* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f7fb;
    color: #222;
}

a {
    text-decoration: none;
}

/* Login Page */

.login-page {
    min-height: 100vh;
    background: linear-gradient(135deg, #0f172a, #2563eb);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 420px;
}

.login-card {
    background: #ffffff;
    padding: 35px;
    border-radius: 18px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
}

.login-header {
    text-align: center;
    margin-bottom: 25px;
}

.login-header h1 {
    font-size: 28px;
    color: #0f172a;
    margin-bottom: 8px;
}

.login-header p {
    color: #64748b;
    font-size: 15px;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    padding: 12px;
    border-radius: 10px;
    margin-bottom: 18px;
    font-size: 14px;
    text-align: center;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 14px;
    color: #334155;
    margin-bottom: 8px;
    font-weight: 600;
}

.form-group input {
    width: 100%;
    height: 48px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    padding: 0 14px;
    font-size: 15px;
    outline: none;
}

.form-group input:focus {
    border-color: #2563eb;
}

.btn-login {
    width: 100%;
    height: 48px;
    background: #2563eb;
    color: #ffffff;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
}

.btn-login:hover {
    background: #1d4ed8;
}

/* Admin Layout */

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

.sidebar {
    width: 260px;
    background: #0f172a;
    color: #ffffff;
    padding: 24px;
    flex-shrink: 0;
}

.sidebar-logo {
    margin-bottom: 35px;
}

.sidebar-logo h2 {
    font-size: 26px;
    margin-bottom: 5px;
}

.sidebar-logo p {
    color: #94a3b8;
    font-size: 14px;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    margin-bottom: 12px;
}

.sidebar-menu a {
    display: block;
    padding: 13px 15px;
    border-radius: 10px;
    color: #cbd5e1;
    font-size: 15px;
    transition: 0.3s;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background: #2563eb;
    color: #ffffff;
}

.sidebar-menu .logout-link {
    background: #dc2626;
    color: #ffffff;
    margin-top: 20px;
}

.sidebar-menu .logout-link:hover {
    background: #b91c1c;
}

/* Main Content */

.main-content {
    flex: 1;
    padding: 30px;
}

.topbar {
    background: #ffffff;
    border-radius: 16px;
    padding: 22px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
    box-shadow: 0 4px 18px rgba(15, 23, 42, 0.08);
}

.topbar h1 {
    font-size: 28px;
    color: #0f172a;
    margin-bottom: 5px;
}

.topbar p {
    color: #64748b;
}

.topbar-logout {
    background: #dc2626;
    color: #ffffff;
    padding: 11px 18px;
    border-radius: 10px;
    font-weight: 600;
}

.topbar-logout:hover {
    background: #b91c1c;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
    margin-bottom: 28px;
}

.stat-card {
    background: #ffffff;
    padding: 24px;
    border-radius: 16px;
    box-shadow: 0 4px 18px rgba(15, 23, 42, 0.08);
}

.stat-card span {
    color: #64748b;
    font-size: 14px;
}

.stat-card h2 {
    margin: 12px 0;
    font-size: 30px;
    color: #0f172a;
}

.stat-card p {
    color: #64748b;
    font-size: 14px;
}

.dashboard-box {
    background: #ffffff;
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 4px 18px rgba(15, 23, 42, 0.08);
}

.dashboard-box h2 {
    margin-bottom: 18px;
    color: #0f172a;
}

.dashboard-box table {
    width: 100%;
    border-collapse: collapse;
}

.dashboard-box th,
.dashboard-box td {
    text-align: left;
    padding: 14px;
    border-bottom: 1px solid #e2e8f0;
}

.dashboard-box th {
    width: 180px;
    color: #334155;
}

.dashboard-box td {
    color: #64748b;
}

/* Responsive Design */

@media (max-width: 992px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .admin-layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        min-height: auto;
    }

    .sidebar-logo {
        margin-bottom: 20px;
    }

    .sidebar-menu {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .sidebar-menu li {
        margin-bottom: 0;
    }

    .main-content {
        padding: 20px;
    }

    .topbar {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .dashboard-box {
        overflow-x: auto;
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: 25px;
    }

    .sidebar-menu {
        grid-template-columns: 1fr;
    }

    .topbar h1 {
        font-size: 24px;
    }

    .stat-card h2 {
        font-size: 26px;
    }
}