:root {
    --primary: #4361ee;
    --secondary: #3f37c9;
    --success: #4cc9f0;
    --danger: #f72585;
    --warning: #f8961e;
    --info: #4895ef;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --border: #dee2e6;
    --bg: #f5f7fa;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.07), 0 1px 3px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
}

.wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 40px;
    width: auto;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
}

.header-info {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray);
    font-size: 0.9rem;
}

.header-info i {
    color: var(--primary);
}

/* Main */
.main {
    flex: 1;
    padding: 30px 0;
}

/* Cards */
.card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 25px;
    margin-bottom: 20px;
}

.card-header {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border);
}

.card-header h2,
.card-header h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-header i {
    color: var(--primary);
}

/* Login */
.login-card {
    max-width: 400px;
    margin: 40px auto;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 30px;
}

.login-card h2 {
    text-align: center;
    margin-bottom: 25px;
    color: var(--dark);
    font-size: 1.8rem;
}

.login-form .form-group {
    margin-bottom: 20px;
}

/* Forms */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
    font-size: 0.9rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    background: white;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 15px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 25px;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    background: white;
    color: var(--dark);
    border: 2px solid var(--border);
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

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

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

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

.btn-back {
    background: var(--gray);
    color: white;
    border-color: var(--gray);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

.btn-small {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
}

.btn-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* Navigation */
.nav-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.inline-form {
    display: inline-block;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 25px;
    border: none;
    border-radius: var(--radius);
    background: white;
    color: var(--dark);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.tab-content {
    display: none;
}

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

/* Brand header */
.brand-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border);
}

.brand-header img {
    max-height: 80px;
    max-width: 120px;
    object-fit: contain;
}

.brand-header h2 {
    font-size: 2rem;
    color: var(--primary);
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    margin: 20px 0;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.data-table th {
    background: var(--light);
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--dark);
    border-bottom: 2px solid var(--border);
}

.data-table td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--border);
}

.data-table tbody tr:hover {
    background: var(--light);
}

/* Progress bars */
.progress-bar {
    width: 150px;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--info));
    border-radius: 4px;
    transition: width 0.3s ease;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin: 20px 0;
}

.stat-item {
    background: var(--light);
    padding: 15px;
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
}

.total-stat {
    margin-top: 20px;
    padding: 15px;
    background: var(--light);
    border-radius: var(--radius);
    font-size: 1.2rem;
    text-align: right;
}

/* Collapse sections */
.collapse-section {
    margin-top: 20px;
}

.collapse-btn {
    width: 100%;
    text-align: left;
    padding: 15px;
    background: var(--light);
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    color: var(--dark);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
}

.collapse-btn:hover {
    background: var(--border);
}

.collapse-btn.active {
    background: var(--primary);
    color: white;
    border-radius: var(--radius) var(--radius) 0 0;
}

.collapse-content {
    display: none;
    padding: 20px;
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 var(--radius) var(--radius);
    background: white;
}

.collapse-content.show {
    display: block;
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: var(--radius);
    margin: 20px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-info {
    background: #cfe2ff;
    color: #084298;
    border: 1px solid #9ec5fe;
}

.alert-warning {
    background: #fff3cd;
    color: #664d03;
    border: 1px solid #ffecb5;
}

/* Footer */
.footer {
    background: white;
    padding: 20px 0;
    margin-top: auto;
    box-shadow: 0 -2px 4px rgba(0,0,0,0.05);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    color: var(--gray);
    font-size: 0.9rem;
}

.footer-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-item i {
    color: var(--primary);
}

/* Utilities */
.text-center {
    text-align: center;
}

.mt-4 {
    margin-top: 30px;
}

/* Mobile */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn-group .btn {
        width: 100%;
    }
    
    .brand-header {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .progress-bar {
        width: 100%;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.card {
    animation: fadeIn 0.3s ease;
}