:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #182033;
  --muted: #697386;
  --line: #dde5ef;
  --primary: #1267d8;
  --primary-dark: #0c4ea8;
  --danger: #c5342a;
  --success: #12825a;
  --warning: #986100;
  --radius: 8px;
  --shadow: 0 10px 24px rgba(24, 32, 51, 0.08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  letter-spacing: 0;
}
a { color: inherit; text-decoration: none; }
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 254px;
  padding: 18px;
  background: #111827;
  color: #edf3ff;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 8px 6px 16px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.brand img { width: 42px; height: 42px; }
.brand small { display: block; color: #a8b3c7; margin-top: 2px; }
nav { display: grid; gap: 5px; }
nav p {
  color: #8fa0bb;
  text-transform: uppercase;
  font-size: 11px;
  font-weight: 800;
  margin: 12px 8px 4px;
}
nav a, .ghost {
  border: 0;
  border-radius: var(--radius);
  padding: 11px 12px;
  background: transparent;
  color: #dce6f7;
  font: inherit;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}
nav a.active, nav a:hover, .ghost:hover { background: #243248; color: #fff; }
.sidebar form { margin-top: auto; }
.ghost { width: 100%; }
.main { margin-left: 254px; padding: 24px; }
.login-main {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}
.login-card, .panel, .stats article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.login-card { width: min(420px, 100%); padding: 28px; }
.login-logo { width: 64px; height: 64px; }
.login-card h1 { margin: 14px 0 22px; }
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}
h1, h2, p { margin-top: 0; }
h1 { font-size: 26px; margin-bottom: 4px; }
h2 { font-size: 18px; margin-bottom: 16px; }
p { color: var(--muted); }
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}
.stats article { padding: 18px; }
.stats span { color: var(--muted); display: block; margin-bottom: 8px; }
.stats strong { font-size: 30px; }
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.panel { padding: 18px; margin-bottom: 18px; }
.money { font-size: 28px; font-weight: 900; margin-bottom: 14px; }
label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-weight: 800;
}
input, select {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 10px;
  background: #fff;
  color: var(--text);
  font: inherit;
}
button, .button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 12px;
  background: #fff;
  color: var(--text);
  font: inherit;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  cursor: pointer;
}
.primary { border-color: var(--primary); background: var(--primary); color: #fff; }
.primary:hover { background: var(--primary-dark); }
.danger { color: var(--danger); border-color: #f2c7c2; }
.grid-form {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.wide { grid-column: span 2; }
.form-actions { display: flex; gap: 10px; align-items: end; }
.search { display: flex; gap: 8px; width: min(430px, 100%); }
.tabs { display: flex; gap: 8px; }
.tabs a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  font-weight: 800;
}
.tabs a.active { color: #fff; background: var(--primary); border-color: var(--primary); }
.table-wrap { overflow-x: auto; }
table { width: 100%; min-width: 860px; border-collapse: collapse; }
th, td { padding: 11px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; }
td small { display: block; color: var(--muted); margin-top: 3px; }
.actions { display: flex; gap: 8px; justify-content: flex-end; }
.actions form { margin: 0; }
.badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 12px;
  font-weight: 900;
}
.badge.active, .badge.paid { color: var(--success); background: #e5f7ef; }
.badge.isolated, .badge.unpaid { color: var(--warning); background: #fff2d8; }
.badge.inactive, .badge.cancelled { color: var(--danger); background: #fff1ef; }
.alert {
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 14px;
  font-weight: 800;
}
.alert.ok { color: var(--success); background: #e5f7ef; }
.alert.error { color: var(--danger); background: #fff1ef; }
@media (max-width: 980px) {
  .sidebar { position: static; width: 100%; }
  .main { margin-left: 0; padding: 16px; }
  .stats, .split, .grid-form { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .topbar, .search { align-items: stretch; flex-direction: column; }
  .stats, .split, .grid-form { grid-template-columns: 1fr; }
  .wide { grid-column: auto; }
  .actions { flex-wrap: wrap; justify-content: flex-start; }
  h1 { font-size: 23px; }
}