:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --ink: #1a1c1f;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #2563eb;
  --brand-ink: #ffffff;
  --ok: #047857;
  --danger: #b91c1c;
  --flash: #fef3c7;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg); color: var(--ink); line-height: 1.5;
}

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 28px; background: var(--card); border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; color: var(--ink); text-decoration: none; }
.topbar nav a { margin-left: 14px; color: var(--ink); text-decoration: none; }

.container { max-width: 960px; margin: 30px auto; padding: 0 20px; }

h1 { font-size: 1.6rem; margin: 0 0 10px; }
h2 { font-size: 1.15rem; margin: 0 0 12px; }
h3 { font-size: 1rem; margin: 0 0 8px; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 22px; margin: 18px 0;
}
.card.narrow { max-width: 420px; margin: 60px auto; }

form label { display: block; margin: 12px 0 4px; font-size: 0.9rem; color: var(--muted); }
input[type=email], input[type=password], input[type=text] {
  width: 100%; padding: 9px 11px; border: 1px solid var(--line);
  border-radius: 6px; font-size: 0.95rem; background: #fff;
}
button, .btn {
  padding: 8px 14px; border-radius: 6px; border: 1px solid var(--line);
  background: #fff; color: var(--ink); font-size: 0.9rem; cursor: pointer;
  text-decoration: none; display: inline-block; margin-top: 6px;
}
button.primary, .btn.primary { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); }
button.link { background: none; border: none; color: var(--brand); padding: 0; cursor: pointer; }
button.link.danger { color: var(--danger); }
.inline { display: inline; }

.row { display: flex; gap: 16px; flex-wrap: wrap; }
.box { flex: 1 1 280px; border: 1px solid var(--line); border-radius: 8px; padding: 14px; background: #fafbfc; }

.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.ok { color: var(--ok); font-weight: 600; }
.error { background: #fee2e2; color: var(--danger); padding: 10px; border-radius: 6px; margin: 10px 0; }
.flash { background: var(--flash); border: 1px solid #f59e0b; padding: 12px; border-radius: 8px; margin: 14px 0; }

code { background: #f1f5f9; padding: 2px 6px; border-radius: 4px; font-size: 0.88em; }
dl.kv { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; margin: 10px 0; }
dl.kv dt { color: var(--muted); }

table.tbl { width: 100%; border-collapse: collapse; margin-top: 16px; }
table.tbl th, table.tbl td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; }
table.tbl th { background: #fafbfc; font-size: 0.82rem; color: var(--muted); font-weight: 600; }

/* One-click bundle connect buttons (Ads + GA4 + GTM in one grant, etc.) */
.bundle-row { display: flex; flex-direction: column; gap: 10px; margin-bottom: 6px; }
.bundle {
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  padding: 14px 16px; border: 1px solid var(--line); border-radius: 10px;
  background: linear-gradient(180deg, #f8fafc, #ffffff);
}
.bundle-complete { background: linear-gradient(180deg, #ecfdf5, #ffffff); border-color: #a7f3d0; }
.bundle-main { flex: 1; }
.bundle-main h3 { margin: 0 0 2px; }
.bundle-main p { margin: 2px 0; }
.btn-large { padding: 11px 18px; font-size: 0.95rem; white-space: nowrap; }

hr.sep { border: none; border-top: 1px solid var(--line); margin: 22px 0 18px; }
h3.sub { font-size: 0.92rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); margin: 0 0 4px; }