:root {
  --ink: #16181d;
  --muted: #5b616b;
  --line: #e4e6ea;
  --bg: #f7f7f5;
  --card: #ffffff;
  --accent: #d4472e;
  --accent-soft: #fbeae6;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; font-family: var(--sans); color: var(--ink); background: var(--bg);
  line-height: 1.5; -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: var(--mono); font-size: .88em; background: #eceef1; padding: 1px 5px; border-radius: 4px; }

/* header */
header.site { border-bottom: 1px solid var(--line); background: rgba(247,247,245,.9); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 10; }
.bar { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: baseline; gap: 10px; }
.logo { font-weight: 800; letter-spacing: -.02em; font-size: 19px; color: var(--accent); }
.tag { font-family: var(--mono); font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
nav { display: flex; gap: 20px; align-items: center; font-size: 14px; }
nav a { color: var(--ink); }
.ghlink { font-family: var(--mono); font-size: 12.5px; padding: 5px 11px; border: 1px solid var(--line); border-radius: 7px; }

/* hero */
.hero { padding: 72px 0 40px; }
.eyebrow { font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--accent); margin: 0 0 14px; }
h1 { font-size: clamp(30px, 5vw, 46px); line-height: 1.08; letter-spacing: -.025em; margin: 0 0 20px; max-width: 16ch; }
.lede { font-size: 18px; color: #2c2f36; max-width: 62ch; margin: 0 0 24px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips span { font-family: var(--mono); font-size: 12px; color: var(--muted); background: var(--card); border: 1px solid var(--line); padding: 5px 10px; border-radius: 20px; }

/* panels */
.panel { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 34px; margin: 24px 0; }
.panel h2 { font-size: 24px; letter-spacing: -.02em; margin: 0 0 6px; }
.sub { color: var(--muted); max-width: 70ch; margin: 0 0 22px; }
.hint { font-size: 13px; color: var(--muted); margin-top: 16px; }

/* demo */
.demo-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
.record-form label { display: block; font-size: 12px; font-weight: 600; color: var(--muted); margin-bottom: 12px; }
.record-form input, .record-form select {
  width: 100%; margin-top: 4px; padding: 8px 10px; font: inherit; font-size: 14px; font-weight: 400;
  color: var(--ink); border: 1px solid var(--line); border-radius: 8px; background: #fcfcfb;
}
.record-form input:focus, .record-form select:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
fieldset { border: 1px solid var(--line); border-radius: 10px; padding: 16px 16px 4px; margin: 0 0 16px; }
legend { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--accent); padding: 0 6px; }
table.items { width: 100%; border-collapse: collapse; font-size: 13px; }
table.items th { text-align: left; font-size: 10px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); padding: 2px 4px; font-weight: 700; }
table.items td { padding: 3px 4px; }
table.items input, table.items select { margin: 0; padding: 6px 7px; font-size: 13px; }
table.items td:nth-child(3) input, table.items td:nth-child(4) input { text-align: right; }
.del { background: none; border: none; color: var(--muted); cursor: pointer; font-size: 16px; line-height: 1; padding: 4px; }
.del:hover { color: var(--accent); }

button { font: inherit; cursor: pointer; }
.primary { width: 100%; background: var(--accent); color: #fff; border: none; padding: 13px; border-radius: 10px; font-weight: 700; font-size: 15px; margin-top: 4px; }
.primary:hover { background: #b93a24; }
.ghost { background: #fff; border: 1px dashed var(--line); color: var(--muted); padding: 8px 12px; border-radius: 8px; font-size: 13px; margin: 4px 0 8px; }
.ghost:hover { border-color: var(--accent); color: var(--accent); }
.totals { font-family: var(--mono); font-size: 14px; text-align: right; padding: 12px 2px; border-top: 1px solid var(--line); margin-top: 8px; }
.totals .grand { font-weight: 700; color: var(--accent); font-size: 16px; }

.preview { position: sticky; top: 76px; }
.preview-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; font-family: var(--mono); font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.dl { font-family: var(--sans); font-weight: 700; font-size: 13px; text-transform: none; letter-spacing: 0; padding: 6px 12px; background: var(--accent-soft); border-radius: 7px; }
.preview iframe { width: 100%; height: 640px; border: 1px solid var(--line); border-radius: 12px; background: #fff; box-shadow: 0 8px 30px rgba(20,24,33,.08); }

/* schema */
.tables { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; }
.tbl { border: 1px solid var(--line); border-radius: 12px; padding: 16px; background: #fcfcfb; }
.tbl.hub { border-color: var(--accent); background: var(--accent-soft); }
.tbl h3 { margin: 0 0 10px; font-size: 15px; display: flex; align-items: center; gap: 8px; }
.tbl h3 span { font-family: var(--mono); font-size: 9px; text-transform: uppercase; background: var(--accent); color: #fff; padding: 2px 6px; border-radius: 5px; letter-spacing: .05em; }
.tbl ul { margin: 0; padding-left: 16px; font-size: 12.5px; color: #3a3d44; }
.tbl li { margin-bottom: 5px; }
.tbl em { color: var(--muted); font-style: normal; font-family: var(--mono); font-size: 10.5px; }

/* code cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; }
.card { display: block; border: 1px solid var(--line); border-radius: 12px; padding: 20px; background: #fcfcfb; color: var(--ink); transition: transform .12s, border-color .12s; }
.card:hover { transform: translateY(-2px); border-color: var(--accent); text-decoration: none; }
.card h3 { margin: 0 0 8px; font-size: 16px; }
.card p { margin: 0; font-size: 13.5px; color: var(--muted); line-height: 1.55; }

/* footer */
footer.site { border-top: 1px solid var(--line); margin-top: 40px; padding: 32px 0 60px; }
footer.site p { margin: 4px 0; font-size: 13px; color: var(--muted); }

@media (max-width: 780px) {
  .demo-grid { grid-template-columns: 1fr; }
  .preview { position: static; }
  .preview iframe { height: 480px; }
  nav a:not(.ghlink) { display: none; }
}