:root {
    --primary: #1a56db;
    --primary-dark: #1442a8;
    --bg: #f4f6f9;
    --card-bg: #ffffff;
    --border: #e2e5ea;
    --text: #1f2430;
    --text-muted: #6b7280;
    --danger: #dc2626;
    --danger-bg: #fef2f2;
    --success: #16a34a;
    --success-bg: #f0fdf4;
    --radius: 10px;
    --sidebar-w: 240px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.auth-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #eef2ff, #f4f6f9);
}

.auth-wrap { width: 100%; max-width: 380px; padding: 20px; }

.auth-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.auth-title { margin: 0 0 4px; font-size: 20px; font-weight: 700; }
.auth-subtitle { margin: 0 0 20px; color: var(--text-muted); font-size: 14px; }

.auth-form label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin: 14px 0 6px;
}

.auth-form input[type="text"],
.auth-form input[type="password"] {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
}

.auth-form input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26,86,219,0.12);
}

.btn {
    display: inline-block;
    border: none;
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-block { width: 100%; margin-top: 18px; }

.alert {
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 6px;
}
.alert-error { background: var(--danger-bg); color: var(--danger); border: 1px solid #fecaca; }
.alert-success { background: var(--success-bg); color: var(--success); border: 1px solid #bbf7d0; }

.admin-shell { display: flex; min-height: 100vh; }

.sidebar {
    width: var(--sidebar-w);
    background: #111827;
    color: #d1d5db;
    padding: 20px 0;
    flex-shrink: 0;
}
.sidebar .brand {
    padding: 0 20px 20px;
    font-weight: 700;
    color: #fff;
    font-size: 16px;
    border-bottom: 1px solid #1f2937;
    margin-bottom: 10px;
}
.sidebar a {
    display: block;
    padding: 10px 20px;
    color: #d1d5db;
    text-decoration: none;
    font-size: 14px;
}
.sidebar a:hover, .sidebar a.active { background: #1f2937; color: #fff; }

.main {
    flex: 1;
    padding: 24px 32px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}
.topbar .user-info { font-size: 13px; color: var(--text-muted); }
.topbar .user-info a { color: var(--danger); text-decoration: none; margin-left: 10px; }

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
}