:root {
  --admin-sidebar: #0f172a;
  --admin-accent: #0d9488;
  --admin-bg: #f1f5f9;
  --admin-text: #0f172a;
  --admin-muted: #64748b;
  --admin-border: #e2e8f0;
  --admin-font: "DM Sans", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--admin-font);
  color: var(--admin-text);
  background: var(--admin-bg);
}

a { color: var(--admin-accent); }

.button {
  display: inline-block;
  padding: 0.55rem 1rem;
  background: var(--admin-accent);
  color: #fff !important;
  border: 0;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
}

.button-secondary {
  background: #334155;
}

.button-danger {
  background: #b91c1c;
}

.button-small {
  padding: 0.35rem 0.65rem;
  font-size: 0.85rem;
}

.admin-shell {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}

.admin-sidebar {
  background: var(--admin-sidebar);
  color: #cbd5e1;
  padding: 1.25rem;
}

.admin-brand {
  margin-bottom: 1.5rem;
}

.admin-brand a {
  display: inline-block;
  background: #fff;
  border-radius: 12px;
  padding: 0.5rem 0.75rem;
  line-height: 0;
}

.admin-brand picture,
.admin-brand img {
  display: block;
  width: min(200px, 100%);
  height: auto;
}

.admin-nav {
  display: grid;
  gap: 0.25rem;
}

.admin-nav a {
  color: #e2e8f0;
  text-decoration: none;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
}

.admin-nav a:hover,
.admin-nav a.is-active {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.admin-main {
  padding: 1.5rem 2rem;
}

.admin-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.admin-topbar h1 {
  margin: 0;
  font-size: 1.6rem;
}

.admin-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.admin-card {
  background: #fff;
  border: 1px solid var(--admin-border);
  border-radius: 12px;
  padding: 1rem 1.1rem;
}

.admin-card strong {
  display: block;
  font-size: 1.8rem;
}

.panel {
  background: #fff;
  border: 1px solid var(--admin-border);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  text-align: left;
  padding: 0.65rem 0.5rem;
  border-bottom: 1px solid var(--admin-border);
  vertical-align: top;
}

label {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
  font-weight: 500;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="url"],
textarea,
select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--admin-border);
  border-radius: 8px;
  font: inherit;
}

textarea { min-height: 120px; }

.notice {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}

.notice-success { background: #ecfdf5; color: #065f46; }
.notice-error { background: #fef2f2; color: #991b1b; }

.login-page,
.install-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.login-card,
.install-card {
  width: min(420px, 100%);
  background: #fff;
  border: 1px solid var(--admin-border);
  border-radius: 14px;
  padding: 1.5rem;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
}

.install-logo,
.login-logo {
  width: 180px;
  margin-bottom: 1rem;
}

.login-extra {
  margin: 1rem 0 0;
  text-align: center;
}

.panel h2 {
  margin: 0 0 0.85rem;
  font-size: 1.15rem;
}

.muted { color: var(--admin-muted); font-size: 0.9rem; }
.error { color: #b91c1c; }
.success { color: #047857; }

.row-actions {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

@media (max-width: 900px) {
  .admin-shell { grid-template-columns: 1fr; }
  .admin-sidebar { position: sticky; top: 0; z-index: 5; }
}