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

:root {
    --primary-color: #1976d2;
    --primary-dark: #1565c0;
    --secondary-color: #424242;
    --success-color: #4caf50;
    --error-color: #f44336;
    --warning-color: #ff9800;
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #e0e0e0;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 8px rgba(0,0,0,0.15);
}

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    background: var(--card-bg);
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.header h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-color);
}

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

.api-key-input {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    width: 250px;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #ccc;
    display: inline-block;
}

.status-indicator.connected {
    background-color: var(--success-color);
}

.status-indicator.disconnected {
    background-color: var(--error-color);
}

/* Navigation */
.nav {
    background: var(--card-bg);
    padding: 0;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    display: flex;
    gap: 0;
}

.nav-link {
    padding: 15px 25px;
    text-decoration: none;
    color: var(--text-secondary);
    border-bottom: 3px solid transparent;
    transition: all 0.2s;
}

.nav-link:hover {
    background-color: var(--bg-color);
    color: var(--text-primary);
}

.nav-link.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    font-weight: 600;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

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

.btn-secondary:hover {
    background-color: #616161;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Main Content */
.main-content {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    min-height: 400px;
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.error {
    background-color: #ffebee;
    color: var(--error-color);
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
    border-left: 4px solid var(--error-color);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.stat-card h3 {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 32px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Charts Section */
.charts-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.chart-card {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
}

.chart-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.chart-placeholder {
    padding: 20px;
    color: var(--text-secondary);
}

.chart-placeholder p {
    margin: 10px 0;
    font-size: 14px;
}

/* Providers Section */
.providers-section {
    max-width: 900px;
}

.providers-section h2 {
    font-size: 24px;
    margin-bottom: 10px;
}

.info-text {
    color: var(--text-secondary);
    margin-bottom: 30px;
    padding: 15px;
    background: #e3f2fd;
    border-left: 4px solid var(--primary-color);
    border-radius: 4px;
}

.provider-config {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

.provider-card {
    background: var(--bg-color);
    padding: 25px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.provider-card h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.provider-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-select {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    background: white;
    cursor: pointer;
}

.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(25, 118, 210, 0.1);
}

.provider-status {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}

.status-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.status-badge {
    padding: 5px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.status-online {
    background-color: #e8f5e9;
    color: #2e7d32;
}

.status-offline {
    background-color: #ffebee;
    color: var(--error-color);
}

.status-unknown {
    background-color: #fff3e0;
    color: var(--warning-color);
}

.form-actions {
    display: flex;
    gap: 10px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-actions {
        width: 100%;
        flex-direction: column;
    }

    .api-key-input {
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .charts-section {
        grid-template-columns: 1fr;
    }
}