/* cortexbanking.com. AI-native enterprise operating platform.
   Palette: marine ink (structure) · emerald (interaction) · brass (metal: the mark, ledger figures,
   hairline rules). Cool paper for light sections. Type: Fraunces (display) / Public Sans (body) /
   IBM Plex Mono (figures, the banking-mainframe voice). */

:root {
  --ink: #0b1e33;
  --ink-2: #10263f;
  --ink-3: #0e2137;
  --line: #24405e;
  --line-soft: rgba(140, 163, 186, 0.16);
  --paper: #f2f5f8;
  --paper-2: #e4eaf0;
  --text-on-ink: #dce6ef;
  --muted-on-ink: #8ca3ba;
  --text-on-paper: #22303e;
  --muted-on-paper: #55677a;
  --brass: #c9a557;
  --brass-dark: #a8863c;
  --green: #1ba872;        /* interactive emerald on dark marine */
  --green-deep: #0a7d3f;   /* interactive emerald on paper */
  --credit: #7fb894;
  --debit: #d9a08e;
  --display: "Fraunces", georgia, serif;
  --body: "Public Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --pad: clamp(1.25rem, 4vw, 3.5rem);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: var(--body);
  color: var(--text-on-ink);
  background: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a:focus-visible, button:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; }

.kicker {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 1rem;
}
.kicker.gold { color: var(--brass); }
.em { color: var(--brass); }

/* ── nav ─────────────────────────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 2.5rem;
  padding: 0.95rem var(--pad);
  background: color-mix(in srgb, var(--ink) 82%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.wordmark {
  display: inline-flex; align-items: center; gap: 0.65rem;
  font-family: var(--display); font-weight: 600; letter-spacing: 0.35em;
  font-size: 1.05rem; color: var(--brass); text-decoration: none;
}
.wordmark .mark { width: 1.8rem; height: 1.8rem; flex: 0 0 auto; }
.wordmark.small .mark { width: 1.4rem; height: 1.4rem; }
.nav nav { display: flex; gap: 1.75rem; margin-inline: auto; }
.nav nav a { color: var(--text-on-ink); text-decoration: none; font-size: 0.92rem; }
.nav nav a:hover { color: var(--green); }
.nav-actions { display: flex; gap: 0.75rem; }

.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.62rem 1.2rem; border-radius: 4px;
  font-size: 0.92rem; font-weight: 600; text-decoration: none;
  border: 1px solid transparent; transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.12s ease;
}
.btn:active { transform: translateY(1px); }
.btn.solid { background: var(--paper); color: var(--ink); }
.btn.solid:hover { background: #fff; }
.btn.ghost { border-color: var(--line); color: var(--text-on-ink); }
.btn.ghost:hover { border-color: var(--green); color: var(--green); }
.btn.ghost.light { border-color: rgba(11,30,51,0.2); color: var(--ink); }
.btn.ghost.light:hover { border-color: var(--green-deep); color: var(--green-deep); }
.btn.green { background: var(--green-deep); color: #eafff5; }
.btn.green:hover { background: #23c286; color: #04120b; }

/* ── hero ─────────────────────────────────────────────────────────────────── */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
  padding: clamp(3rem, 8vh, 6rem) var(--pad) clamp(3rem, 7vh, 5rem);
  /* Emerald glow only; the day-book card carries the ruled-ledger motif, so full-bleed
     background rules would clash with its rows and the headline baseline (they never align). */
  background:
    radial-gradient(1200px 520px at 78% -8%, rgba(27, 168, 114, 0.11), transparent 62%);
}
.eyebrow {
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--green); margin-bottom: 1.1rem;
}
.hero h1 {
  font-family: var(--display); font-weight: 600;
  font-size: clamp(2.5rem, 5.6vw, 4.4rem); line-height: 1.05;
  letter-spacing: -0.015em; color: #f5f8fb; margin-bottom: 1.3rem;
}
.lede { max-width: 35rem; font-size: 1.08rem; color: var(--muted-on-ink); margin-bottom: 2rem; }
.cta-row { display: flex; gap: 0.9rem; flex-wrap: wrap; }
.cta-row.center { justify-content: center; }
.hero-tags {
  margin-top: 2rem; display: flex; flex-wrap: wrap; gap: 0.55rem;
  font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.06em; color: var(--muted-on-ink);
}
.hero-tags .sep { color: var(--brass); }

/* the living journal */
.ledger {
  background: var(--ink-2); border: 1px solid var(--line); border-radius: 6px;
  overflow: hidden; box-shadow: 0 30px 70px rgba(2, 8, 16, 0.5);
}
.ledger figcaption {
  display: flex; justify-content: space-between;
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.16em;
  color: var(--brass); padding: 0.8rem 1rem; border-bottom: 1px solid var(--line);
}
.ledger table { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 0.8rem; }
.ledger th, .ledger td { text-align: left; padding: 0.48rem 1rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ledger th { font-weight: 500; font-size: 0.68rem; letter-spacing: 0.12em; color: var(--muted-on-ink); border-bottom: 1px solid var(--line); }
.ledger .num { text-align: right; font-variant-numeric: tabular-nums; }
.ledger td.dr { color: var(--debit); }
.ledger td.cr { color: var(--credit); }
.ledger tbody tr { border-bottom: 1px solid rgba(36, 64, 94, 0.45); }
.ledger tbody tr.posted { animation: post-in 480ms ease-out; }
@keyframes post-in { from { opacity: 0; transform: translateY(-0.4rem); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .ledger tbody tr.posted { animation: none; } }
.ledger tfoot td { border-top: 1px solid var(--brass); color: var(--brass); font-size: 0.72rem; letter-spacing: 0.08em; padding-block: 0.7rem; }

/* ── proof strip ───────────────────────────────────────────────────────────── */
.proof {
  display: flex; flex-wrap: wrap; gap: 0.5rem 2.75rem; justify-content: center;
  padding: 1.35rem var(--pad); border-block: 1px solid var(--line);
  font-family: var(--mono); font-size: 0.84rem; color: var(--muted-on-ink);
}
.proof b { color: var(--text-on-ink); font-weight: 500; }

/* ── section heads ─────────────────────────────────────────────────────────── */
.section-head { max-width: 46rem; margin-bottom: 3rem; }
.section-head h2 { font-family: var(--display); font-weight: 600; font-size: clamp(1.9rem, 3.6vw, 2.8rem); line-height: 1.12; margin-bottom: 0.85rem; letter-spacing: -0.01em; color: #f5f8fb; }
.section-head p { color: var(--muted-on-ink); font-size: 1.04rem; }
.section-head.light h2 { color: var(--text-on-paper); }
.section-head.light p { color: var(--muted-on-paper); }

/* reveal */
[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
[data-reveal].in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { [data-reveal] { opacity: 1; transform: none; transition: none; } }

/* ── the stack (three layers) ─────────────────────────────────────────────── */
.stack { padding: clamp(3.5rem, 9vh, 6.5rem) var(--pad); background: var(--ink); }
.layers { display: grid; gap: 0.8rem; max-width: 62rem; }
.layer { border: 1px solid var(--line); border-radius: 8px; background: linear-gradient(180deg, var(--ink-2), var(--ink-3)); overflow: hidden; }
.layer-label {
  display: flex; align-items: center; gap: 0.7rem;
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--muted-on-ink); padding: 0.7rem 1.1rem; border-bottom: 1px solid var(--line);
}
.layer-label .n { color: var(--brass); font-size: 0.8rem; }
.layer-body { padding: 1.2rem 1.15rem; }
.layer-body.one-lane p { font-family: var(--mono); font-size: 0.86rem; color: var(--text-on-ink); line-height: 1.9; }
.layer.domains .layer-body { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; padding: 0.85rem; }
.lane { border: 1px solid var(--line); border-radius: 6px; padding: 1rem 1.1rem; background: rgba(11,30,51,0.4); }
.lane h4 { font-family: var(--display); font-weight: 600; font-size: 1.05rem; margin-bottom: 0.45rem; color: #f5f8fb; }
.lane.erp h4 { color: var(--green); }
.lane p { font-family: var(--mono); font-size: 0.8rem; color: var(--muted-on-ink); line-height: 1.85; }
.layer.financial { border-color: color-mix(in srgb, var(--brass) 40%, var(--line)); }
.layer.financial .layer-label .n { color: var(--brass); }
.layer.financial .layer-body p { color: var(--brass); }
.stack-foot { max-width: 52rem; margin-top: 2rem; color: var(--muted-on-ink); font-size: 1.02rem; }
.stack-foot em { color: var(--text-on-ink); font-style: normal; font-weight: 600; }

/* ── capability grid (paper) ──────────────────────────────────────────────── */
.caps { background: var(--paper); color: var(--text-on-paper); padding: clamp(3.5rem, 9vh, 6.5rem) var(--pad); }
.cap-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(15.5rem, 1fr)); gap: 1px; background: var(--paper-2); border: 1px solid var(--paper-2); border-radius: 8px; overflow: hidden; }
.cap-grid article { background: var(--paper); padding: 1.6rem 1.5rem; position: relative; }
.cap-grid article::before { content: ""; position: absolute; left: 0; top: 1.6rem; bottom: 1.6rem; width: 2px; background: var(--green-deep); opacity: 0; transition: opacity 0.15s ease; }
.cap-grid article:hover::before { opacity: 1; }
.cap-grid article.erp::before { background: var(--brass); }
.cap-grid h3 { font-family: var(--display); font-weight: 600; font-size: 1.14rem; margin-bottom: 0.5rem; }
.cap-grid p { font-size: 0.93rem; color: var(--muted-on-paper); }
.cap-grid article.erp h3 { color: var(--green-deep); }

/* ── AI section ──────────────────────────────────────────────────────────── */
.ai { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: clamp(2rem, 5vw, 4.5rem); align-items: center; padding: clamp(3.5rem, 9vh, 6.5rem) var(--pad); background: linear-gradient(180deg, var(--ink), var(--ink-3)); }
.ai h2 { font-family: var(--display); font-weight: 600; font-size: clamp(1.9rem, 3.6vw, 2.7rem); color: #f5f8fb; margin-bottom: 0.9rem; letter-spacing: -0.01em; }
.ai .em, .ai em { color: var(--brass); font-style: normal; }
.ai-copy > p { color: var(--muted-on-ink); max-width: 32rem; margin-bottom: 1.6rem; }
.ai-points { list-style: none; display: grid; gap: 1rem; }
.ai-points li { display: flex; gap: 0.75rem; }
.ai-points .tick { color: var(--green); font-weight: 700; flex: none; }
.ai-points b { color: var(--text-on-ink); }
.ai-points div { color: var(--muted-on-ink); font-size: 0.96rem; }

/* code blocks */
.code { background: var(--ink-2); border: 1px solid var(--line); border-radius: 6px; padding: 1.4rem 1.5rem; overflow-x: auto; font-family: var(--mono); font-size: 0.78rem; line-height: 1.8; color: var(--text-on-ink); }
.code .c { color: var(--muted-on-ink); }
.code .g { color: var(--green); }

/* ── editions (paper) ─────────────────────────────────────────────────────── */
.editions { background: var(--paper); color: var(--text-on-paper); padding: clamp(3.5rem, 9vh, 6.5rem) var(--pad); }
.edition-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 1rem; }
.ed { border: 1px solid var(--paper-2); border-radius: 10px; padding: 1.7rem 1.6rem; background: #fff; }
.ed.feature { border-color: var(--green-deep); box-shadow: 0 18px 40px rgba(10, 125, 63, 0.12); }
.ed-tier { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--brass-dark); margin-bottom: 0.7rem; }
.ed.feature .ed-tier { color: var(--green-deep); }
.ed h3 { font-family: var(--display); font-weight: 600; font-size: 1.4rem; margin-bottom: 0.5rem; }
.ed p { font-size: 0.95rem; color: var(--muted-on-paper); }
.ed em { color: var(--green-deep); font-style: normal; font-weight: 600; }
.tenancy { display: flex; align-items: center; gap: 1rem; margin-top: 1.5rem; padding: 1.3rem 1.5rem; border: 1px dashed var(--paper-2); border-radius: 10px; background: color-mix(in srgb, var(--green-deep) 4%, #fff); }
.tenancy .ico { font-size: 1.6rem; color: var(--green-deep); flex: none; }
.tenancy p { font-size: 0.98rem; color: var(--muted-on-paper); }
.tenancy b { color: var(--text-on-paper); }

/* ── developers ──────────────────────────────────────────────────────────── */
.dev { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: clamp(2rem, 5vw, 5rem); align-items: center; padding: clamp(3.5rem, 9vh, 6.5rem) var(--pad); background: var(--ink); }
.dev h2 { font-family: var(--display); font-weight: 600; font-size: clamp(1.9rem, 3.6vw, 2.7rem); color: #f5f8fb; margin-bottom: 0.9rem; letter-spacing: -0.01em; }
.dev-copy > p { color: var(--muted-on-ink); margin-bottom: 1.6rem; max-width: 31rem; }

/* ── CTA band ────────────────────────────────────────────────────────────── */
.cta-band { text-align: center; padding: clamp(3.5rem, 9vh, 6rem) var(--pad); background: linear-gradient(180deg, var(--ink-3), var(--ink)); border-top: 1px solid var(--line); }
.cta-band h2 { font-family: var(--display); font-weight: 600; font-size: clamp(1.9rem, 4vw, 2.9rem); color: #f5f8fb; margin-bottom: 0.8rem; letter-spacing: -0.01em; }
.cta-band p { color: var(--muted-on-ink); margin-bottom: 1.8rem; }

/* ── footer ──────────────────────────────────────────────────────────────── */
footer { border-top: 1px solid var(--line); padding: 2.5rem var(--pad) 2rem; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem; margin-bottom: 2rem; }
.wordmark.small { font-size: 0.9rem; margin-bottom: 0.5rem; }
footer h4 { font-size: 0.76rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted-on-ink); margin-bottom: 0.7rem; }
footer nav a { display: block; color: var(--text-on-ink); text-decoration: none; font-size: 0.92rem; margin-bottom: 0.45rem; }
footer nav a:hover { color: var(--green); }
.muted { color: var(--muted-on-ink); font-size: 0.9rem; }
.legal { font-size: 0.8rem; }

/* ── responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 62rem) {
  .nav { flex-wrap: wrap; gap: 1rem; }
  .nav nav { order: 3; width: 100%; margin-inline: 0; gap: 1.25rem; overflow-x: auto; }
  .nav-actions { margin-left: auto; }
  .hero, .ai, .dev { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 40rem) {
  .layer.domains .layer-body { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr; }
  .ledger th:first-child, .ledger td:first-child { display: none; }
}