:root {
  --bg: #0f1419;
  --surface: #1a222c;
  --surface-2: #243040;
  --text: #e8eef4;
  --muted: #8b9aab;
  --accent: #3d9a7a;
  --accent-2: #2f7a60;
  --warn: #c9852a;
  --danger: #c44b4b;
  --ok: #3d9a7a;
  --border: #2c3a4a;
  --radius: 10px;
  --font: "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(1200px 600px at 10% -10%, #1c2e28 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #1a2433 0%, transparent 50%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

.top {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.brand h1 {
  margin: 0;
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.brand p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  padding: 0.55rem 0.9rem;
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
}

.btn:hover { background: var(--surface-2); }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent-2);
  color: #04140f;
  font-weight: 600;
}

.btn-primary:hover { background: #48b08c; }

.btn-ghost { background: transparent; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
}

.stat .label {
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat .value {
  margin-top: 0.25rem;
  font-size: 1.5rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.tabs {
  display: flex;
  gap: 0.35rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.tab {
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  background: transparent;
  font-size: 0.88rem;
}

.tab.active {
  background: var(--surface-2);
  color: var(--text);
  border-color: #3d5168;
}

.flash {
  margin-bottom: 1rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}

.flash.success { border-color: #2f6b55; background: #14241e; }
.flash.error { border-color: #7a3535; background: #241414; }
.flash.info { border-color: #3a4d63; }

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th, td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

tr:last-child td { border-bottom: none; }

.mono {
  font-family: var(--mono);
  font-size: 0.84rem;
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge.open { background: #1e3a30; color: #7dceb0; }
.badge.overdue { background: #3a2414; color: #e0a45a; }
.badge.paid { background: #1e2a3a; color: #8eb0d0; }

.muted { color: var(--muted); }
.row-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }

.empty {
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--muted);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}

.card ol, .card ul {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
  line-height: 1.55;
}

.card code, .mono-block {
  font-family: var(--mono);
  font-size: 0.85rem;
  background: var(--bg);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: #c5d6e6;
}

.mono-block {
  display: block;
  padding: 0.75rem 1rem;
  margin-top: 0.75rem;
  overflow-x: auto;
}

@media (max-width: 720px) {
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}