:root {
    --primary: #2563eb;
    --dark: #0f172a;
    --gray: #64748b;
    --light: #f8fafc;
    --border: #e2e8f0;
    --sidebar-width: 250px;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; }

body { background: #f1f5f9; color: #334155; }

a { text-decoration: none; }

/* Login */
.login-page {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e293b, #0f172a);
}

.login-card {
    width: 100%;
    max-width: 400px;
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.input-icon { position: relative; }
.input-icon i { position: absolute; left: 15px; top: 15px; color: #94a3b8; }
.input-icon input { padding-left: 45px !important; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 500; }
.form-control { width: 100%; padding: 12px 15px; border: 1px solid #cbd5e1; border-radius: 8px; outline: none; }
.form-control:focus { border-color: var(--primary); }

.btn { display: inline-block; text-align:center; padding: 12px 20px; border-radius: 8px; border: none; font-weight: 600; cursor: pointer; transition: 0.3s; }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: #1d4ed8; color: white; }
.btn-outline { background: transparent; border: 1px solid var(--border); }
.w-100 { width: 100%; }

.text-center { text-align: center; }
.mt-2 { margin-top: 10px; }
.mt-3 { margin-top: 20px; }
.mb-2 { margin-bottom: 10px; }
.mb-3 { margin-bottom: 20px; }
.mb-4 { margin-bottom: 30px; }

.alert-danger { background: #fee2e2; color: #991b1b; padding: 15px; border-radius: 8px; font-size: 14px; }
.alert-success { background: #dcfce7; color: #166534; padding: 15px; border-radius: 8px; font-size: 14px; }

/* Admin Layout */
.admin-wrapper { display: flex; min-height: 100vh; }

.admin-sidebar {
    width: var(--sidebar-width);
    background: white;
    border-right: 1px solid var(--border);
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: 0.3s transform;
}

.sidebar-logo {
    height: 70px;
    display: flex;
    align-items: center;
    padding: 0 20px;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    border-bottom: 1px solid var(--border);
    justify-content: space-between;
}

.close-sidebar { display: none; cursor: pointer; color: var(--dark); }

.sidebar-nav { padding: 20px 0; display: flex; flex-direction: column; gap: 5px; }

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--gray);
    font-weight: 500;
    transition: 0.2s;
}

.sidebar-nav a:hover, .sidebar-nav a.active {
    background: #eff6ff;
    color: var(--primary);
    border-right: 3px solid var(--primary);
}

.logout-btn { color: #ef4444 !important; margin-top: 50px; }

.admin-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
}

.admin-header {
    height: 70px;
    background: white;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
}
.header-left { display: flex; align-items: center; gap: 15px; }
.toggle-btn { background: none; border: none; font-size: 20px; cursor: pointer; display: none; }

.admin-content { padding: 30px; }

.glass-card { background: white; padding: 25px; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.02); border: 1px solid var(--border); }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.stat-card { display: flex; align-items: center; gap: 20px; }
.stat-icon { width: 50px; height: 50px; border-radius: 12px; background: #eff6ff; color: var(--primary); font-size: 24px; display: flex; justify-content: center; align-items: center; }
.stat-info h3 { font-size: 14px; color: var(--gray); font-weight: 500; }
.stat-number { font-size: 24px; font-weight: 700; color: var(--dark); }

tr.unread { background-color: #f8fafc; font-weight: 600; }

/* Responsive */
@media (max-width: 768px) {
    .admin-sidebar { transform: translateX(-100%); }
    .admin-sidebar.active { transform: translateX(0); }
    .close-sidebar { display: block; }
    .admin-main { margin-left: 0; }
    .toggle-btn { display: block; }
    .grid-3 { grid-template-columns: 1fr; }
    .admin-header { padding: 0 15px; }
    .admin-content { padding: 15px; }
}