/* memvelope.com — neutral, spare, technical-document aesthetic.
 * Deliberately NOT the Virgil paper-and-ink editorial look (see landing/BRAND.md) —
 * this is a standards page, not a product page. System UI stack (no font
 * loading), monospace for code/schema, restrained single accent, plenty of
 * whitespace. No gradients, no glassmorphism, no marketing chrome. */

:root {
  --bg: #ffffff;
  --bg-alt: #f6f7f8;
  --ink: #16181d;
  --ink-soft: #4b515c;
  --ink-faint: #7a828e;
  --line: #e2e5e9;
  --line-strong: #c9cdd3;
  --accent: #2452c9;
  --accent-soft: #eef2fc;
  --code-bg: #0f1116;
  --code-ink: #d7dbe2;
  --radius: 6px;
  --mono: 'SF Mono', ui-monospace, 'Cascadia Code', 'JetBrains Mono', Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --max-w: 760px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

code, pre, .mono { font-family: var(--mono); font-size: 0.92em; }

pre {
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 16px 18px;
  border-radius: var(--radius);
  overflow-x: auto;
  line-height: 1.5;
}

code:not(pre code) {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.1em 0.4em;
}

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

/* ---- header ---- */

header.site-header {
  border-bottom: 1px solid var(--line);
  padding: 20px 0;
}

header.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.wordmark {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.wordmark span {
  color: var(--ink-faint);
  font-weight: 400;
}

nav.site-nav a {
  color: var(--ink-soft);
  margin-left: 20px;
  font-size: 0.94rem;
}

/* ---- hero ---- */

.hero {
  padding: 64px 0 40px;
}

.eyebrow {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.76rem;
  color: var(--ink-faint);
  margin: 0 0 14px;
}

h1 {
  font-size: 2.1rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
}

.lede {
  font-size: 1.1rem;
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0 0 8px;
}

.hero-links {
  margin-top: 24px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 0.94rem;
  font-weight: 500;
  border: 1px solid var(--line-strong);
  color: var(--ink);
}

.btn:hover { border-color: var(--ink); text-decoration: none; }

.btn--primary {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.btn--primary:hover { background: #000; }

/* ---- sections ---- */

section {
  padding: 40px 0;
  border-top: 1px solid var(--line);
}

section h2 {
  font-size: 1.3rem;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}

section .section-sub {
  color: var(--ink-faint);
  font-size: 0.94rem;
  margin: 0 0 24px;
}

/* ---- converter ---- */

.drop-zone {
  border: 2px dashed var(--line-strong);
  border-radius: 10px;
  padding: 40px 24px;
  text-align: center;
  cursor: pointer;
  background: var(--bg-alt);
  transition: border-color 0.12s ease, background 0.12s ease;
}

.drop-zone:hover,
.drop-zone--active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.drop-zone p {
  margin: 0 0 6px;
  color: var(--ink-soft);
}

.drop-zone .drop-zone-title {
  color: var(--ink);
  font-weight: 500;
  font-size: 1.02rem;
}

.drop-zone .drop-zone-hint {
  font-size: 0.86rem;
  color: var(--ink-faint);
}

#file-input { display: none; }

.status {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: var(--radius);
  font-size: 0.92rem;
  display: none;
}

.status:not(:empty) { display: block; }

.status--success {
  background: #edf7ee;
  color: #1e5e28;
  border: 1px solid #c7e6cb;
}

.status--error {
  background: #fdeeee;
  color: #8a2626;
  border: 1px solid #f3c8c8;
}

.privacy-note {
  margin-top: 18px;
  font-size: 0.86rem;
  color: var(--ink-faint);
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

.privacy-note .lock { flex: none; }

/* ---- layers ---- */

.layer {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px 22px;
  margin-bottom: 16px;
}

.layer h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
}

.layer .tag {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.layer p { margin: 8px 0 0; color: var(--ink-soft); font-size: 0.94rem; }

/* ---- footer ---- */

footer.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0 48px;
  color: var(--ink-faint);
  font-size: 0.88rem;
}

footer.site-footer .footer-line {
  margin: 0 0 8px;
}

footer.site-footer a { color: var(--ink-soft); }

@media (max-width: 640px) {
  h1 { font-size: 1.7rem; }
  .hero { padding: 44px 0 28px; }
  header.site-header .wrap { flex-direction: column; align-items: flex-start; gap: 10px; }
  nav.site-nav a { margin-left: 0; margin-right: 16px; }
}