:root {
  --navy: #153864;
  --navy-deep: #0e2748;
  --teal: #1497a8;
  --teal-deep: #0c7382;
  --bg: #f4f8fb;
  --bg-raise: #ffffff;
  --ink: #12263c;
  --muted: #4a6074;
  --line: #d5e2ee;
  --card: #ffffff;
  --shadow: 0 4px 14px rgba(21, 56, 100, 0.06);
  --ok: #0d7a45;
  --ok-bg: #e5f6ee;
  --warn: #8a4b08;
  --warn-bg: #fff4df;
  --danger: #9f1239;
  --danger-bg: #fde8ee;
  --info-bg: #e7f6f8;
  --badge-muted-bg: #e8eef5;
  --badge-muted-ink: #3d5168;
  --input: #ffffff;
  --pre: #f3f7fb;
  --radius: 10px;
  --s-1: 0.15rem;
  --s-2: 0.3rem;
  --s-3: 0.45rem;
  --s-4: 0.65rem;
  --s-5: 0.9rem;
  --s-6: 1.15rem;
  --s-7: 1.75rem;
  --font: "Segoe UI", Inter, "Helvetica Neue", Arial, system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --navy: #8eb4dc;
    --navy-deep: #071525;
    --teal: #5ec8d6;
    --teal-deep: #8fdbe4;
    --bg: #0c1726;
    --bg-raise: #132338;
    --ink: #e7eef6;
    --muted: #b4c5d6;
    --line: #27425d;
    --card: #132338;
    --shadow: 0 12px 32px rgba(0, 0, 0, 0.28);
    --ok: #8ee0b5;
    --ok-bg: #123528;
    --warn: #f3c27a;
    --warn-bg: #3a2c12;
    --danger: #ffb3c4;
    --danger-bg: #4a1a28;
    --info-bg: #12343b;
    --badge-muted-bg: #1c3048;
    --badge-muted-ink: #d5e2ee;
    --input: #0e1c2e;
    --pre: #0e1c2e;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 15px;
  background:
    radial-gradient(900px 280px at 8% -12%, rgba(20, 151, 168, 0.1), transparent 55%),
    var(--bg);
  color: var(--ink);
  line-height: 1.4;
}
.is-admin { font-size: 14px; }

a { color: var(--teal-deep); }
a:hover { color: var(--navy); }

.skip {
  position: absolute;
  left: var(--s-4);
  top: -3rem;
  background: var(--card);
  color: var(--ink);
  padding: var(--s-2) var(--s-3);
  border-radius: 8px;
  z-index: 5;
}
.skip:focus { top: var(--s-2); }

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-3);
  min-height: 52px;
  padding: 0.3rem 1rem;
  background: #153864;
  color: #f4f8fb;
}

.brand-wrap { display: flex; flex-direction: column; gap: 0; }
.brand { display: flex; align-items: center; }
.logo { height: 1.55rem; width: auto; display: block; }
.host { font-size: 0.68rem; line-height: 1.15; color: rgba(255, 255, 255, 0.78); }

.who {
  display: flex;
  gap: var(--s-2);
  align-items: center;
  font-size: 0.85rem;
}

.top button {
  margin: 0;
  background: transparent;
  color: inherit;
  border: 1px solid rgba(255, 255, 255, 0.55);
}

.admin-nav {
  display: flex;
  gap: 0.15rem;
  align-items: center;
  padding: 0.25rem 0.75rem;
  background: var(--bg-raise);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}
.admin-nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 650;
  font-size: 0.86em;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  white-space: nowrap;
}
.admin-nav a[aria-current="page"],
.admin-nav a:hover {
  background: var(--info-bg);
  color: var(--teal-deep);
}
.admin-nav .who { margin-left: auto; color: var(--muted); font-size: 0.85rem; }

main {
  width: min(42rem, calc(100% - 1.5rem));
  margin: 0 auto;
  padding: var(--s-5) 0 var(--s-6);
}
.is-admin main { width: min(78rem, calc(100% - 1.5rem)); }

.page-auth main {
  display: flex;
  justify-content: center;
}
.page-auth::after {
  content: "";
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3.25rem;
  background: center bottom / 100% 100% no-repeat;
  opacity: 0.45;
  pointer-events: none;
}
.auth { width: min(100%, 26rem); }
.auth-mark {
  width: 4.25rem;
  height: 4.25rem;
  display: block;
  margin: 0 auto var(--s-3);
}
.mark-on-dark { display: none; }
@media (prefers-color-scheme: dark) {
  .mark-on-light { display: none; }
  .mark-on-dark { display: block; margin-left: auto; margin-right: auto; }
}

.card, .letter {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: var(--s-5);
}
.card + .card, .stack > * + * { margin-top: var(--s-4); }

h1 { margin: 0 0 var(--s-2); font-size: 1.28rem; letter-spacing: -0.02em; line-height: 1.2; }
h2 { margin: var(--s-4) 0 var(--s-2); font-size: 1rem; line-height: 1.25; }
.is-admin h1 { font-size: 1.15rem; }
.is-admin h2 { font-size: 0.95rem; }
.lede, .hint, .note { color: var(--muted); }
.lede { margin-top: 0; }

label {
  display: block;
  font-weight: 650;
  margin-top: var(--s-3);
  font-size: 0.92em;
}

input, textarea, select {
  width: 100%;
  margin-top: 0.2rem;
  padding: 0.35rem 0.55rem;
  min-height: 2rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  color: var(--ink);
  background: var(--input);
}
textarea { min-height: 5.5rem; resize: vertical; }
input:focus, textarea:focus, select:focus {
  outline: 2px solid var(--teal);
  border-color: var(--teal);
}
input.code {
  font-size: 1.25rem;
  letter-spacing: 0.22em;
  text-align: center;
  font-weight: 650;
}

button, .button {
  display: inline-block;
  margin-top: var(--s-3);
  background: #153864;
  color: #f7fbff;
  border: 0;
  border-radius: 8px;
  padding: 0.35rem 0.7rem;
  min-height: 2rem;
  font: inherit;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
}
button:hover, .button:hover { background: var(--navy-deep); color: #fff; }
button.secondary, .button.secondary {
  background: transparent;
  color: #153864;
  border: 1px solid #153864;
}
button.danger { background: var(--danger); color: #fff; }
@media (prefers-color-scheme: dark) {
  button, .button { background: var(--teal); color: #062028; }
  button:hover, .button:hover { background: var(--teal-deep); color: #062028; }
  button.secondary, .button.secondary {
    background: transparent;
    color: var(--teal);
    border-color: var(--teal);
  }
  button.danger { background: #e11d48; color: #fff; }
  a:hover { color: var(--teal); }
}

.check {
  display: flex;
  gap: var(--s-2);
  align-items: center;
  font-weight: 650;
  margin-top: var(--s-4);
}
.check input { width: 1.1rem; height: 1.1rem; min-height: 0; margin: 0; }
.actions { display: flex; flex-wrap: wrap; gap: var(--s-2); align-items: center; }
.actions button { margin-top: var(--s-4); }

.notice, .error {
  padding: var(--s-2) var(--s-3);
  border-radius: 8px;
  font-size: 0.92em;
}
.notice { background: var(--info-bg); color: var(--ink); }
.error { background: var(--danger-bg); color: var(--danger); font-weight: 650; }

.dash {
  list-style: none;
  margin: var(--s-3) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(13.5rem, 1fr));
  gap: var(--s-2);
}
.dash a {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0.55rem 0.7rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: inherit;
  text-decoration: none;
}
.dash a:hover { border-color: var(--teal); }
.dash-title { font-weight: 700; color: var(--ink); font-size: 0.92rem; }
.dash-copy { color: var(--muted); font-size: 0.78rem; line-height: 1.3; }

.table-wrap { overflow-x: auto; margin-top: var(--s-2); }
table { width: 100%; border-collapse: collapse; font-size: 0.92em; }
th, td {
  text-align: left;
  padding: 0.32rem 0.45rem;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}
th {
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}
tr:last-child td { border-bottom: 0; }
td form { margin: 0; }
td button { margin-top: 0; }

.mail { list-style: none; margin: var(--s-3) 0 0; padding: 0; }
.mail a, .mail li {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "subject status"
    "from when";
  gap: 0.05rem 0.75rem;
  padding: 0.45rem 0;
  border-top: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
}
.subject { grid-area: subject; font-weight: 700; }
.mail .badge { grid-area: status; justify-self: end; }
.from { grid-area: from; }
.when { grid-area: when; justify-self: end; }
.from, .when { color: var(--muted); font-size: 0.85em; }

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: capitalize;
  background: var(--badge-muted-bg);
  color: var(--badge-muted-ink);
  white-space: nowrap;
}
.badge-live, .badge-delivered, .badge-up, .badge-active { background: var(--ok-bg); color: var(--ok); }
.badge-onboarding, .badge-queued, .badge-delivering, .badge-retrying, .badge-unknown {
  background: var(--warn-bg);
  color: var(--warn);
}
.badge-paused, .badge-failed, .badge-down { background: var(--danger-bg); color: var(--danger); }

.empty {
  margin: var(--s-3) 0 0;
  padding: var(--s-4);
  text-align: center;
  color: var(--muted);
  background: var(--pre);
  border-radius: 8px;
}
.empty strong { display: block; color: var(--ink); margin-bottom: var(--s-1); }

.meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: var(--s-3);
  margin: 0;
}
.meta div { margin: 0; }
dt {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}
dd { margin: 0.15rem 0 0; }

pre.body {
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--mono);
  background: var(--pre);
  color: var(--ink);
  padding: var(--s-4);
  border-radius: 12px;
  overflow-x: auto;
}

.stepper {
  list-style: none;
  display: flex;
  gap: 0;
  margin: var(--s-3) 0 var(--s-4);
  padding: 0;
  overflow-x: auto;
}
.stepper li { flex: 1; min-width: 4.5rem; position: relative; }
.stepper a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--s-1);
  text-decoration: none;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 650;
}
.step-index {
  width: 1.4rem;
  height: 1.4rem;
  font-size: 0.75rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 2px solid var(--line);
  background: var(--card);
  position: relative;
  z-index: 1;
}
.stepper li:not(:last-child) .step-index::after {
  content: "";
  position: absolute;
  left: 100%;
  top: 50%;
  width: calc(4.5rem - 0.15rem);
  height: 2px;
  background: var(--line);
  z-index: -1;
}
.stepper .is-done .step-index,
.stepper .is-current .step-index {
  background: #153864;
  border-color: #153864;
  color: #fff;
}
.stepper .is-current a { color: var(--ink); }
@media (prefers-color-scheme: dark) {
  .stepper .is-done .step-index,
  .stepper .is-current .step-index {
    background: var(--teal);
    border-color: var(--teal);
    color: #062028;
  }
}

.tabs { display: flex; flex-wrap: wrap; gap: 0.2rem; margin: 0.35rem 0 0.6rem; }
.tabs a { text-decoration: none; padding: 0.18rem 0.5rem; border-radius: 999px; color: var(--muted); font-weight: 650; }
.tabs a[aria-current="page"] { background: var(--info-bg); color: var(--teal-deep); }
.pager { display: flex; gap: 0.6rem; align-items: center; margin-top: 0.45rem; font-size: 0.85rem; }
.filters { display: flex; flex-wrap: wrap; gap: 0.45rem; align-items: flex-end; }
.filters label { margin-top: 0; flex: 1; min-width: 9rem; }
.filters button { margin-top: 0; }
.chips { display: flex; flex-wrap: wrap; gap: var(--s-2); margin-top: var(--s-3); }
.chips a {
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: var(--info-bg);
  text-decoration: none;
  font-weight: 650;
}

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

@media (max-width: 720px) {
  .top { align-items: center; padding: 0.35rem 0.7rem; min-height: 48px; }
  .logo { height: 1.4rem; }
  .who { font-size: 0.8rem; }
  .admin-nav { padding: 0.2rem 0.45rem; }
  main, .is-admin main { width: min(100% - 1rem, 78rem); padding-top: var(--s-4); }
  input, select, textarea, button, .button { min-height: 2.75rem; }
  .mail a, .mail li {
    grid-template-columns: 1fr;
    grid-template-areas:
      "subject"
      "status"
      "from"
      "when";
  }
  .mail .badge, .when { justify-self: start; }
  button, .button { width: 100%; text-align: center; }
  .top button, td button, .actions button { width: auto; min-height: 2.25rem; }
  .dash { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto; }
}