* {
    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;
}

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

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 20px;
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

header h1 {
    color: #fff;
    font-size: 2.5em;
    font-weight: 700;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-weight: 500;
}

.status-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.status-dot.online {
    background-color: #4CAF50;
}

.status-dot.offline {
    background-color: #f44336;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

/* Filter Section */
.filter-section {
    margin-bottom: 20px;
}

.filter-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 20px 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
}

.filter-card h2 {
    margin-bottom: 15px;
    color: #333;
    font-size: 1.4em;
}

.filter-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.filter-controls label {
    font-size: 1.1em;
    color: #555;
    font-weight: 500;
}

.variation-period {
    padding: 8px 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1.1em;
    background: white;
    color: #333;
    cursor: pointer;
    transition: all 0.3s ease;
}

.variation-period:hover {
    border-color: #4CAF50;
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.2);
}

.variation-period:focus {
    outline: none;
    border-color: #4CAF50;
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

/* Price Section */
.price-section {
    margin-bottom: 30px;
}

.price-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.price-card h2 {
    text-align: center;
    margin-bottom: 25px;
    color: #333;
    font-size: 1.8em;
}

.price-display {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.price-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 20px;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    border-radius: 10px;
    color: white;
    font-weight: 600;
}

.currency {
    font-size: 1.2em;
    font-weight: 700;
}

.price-value {
    font-size: 2em;
    font-weight: 800;
}

.unit {
    font-size: 0.9em;
    opacity: 0.9;
}

.price-change {
    font-size: 1.1em;
    font-weight: 700;
    padding: 6px 12px;
    border-radius: 20px;
    color: white;
    background: #6c757d;
    transition: all 0.3s ease, opacity 0.2s ease, transform 0.2s ease;
    display: inline-block;
    min-width: 80px;
    text-align: center;
}

.price-change.positive {
    background: #4CAF50;
    color: white;
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

.price-change.negative {
    background: #f44336;
    color: white;
    box-shadow: 0 2px 8px rgba(244, 67, 54, 0.3);
}

.price-change.neutral {
    background: #6c757d;
    color: white;
    box-shadow: 0 2px 8px rgba(108, 117, 125, 0.3);
}

.last-updated {
    text-align: center;
    color: #666;
    font-size: 0.9em;
}

/* Chart Section */
.chart-section {
    margin-bottom: 30px;
}

.chart-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px 30px 50px 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    height: 50vh; /* Chart takes 40% of viewport height */
}

#priceChart {
    max-height: calc(40vh - 100px); /* Account for padding and header */
}

/* Chart annotation styles */
.chartjs-tooltip {
    background: rgba(0, 0, 0, 0.8);
    color: white;
    border-radius: 5px;
    padding: 8px;
    font-size: 12px;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.chart-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin-bottom: 20px;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
    color: white;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.stat-label {
    font-size: 0.9em;
    font-weight: 500;
    opacity: 0.9;
}

.stat-value {
    font-size: 1.2em;
    font-weight: 700;
}

.chart-header h2 {
    color: #333;
    font-size: 1.8em;
}

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

.chart-period {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background: white;
    font-size: 0.9em;
    margin-left: 15px;
}

.chart-period-label {
    padding: 8px 12px;
    background: rgba(76, 175, 80, 0.1);
    border: 2px solid #4CAF50;
    border-radius: 5px;
    font-size: 0.9em;
    color: #4CAF50;
    font-weight: 600;
    margin-left: 15px;
    display: inline-block;
}

.chart-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    background: #e0e0e0;
    color: #333;
}

.chart-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.chart-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* Alerts Section */
.alerts-section {
    margin-bottom: 30px;
}

.alerts-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.alerts-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.alerts-header h2 {
    color: #333;
    font-size: 1.8em;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.alerts-list {
    display: grid;
    gap: 15px;
}

.alert-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: #f8f9fa;
    border-radius: 10px;
    border-left: 4px solid;
}

.alert-item.above {
    border-left-color: #4CAF50;
}

.alert-item.below {
    border-left-color: #f44336;
}

.alert-info {
    flex: 1;
}

.alert-type {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.8em;
    color: #666;
}

.alert-details {
    font-size: 1.1em;
    margin-top: 5px;
}

.alert-actions {
    display: flex;
    gap: 10px;
}

.btn-delete {
    background: #f44336;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.3s ease;
}

.btn-delete:hover {
    background: #d32f2f;
    transform: translateY(-1px);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: white;
    margin: 15% auto;
    padding: 0;
    border-radius: 15px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    border-bottom: 1px solid #e0e0e0;
}

.modal-header h3 {
    color: #333;
    font-size: 1.5em;
}

.close {
    color: #666;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
}

.close:hover {
    color: #333;
}

.modal-body {
    padding: 30px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
}

.form-actions button {
    padding: 12px 24px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.form-actions button[type="button"] {
    background: #e0e0e0;
    color: #333;
}

.form-actions button[type="button"]:hover {
    background: #ccc;
}

/* Alert Notifications */
.alert-notifications {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.alert-notification {
    background: #4CAF50;
    color: white;
    padding: 15px 20px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    animation: slideIn 0.3s ease-out;
    max-width: 300px;
}

.alert-notification.warning {
    background: #ff9800;
}

.alert-notification.error {
    background: #f44336;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    header h1 {
        font-size: 2em;
    }
    
    .price-display {
        grid-template-columns: 1fr;
    }
    
    .chart-header {
        flex-direction: column;
        gap: 15px;
    }
    
    .alerts-header {
        flex-direction: column;
        gap: 15px;
    }
    
    .alert-item {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .modal-content {
        width: 95%;
        margin: 5% auto;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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