:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --bg-color: #f1f5f9;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --card-bg: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Navbar */
.navbar {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 4px;
    padding: 0.5rem;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-main);
    transition: 0.3s;
}

.navbar-menu {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.navbar-menu a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    transition: color 0.2s;
}

.navbar-menu a:hover {
    color: var(--primary-color);
}

.btn-logout {
    background-color: var(--danger);
    color: white !important;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
}
.btn-logout:hover {
    background-color: #dc2626 !important;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
    min-height: calc(100vh - 180px);
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

select.form-control {
    background-color: white;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    text-decoration: none;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    width: 100%;
}

.btn:active {
    transform: scale(0.98);
}

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

.btn-success {
    background-color: var(--success);
    color: white;
}
.btn-success:hover { background-color: #059669; }

.btn-danger {
    background-color: var(--danger);
    color: white;
}
.btn-danger:hover { background-color: #dc2626; }

.btn-warning {
    background-color: var(--warning);
    color: white;
}
.btn-warning:hover { background-color: #d97706; }

.btn-secondary {
    background-color: var(--border-color);
    color: var(--text-main);
}
.btn-secondary:hover { background-color: #cbd5e1; }

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    width: auto;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

.table th, .table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background-color: var(--secondary-color);
    font-weight: 600;
    color: var(--text-muted);
}

.table tr:hover td {
    background-color: var(--bg-color);
}

/* Badges */
.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
}
.badge-success { background-color: #d1fae5; color: #065f46; }
.badge-danger { background-color: #fee2e2; color: #991b1b; }
.badge-primary { background-color: #dbeafe; color: #1e40af; }
.badge-warning { background-color: #fef3c7; color: #92400e; }

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-weight: 500;
}
.alert-success { background-color: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-danger { background-color: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }

/* Grid Layouts */
.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Utility */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.flex { display: flex; }
.justify-between { justify-content: space-between; }
.items-center { align-items: center; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }

/* Footer */
.footer {
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
    color: var(--text-muted);
}

/* Auth Pages */
.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background-color: var(--bg-color);
}
.auth-card {
    width: 100%;
    max-width: 400px;
    background-color: var(--card-bg);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}
.auth-logo {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
}
.auth-logo svg {
    width: 64px;
    height: 64px;
    margin-bottom: 0.5rem;
}
.auth-logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .navbar-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--card-bg);
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow-md);
        border-top: 1px solid var(--border-color);
    }

    .navbar-menu.active {
        display: flex;
    }

    .navbar-menu li {
        width: 100%;
    }

    .navbar-menu a {
        display: block;
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--bg-color);
    }

    .btn-logout {
        margin-top: 0.5rem;
        text-align: center;
    }

    .grid-cols-2, .grid-cols-3, .grid-cols-4 {
        grid-template-columns: 1fr;
    }

    .table th, .table td {
        padding: 0.75rem;
        font-size: 0.875rem;
    }
    
    .btn-sm {
        width: 100%;
        margin-bottom: 0.5rem;
    }
}