:root {
  --bg: #f7f7f5; --surface: #ffffff; --text: #1c1d1f; --muted: #5f6368; --line: #e3e3df;
  --accent: #2456d6; --accent-ink: #ffffff;
  --bad: #b3261e; --bad-bg: #fce8e6; --warn: #8a5300; --warn-bg: #fdf1dc; --ok: #3c4043; --ok-bg: #eef0f3;
  --radius: 10px; --maxw: 980px;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131416; --surface: #1c1d20; --text: #e8e8e6; --muted: #a1a3a8; --line: #2e3034;
    --accent: #7ea2ff; --accent-ink: #0e1422;
    --bad: #f2b8b5; --bad-bg: #3a1f1d; --warn: #f4c77a; --warn-bg: #3a2c12; --ok: #d0d3d8; --ok-bg: #2a2c30;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); line-height: 1.55; font-size: 16px; }
a { color: var(--accent); }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }

header.site { border-bottom: 1px solid var(--line); background: var(--surface); }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 16px; }
.brand { font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 15px; }
nav a:hover { color: var(--text); }

main { padding: 40px 0 64px; }
h1 { font-size: clamp(28px, 5vw, 40px); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 12px; }
h2 { font-size: 22px; margin: 36px 0 10px; letter-spacing: -0.01em; }
h3 { font-size: 17px; margin: 24px 0 6px; }
.lede { font-size: 18px; color: var(--muted); max-width: 680px; margin: 0 0 28px; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
textarea { width: 100%; min-height: 150px; font: 14px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
  background: var(--bg); color: var(--text); border: 1px solid var(--line); border-radius: 8px; padding: 12px; resize: vertical; }
.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 12px; }
button, .btn { font: inherit; font-weight: 600; border: 0; border-radius: 8px; padding: 10px 18px; cursor: pointer;
  background: var(--accent); color: var(--accent-ink); text-decoration: none; display: inline-block; }
button.secondary, .btn.secondary { background: transparent; color: var(--text); border: 1px solid var(--line); }
button:disabled { opacity: .5; cursor: default; }
.small { font-size: 14px; color: var(--muted); }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 12px; margin: 20px 0; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
.stat b { display: block; font-size: 26px; font-variant-numeric: tabular-nums; }
.stat span { color: var(--muted); font-size: 14px; }

.upsell { border-left: 4px solid var(--accent); }
.table-wrap { overflow-x: auto; margin-top: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; white-space: nowrap; }
td.email { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; min-width: 230px; overflow-wrap: anywhere; }
.pill { display: inline-block; padding: 1px 9px; border-radius: 999px; font-size: 13px; font-weight: 600; white-space: nowrap; }
.pill.invalid { color: var(--bad); background: var(--bad-bg); }
.pill.risky { color: var(--warn); background: var(--warn-bg); }
.pill.unconfirmed { color: var(--ok); background: var(--ok-bg); }

.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.prose { max-width: 720px; }
.prose li { margin-bottom: 6px; }
footer.site { border-top: 1px solid var(--line); padding: 24px 0; color: var(--muted); font-size: 14px; }
footer.site a { color: var(--muted); margin-right: 16px; }
[hidden] { display: none !important; }
@media (max-width: 560px) { nav a { margin-left: 12px; font-size: 14px; } }