.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    color: white;
    font-size: 24px;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.error-container {
    background-color: #fee2e2;
    border-left: 4px solid #ef4444;
    color: #b91c1c;
    padding: 16px;
    margin-bottom: 20px;
    border-radius: 8px;
    display: none;
}

.error-container h3 {
    margin-top: 0;
    font-size: 18px;
}

.error-container p {
    margin-bottom: 0;
}

.error-container pre {
    background-color: rgba(255, 255, 255, 0.5);
    padding: 10px;
    border-radius: 4px;
    overflow-x: auto;
    margin-top: 10px;
}

.error-container button {
    background-color: #b91c1c;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    margin-top: 10px;
    cursor: pointer;
}

.error-container button:hover {
    background-color: #991b1b;
}

/* Dashboard theme improvements */
.dashboard {
    --primary-gradient: linear-gradient(135deg, #4361ee 0%, #3f37c9 100%);
}

.kpi-card:hover {
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
}

.kpi-card .kpi-icon {
    background: var(--primary-gradient);
    color: white;
}

.kpi-card .kpi-icon i {
    color: white;
}

.nav li:hover, .nav li.active {
    background: var(--primary-gradient);
    color: white;
    border-left-color: white;
}

.submit-btn {
    background: var(--primary-gradient);
}

/* Dark mode toggle */
.theme-toggle {
    position: absolute;
    bottom: 70px;
    width: 100%;
    display: flex;
    justify-content: center;
}

.theme-toggle button {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.theme-toggle button:hover {
    background: rgba(255,255,255,0.1);
}

/* Card hover effects */
.chart-card, .insight-card, .prediction-result, .input-form {
    transition: all 0.3s ease;
}

.chart-card:hover, .insight-card:hover, .prediction-result:hover, .input-form:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

/* Improved headers */
.section-header h2 {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}