:root {
    --primary: #2f5597;
    --primary-dark: #1f3c6d;
    --bg-main: #f1f5f9;
    --bg-card: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #cbd5e1;
}

.lb-container {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    padding: 30px;
    border-radius: 12px;
    max-width: 1250px;
    margin: 20px auto;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

.lb-header {
    margin-bottom: 25px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 15px;
}

.lb-header h2 { margin: 0; color: var(--primary); font-size: 1.8rem; font-weight: 800; }
.lb-header p { margin: 5px 0 0 0; color: var(--text-muted); }

.lb-grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 30px;
}

@media (max-width: 950px) {
    .lb-grid { grid-template-columns: 1fr; }
}

.lb-card {
    background: var(--bg-card);
    padding: 22px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.lb-card h3 {
    margin-top: 0; margin-bottom: 15px;
    color: var(--primary); font-size: 1.15rem;
    border-left: 4px solid var(--primary); padding-left: 10px;
    font-weight: 700;
}

.lb-input-group { margin-bottom: 15px; }
.lb-input-group label { display: block; font-weight: bold; font-size: 0.85rem; margin-bottom: 5px; color: var(--text-muted); }
.lb-input-group input, .lb-input-group select {
    width: 100%; padding: 10px; border: 1px solid var(--border-color); border-radius: 6px; font-size: 0.95rem; box-sizing: border-box;
    background: #f8fafc;
}
.lb-input-group input:focus, .lb-input-group select:focus {
    outline: none; border-color: var(--primary); background: #ffffff;
}

.lb-input-row { display: flex; gap: 15px; }
.lb-input-row .lb-input-group { flex: 1; }

.lb-btn-row { display: flex; gap: 10px; margin-bottom: 10px; }
.lb-btn {
    flex: 1; padding: 10px; border: none; border-radius: 6px; font-weight: bold; cursor: pointer; font-size: 0.88rem; transition: all 0.2s;
}
.btn-danger { background: #ef4444; color: white; }
.btn-danger:hover { background: #dc2626; }
.btn-secondary { background: #64748b; color: white; }
.btn-secondary:hover { background: #475569; }
#lb-btn-pdf:hover { background: #166534 !important; transform: translateY(-1px); }

.lb-divider { border: 0; height: 1px; background: var(--border-color); margin: 20px 0; }
.lb-hint { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 15px; line-height: 1.4; }

.lb-canvas-wrapper {
    width: 100%; background: #0f172a; border-radius: 8px; padding: 10px; box-sizing: border-box; display: flex; justify-content: center;
}
#lb-canvas {
    background: #1e293b; cursor: crosshair; max-width: 100%; height: auto; border-radius: 4px;
}
.lb-canvas-status { font-size: 0.82rem; font-style: italic; color: var(--text-muted); margin: 8px 0 0 0; text-align: right; }

.lb-result-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.lb-result-box { background: #f8fafc; padding: 10px; border-radius: 6px; border: 1px solid var(--border-color); text-align: center; }
.lb-result-box .lb-label { display: block; font-size: 0.78rem; color: var(--text-muted); margin-bottom: 4px; }
.lb-result-box .lb-value { font-weight: bold; font-size: 1.1rem; color: var(--primary); }