:root {
  --bg: #FAFAF8; --surface: #FFFFFF; --border: #E2E0DC; --text: #1A1916;
  --muted: #706C64; --danger: #8B1A1A; --danger-bg: #FDF0F0; --ok-bg: #EEF5EE;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #151412; --surface: #1E1D1A; --border: #34322D; --text: #EDEBE6; --muted: #A09C94; --danger: #E08080; --danger-bg: #2A1A1A; --ok-bg: #1A2A1C; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 Georgia, "Times New Roman", serif; }
header { background: #1A1916; color: #FAFAF8; padding: 14px 16px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
header a { color: inherit; text-decoration: none; }
header .brand { font-size: 20px; font-weight: 600; letter-spacing: .03em; }
header nav { display: flex; gap: 18px; font: 12px ui-monospace, Menlo, monospace; letter-spacing: .06em; text-transform: uppercase; }
header nav a { color: rgba(250,250,248,.7); }
header nav a:hover { color: #FAFAF8; }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 30px; font-weight: 500; margin: 0 0 4px; }
h2 { font-size: 20px; font-weight: 600; margin: 32px 0 8px; }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 24px; font-family: ui-monospace, Menlo, monospace; }
a { color: var(--text); }
ul { padding-left: 22px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--surface); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 4px; padding: 24px; max-width: 440px; }
label { display: block; font: 12px ui-monospace, Menlo, monospace; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 14px 0 6px; }
input { width: 100%; padding: 10px 12px; font: inherit; border: 1px solid var(--border); border-radius: 2px; background: var(--bg); color: var(--text); }
button { margin-top: 18px; width: 100%; padding: 11px; font: inherit; font-weight: 600; border: 0; border-radius: 2px; background: var(--text); color: var(--bg); cursor: pointer; }
button.danger { background: var(--danger); color: #fff; }
button:disabled { opacity: .5; cursor: default; }
.msg { margin-top: 14px; padding: 10px 12px; border-radius: 2px; font-size: 14px; display: none; }
.msg.error { display: block; background: var(--danger-bg); color: var(--danger); }
.msg.ok { display: block; background: var(--ok-bg); }
footer { max-width: 760px; margin: 0 auto; padding: 0 16px 40px; font-size: 14px; color: var(--muted); }
footer a { color: var(--muted); margin-right: 14px; }

/* ── GUIDES ── */
.lede { font-size: 18px; color: var(--muted); margin: 0 0 24px; }
.toc { background: var(--surface); border: 1px solid var(--border); border-radius: 4px; padding: 14px 20px; margin: 0 0 28px; }
.toc p { margin: 0 0 6px; font: 12px ui-monospace, Menlo, monospace; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.toc ol { margin: 0; }
h3 { font-size: 17px; margin: 22px 0 4px; }
.tip { border-left: 3px solid var(--text); padding: 4px 0 4px 14px; margin: 18px 0; color: var(--muted); }
.cta { background: #1A1916; color: #FAFAF8; border-radius: 4px; padding: 22px 24px; margin: 36px 0 8px; }
.cta h2 { margin: 0 0 6px; color: #FAFAF8; }
.cta p { margin: 0 0 14px; color: rgba(250,250,248,.75); }
.cta a.button { display: inline-block; background: #FAFAF8; color: #1A1916; padding: 10px 18px; border-radius: 2px; font-weight: 600; text-decoration: none; }
.guide-list { list-style: none; padding: 0; }
.guide-list li { border: 1px solid var(--border); background: var(--surface); border-radius: 4px; padding: 16px 18px; margin: 0 0 12px; }
.guide-list a { font-size: 19px; font-weight: 600; }
.guide-list p { margin: 4px 0 0; color: var(--muted); font-size: 15px; }
.table-wrap { overflow-x: auto; }
.sheet td.blank { width: 34%; border-bottom: 1px solid var(--text); }
.sheet-head { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 24px; margin: 0 0 20px; }
.sheet-head span { border-bottom: 1px solid var(--text); padding-bottom: 2px; }
.no-print { }
@media print {
  header, footer, .no-print, .cta { display: none !important; }
  body { background: #fff; color: #000; font-size: 12px; }
  main { padding: 0; max-width: none; }
  table { font-size: 12px; }
  th, td { padding: 6px 8px; }
  h2 { margin: 14px 0 6px; font-size: 15px; }
}