:root {
  --ink: #14213d;
  --text: #1f2937;
  --muted: #5b6475;
  --line: #e3e7ee;
  --bg: #ffffff;
  --soft: #f4f6fa;
  --chung: #2f6fde;
  --hong: #e0393e;
  --link: #1f5fc9;
  --radius: 12px;
  --wrap: 1040px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e9eef7;
    --text: #d7dde8;
    --muted: #9aa4b5;
    --line: #2a3346;
    --bg: #0f1522;
    --soft: #172033;
    --link: #7fa8f5;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--link); }
img { max-width: 100%; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; }

/* Header */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; padding-top: 14px; padding-bottom: 14px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--ink); text-decoration: none; font-weight: 700; font-size: 20px;
}
.brand img { width: 34px; height: 34px; }
.nav { display: flex; gap: 6px; flex-wrap: wrap; }
.nav a {
  color: var(--muted); text-decoration: none; font-size: 15px; font-weight: 600;
  padding: 6px 10px; border-radius: 8px;
}
.nav a:hover { color: var(--ink); background: var(--soft); }
.nav a[aria-current="page"] { color: var(--ink); background: var(--soft); }

/* Hero */
.hero { padding: 64px 0 48px; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 10px;
}
.hero h1 { font-size: clamp(34px, 6vw, 54px); line-height: 1.1; margin: 0 0 18px; color: var(--ink); }
.hero p.lead { font-size: 20px; color: var(--muted); max-width: 680px; margin: 0 0 28px; }
.chung { color: var(--chung); }
.hong { color: var(--hong); }

.buttons { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 12px 20px; border-radius: 10px; font-weight: 700;
  text-decoration: none; font-size: 16px; border: 2px solid var(--ink);
}
.btn.primary { background: var(--ink); color: var(--bg); }
.btn.ghost { color: var(--ink); }

/* Sections */
section { padding: 40px 0; }
section.alt { background: var(--soft); }
h2 { color: var(--ink); font-size: 28px; line-height: 1.25; margin: 0 0 12px; }
h3 { color: var(--ink); font-size: 19px; margin: 0 0 6px; }
.section-intro { color: var(--muted); max-width: 680px; margin: 0 0 28px; }

.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px;
}
section:not(.alt) .card { background: var(--soft); border-color: transparent; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.card .tag {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .05em;
  text-transform: uppercase; padding: 2px 8px; border-radius: 6px; margin-bottom: 10px;
  background: var(--line); color: var(--muted);
}
.card .tag.now { background: #dff3e4; color: #1b6b34; }
@media (prefers-color-scheme: dark) {
  .card .tag.now { background: #173a24; color: #8fe0a8; }
}

.ticks { list-style: none; padding: 0; margin: 0; }
.ticks li { padding-left: 26px; position: relative; margin: 8px 0; }
.ticks li::before {
  content: ""; position: absolute; left: 4px; top: .62em; width: 10px; height: 10px;
  border-radius: 50%; background: var(--chung);
}
.ticks li:nth-child(even)::before { background: var(--hong); }

/* Document pages */
.doc { padding: 48px 0 64px; }
.doc h1 { color: var(--ink); font-size: clamp(30px, 5vw, 42px); line-height: 1.15; margin: 0 0 8px; }
.doc .meta { color: var(--muted); margin: 0 0 32px; }
.doc h2 { font-size: 24px; margin: 40px 0 10px; padding-top: 8px; }
.doc h3 { margin: 24px 0 6px; }
.doc li { margin: 6px 0; }
.doc ol.steps { padding-left: 22px; }
.doc ol.steps > li { margin: 10px 0; }

.toc {
  background: var(--soft); border-radius: var(--radius); padding: 18px 22px; margin: 0 0 8px;
}
.toc strong { color: var(--ink); }
.toc ol { margin: 8px 0 0; padding-left: 22px; }

.note {
  border-left: 4px solid var(--chung); background: var(--soft);
  padding: 14px 18px; border-radius: 0 10px 10px 0; margin: 18px 0;
}
.note.warn { border-left-color: var(--hong); }
.note p { margin: 0; }

table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 16px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--ink); background: var(--soft); }
.table-scroll { overflow-x: auto; }

details {
  border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; margin: 10px 0;
}
details summary { cursor: pointer; font-weight: 700; color: var(--ink); }
details[open] summary { margin-bottom: 8px; }
details p { margin: 6px 0; }

code {
  font-family: ui-monospace, Consolas, "SF Mono", Menlo, monospace; font-size: .9em;
  background: var(--soft); padding: 1px 6px; border-radius: 5px;
}

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 15px; }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer nav { display: flex; gap: 16px; flex-wrap: wrap; }
.site-footer a { color: var(--muted); }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  .hero { padding: 40px 0 32px; }
  .hero p.lead { font-size: 18px; }
  section { padding: 32px 0; }
}