/* calc.bitgeek.in — "the ledger" design system.
   Warm paper, ink, ledger green, vermilion for shortfalls. Fraunces display,
   Karla body, Spline Sans Mono for every number. */

:root {
  --paper: #f6f1e7;
  --paper-deep: #efe7d7;
  --ink: #191611;
  --ink-soft: #4d463a;
  --rule: #d8cdb6;
  --rule-hard: #b9ac8f;
  --green: #14523d;
  --green-bright: #1c7a58;
  --red: #bb3a1d;
  --gold: #a97d1e;
  --chip: #e9e0cc;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Karla", "Segoe UI", sans-serif;
  --mono: "Spline Sans Mono", "SFMono-Regular", Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  background-image: repeating-linear-gradient(
    to bottom, transparent 0 31px, rgba(120, 100, 60, .07) 31px 32px);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--green); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--green-bright); }

.wrap { max-width: 1060px; margin: 0 auto; padding: 0 22px; }

/* ---------- masthead ---------- */
header.masthead {
  border-bottom: 3px double var(--rule-hard);
  background: var(--paper);
}
.masthead .wrap {
  display: flex; align-items: baseline; gap: 18px;
  padding-top: 20px; padding-bottom: 14px; flex-wrap: wrap;
}
.brand {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 1.7rem;
  letter-spacing: -.02em;
  color: var(--ink);
  text-decoration: none;
}
.brand .tld { color: var(--green); }
.tagline {
  color: var(--ink-soft); font-size: .85rem;
  letter-spacing: .14em; text-transform: uppercase;
}
.masthead nav { margin-left: auto; display: flex; gap: 16px; align-items: baseline; }
.masthead nav a { font-size: .9rem; text-decoration: none; border-bottom: 1px solid transparent; }
.masthead nav a:hover { border-bottom-color: var(--green); }
.nav-chip {
  font-family: var(--mono); font-size: .78rem;
  border: 1.5px solid var(--ink); padding: 3px 10px; border-radius: 2px;
  background: var(--chip);
}

/* ---------- hero / landing ---------- */
.hero { padding: 56px 0 30px; }
.hero h1 {
  font-family: var(--serif); font-weight: 900; font-size: clamp(2.3rem, 5.5vw, 3.6rem);
  line-height: 1.04; letter-spacing: -.025em; margin: 0 0 14px; max-width: 17ch;
}
.hero h1 em { font-style: italic; color: var(--green); }
.hero p.lede { max-width: 56ch; color: var(--ink-soft); font-size: 1.06rem; margin: 0 0 30px; }

.searchbar { position: relative; max-width: 620px; }
.searchbar input {
  width: 100%; font-family: var(--mono); font-size: 1.05rem;
  padding: 15px 52px 15px 18px;
  border: 2px solid var(--ink); border-radius: 3px;
  background: #fffdf7; color: var(--ink);
  box-shadow: 4px 4px 0 rgba(25, 22, 17, .9);
  outline: none;
}
.searchbar input:focus { box-shadow: 4px 4px 0 var(--green); border-color: var(--green); }
.searchbar .hint {
  position: absolute; right: 14px; top: 50%; transform: translateY(-50%);
  font-family: var(--mono); font-size: .75rem; color: var(--ink-soft);
  border: 1px solid var(--rule-hard); border-radius: 3px; padding: 2px 7px; background: var(--chip);
}

.calc-answer {
  display: flex; align-items: baseline; gap: 12px; max-width: 620px;
  margin-top: 12px; padding: 12px 18px;
  background: var(--chip); border: 1.5px solid var(--ink); border-radius: 3px;
  font-family: var(--mono);
}
.calc-answer .ca-eq { color: var(--green); font-weight: 700; font-size: 1.2rem; }
.calc-answer .ca-val { font-size: 1.25rem; font-weight: 600; }
.calc-answer .ca-alt { color: var(--ink-soft); font-size: .85rem; }

/* ---------- calculator index ---------- */
.group-head {
  display: flex; align-items: baseline; gap: 14px;
  margin: 40px 0 6px; border-bottom: 2px solid var(--ink); padding-bottom: 6px;
}
.group-head h2 {
  font-family: var(--serif); font-weight: 700; font-size: 1.35rem; margin: 0; letter-spacing: -.01em;
}
.group-head .count { font-family: var(--mono); font-size: .8rem; color: var(--ink-soft); }

.calc-row {
  display: grid; grid-template-columns: 92px 1fr auto;
  gap: 18px; align-items: baseline;
  padding: 15px 4px; border-bottom: 1px solid var(--rule);
  text-decoration: none; color: inherit;
}
a.calc-row:hover { background: rgba(20, 82, 61, .05); }
a.calc-row:hover .calc-name { color: var(--green-bright); }
.abbr-stamp {
  font-family: var(--mono); font-size: .8rem; font-weight: 600;
  border: 1.5px solid var(--ink); border-radius: 2px;
  padding: 3px 0; text-align: center; background: var(--chip);
  letter-spacing: .05em;
}
.calc-row.soon .abbr-stamp { border-style: dashed; color: var(--ink-soft); border-color: var(--rule-hard); }
.calc-name { font-family: var(--serif); font-weight: 700; font-size: 1.12rem; }
.calc-blurb { color: var(--ink-soft); font-size: .93rem; margin-top: 2px; }
.soon-tag {
  font-family: var(--mono); font-size: .72rem; text-transform: uppercase;
  letter-spacing: .12em; color: var(--gold); white-space: nowrap;
}
.go-arrow { font-family: var(--mono); color: var(--green); }
.no-results { padding: 40px 0; color: var(--ink-soft); font-style: italic; }

/* ---------- section nav (contents strip) ---------- */
.section-nav {
  position: sticky; top: 0; z-index: 40;
  display: flex; gap: 4px; overflow-x: auto;
  margin: 0 0 18px; padding: 8px 2px;
  background: var(--paper);
  border-top: 1px solid var(--rule); border-bottom: 2px solid var(--ink);
  scrollbar-width: none;
}
.section-nav::-webkit-scrollbar { display: none; }
.section-nav a {
  font-family: var(--mono); font-size: .78rem; white-space: nowrap;
  text-decoration: none; color: var(--ink-soft);
  padding: 4px 11px; border: 1.5px solid transparent; border-radius: 2px;
}
.section-nav a:hover { color: var(--green-bright); border-color: var(--rule-hard); }
.section-nav a.here { color: var(--green); border-color: var(--ink); background: var(--chip); font-weight: 600; }

/* ---------- calc page layout ---------- */
.crumbs { font-family: var(--mono); font-size: .78rem; margin: 22px 0 0; color: var(--ink-soft); }
.crumbs a { color: var(--ink-soft); }
.page-title {
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(1.9rem, 4.5vw, 2.8rem); letter-spacing: -.02em;
  line-height: 1.08; margin: 10px 0 6px;
}
.page-sub { color: var(--ink-soft); max-width: 62ch; margin: 0 0 26px; }
.claim-note { font-size: .85rem; font-family: var(--mono); color: var(--ink-soft); margin: 4px 0 0; }

.panel {
  background: #fffdf7;
  border: 2px solid var(--ink); border-radius: 4px;
  box-shadow: 6px 6px 0 rgba(25, 22, 17, .88);
  padding: 26px 26px 22px;
  margin: 10px 0 44px;
}
.panel h2.panel-title {
  font-family: var(--serif); font-size: 1.25rem; margin: 0 0 18px;
  padding-bottom: 10px; border-bottom: 2px solid var(--ink);
  display: flex; justify-content: space-between; align-items: baseline; gap: 10px;
}
.panel h2.panel-title .mono-tag { font-family: var(--mono); font-size: .72rem; color: var(--ink-soft); font-weight: 400; }

.fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 16px 20px; }
.field label {
  display: block; font-size: .78rem; text-transform: uppercase;
  letter-spacing: .1em; color: var(--ink-soft); margin-bottom: 5px; font-weight: 700;
}
.field input, .field select {
  width: 100%; font-family: var(--mono); font-size: 1rem;
  padding: 10px 12px; border: 1.5px solid var(--ink); border-radius: 3px;
  background: var(--paper); color: var(--ink);
}
.field input:focus, .field select:focus { outline: 2px solid var(--green); outline-offset: 1px; }
.field .unit-note { font-size: .75rem; color: var(--ink-soft); margin-top: 3px; font-family: var(--mono); }

/* results */
.results { margin-top: 24px; border-top: 1px dashed var(--rule-hard); padding-top: 18px; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 14px; }
.stat { border-left: 3px solid var(--green); padding: 4px 0 4px 14px; }
.stat.bad { border-left-color: var(--red); }
.stat.warn { border-left-color: var(--gold); }
.stat .k { font-size: .74rem; text-transform: uppercase; letter-spacing: .11em; color: var(--ink-soft); font-weight: 700; }
.stat .v { font-family: var(--mono); font-size: 1.45rem; font-weight: 600; line-height: 1.3; }
.stat .v.bad { color: var(--red); }
.stat .v.good { color: var(--green-bright); }
.stat .sub { font-size: .8rem; color: var(--ink-soft); }

table.ledger { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: .87rem; margin-top: 14px; }
table.ledger th {
  text-align: right; font-size: .72rem; text-transform: uppercase; letter-spacing: .08em;
  border-bottom: 2px solid var(--ink); padding: 6px 10px; color: var(--ink-soft);
}
table.ledger th:first-child, table.ledger td:first-child { text-align: left; }
table.ledger td { text-align: right; padding: 6px 10px; border-bottom: 1px solid var(--rule); }
table.ledger tr.bad td { color: var(--red); }
table.ledger tr.total td { border-top: 2px solid var(--ink); font-weight: 700; border-bottom: none; }
.table-scroll { overflow-x: auto; }

/* row editor (MAB, OD) */
.row-editor { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; }
.row-line { display: grid; grid-template-columns: 1fr 1fr 36px; gap: 10px; }
.row-line input {
  font-family: var(--mono); padding: 8px 10px;
  border: 1.5px solid var(--ink); border-radius: 3px; background: var(--paper); width: 100%;
}
.row-line button.del {
  border: 1.5px solid var(--rule-hard); background: none; border-radius: 3px;
  color: var(--red); cursor: pointer; font-size: 1rem;
}
.row-line button.del:hover { border-color: var(--red); }

/* buttons */
.btn {
  font-family: var(--mono); font-size: .92rem; font-weight: 600;
  border: 2px solid var(--ink); border-radius: 3px; cursor: pointer;
  padding: 10px 20px; background: var(--green); color: #fdfaf2;
  box-shadow: 3px 3px 0 rgba(25, 22, 17, .85);
  transition: transform .06s ease, box-shadow .06s ease;
}
.btn:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 rgba(25, 22, 17, .85); }
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 rgba(25, 22, 17, .85); }
.btn.ghost { background: var(--chip); color: var(--ink); }
.btn.small { padding: 6px 12px; font-size: .8rem; box-shadow: 2px 2px 0 rgba(25,22,17,.85); }
.btn-row { display: flex; gap: 12px; margin-top: 20px; flex-wrap: wrap; align-items: center; }
.share-out { font-family: var(--mono); font-size: .85rem; color: var(--green); word-break: break-all; }

/* ---------- explainer prose ---------- */
.explainer { max-width: 720px; margin-bottom: 70px; }
.explainer h2 {
  font-family: var(--serif); font-weight: 900; font-size: 1.6rem; letter-spacing: -.015em;
  margin: 44px 0 12px; padding-top: 14px; border-top: 2px solid var(--ink);
}
.explainer h2 .idx { font-family: var(--mono); font-size: .85rem; color: var(--green); font-weight: 400; vertical-align: super; margin-right: 8px; }
.explainer h3 { font-family: var(--serif); font-size: 1.15rem; margin: 26px 0 8px; }
.explainer p, .explainer li { color: #2c2820; }
.h-anchor { margin-left: 8px; font-size: .8em; color: var(--rule-hard); text-decoration: none; opacity: 0; transition: opacity .12s; }
.explainer h2:hover .h-anchor { opacity: 1; }
.h-anchor:hover { color: var(--green); }
.explainer strong { color: var(--ink); }

.formula {
  font-family: var(--mono); font-size: .95rem;
  background: var(--paper-deep); border: 1.5px solid var(--rule-hard);
  border-left: 4px solid var(--green);
  border-radius: 3px; padding: 14px 18px; margin: 18px 0; overflow-x: auto;
  white-space: pre; line-height: 1.7;
}
.gotcha {
  border: 1.5px dashed var(--rule-hard); border-radius: 3px;
  padding: 14px 18px; margin: 16px 0; background: rgba(169, 125, 30, .06);
}
.gotcha .g-title { font-family: var(--mono); font-size: .75rem; text-transform: uppercase; letter-spacing: .13em; color: var(--gold); font-weight: 700; margin-bottom: 4px; }
.gotcha p { margin: 4px 0; }

.example {
  background: #fffdf7; border: 1.5px solid var(--rule-hard); border-radius: 3px;
  padding: 16px 20px; margin: 18px 0;
}
.example .e-title { font-family: var(--serif); font-weight: 700; margin-bottom: 8px; }

/* ---------- auth & account ---------- */
.narrow { max-width: 460px; margin: 60px auto 90px; }
.narrow .panel { margin-top: 20px; }
.msg-ok { color: var(--green-bright); font-size: .92rem; }
.msg-err { color: var(--red); font-size: .92rem; }
.otp-input { letter-spacing: .5em; text-align: center; font-size: 1.5rem !important; }

.account-section { margin: 34px 0; }
.save-row { display: flex; gap: 14px; align-items: baseline; padding: 10px 2px; border-bottom: 1px solid var(--rule); font-size: .93rem; }
.save-row .when { font-family: var(--mono); font-size: .78rem; color: var(--ink-soft); white-space: nowrap; }

/* ---------- upload zone ---------- */
.dropzone {
  border: 2px dashed var(--rule-hard); border-radius: 4px;
  padding: 30px; text-align: center; color: var(--ink-soft);
  background: var(--paper-deep); cursor: pointer; transition: border-color .15s;
}
.dropzone:hover, .dropzone.drag { border-color: var(--green); color: var(--green); }
.locked-note { font-size: .9rem; color: var(--ink-soft); }
.locked-note a { font-weight: 700; }

/* ---------- footer ---------- */
footer.colophon {
  border-top: 3px double var(--rule-hard); margin-top: 60px;
  padding: 26px 0 44px; color: var(--ink-soft); font-size: .85rem;
}
footer .wrap { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
footer a { color: var(--ink-soft); }

@media (max-width: 640px) {
  .calc-row { grid-template-columns: 70px 1fr; }
  .calc-row .soon-tag, .calc-row .go-arrow { display: none; }
  .masthead nav { margin-left: 0; }
  .panel { padding: 18px 16px; }
}