:root {
  --bg: #faf6ee;
  --surface: #f1eadc;
  --text: #16130f;
  --muted: #6a6355;
  --line: #e1d8c5;
  --accent: #16130f;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0d14;
    --surface: #17141e;
    --text: #f2eee6;
    --muted: #a8a2b3;
    --line: #2a2533;
    --accent: #f2e8d5;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; overflow-wrap: break-word; }
header { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 32px; }
header a.brand { font-weight: 700; font-size: 20px; letter-spacing: -0.01em; color: var(--text); text-decoration: none; }
nav.lang a { color: var(--muted); text-decoration: none; margin-left: 12px; font-size: 14px; }
nav.lang a:hover { color: var(--text); }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 8px; letter-spacing: -0.015em; }
h2 { font-size: 20px; margin: 32px 0 8px; }
h3 { font-size: 16px; margin: 20px 0 4px; }
p, li { color: var(--text); }
.muted { color: var(--muted); font-size: 14px; }
a { color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1px; }
ul { padding-left: 20px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 8px 0; }
th, td { text-align: left; vertical-align: top; padding: 8px 6px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; }
section.lang-block + section.lang-block { margin-top: 56px; padding-top: 32px; border-top: 1px solid var(--line); }

/* landing */
.hero { padding: 8vh 0 0; }
.hero h1 { font-size: clamp(36px, 10vw, 64px); line-height: 1.04; letter-spacing: -0.03em; font-weight: 700; margin: 0 0 12px; }
.hero .en { font-size: 18px; color: var(--muted); margin: 0 0 40px; }
.features { list-style: none; padding: 0; margin: 0 0 40px; border-top: 1px solid var(--line); }
.features li { padding: 14px 0; border-bottom: 1px solid var(--line); }
.features span { display: block; color: var(--muted); font-size: 14px; }
.soon { display: inline-block; padding: 10px 20px; border-radius: 999px; background: var(--text); color: var(--bg); font-weight: 600; font-size: 15px; }
.soon span { font-weight: 400; opacity: .7; margin-left: 6px; white-space: nowrap; }

/* help */
details { border-bottom: 1px solid var(--line); padding: 12px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 8px 0 0; }

/* footer */
footer { margin-top: 56px; color: var(--muted); font-size: 14px; }
footer .cols { display: grid; gap: 24px; grid-template-columns: 1fr; padding-top: 24px; border-top: 1px solid var(--line); }
footer h4 { margin: 0 0 8px; font-size: 13px; font-weight: 600; color: var(--text); }
footer ul { list-style: none; padding: 0; margin: 0; }
footer li { margin: 0; padding: 4px 0; }
footer li, footer li a { color: var(--muted); }
footer a { text-decoration: none; }
footer a:hover { color: var(--text); text-decoration: underline; }
footer .copy { margin-top: 24px; font-size: 13px; }
@media (min-width: 600px) { footer .cols { grid-template-columns: repeat(3, 1fr); } }