*, *::before, *::after { box-sizing: border-box; }
:root {
  --bg: #f5f6f8; --card: #ffffff; --text: #14161b; --muted: #5b6270;
  --border: #e2e5eb; --accent: #2456d6; --accent-text: #ffffff;
  --ok: #147d3c; --warn: #9a5b00; --bad: #b3261e; --chip: #eef1f7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101216; --card: #171a20; --text: #e8eaf0; --muted: #9aa2b1;
    --border: #262b34; --accent: #6f96ff; --accent-text: #0b1020;
    --ok: #5dd68f; --warn: #f0b955; --bad: #ff8a80; --chip: #202631;
  }
}
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
header.top {
  border-bottom: 1px solid var(--border); background: var(--card);
  padding: 0.75rem 1.25rem; display: flex; gap: 1rem; align-items: center; flex-wrap: wrap;
}
.brand { font-weight: 700; letter-spacing: -0.01em; }
.brand span { color: var(--muted); font-weight: 500; margin-left: 0.4rem; font-size: 0.85rem; }
nav.tabs { display: flex; gap: 0.25rem; flex-wrap: wrap; margin-left: auto; }
nav.tabs a {
  padding: 0.4rem 0.7rem; border-radius: 8px; color: var(--muted); font-size: 0.9rem;
}
nav.tabs a.active, nav.tabs a:hover { background: var(--chip); color: var(--text); text-decoration: none; }
.user { display: flex; gap: 0.5rem; align-items: center; color: var(--muted); font-size: 0.85rem; }
main { max-width: 1040px; margin: 0 auto; padding: 1.5rem 1.25rem 4rem; }
h1 { font-size: 1.35rem; margin: 0 0 1rem; letter-spacing: -0.01em; }
h2 { font-size: 1rem; margin: 0 0 0.75rem; }
p.muted, .muted { color: var(--muted); }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 1.15rem; margin-bottom: 1rem;
}
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.stat .value { font-size: 1.6rem; font-weight: 650; letter-spacing: -0.02em; }
.stat .label { color: var(--muted); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.table-wrap { overflow-x: auto; }
th, td { text-align: left; padding: 0.55rem 0.5rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; }
tr:last-child td { border-bottom: none; }
.chip {
  display: inline-block; padding: 0.1rem 0.5rem; border-radius: 999px;
  background: var(--chip); font-size: 0.78rem; color: var(--muted);
}
.chip.sent { color: var(--ok); } .chip.failed, .chip.cancelled { color: var(--bad); }
.chip.queued, .chip.sending, .chip.paused { color: var(--warn); }
form.inline { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: end; }
.row-actions form { display: inline; margin-right: 0.4rem; }
label { display: block; font-size: 0.82rem; color: var(--muted); margin-bottom: 0.2rem; }
input[type=text], input[type=email], input[type=password], input[type=url], input[type=number], select, textarea {
  width: 100%; background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 0.5rem 0.6rem; font: inherit;
}
textarea { min-height: 8rem; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.85rem; }
.field { margin-bottom: 0.75rem; }
.row { display: grid; gap: 0.75rem; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
button, .button {
  background: var(--accent); color: var(--accent-text); border: 0; border-radius: 8px;
  padding: 0.5rem 0.9rem; font: inherit; font-weight: 600; cursor: pointer; display: inline-block;
}
button.secondary { background: var(--chip); color: var(--text); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
.notice { border-left: 3px solid var(--ok); background: var(--card); padding: 0.7rem 0.9rem;
  border-radius: 8px; margin-bottom: 1rem; font-size: 0.9rem; }
.notice.error { border-color: var(--bad); }
pre { background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  padding: 0.75rem; overflow: auto; font-size: 0.82rem; }
iframe.preview { width: 100%; height: 560px; border: 1px solid var(--border); border-radius: 10px; background: #fff; }
.login { max-width: 360px; margin: 8vh auto; }
.login .card { padding: 1.5rem; }
.meter { background: var(--chip); border-radius: 999px; height: 8px; overflow: hidden; }
.meter > span { display: block; height: 100%; background: var(--accent); }