/* VEK-Sankey Styles */

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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --background-color: #ecf0f1;
    --card-background: #ffffff;
    --text-color: #2c3e50;
    --border-color: #bdc3c7;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

.container {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem;
    box-shadow: var(--shadow);
    text-align: center;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1rem;
    opacity: 0.9;
}

/* Main Content */
.content {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    padding: 2rem;
    flex: 1;
}

/* Controls Panel */
.controls-panel {
    background: var(--card-background);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    height: fit-content;
    position: sticky;
    top: 2rem;
}

.controls-panel h2 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

fieldset {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1.5rem;
}

legend {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--primary-color);
    padding: 0 0.5rem;
}

.control-group {
    margin-bottom: 1.5rem;
}

.control-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-color);
}

.control-group span {
    color: var(--secondary-color);
    font-weight: 600;
}

.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(to right, var(--accent-color), var(--success-color));
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--secondary-color);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: background 0.2s, box-shadow 0.2s;
}

.slider::-webkit-slider-thumb:hover {
    background: var(--primary-color);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--secondary-color);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: background 0.2s, box-shadow 0.2s;
}

.slider::-moz-range-thumb:hover {
    background: var(--primary-color);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.control-group.checkbox {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.control-group.checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--secondary-color);
}

.control-group.checkbox label {
    margin: 0;
    cursor: pointer;
    font-weight: 500;
}

.reset-btn {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
    box-shadow: var(--shadow);
}

.reset-btn:hover {
    background-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.reset-btn:active {
    transform: translateY(1px);
}

/* Sankey Container */
.sankey-container {
    background: var(--card-background);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: center;
}

.main-content {
    width: 100%;
    display: flex;
    flex-direction: column;
}

#sankey {
    width: 100%;
    height: 600px;
}

/* Flows Overview */
.flows-overview {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.flows-overview h3 {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.flows-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.node-item {
    padding: 1.25rem;
    background: var(--background-color);
    border-left: 4px solid var(--secondary-color);
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.node-name {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.flows-section-header {
    font-weight: 600;
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-top: 0.5rem;
    margin-bottom: 0.25rem;
}

.node-item .flows-section-header:first-of-type {
    margin-top: 0;
}

.itemized-flow {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    padding-left: 1rem;
    color: var(--text-color);
}

.flow-source {
    font-weight: 500;
    color: var(--accent-color);
}

.flow-target {
    font-weight: 500;
    color: var(--success-color);
}

.flow-arrow {
    color: var(--border-color);
    font-size: 0.8rem;
}

.itemized-flow .flow-value {
    font-weight: 700;
    color: var(--primary-color);
    margin-left: auto;
    min-width: 70px;
    text-align: right;
}

.flow-total {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    margin: 0.5rem 0 0.5rem 1rem;
    border-top: 1px solid var(--border-color);
    padding-top: 0.75rem;
}

.total-label {
    font-weight: 700;
    color: var(--primary-color);
}

.total-value {
    font-weight: 700;
    color: var(--secondary-color);
    margin-left: auto;
    min-width: 70px;
    text-align: right;
    font-size: 1.05rem;
}

/* Footer */
footer {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 1.5rem;
    font-size: 0.9rem;
    margin-top: auto;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .content {
        grid-template-columns: 250px 1fr;
        gap: 1.5rem;
    }

    .controls-panel {
        position: relative;
        top: 0;
    }

    .flows-list {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .content {
        grid-template-columns: 1fr;
    }

    .controls-panel {
        position: relative;
        top: 0;
    }

    header h1 {
        font-size: 1.5rem;
    }

    #sankey {
        height: 400px;
    }

    .sankey-container {
        padding: 1rem;
    }

    .flows-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    header {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.2rem;
    }

    header p {
        font-size: 0.85rem;
    }

    .content {
        padding: 1rem;
        gap: 1rem;
    }

    .controls-panel {
        padding: 1rem;
    }

    #sankey {
        height: 300px;
    }
}

/* Loading State */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1rem;
    color: var(--secondary-color);
}

/* Error State */
.error {
    background-color: #fadbd8;
    color: var(--accent-color);
    padding: 1rem;
    border-radius: 6px;
    border-left: 4px solid var(--accent-color);
    margin-bottom: 1rem;
}