:root {
    --primary: #0D6EFD;
    --primary-dark: #0a58ca;
    --secondary: #FFFFFF;
    --success: #198754;
    --dark: #212529;
    --gray: #6c757d;
    --light-gray: #f8f9fa;
    --border-color: #dee2e6;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--light-gray);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Login Page */
.login-page {
    background: linear-gradient(135deg, var(--primary) 0%, #0a58ca 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-card {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    overflow: hidden;
    width: 100%;
    max-width: 420px;
    margin: 20px;
}

.login-header {
    background: var(--primary);
    padding: 30px;
    text-align: center;
    color: #fff;
}

.login-header img {
    max-height: 64px;
    margin-bottom: 12px;
}

.login-header h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
}

.login-body {
    padding: 30px;
}

.login-body .form-label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--dark);
}

.login-body .input-group-text {
    background: var(--light-gray);
    border-right: none;
}

.login-body .form-control {
    border-left: none;
}

.login-body .form-control:focus {
    box-shadow: none;
    border-color: var(--primary);
}

.login-body .input-group:focus-within .input-group-text {
    border-color: var(--primary);
}

.login-body .btn-login {
    background: var(--primary);
    border: none;
    color: #fff;
    padding: 12px;
    font-weight: 600;
    font-size: 1rem;
    border-radius: 8px;
    width: 100%;
    transition: all 0.3s;
}

.login-body .btn-login:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(13,110,253,0.3);
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 260px;
    background: var(--dark);
    z-index: 1000;
    transition: all 0.3s;
    overflow-y: auto;
}

.sidebar-brand {
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-brand img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
}

.sidebar-brand span {
    color: #fff;
    font-weight: 600;
    font-size: 0.95rem;
}

.sidebar .nav-link {
    color: rgba(255,255,255,0.7);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    color: #fff;
    background: rgba(255,255,255,0.05);
    border-left-color: var(--primary);
}

.sidebar .nav-link i {
    width: 20px;
    text-align: center;
    font-size: 1.1rem;
}

.sidebar .nav-link .badge {
    margin-left: auto;
}

/* Main Content */
.main-content {
    margin-left: 260px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.topbar {
    background: #fff;
    padding: 12px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 999;
}

.topbar .hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--dark);
    cursor: pointer;
}

.topbar .user-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

.topbar .user-info span {
    font-size: 0.9rem;
    color: var(--gray);
}

.topbar .user-info .btn-logout {
    padding: 6px 16px;
    font-size: 0.85rem;
    border-radius: 6px;
}

.content-area {
    padding: 24px;
    flex: 1;
}

/* Dashboard Cards */
.stat-card {
    border: none;
    border-radius: 12px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.stat-card .card-body {
    padding: 20px;
}

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 12px;
}

.stat-card .stat-label {
    font-size: 0.85rem;
    color: var(--gray);
    font-weight: 500;
    margin-bottom: 4px;
}

.stat-card .stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0;
}

/* Cards */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.card-header {
    background: #fff;
    border-bottom: 1px solid var(--border-color);
    padding: 16px 20px;
    font-weight: 600;
    border-radius: 12px 12px 0 0 !important;
}

/* Tables */
.table th {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--gray);
    border-top: none;
    white-space: nowrap;
}

.table td {
    vertical-align: middle;
    font-size: 0.9rem;
}

.table-actions .btn {
    padding: 4px 10px;
    font-size: 0.8rem;
}

/* Forms */
.form-control, .form-select {
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 0.9rem;
    border: 1.5px solid var(--border-color);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(13,110,253,0.1);
}

.form-label {
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 6px;
}

/* Buttons */
.btn {
    border-radius: 8px;
    padding: 8px 20px;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

.btn-success {
    background: var(--success);
    border-color: var(--success);
}

/* Badge */
.badge {
    padding: 6px 12px;
    font-weight: 500;
    font-size: 0.8rem;
    border-radius: 20px;
}

/* Alert */
.alert {
    border-radius: 10px;
    border: none;
}

/* Footer */
.footer {
    background: #fff;
    border-top: 1px solid var(--border-color);
    padding: 12px 24px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--gray);
}

/* Mobile Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 999;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        left: -280px;
    }

    .sidebar.show {
        left: 0;
    }

    .sidebar-overlay.show {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .topbar .hamburger {
        display: block;
    }

    .content-area {
        padding: 16px;
    }

    .stat-card .stat-value {
        font-size: 1.5rem;
    }

    .login-card {
        margin: 16px;
    }
}

@media (max-width: 576px) {
    .content-area {
        padding: 12px;
    }

    .table-responsive {
        font-size: 0.85rem;
    }

    .topbar {
        padding: 10px 16px;
    }
}

/* Print */
@media print {
    .sidebar, .topbar, .footer, .no-print {
        display: none !important;
    }
    .main-content {
        margin-left: 0 !important;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--light-gray);
}

::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #aaa;
}

/* Table wrapper */
.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table-wrapper table {
    min-width: 700px;
}