/* Books4One — green accounting working-paper sitting on a desk.
   Solid green header + footer bands; the ruled ledger paper (numbered rows,
   red 3px margin rule, punch holes down the left edge) fills the area between
   them. Monochrome green ink, forest-green "stamped" buttons. Own assets only. */

:root {
  --paper: #ECF4DD;          /* the sheet */
  --paper-2: #F4F9EC;        /* boxes drawn on the sheet */
  --rule: #C6DBB6;           /* soft horizontal ruling */
  --rule-strong: #9CBC8B;    /* box lines */
  --red: #C9302C;            /* the red margin rule */

  --ink: #21402A;            /* body text — dark green */
  --ink-soft: #3C5E44;       /* labels, secondary */
  --ink-faint: #5F7E66;      /* fine print, muted */

  --green: #2E6B38;          /* brand / CTA */
  --green-deep: #1F4E29;
  --green-bright: #3C8C4B;   /* accent / links */
  --band: #1E4A28;           /* header & footer band */
  --band-deep: #163A1F;
  --band-ink: #E9F2DE;       /* text on the band */
  --band-muted: #AEC6A4;
  --border: #2C4A33;         /* sheet edge on the desk */
  --brick: #B14F3D;          /* error text only */

  --desk: #23281E;           /* the desk the sheet sits on */

  --margin-col: 64px;        /* numbered + holes margin */
  --pad-r: clamp(24px, 4.5vw, 80px);
  --band-pad: clamp(20px, 4vw, 52px);
  --gut: 26px;               /* margin rule -> writing */
  --frame: clamp(10px, 1.4vw, 16px); /* thin desk frame around the sheet */

  --sans: "Helvetica Neue", "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, monospace;
  --row: 34px;               /* ruling period (matches script.js) */
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--desk);
  background-image: radial-gradient(130% 90% at 50% -8%, rgba(255,255,255,.045), transparent 60%);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  padding: var(--frame);
}

h1, h2, h3 { margin: 0; font-weight: 800; letter-spacing: -.015em; line-height: 1.06; color: var(--ink); }
p { margin: 0; }
a { color: inherit; text-decoration: none; }

/* ============ the sheet (fills the view, thin desk frame) ============ */
.ledger {
  position: relative;
  max-width: none;
  margin: 0 auto;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;          /* clips the band corners + ruling to the sheet */
  box-shadow: 0 26px 64px -28px rgba(0,0,0,.65), 0 2px 0 rgba(0,0,0,.2);
}

/* ============ ruled paper — the area between header and footer ============ */
.paper { position: relative; padding-top: 6px; }
.paper {
  background-image: repeating-linear-gradient(
    to bottom, transparent 0 calc(var(--row) - 1px), var(--rule) calc(var(--row) - 1px) var(--row));
}
/* the red margin rule */
.paper::before {
  content: ""; position: absolute; top: 0; bottom: 0; left: var(--margin-col);
  width: 3px; background: var(--red); pointer-events: none; z-index: 1;
}
/* punch holes running down the left edge */
.binding {
  position: absolute; top: 0; bottom: 0; left: 0; width: 26px; z-index: 2; pointer-events: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='26' height='74'><defs><radialGradient id='g' cx='50%25' cy='40%25' r='60%25'><stop offset='55%25' stop-color='%2322281E'/><stop offset='100%25' stop-color='%23000000' stop-opacity='0.5'/></radialGradient></defs><circle cx='13' cy='37' r='7.5' fill='url(%23g)' stroke='%23000000' stroke-opacity='0.18'/></svg>");
  background-repeat: repeat-y; background-position: center top;
}
/* numbered margin rail (numbers injected by script.js; lines render without it) */
.rail {
  position: absolute; top: 0; left: 24px; width: calc(var(--margin-col) - 24px);
  pointer-events: none; z-index: 1;
  font-family: var(--mono); font-size: .62rem; color: var(--ink-faint);
}
.rail span { position: absolute; right: 9px; transform: translateY(-50%); letter-spacing: .02em; }

/* ============ layout primitives ============ */
.wrap {
  position: relative; z-index: 3;
  max-width: none; margin: 0;
  padding-left: calc(var(--margin-col) + var(--gut));
  padding-right: var(--pad-r);
}
.section { padding-block: clamp(42px, 6vw, 82px); }
.section--ink, .section--paper { background: transparent; color: var(--ink); }

/* eyebrow */
.eyebrow {
  font-family: var(--mono); font-size: .72rem; text-transform: uppercase;
  letter-spacing: .2em; font-weight: 600; color: var(--green);
  display: inline-flex; align-items: center; gap: .7em; margin: 0 0 20px;
}
.eyebrow::before { content: ""; width: 24px; height: 2px; background: var(--green); display: inline-block; }

.section-head { max-width: 760px; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(1.9rem, 4vw, 3rem); }
.section-head p { margin-top: 18px; font-size: 1.14rem; color: var(--ink-soft); }

/* ============ buttons ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  font-family: var(--sans); font-size: .98rem; font-weight: 700;
  padding: 13px 22px; border-radius: 8px; border: 1.5px solid var(--green-deep);
  cursor: pointer; transition: transform .15s ease, background .15s ease, color .15s ease;
  white-space: nowrap;
}
.btn--primary { background: var(--green); color: #F4F9EC; }
.btn--primary:hover { background: var(--green-deep); transform: translateY(-1px); }
.btn--ghost { background: transparent; color: var(--green); border-color: var(--rule-strong); }
.btn--ghost:hover { border-color: var(--green); transform: translateY(-1px); }
.btn--lg { padding: 16px 28px; font-size: 1.04rem; }
.btn:focus-visible { outline: 3px solid var(--green-bright); outline-offset: 3px; }

/* ============ header band ============ */
.site-head { position: relative; z-index: 4; background: var(--band); color: var(--band-ink); }
.site-head .wrap {
  display: flex; align-items: center; gap: 24px; min-height: 64px;
  padding-left: var(--band-pad); padding-right: var(--band-pad);
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; color: var(--band-ink); }
.brand img { border: 1px solid rgba(255,255,255,.25); border-radius: 5px; background: #fff; }
.brand .mark {
  width: 34px; height: 34px; border-radius: 6px; background: #fff;
  display: grid; place-items: center; color: var(--green-deep);
  font-family: var(--mono); font-weight: 700; font-size: .72rem;
}
.nav { display: flex; gap: 24px; margin-left: auto; }
.nav a { font-size: .95rem; color: var(--band-muted); transition: color .15s ease; }
.nav a:hover { color: #fff; }
.head-cta { display: inline-flex; }
.site-head .head-cta { background: var(--green-bright); border-color: rgba(255,255,255,.55); color: #fff; }
.site-head .head-cta:hover { background: #fff; color: var(--green-deep); border-color: #fff; }
.nav-toggle { display: none; }

/* the form-box, pinned top-right just under the header (below the CTA) */
.ledger-box {
  position: absolute; top: 14px; right: var(--band-pad); z-index: 5;
  width: min(468px, 62%); margin: 0;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--rule-strong); border-radius: 4px; overflow: hidden;
  background: rgba(244,249,236,.9);
}
.ledger-box .cell { padding: 7px 11px 9px; border-right: 1px solid var(--rule-strong); }
.ledger-box .cell:last-child { border-right: 0; }
.ledger-box .k { font-family: var(--mono); font-size: .58rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-faint); }
.ledger-box .v { font-family: var(--mono); font-size: .9rem; color: var(--ink); margin-top: 2px; border-bottom: 1px solid var(--rule); min-height: 1.1em; }

/* ============ hero ============ */
.hero { position: relative; }
.hero .wrap { padding-top: 88px; }
.hero-inner { max-width: 860px; }
.hero h1 { font-size: clamp(2.8rem, 8.5vw, 5.6rem); letter-spacing: -.03em; line-height: .94; margin: 14px 0 0; }
.hero h1 .accent { color: var(--green-bright); }
.hero .lead { margin-top: 24px; font-size: 1.28rem; line-height: 1.5; color: var(--ink-soft); max-width: 620px; }
.hero .lead strong { color: var(--ink); font-weight: 700; }
.hero-actions { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 14px; }
.hero-note { margin-top: 24px; font-family: var(--mono); font-size: .82rem; letter-spacing: .03em; color: var(--ink-faint); }

.assurances { margin-top: 48px; display: flex; flex-wrap: wrap; gap: 14px; }
.assurance { flex: 1 1 200px; min-width: 0; border: 1px solid var(--rule-strong); border-radius: 8px; padding: 18px 20px; background: var(--paper-2); }
.assurance .k { font-family: var(--mono); font-size: .68rem; letter-spacing: .14em; text-transform: uppercase; color: var(--green); }
.assurance .v { margin-top: 7px; font-size: 1.16rem; font-weight: 800; }
.assurance .s { margin-top: 3px; font-size: .92rem; color: var(--ink-soft); }

/* ============ problem cards ============ */
.grievances { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.griev { background: var(--paper-2); border: 1px solid var(--rule-strong); border-radius: 8px; padding: 24px 26px 26px; position: relative; }
.griev::before { content: ""; position: absolute; left: 0; top: 22px; bottom: 22px; width: 3px; background: var(--green); border-radius: 0 3px 3px 0; opacity: .85; }
.griev h3 { font-size: 1.2rem; font-weight: 800; }
.griev p { margin-top: 9px; color: var(--ink-soft); font-size: 1rem; }

/* ============ structure ============ */
.ledger-cols { display: grid; grid-template-columns: 1.05fr .95fr; gap: 20px; }
.acct { border-radius: 10px; padding: 30px; border: 1px solid var(--rule-strong); background: var(--paper-2); }
.acct--core { border-color: var(--green); box-shadow: inset 0 0 0 1px rgba(46,107,56,.18); }
.acct .tag { font-family: var(--mono); font-size: .68rem; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-faint); }
.acct--core .tag { color: var(--green); }
.acct h3 { margin-top: 10px; font-size: 1.5rem; }
.acct > p { margin-top: 12px; color: var(--ink-soft); font-size: 1.02rem; }
.ledger-list { list-style: none; margin: 20px 0 0; padding: 0; }
.ledger-list li { display: flex; align-items: baseline; gap: 13px; padding: 11px 0; border-top: 1px solid var(--rule); font-size: 1.02rem; color: var(--ink); }
.ledger-list li::before { content: "▸"; color: var(--green); font-size: .8em; flex: none; transform: translateY(-1px); }
.acct--addon .ledger-list li::before { content: "+"; color: var(--ink-faint); font-weight: 700; }
.acct .foot { margin-top: 20px; font-family: var(--mono); font-size: .82rem; color: var(--ink-faint); line-height: 1.6; }

/* ============ why ============ */
.value-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.value { background: var(--paper-2); border: 1px solid var(--rule-strong); border-radius: 8px; padding: 28px; }
.value .ic { width: 36px; height: 36px; color: var(--green); }
.value h3 { margin-top: 16px; font-size: 1.26rem; font-weight: 800; }
.value p { margin-top: 9px; color: var(--ink-soft); }

/* ============ workbench ============ */
.bench { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.bench-list { list-style: none; margin: 28px 0 0; padding: 0; }
.bench-list li { display: flex; gap: 13px; padding: 14px 0; border-top: 1px solid var(--rule); color: var(--ink); font-size: 1.05rem; }
.bench-list li:first-child { border-top: 0; }
.bench-list .chk { flex: none; width: 23px; height: 23px; color: var(--green); margin-top: 2px; }
.flow { display: grid; gap: 14px; }
.flow .book { border: 1px solid var(--rule-strong); border-radius: 10px; padding: 20px 22px; background: var(--paper-2); }
.flow .book .label { font-family: var(--mono); font-size: .68rem; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-faint); }
.flow .book .rows { margin-top: 12px; display: grid; gap: 8px; }
.flow .row { height: 9px; border-radius: 4px; }
.flow .messy .row { background: repeating-linear-gradient(90deg, rgba(95,126,102,.5) 0 16px, rgba(95,126,102,.12) 16px 28px); }
.flow .messy .row:nth-child(2){ width: 88%; } .flow .messy .row:nth-child(3){ width: 72%; }
.flow .clean .row { background: var(--green); opacity: .8; }
.flow .clean .row:nth-child(2){ width: 92%; } .flow .clean .row:nth-child(3){ width: 80%; }
.flow .arrow { justify-self: center; color: var(--green); display: grid; place-items: center; }
.flow .clean { border-color: var(--green); }
.bench-badge { margin-top: 24px; font-family: var(--mono); font-size: .8rem; letter-spacing: .03em; color: var(--ink-faint); }

/* ============ audience ============ */
.audience { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.aud { background: var(--paper-2); border: 1px solid var(--rule-strong); border-radius: 8px; padding: 26px; }
.aud h3 { font-size: 1.2rem; font-weight: 800; }
.aud p { margin-top: 9px; color: var(--ink-soft); }

/* ============ founding ============ */
.ft-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.ft-grid > div > p[style] { color: var(--ink-soft) !important; }
.ft-list { list-style: none; margin: 22px 0 0; padding: 0; }
.ft-list li { display: flex; gap: 13px; padding: 15px 0; border-top: 1px solid var(--rule); }
.ft-list li:first-child { border-top: 0; }
.ft-list .star { flex: none; width: 21px; height: 21px; color: var(--green); margin-top: 3px; }
.ft-list .t { font-weight: 800; color: var(--ink); }
.ft-list .d { color: var(--ink-soft); font-size: .98rem; }
.ft-panel { background: var(--paper-2); border: 1.5px solid var(--green); border-radius: 10px; padding: 30px; }
.ft-panel .tag { font-family: var(--mono); font-size: .68rem; letter-spacing: .14em; text-transform: uppercase; color: var(--green); }
.ft-panel h3 { margin-top: 10px; font-size: 1.44rem; }
.ft-panel p { margin-top: 11px; color: var(--ink-soft); }
.ft-panel .btn { margin-top: 20px; width: 100%; }

/* ============ sign-up ============ */
.signup { max-width: 640px; margin: 0 auto; }
.signup .section-head { margin-inline: auto; text-align: center; }
.form-card { background: var(--paper-2); border: 1px solid var(--rule-strong); border-radius: 12px; padding: clamp(24px, 4vw, 38px); box-shadow: 0 18px 44px -28px rgba(0,0,0,.4); }
.field { margin-bottom: 17px; }
.field label { display: block; font-size: .82rem; font-weight: 700; margin-bottom: 7px; color: var(--ink); }
.field input, .field select { width: 100%; font: inherit; font-size: 1rem; padding: 12px 13px; border: 1px solid var(--rule-strong); border-radius: 8px; background: #fff; color: var(--ink); }
.field input:focus, .field select:focus { outline: none; border-color: var(--green); box-shadow: 0 0 0 3px rgba(46,107,56,.16); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
.form-card .btn { width: 100%; margin-top: 6px; }
.form-note { margin-top: 15px; text-align: center; font-size: .88rem; color: var(--ink-soft); }
.form-status { margin-top: 14px; text-align: center; font-family: var(--mono); font-size: .85rem; min-height: 1.2em; }
.form-status.ok { color: var(--green); } .form-status.err { color: var(--brick); }
.launch-pill { display: inline-flex; align-items: center; gap: .6em; margin: 0 auto 16px; font-family: var(--mono); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--green); border: 1px solid var(--rule-strong); border-radius: 999px; padding: 6px 14px; }

/* ============ footer band (original) ============ */
.site-foot { position: relative; z-index: 4; background: var(--band); color: var(--band-muted); }
.site-foot .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 26px;
  padding-top: 34px; padding-bottom: 36px; padding-left: var(--band-pad); padding-right: var(--band-pad); }
.site-foot .brand { color: #fff; }
.site-foot .brand .mark { background: #fff; color: var(--green-deep); }
.site-foot .f-tag { font-family: var(--mono); font-size: .8rem; color: var(--band-muted); }
.site-foot .f-links { display: flex; gap: 20px; margin-left: auto; }
.site-foot .f-links a { color: var(--band-muted); }
.site-foot .f-links a:hover { color: #fff; }
.site-foot .copy { width: 100%; border-top: 1px solid rgba(255,255,255,.14); padding-top: 18px; font-size: .82rem; color: var(--band-muted); }

/* ============ legal / simple pages ============ */
.doc { max-width: 760px; }
.doc h1 { font-size: clamp(2rem, 5vw, 2.9rem); }
.doc .eyebrow { margin-bottom: 16px; }
.doc h2 { font-size: 1.36rem; margin-top: 34px; }
.doc p, .doc li { color: var(--ink-soft); margin-top: 13px; }
.doc ul { padding-left: 20px; }
.doc a { color: var(--green); text-decoration: underline; }
.back-link { font-family: var(--mono); font-size: .8rem; color: var(--green); }

/* ============ reveal ============ */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ============ responsive ============ */
@media (max-width: 880px) {
  :root { --margin-col: 46px; --gut: 16px; }
  .grievances, .ledger-cols, .value-grid, .audience, .bench, .ft-grid { grid-template-columns: 1fr; }
  .bench, .ft-grid { gap: 32px; }
  .ledger-box { position: static; width: auto; right: auto; top: auto; margin: 16px 0 26px; grid-template-columns: repeat(2, 1fr); }
  .ledger-box .cell:nth-child(2){ border-right: 0; }
  .hero .wrap { padding-top: clamp(14px, 2.5vw, 30px); }
  .nav, .head-cta { display: none; }
  .nav-toggle { display: inline-grid; place-items: center; margin-left: auto; width: 42px; height: 42px;
    border-radius: 8px; cursor: pointer; background: transparent; border: 1px solid rgba(255,255,255,.4); color: #fff; }
  .site-head.open .nav { display: flex; flex-direction: column; gap: 4px; width: 100%; padding-top: 12px; margin-left: 0; }
  .site-head.open .nav a { padding: 8px 0; }
  .form-row { grid-template-columns: 1fr; }
  .binding { width: 20px; }
}
@media (max-width: 560px) {
  :root { --frame: 0px; }
  .ledger { border-radius: 0; border-left: 0; border-right: 0; }
  .hero-actions .btn { width: 100%; }
}