nowrap; }
table.schedule th:first-child, table.schedule td:first-child { text-align: left; }
table.schedule th { color: var(--text-soft); text-transform: uppercase; font-size: 0.68rem; letter-spacing: 0.05em; border-bottom: 2px solid var(--line-strong); }

/* ==========================================================================
   INFO SECTIONS: description / formula / faq
   ========================================================================== */

.section { padding: 44px 0; border-top: 1px solid var(--line); }
.section-head { margin-bottom: 22px; max-width: 70ch; }

.formula-box {
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-left: 4px solid var(--amber);
  border-radius: var(--radius);
  padding: 18px 22px;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--ink);
  margin: 18px 0;
  overflow-x: auto;
}
.formula-vars { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 8px 20px; margin-top: 16px; }
.formula-vars div { font-size: 0.88rem; }
.formula-vars b { font-family: var(--font-mono); color: var(--emerald-dark); }

.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary {
  padding: 16px 4px;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--ink);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--emerald);
  font-size: 1.3rem;
  flex-shrink: 0;
}
.faq-item[open] summary::after { content: "\2212"; }
.faq-item p { padding: 0 4px 18px; color: var(--text-soft); max-width: 72ch; }

/* Related calculators */
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }

/* ==========================================================================
   CARDS / GRIDS (homepage + category)
   ========================================================================== */

.category-tabs-strip {
  background: var(--paper-soft);
  border-bottom: 1px solid var(--line);
  border-top: 1px solid var(--line);
  padding: 14px 0;
  overflow-x: auto;
}
.category-tabs-strip ul { list-style: none; display: flex; gap: 10px; margin: 0; padding: 0; white-space: nowrap; }
.category-tabs-strip a {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-soft);
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  padding: 7px 14px;
  display: inline-block;
}
.category-tabs-strip a:hover { border-color: var(--emerald); color: var(--emerald-dark); text-decoration: none; }

.category-block { padding: 38px 0; border-top: 1px solid var(--line); }
.category-block-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 18px; }
.category-block-head h2 { margin-bottom: 2px; }
.category-index { font-family: var(--font-mono); color: var(--text-faint); font-size: 0.85rem; }

.calc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }

.calc-card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  display: block;
  position: relative;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.calc-card:hover { border-color: var(--emerald); text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow-card); }
.calc-card .num { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-faint); }
.calc-card h3 { font-size: 1rem; margin: 6px 0 6px; color: var(--ink); }
.calc-card p { font-size: 0.85rem; color: var(--text-soft); margin: 0; }

/* Category folder tabs on homepage */
.folder-tabs { display: flex; flex-wrap: wrap; gap: 10px; margin: 28px 0 0; }
.folder-tab {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-bottom: 3px solid var(--emerald);
  border-radius: 4px 4px 0 0;
  padding: 14px 18px;
  flex: 1 1 210px;
  min-width: 210px;
}
.folder-tab .eyebrow { font-size: 0.65rem; }
.folder-tab h3 { font-size: 1rem; margin: 6px 0 10px; }
.folder-tab ul { list-style: none; margin: 0; padding: 0; }
.folder-tab li { margin-bottom: 5px; }
.folder-tab a { font-size: 0.86rem; color: var(--text-soft); }
.folder-tab a:hover { color: var(--emerald-dark); }
.folder-tab .more { font-family: var(--font-mono); font-size: 0.74rem; color: var(--emerald-dark); display: inline-block; margin-top: 6px; }

/* ==========================================================================
   FOOTER
   ========================================================================== */

.site-footer { background: var(--ink); color: var(--text-faint); padding: 48px 0 28px; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr repeat(auto-fit, minmax(150px, 1fr)); gap: 28px; }
.footer-col h4 { color: var(--paper); font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 12px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 7px; }
.footer-col a { color: var(--text-faint); font-size: 0.86rem; }
.footer-col a:hover { color: var(--paper); }
.footer-brand { color: var(--paper); font-family: var(--font-display); font-size: 1.2rem; margin-bottom: 10px; }
.footer-disclaimer { font-size: 0.8rem; line-height: 1.6; max-width: 40ch; color: var(--text-faint); }
.footer-bottom {
  border-top: 1px solid rgba(246,244,236,0.12);
  margin-top: 36px;
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

/* ==========================================================================
   UTILITIES / RESPONSIVE
   ========================================================================== */

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--amber-tint);
  color: var(--amber);
  border: 1px solid var(--amber);
  border-radius: 10px;
  padding: 2px 8px;
  margin-left: 6px;
}

@media (max-width: 900px) {
  .calc-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .tab-nav { display: none; }
  .menu-toggle { display: inline-flex; }
}

@media (min-width: 640px) {
  .search-form { display: block; }
}

@media (max-width: 640px) {
  .field-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .home-hero-stats { flex-wrap: wrap; gap: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .calc-card { transition: none; }
}