/* Reset và base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

/* Utility classes */
.hidden {
    display: none !important;
}

.screen {
    display: none;
}

.screen.active {
    display: block;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    color: white;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Toast Notification */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    min-width: 300px;
    max-width: 500px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 10000;
    animation: slideIn 0.3s ease;
}

.toast.success {
    border-left: 4px solid #28a745;
}

.toast.error {
    border-left: 4px solid #dc3545;
}

.toast.warning {
    border-left: 4px solid #ffc107;
}

.toast-content {
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.toast-close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #666;
    margin-left: 10px;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Login Screen */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-box {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    padding: 40px;
    width: 100%;
    max-width: 450px;
    animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header i {
    font-size: 60px;
    color: #667eea;
    margin-bottom: 10px;
}

.login-header h1 {
    color: #333;
    margin-bottom: 5px;
    font-size: 28px;
}

.login-header p {
    color: #666;
    font-size: 14px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group label i {
    margin-right: 8px;
    width: 16px;
    text-align: center;
    color: #667eea;
}

.form-group input {
    padding: 12px 16px;
    border: 2px solid #e1e1e1;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.password-input {
    position: relative;
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: #666;
    padding: 4px;
}

.login-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.login-btn:hover {
    transform: translateY(-2px);
}

.login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.login-footer {
    text-align: center;
    margin-top: 20px;
    color: #666;
    font-size: 12px;
}

/* Dashboard Screen */
.header {
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-left h1 {
    color: #333;
    font-size: 24px;
    margin-bottom: 4px;
}

.user-welcome {
    color: #666;
    font-size: 14px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.token-expiry {
    font-size: 12px;
    color: #666;
    background: #f8f9fa;
    padding: 6px 10px;
    border-radius: 4px;
}

.logout-btn {
    background: #dc3545;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    transition: background 0.3s ease;
}

.logout-btn:hover {
    background: #c82333;
}

.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Cards */
.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    overflow: hidden;
}

.card-header {
    background: #f8f9fa;
    padding: 20px;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    color: #333;
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.refresh-btn {
    background: #28a745;
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.3s ease;
}

.refresh-btn:hover {
    background: #218838;
}

.card-content {
    padding: 20px;
}

/* Points Card */
.points-display {
    text-align: center;
    padding: 20px 0;
}

.points-number {
    font-size: 48px;
    font-weight: bold;
    color: #667eea;
    display: block;
}

.points-label {
    font-size: 18px;
    color: #666;
    margin-top: 8px;
}

/* Filters Section */
.filters-section {
    background: #f8f9fa;
    padding: 20px;
    border-bottom: 1px solid #e9ecef;
}

.filter-row {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
}

.filter-row:last-child {
    margin-bottom: 0;
}

.filter-group {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.filter-group label {
    font-weight: 500;
    margin-bottom: 5px;
    color: #555;
}

.filter-group input,
.filter-group select {
    padding: 8px 12px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-size: 14px;
}

.filter-group select[multiple] {
    height: 80px;
}

.filter-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.apply-btn {
    background: #007bff;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    transition: background 0.3s ease;
}

.apply-btn:hover {
    background: #0056b3;
}

.clear-btn {
    background: #6c757d;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    transition: background 0.3s ease;
}

.clear-btn:hover {
    background: #545b62;
}

/* History Results */
.history-summary {
    background: #e7f3ff;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.summary-label {
    font-weight: 500;
    color: #333;
}

.summary-value {
    font-weight: bold;
    color: #007bff;
    font-size: 18px;
}

/* Pagination Controls */
.pagination-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 20px 0;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
}

.page-btn {
    background: #007bff;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 14px;
    transition: background 0.3s ease;
}

.page-btn:hover:not(:disabled) {
    background: #0056b3;
}

.page-btn:disabled {
    background: #6c757d;
    cursor: not-allowed;
    opacity: 0.6;
}

.page-info {
    font-weight: 500;
    color: #333;
}

.page-size-select {
    padding: 6px 10px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 14px;
    background: white;
}

/* History Table */
.history-table-wrapper {
    overflow-x: auto;
    margin-top: 15px;
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border-radius: 8px;
    overflow: hidden;
}

.history-table th,
.history-table td {
    padding: 12px 8px;
    text-align: left;
    border-bottom: 1px solid #e9ecef;
}

.history-table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #495057;
    font-size: 14px;
    white-space: nowrap;
}

.history-table td {
    font-size: 13px;
    color: #212529;
}

.history-table .amount {
    text-align: right;
    font-family: monospace;
    font-weight: 500;
}

.history-table .date {
    white-space: nowrap;
    font-size: 12px;
}

.history-table .reason {
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-table .status {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    white-space: nowrap;
}

.status-approved {
    background: #d4edda;
    color: #155724;
}

.status-pending {
    background: #fff3cd;
    color: #856404;
}

.status-rejected {
    background: #f8d7da;
    color: #721c24;
}

.status-unknown {
    background: #e9ecef;
    color: #6c757d;
}

.history-results {
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.no-data {
    color: #666;
    font-style: italic;
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .header-right {
        flex-direction: column;
        gap: 10px;
    }
    
    .main-content {
        padding: 15px;
    }
    
    .filter-row {
        flex-direction: column;
        gap: 15px;
    }
    
    .filter-actions {
        flex-direction: column;
    }
    
    .points-number {
        font-size: 36px;
    }
    
    .login-box {
        padding: 30px 20px;
    }
    
    /* History table responsive */
    .history-summary {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .pagination-controls {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .history-table {
        font-size: 12px;
    }
    
    .history-table th,
    .history-table td {
        padding: 8px 4px;
    }
    
    .history-table .reason {
        max-width: 120px;
    }
}

@media (max-width: 480px) {
    .toast {
        left: 10px;
        right: 10px;
        min-width: auto;
    }
    
    .points-number {
        font-size: 28px;
    }
    
    .login-header i {
        font-size: 40px;
    }
    
    .login-header h1 {
        font-size: 24px;
    }
}

/* Animation classes */
.fade-in {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.pulse {
    animation: pulse 1s ease-in-out;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}