/* ============================================================
   Calculator Tool Pages — Shared Styles
   ============================================================ */
.calcTool { padding: 0.35rem 0 0.87rem; }
.calcTool .calcbox { margin-top: 25px; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-start; }
.calcTool .right { width: calc(960 / 1410 * 100%); }
.calcTool .tool-header { margin-bottom: 24px; }
.calcTool .tool-header h1 { font-size: 24px; font-weight: 700; color: #333; margin: 0 0 8px; }
.calcTool .tool-header p { font-size: 15px; color: #666; margin: 0; line-height: 1.6; }

/* Card */
.calcTool .tool-card { background: #fff; border-radius: 10px; padding: 32px; box-shadow: 0 2px 12px rgba(0,0,0,0.06); }

/* Input groups */
.calcTool .input-grid { display: grid; gap: 16px; }
.calcTool .input-grid-2 { grid-template-columns: 1fr 1fr; }
.calcTool .input-grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.calcTool .input-group { display: flex; flex-direction: column; }
.calcTool .input-group label { font-size: 13px; color: #888; margin-bottom: 6px; font-weight: 500; }
.calcTool .input-with-unit { display: flex; align-items: center; border: 2px solid #e0e0e0; border-radius: 8px; overflow: hidden; transition: border-color .2s; background: #fff; }
.calcTool .input-with-unit:focus-within { border-color: var(--color-primary); }
.calcTool .input-with-unit input { flex: 1; height: 44px; border: none; padding: 0 12px; font-size: 16px; outline: none; background: transparent; min-width: 0; }
.calcTool .input-with-unit .unit { padding: 0 12px; font-size: 14px; color: #888; background: #f5f5f5; height: 44px; display: flex; align-items: center; white-space: nowrap; border-left: 1px solid #e0e0e0; }
.calcTool .input-with-unit select { flex: 1; height: 44px; border: none; padding: 0 12px; font-size: 15px; outline: none; background: transparent; cursor: pointer; min-width: 0; }
.calcTool .field-hint { font-size: 14px; color: #999; }

/* Standalone select/input */
.calcTool .standalone-select { width: 100%; height: 48px; border: 2px solid #e0e0e0; border-radius: 8px; padding: 0 12px; font-size: 15px; background: #fafafa; cursor: pointer; outline: none; box-sizing: border-box; }
.calcTool .standalone-select:focus { border-color: var(--color-primary); }
.calcTool .standalone-input { width: 100%; height: 48px; border: 2px solid #e0e0e0; border-radius: 8px; padding: 0 14px; font-size: 16px; outline: none; box-sizing: border-box; transition: border-color .2s; }
.calcTool .standalone-input:focus { border-color: var(--color-primary); }

/* Buttons */
.calcTool .btn-row { display: flex; gap: 12px; margin-top: 24px; }
.calcTool .btn-calc { height: 48px; padding: 0 32px; border: none; border-radius: 8px; font-size: 16px; font-weight: 600; cursor: pointer; transition: all .2s; }
.calcTool .btn-calc.primary { background: var(--color-primary); color: #fff; }
.calcTool .btn-calc.primary:hover { background: var(--color-button); }
.calcTool .btn-calc.secondary { background: #f0f0f0; color: #333; }
.calcTool .btn-calc.secondary:hover { background: #e0e0e0; }

/* Result box */
.calcTool .result-box { margin-top: 24px; padding: 20px 24px; background: #f7f9fc; border-radius: 8px; border-left: 4px solid var(--color-primary); display: none; }
.calcTool .result-box .result-label { font-size: 13px; color: #888; margin-bottom: 8px; }
.calcTool .result-box .result-value { font-size: 28px; font-weight: 700; color: var(--color-primary); word-break: break-all; }
.calcTool .result-box .result-formula { font-size: 13px; color: #999; margin-top: 8px; font-family: 'Courier New', monospace; }
.calcTool .result-multi .result-row { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; border-bottom: 1px solid #eee; }
.calcTool .result-multi .result-row:last-child { border-bottom: none; }
.calcTool .result-multi .result-row span { font-size: 14px; color: #666; }
.calcTool .result-multi .result-row strong { font-size: 18px; color: var(--color-primary); }

/* Formula reference */
.calcTool .formula-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.calcTool .formula-item { padding: 10px 14px; background: #f5f7fa; border-radius: 6px; font-size: 15px; font-family: 'Courier New', monospace; color: #333; }
.calcTool .formula-item .formula-label { font-weight: 700; color: var(--color-primary); }

/* Active sidebar link */
.calcTool .calcbox .left .li .lbt a.active { color: var(--color-primary); font-weight: 600; }

/* Color band selects (resistor color code) */
.calcTool .band-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: flex-end; }
.calcTool .band-select { flex: 1; min-width: 80px; }
.calcTool .band-select label { display: block; font-size: 12px; color: #888; margin-bottom: 4px; text-align: center; }
.calcTool .band-select select { width: 100%; height: 40px; border: 2px solid #e0e0e0; border-radius: 6px; font-size: 14px; padding: 0 6px; outline: none; cursor: pointer; }
.calcTool .band-select select:focus { border-color: var(--color-primary); }

/* SVG Circuit diagram */
.calcTool .circuit-svg { max-width: 100%; height: auto; margin: 0 auto; display: block; }

/* Toggle buttons (series/parallel, etc.) */
.calcTool .toggle-group { display: inline-flex; border: 2px solid #e0e0e0; border-radius: 8px; overflow: hidden; }
.calcTool .toggle-group button { padding: 8px 20px; border: none; background: #fff; font-size: 14px; cursor: pointer; transition: all .15s; }
.calcTool .toggle-group button.active { background: var(--color-primary); color: #fff; }
.calcTool .toggle-group button:not(.active):hover { background: #f5f5f5; }

/* Tab buttons (4-band / 5-band) */
.calcTool .tab-row { display: flex; gap: 8px; margin-bottom: 16px; }
.calcTool .tab-btn { padding: 8px 24px; border: 2px solid #e0e0e0; border-radius: 8px; background: #fff; font-size: 14px; cursor: pointer; transition: all .15s; }
.calcTool .tab-btn.active { border-color: var(--color-primary); background: var(--color-primary); color: #fff; }
.calcTool .tab-btn:not(.active):hover { border-color: #bbb; }

/* Resistor visual */
.calcTool .resistor-visual { text-align: center; margin: 16px 0; }

/* Canvas for charts */
.calcTool .chart-container { position: relative; margin-top: 16px; height: 200px; }
.calcTool .chart-container canvas { width: 100% !important; height: 100% !important; }

/* Responsive */
@media (max-width: 768px) {
    .calcTool .calcbox { flex-direction: column; }
    .calcTool .right, .calcbox .left { width: 100% !important; }
    .calcbox .left { margin-bottom: 20px; }
    .calcTool .input-grid-2, .calcTool .input-grid-3 { grid-template-columns: 1fr; }
    .calcTool .tool-card { padding: 20px; }
    .calcTool .formula-grid { grid-template-columns: 1fr 1fr; }
    .calcTool .band-row { gap: 4px; }
}