:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --text: #1c2230;
  --muted: #637089;
  --primary: #0b6bcb;
  --primary-2: #0955a2;
  --danger: #b42318;
  --border: #dce3ef;
  --shadow: 0 12px 26px rgba(26, 34, 54, 0.08);
}

:root[data-theme="dark"] {
  --bg: #10131a;
  --panel: #1a2230;
  --text: #edf2ff;
  --muted: #9fb0d1;
  --primary: #4ba7ff;
  --primary-2: #2f85d6;
  --danger: #ff6b6b;
  --border: #2d3a52;
  --shadow: 0 14px 28px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at 15% 15%, rgba(75, 167, 255, 0.12), transparent 45%),
    radial-gradient(circle at 85% 0%, rgba(11, 107, 203, 0.15), transparent 35%), var(--bg);
  color: var(--text);
  min-height: 100vh;
}

a {
  color: var(--primary);
  text-decoration: none;
}

.shell {
  display: grid;
  grid-template-columns: 250px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 20px;
}

.brand {
  font-weight: 700;
  font-size: 1.3rem;
  margin-bottom: 18px;
}

.nav a {
  display: block;
  margin-bottom: 8px;
  padding: 10px;
  border-radius: 10px;
  color: var(--text);
}

.nav a.active,
.nav a:hover {
  background: rgba(75, 167, 255, 0.16);
}

.main {
  padding: 26px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-bottom: 22px;
}

.card,
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}

.card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.6rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 14px;
}

input,
textarea,
select,
button {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 11px;
  background: var(--panel);
  color: var(--text);
}

textarea {
  min-height: 140px;
  resize: vertical;
}

label {
  display: block;
  margin: 10px 0 6px;
  color: var(--muted);
  font-size: 0.9rem;
}

button {
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  border: none;
}

button:hover {
  background: var(--primary-2);
}

button.danger {
  background: var(--danger);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
}

th,
td {
  text-align: left;
  padding: 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.78rem;
  border: 1px solid var(--border);
  margin: 0 4px 4px 0;
}

.flash {
  padding: 10px 12px;
  border-radius: 10px;
  margin-bottom: 12px;
}

.flash.success {
  background: rgba(37, 167, 88, 0.16);
  border: 1px solid rgba(37, 167, 88, 0.35);
}

.flash.error {
  background: rgba(180, 35, 24, 0.14);
  border: 1px solid rgba(180, 35, 24, 0.35);
}

.inline {
  display: flex;
  gap: 8px;
  align-items: center;
}

.inline button,
.inline select {
  width: auto;
}

.login-wrap {
  max-width: 420px;
  margin: 9vh auto;
}

.small {
  color: var(--muted);
  font-size: 0.88rem;
}

.theme-toggle {
  width: auto;
  padding: 8px 12px;
}

@media (max-width: 900px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
}