:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --secondary: #10B981;
    --secondary-hover: #059669;
    --dark: #1E293B;
    --light: #F8FAFC;
    --gray: #64748B;
    --gray-light: #E2E8F0;
    --white: #FFFFFF;
    --danger: #EF4444;
    --danger-hover: #DC2626;
    --border-radius: 8px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.6;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--dark);
    margin-bottom: 1rem;
    font-weight: 600;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Layout */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Navbar */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    color: var(--gray);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.btn-logout {
    background-color: #FEE2E2;
    color: var(--danger);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
.btn-logout:hover {
    background-color: #FECACA;
    color: var(--danger-hover);
}

/* Cards */
.card {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    border-bottom: 1px solid var(--gray-light);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.card-title {
    margin-bottom: 0;
    font-size: 1.25rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

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

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--dark);
    background-color: #F8FAFC;
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    color: var(--dark);
    background-color: var(--white);
    border-color: var(--primary);
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(79, 70, 229, 0.25);
}

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 500;
    text-align: center;
    vertical-align: middle;
    user-select: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: var(--border-radius);
    transition: all 0.2s ease-in-out;
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background-color: var(--secondary-hover);
    transform: translateY(-1px);
}

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

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.dashboard-card {
    text-align: center;
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--dark);
    background: linear-gradient(145deg, #ffffff, #f0f0f0);
}

.dashboard-card:hover {
    transform: translateY(-5px);
    color: var(--primary);
}

.dashboard-card h3 {
    margin-bottom: 0.25rem;
    font-size: 1.1rem;
}

.dashboard-card p {
    font-size: 0.85rem;
    color: var(--gray);
}

.dashboard-card i {
    font-size: 2rem;
    color: var(--primary);
}

/* Tabs */
.tabs-header {
    display: flex;
    border-bottom: 1px solid var(--gray-light);
    margin-bottom: 1.5rem;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-weight: 500;
    color: var(--gray);
    font-size: 1rem;
    transition: all 0.2s ease;
}

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

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.page-link {
    display: inline-block;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius);
    color: var(--dark);
    text-decoration: none;
    transition: all 0.2s;
}

.page-link:hover, .page-link.active {
    background-color: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

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

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

th, td {
    padding: 1rem;
    vertical-align: middle;
    border-top: 1px solid var(--gray-light);
    text-align: left;
}

th {
    font-weight: 600;
    background-color: #F1F5F9;
    color: var(--gray);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

tbody tr:hover {
    background-color: #F8FAFC;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.35em 0.65em;
    font-size: 0.75em;
    font-weight: 700;
    line-height: 1;
    color: #fff;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 0.25rem;
}
.badge-primary { background-color: var(--primary); }

/* Alerts */
.alert {
    position: relative;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
}
.alert-danger {
    color: #842029;
    background-color: #f8d7da;
    border-color: #f5c2c7;
}
.alert-success {
    color: #0f5132;
    background-color: #d1e7dd;
    border-color: #badbcc;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }
    .navbar-nav {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
    .card {
        padding: 1rem;
    }
}

/* Dynamic Item Row */
.item-row {
    display: grid;
    grid-template-columns: 2fr 1fr 2fr auto;
    gap: 1rem;
    align-items: end;
    margin-bottom: 1rem;
    padding: 0.75rem;
    background-color: #F8FAFC;
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-light);
}

@media (max-width: 768px) {
    .item-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
}

/* Autocomplete suggestions */
.autocomplete-suggestions {
    position: absolute;
    border: 1px solid var(--gray-light);
    background: #FFF;
    overflow: auto;
    border-radius: var(--border-radius);
    max-height: 200px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
}
.autocomplete-suggestion {
    padding: 0.75rem 1rem;
    cursor: pointer;
}
.autocomplete-suggestion:hover {
    background: #F1F5F9;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
}
.modal-content {
    background-color: var(--white);
    margin: 10% auto;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 600px;
    animation: modalFadeIn 0.3s;
}
@keyframes modalFadeIn {
    from {opacity: 0; transform: translateY(-20px);}
    to {opacity: 1; transform: translateY(0);}
}
.close-modal {
    color: var(--gray);
    float: right;
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
}
.close-modal:hover {
    color: var(--dark);
}