:root {
    --bg-body: #f6f8fa;
    --bg-card: #ffffff;
    --bg-input: #ffffff;
    --bg-secondary: #f6f8fa;
    --text-primary: #24292f;
    --text-secondary: #57606a;
    --text-label: #24292f;
    --border-color: #d0d7de;
    --border-input: #d0d7de;
    --accent-color: #0969da;
    --accent-hover: #0550ae;
    --shadow: none;
    --grid-color: #d0d7de;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main {
    flex: 1;
    display: flex;
    gap: 20px;
    padding: 20px 24px;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.panel {
    width: 320px;
    flex-shrink: 0;
    height: fit-content;
}

.section {
    margin-bottom: 20px;
}

.section h2 {
    font-size: 14px;
    font-weight: 600;
    margin: 0 0 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid #eaeef2;
}

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

.radio {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: border-color 0.15s;
}

.radio.active,
.radio:hover {
    border-color: #0969da;
}

.radio input {
    margin: 0;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    cursor: pointer;
    margin-top: 4px;
}

.checkbox input {
    margin: 0;
}

.chip-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.chip {
    padding: 5px 10px;
    border: 1px solid #d0d7de;
    border-radius: 16px;
    background: #ffffff;
    cursor: pointer;
    font-size: 12px;
    color: #24292f;
    transition: all 0.15s;
}

.chip:hover,
.chip.active {
    background: #0969da;
    color: #ffffff;
    border-color: #0969da;
}

.voltage-hint {
    padding: 10px 12px;
    background: #f6f8fa;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    font-size: 13px;
    color: #57606a;
    line-height: 1.8;
}

.voltage-hint strong {
    color: #24292f;
    font-weight: 600;
}

.info-value {
    padding: 8px 10px;
    background: #f6f8fa;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
}

.actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.summary {
    background: #f6f8fa;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    padding: 12px;
}

.summary h3 {
    margin: 0 0 10px;
    font-size: 13px;
    font-weight: 600;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    border-bottom: 1px solid #eaeef2;
    font-size: 13px;
}

.summary-item:last-child {
    border-bottom: none;
}

.summary-item span {
    color: #57606a;
}

.canvas-area {
    flex: 1;
    background: #ffffff;
    border: 1px solid #d0d7de;
    border-radius: 8px;
    padding: 20px;
    overflow: auto;
}

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

.diagram-card {
    width: 100%;
    border: 1px solid #d0d7de;
    border-radius: 8px;
    padding: 14px;
    background: #ffffff;
}

.svg-wrap {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
    overflow: auto;
}

.svg-wrap svg {
    max-width: 100%;
    height: auto;
}

.error {
    color: #cf222e;
    font-size: 13px;
    margin-top: 6px;
}

@media (max-width: 900px) {
    .main {
        flex-direction: column;
    }

    .panel {
        width: 100%;
    }

    .diagrams {
        gap: 16px;
    }
}

@media print {
    .panel,
    .common-header {
        display: none;
    }

    .main {
        padding: 0;
    }

    .canvas-area {
        border: none;
    }

    .diagrams {
        page-break-inside: avoid;
    }
}