/* Email Fast — "Ledger" design system.
   Certificate/notary aesthetics: paper + ink, seal-teal accent, hairline rules,
   double-rule evidence panels, tear-lines, guilloché band. Light + dark (blueprint).
   ~Zero JS; everything here must work with CSS alone. */

/* ---------- tokens ---------- */
:root {
  --paper: #faf8f2;
  --paper-2: #f3efe4;
  --ink: #1c1d19;
  --ink-soft: #4c4e46;
  --rule: #ddd7c8;
  --rule-strong: #b9b29e;
  --seal: #0e6b60;
  --seal-ink: #0a544c;
  --seal-wash: #e3efec;
  --code-bg: #14201d;
  --code-ink: #dfeae6;
  --ok: #2e7d4f;
  --warn: #a06b12;
  --err: #a3352c;
  --shadow: 0 1px 0 rgba(28, 29, 25, 0.06);
  --guilloche: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='24' viewBox='0 0 240 24'%3E%3Cg fill='none' stroke='%230e6b60' stroke-width='0.7' opacity='0.5'%3E%3Cpath d='M0 12 C 20 2, 40 2, 60 12 S 100 22, 120 12 S 160 2, 180 12 S 220 22, 240 12'/%3E%3Cpath d='M0 12 C 20 22, 40 22, 60 12 S 100 2, 120 12 S 160 22, 180 12 S 220 2, 240 12'/%3E%3Cpath d='M0 12 C 30 4, 50 20, 80 12 S 130 4, 160 12 S 210 20, 240 12' opacity='0.6'/%3E%3C/g%3E%3C/svg%3E");
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #10201d;
    --paper-2: #0b1815;
    --ink: #e9e6da;
    --ink-soft: #a9ada1;
    --rule: #24352f;
    --rule-strong: #3a4f47;
    --seal: #3fb5a8;
    --seal-ink: #63c9bd;
    --seal-wash: #12302b;
    --code-bg: #0b1512;
    --code-ink: #d5e5e0;
    --ok: #58b57f;
    --warn: #cf9b3f;
    --err: #d0655c;
    --shadow: none;
    --guilloche: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='24' viewBox='0 0 240 24'%3E%3Cg fill='none' stroke='%233fb5a8' stroke-width='0.7' opacity='0.45'%3E%3Cpath d='M0 12 C 20 2, 40 2, 60 12 S 100 22, 120 12 S 160 2, 180 12 S 220 22, 240 12'/%3E%3Cpath d='M0 12 C 20 22, 40 22, 60 12 S 100 2, 120 12 S 160 22, 180 12 S 220 2, 240 12'/%3E%3Cpath d='M0 12 C 30 4, 50 20, 80 12 S 130 4, 160 12 S 210 20, 240 12' opacity='0.6'/%3E%3C/g%3E%3C/svg%3E");
  }
}

/* ---------- base ---------- */
* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.65 "Seravek", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
code, pre, kbd, .mono {
  font-family: ui-monospace, "Cascadia Code", "SF Mono", Consolas, Menlo, monospace;
}
a { color: var(--seal-ink); text-decoration-color: color-mix(in srgb, var(--seal) 45%, transparent); text-underline-offset: 3px; }
a:hover { color: var(--seal); }
:focus-visible { outline: 2px solid var(--seal); outline-offset: 2px; }
img, svg { max-width: 100%; height: auto; }
.wrap { max-width: 72rem; margin: 0 auto; padding: 0 1.25rem; }
.skip { position: absolute; left: -999px; top: 0; background: var(--seal); color: #fff; padding: 0.5rem 1rem; z-index: 99; }
.skip:focus { left: 0; }

/* ---------- typography ---------- */
h1, h2, h3, h4 { line-height: 1.15; letter-spacing: -0.015em; font-weight: 650; text-wrap: balance; }
h1 { font-size: clamp(2.1rem, 5.2vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); margin: 2.75rem 0 0.9rem; }
h3 { font-size: 1.2rem; margin: 1.9rem 0 0.5rem; }
h4 { font-size: 1rem; margin: 1.4rem 0 0.35rem; }
p { margin: 0.8rem 0; }
.lead { font-size: 1.16rem; color: var(--ink-soft); max-width: 46ch; }
.eyebrow {
  font-size: 0.74rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--seal-ink); margin-bottom: 0.6rem;
}
.stamp { font-size: 0.82rem; color: var(--ink-soft); }
.prose { max-width: 46rem; }
.prose ul, .prose ol { padding-left: 1.4rem; margin: 0.8rem 0; }
.prose li { margin: 0.3rem 0; }
.prose blockquote { border-left: 2px solid var(--seal); padding: 0.1rem 0 0.1rem 1rem; color: var(--ink-soft); margin: 1rem 0; }
hr.tear { border: 0; border-top: 1.5px dashed var(--rule-strong); margin: 2.5rem 0; }

/* ---------- header ---------- */
.site-head { border-bottom: 1px solid var(--rule); background: var(--paper); position: sticky; top: 0; z-index: 20; }
.head-row { display: flex; align-items: center; gap: 1.5rem; min-height: 3.6rem; }
.brand { display: inline-flex; align-items: center; gap: 0.5rem; color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: -0.01em; }
.brand .seal { color: var(--seal); }
.brand-name { font-size: 1.05rem; white-space: nowrap; }
.nav-desktop { display: flex; gap: 1.1rem; margin-left: auto; }
.nav-desktop a { color: var(--ink-soft); text-decoration: none; font-size: 0.95rem; padding: 0.35rem 0; }
.nav-desktop a:hover { color: var(--seal-ink); }
.head-cta { white-space: nowrap; }
.mnav { display: none; margin-left: auto; position: relative; }
.mnav summary { list-style: none; cursor: pointer; display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 600; padding: 0.4rem 0.2rem; }
.mnav summary::-webkit-details-marker { display: none; }
.mnav-bars { display: inline-block; width: 18px; height: 2px; background: var(--ink); position: relative; }
.mnav-bars::before, .mnav-bars::after { content: ""; position: absolute; left: 0; width: 18px; height: 2px; background: var(--ink); }
.mnav-bars::before { top: -6px; } .mnav-bars::after { top: 6px; }
.mnav nav { position: absolute; right: 0; top: 2.4rem; background: var(--paper); border: 1px solid var(--rule-strong); outline: 1px solid var(--rule-strong); outline-offset: 3px; padding: 0.9rem 1.1rem; display: grid; gap: 0.6rem; min-width: 14rem; }
.mnav nav a { text-decoration: none; color: var(--ink); }
@media (max-width: 58rem) {
  .nav-desktop, .head-cta { display: none; }
  .mnav { display: block; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-block; padding: 0.6rem 1.1rem; border: 1px solid var(--rule-strong);
  color: var(--ink); background: transparent; text-decoration: none; font-weight: 600;
  font-size: 0.95rem; border-radius: 2px;
}
.btn:hover { border-color: var(--seal); color: var(--seal-ink); }
.btn-primary { background: var(--seal); border-color: var(--seal); color: #fff; }
.btn-primary:hover { background: var(--seal-ink); border-color: var(--seal-ink); color: #fff; }

/* ---------- announce ---------- */
.announce { background: var(--seal-wash); border-bottom: 1px solid var(--rule); font-size: 0.88rem; padding: 0.5rem 0; color: var(--seal-ink); text-align: center; }
.announce a { font-weight: 600; }

/* ---------- hero ---------- */
.hero { padding: 4rem 0 2.5rem; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr); gap: 3rem; align-items: center; }
.hero-copy h1 { max-width: 12ch; }
.hero-actions { display: flex; gap: 0.8rem; margin-top: 1.5rem; flex-wrap: wrap; }
.hero-code figcaption { font-size: 0.82rem; color: var(--ink-soft); padding: 0.6rem 0.9rem 0.8rem; }
@media (max-width: 58rem) { .hero-grid { grid-template-columns: 1fr; gap: 2rem; } .hero { padding: 2.5rem 0 1.5rem; } }

/* ---------- proof strip ---------- */
.proof-strip {
  border-top: 1.5px dashed var(--rule-strong); border-bottom: 1.5px dashed var(--rule-strong);
  padding: 0.8rem 0; background: var(--paper-2);
  font-variant-numeric: tabular-nums; font-size: 0.9rem; color: var(--ink-soft);
}
.proof-strip .wrap { display: flex; flex-wrap: wrap; gap: 0.6rem 0.9rem; justify-content: center; }
.proof-dot { color: var(--rule-strong); }

/* ---------- doors ---------- */
.doors { padding: 3rem 0 1rem; }
.doors-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.25rem; }
.door-card {
  display: block; padding: 1.4rem 1.4rem 1.2rem; text-decoration: none; color: var(--ink);
  border: 1px solid var(--rule-strong); border-radius: 2px; background: var(--paper);
  box-shadow: var(--shadow); transition: border-color 120ms ease;
}
.door-card:hover { border-color: var(--seal); }
.door-card h2 { margin: 0 0 0.4rem; font-size: 1.2rem; }
.door-card p { color: var(--ink-soft); font-size: 0.95rem; }
.door-link { color: var(--seal-ink); font-weight: 600; font-size: 0.92rem; }
@media (max-width: 58rem) { .doors-grid { grid-template-columns: 1fr; } }

/* ---------- evidence panels (the certificate frame) ---------- */
.panel {
  border: 1px solid var(--rule-strong); outline: 1px solid var(--rule-strong);
  outline-offset: 3px; border-radius: 2px; background: var(--paper);
  padding: 0; margin: 1.6rem 3px; overflow: hidden;
}
.panel-title {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--seal-ink); padding: 0.55rem 0.9rem; border-bottom: 1px solid var(--rule);
  background: var(--seal-wash);
}
.panel > p, .panel > ul, .panel > ol, .panel > .table-wrap { margin: 0.8rem 0.9rem; }
.panel-tradeoffs .panel-title { color: var(--warn); background: transparent; }
.panel .code { margin: 0; border: 0; outline: 0; }

/* ---------- code ---------- */
.code {
  background: var(--code-bg); color: var(--code-ink); border-radius: 2px;
  margin: 1.2rem 0; overflow-x: auto;
}
.code pre { padding: 1rem 1.1rem; font-size: 0.86rem; line-height: 1.55; }
.prose :not(pre) > code, td code, li code, p code {
  background: var(--paper-2); border: 1px solid var(--rule); border-radius: 2px;
  padding: 0.08em 0.35em; font-size: 0.88em; color: var(--ink);
}

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; margin: 1.2rem 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.93rem; font-variant-numeric: tabular-nums; }
th { text-align: left; font-size: 0.78rem; letter-spacing: 0.07em; text-transform: uppercase; color: var(--ink-soft); }
th, td { padding: 0.55rem 0.75rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
tbody tr:hover { background: var(--paper-2); }

/* ---------- faq ---------- */
.faq { margin: 3rem 0 1rem; }
.faq-item { border-top: 1px solid var(--rule); }
.faq-item:last-child { border-bottom: 1px solid var(--rule); }
.faq-item summary { cursor: pointer; font-weight: 600; padding: 0.9rem 0.2rem; list-style: none; position: relative; padding-right: 2rem; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 0.4rem; color: var(--seal); font-weight: 700; }
.faq-item[open] summary::after { content: "–"; }
.faq-a { padding: 0 0.2rem 1rem; color: var(--ink-soft); }

/* ---------- CTA band ---------- */
.cta-band { border-top: 1px solid var(--rule); background: var(--paper-2); margin-top: 3.5rem; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding: 2.2rem 1.25rem; flex-wrap: wrap; }
.cta-inner h2 { margin: 0 0 0.3rem; }
.cta-inner p { color: var(--ink-soft); max-width: 52ch; margin: 0; }
.cta-actions { display: flex; gap: 0.8rem; flex-wrap: wrap; }

/* ---------- footer ---------- */
.site-foot { margin-top: 0; border-top: 1px solid var(--rule); background: var(--paper); }
.guilloche { height: 24px; background-image: var(--guilloche); background-repeat: repeat-x; opacity: 0.9; }
.foot-grid { display: grid; grid-template-columns: 1.4fr repeat(4, 1fr); gap: 2rem; padding: 2.5rem 0 1.5rem; }
.foot-col { display: grid; gap: 0.45rem; align-content: start; }
.foot-title { font-size: 0.74rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-soft); margin-bottom: 0.3rem; }
.foot-col a { color: var(--ink-soft); text-decoration: none; font-size: 0.92rem; }
.foot-col a:hover { color: var(--seal-ink); }
.foot-tag { font-size: 0.95rem; font-weight: 600; }
.foot-machine { font-size: 0.82rem; color: var(--ink-soft); max-width: 30ch; }
.foot-legal { display: flex; flex-wrap: wrap; gap: 0.4rem 1.2rem; padding: 1.1rem 0 2rem; border-top: 1px solid var(--rule); font-size: 0.82rem; color: var(--ink-soft); }
.foot-legal a { color: var(--ink-soft); }
@media (max-width: 58rem) { .foot-grid { grid-template-columns: 1fr 1fr; } }

/* ---------- page scaffold ---------- */
.page-pad { padding: 3rem 0 1rem; }
main { min-height: 55vh; }