:root {
    --primary: #2563eb;
    --dark: #0f172a;
    --muted: #64748b;
    --border: #e2e8f0;
    --background: #f8fafc;
    --white: #ffffff;
    --danger: #b91c1c;
    --success: #166534;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: Inter, Arial, Helvetica, sans-serif;
    color: var(--dark);
    background: var(--background);
}

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

.topbar {
    min-height: 64px;
    padding: 0 24px;
    background: var(--dark);
    color: white;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand { color: white; font-size: 20px; font-weight: 700; }
.brand small { display: block; font-size: 11px; opacity: .65; }
.topbar-user { display: flex; gap: 16px; align-items: center; }
.topbar-user a { color: white; }

.admin-layout { display: grid; grid-template-columns: 230px 1fr; min-height: calc(100vh - 64px); }

.sidebar {
    padding: 24px 14px;
    background: white;
    border-right: 1px solid var(--border);
}

.sidebar nav { display: grid; gap: 8px; }
.sidebar a {
    padding: 11px 13px;
    border-radius: 8px;
    color: var(--dark);
}
.sidebar a:hover { background: #eff6ff; color: var(--primary); }

.admin-content { padding: 28px; min-width: 0; }

.page-heading {
    margin-bottom: 22px;
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: flex-start;
}

.page-heading h1 { margin: 0 0 6px; font-size: 30px; }
.page-heading p { margin: 0; color: var(--muted); }

.panel, .stat-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: 0 5px 18px rgba(15, 23, 42, .04);
}

.panel { padding: 24px; }
.panel h2 { margin-top: 0; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin-bottom: 22px;
}

.stat-card { padding: 24px; }
.stat-card strong { display: block; font-size: 34px; margin-bottom: 6px; }
.stat-card span { color: var(--muted); }

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 16px;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
    font-weight: 700;
    font-size: 14px;
}

.button.primary { background: var(--primary); color: white; }
.button.secondary { background: white; color: var(--dark); border-color: var(--border); }
.button.full { width: 100%; }

.form-grid { display: grid; gap: 18px; }
.form-grid.two-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.full-span { grid-column: 1 / -1; }

label { display: grid; gap: 7px; font-weight: 700; font-size: 14px; }

input, select, textarea {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    font: inherit;
    background: white;
}

textarea { resize: vertical; font-family: Consolas, monospace; font-size: 14px; }
input[type="color"] { min-height: 44px; padding: 4px; }

.form-actions { display: flex; justify-content: flex-end; gap: 10px; }
.checkbox-row { display: flex; gap: 24px; }
.checkbox-row label { display: flex; align-items: center; gap: 8px; }
.checkbox-row input { width: auto; }

.table-responsive { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 14px 12px; border-bottom: 1px solid var(--border); text-align: left; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
td small { display: block; color: var(--muted); margin-top: 4px; }
.actions { white-space: nowrap; }
.actions a { margin-right: 10px; }

.badge {
    display: inline-block;
    padding: 5px 9px;
    border-radius: 999px;
    background: #eef2ff;
    color: #3730a3;
    font-size: 12px;
}

.alert { padding: 12px 14px; border-radius: 8px; margin-bottom: 18px; }
.alert-success { background: #dcfce7; color: var(--success); }
.alert-error { background: #fee2e2; color: var(--danger); }

.login-body {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background: linear-gradient(135deg, #e0e7ff, #f8fafc);
}

.login-card {
    width: min(430px, 100%);
    padding: 30px;
    border-radius: 16px;
    background: white;
    box-shadow: 0 20px 50px rgba(15, 23, 42, .12);
}

.install-card { width: min(680px, 100%); }
.login-card h1 { margin: 0 0 5px; }
.login-card > p { margin-top: 0; color: var(--muted); }
.login-card form { display: grid; gap: 16px; }
.muted { color: var(--muted); font-size: 13px; margin-top: 18px !important; }

@media (max-width: 800px) {
    .admin-layout { grid-template-columns: 1fr; }
    .sidebar { border-right: 0; border-bottom: 1px solid var(--border); }
    .sidebar nav { grid-template-columns: repeat(3, 1fr); }
    .admin-content { padding: 20px; }
    .stats-grid { grid-template-columns: 1fr; }
    .form-grid.two-columns { grid-template-columns: 1fr; }
    .page-heading { flex-direction: column; }
}