/* 换热器面积与换热量计算器 —— 温度曲线 + 三数结果条
   与链条（展开带）、弹簧（曲线卡）区分：主视觉是两股流体的沿程温度线与温差带。 */

.hx-desk {
    display: grid;
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    gap: 18px;
    align-items: start;
    margin-top: 24px;
}

.hx-right { display: grid; gap: 14px; min-width: 0; }

/* 计算基准 */
.hx-base {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin: 14px 0 4px;
}
.hx-base label {
    position: relative;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 11px;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--d3-ink-2);
    border: 1px solid var(--d3-line-2);
    border-radius: var(--d3-radius-sm);
    background: var(--d3-paper);
    transition: all .15s ease;
    user-select: none;
}
.hx-base input { position: absolute; opacity: 0; pointer-events: none; }
.hx-base label::before {
    content: "";
    flex: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 1.5px solid var(--d3-line-2);
    background: var(--d3-card);
    transition: all .15s ease;
}
.hx-base label:hover { border-color: var(--d3-accent); }
.hx-base label:has(input:checked) {
    border-color: var(--d3-accent);
    background: rgba(var(--d3-accent-rgb), .07);
    color: var(--d3-accent);
}
.hx-base label:has(input:checked)::before {
    border-color: var(--d3-accent);
    box-shadow: inset 0 0 0 3px var(--d3-card), inset 0 0 0 8px var(--d3-accent);
}

/* 只读输入（由另一侧热平衡反算） */
.d3-io.hx-readonly { background: var(--d3-card-2); border-style: dashed; }
.d3-io.hx-readonly input { color: var(--d3-ink-2); cursor: default; }

/* 曲线卡 */
.hx-plot {
    background: var(--d3-card);
    border: 1px solid var(--d3-line);
    border-radius: var(--d3-radius);
    overflow: hidden;
}
.hx-plot-head {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 11px 16px;
    border-bottom: 1px solid var(--d3-line);
    background: var(--d3-card-2);
}
.hx-plot-head h2 { font-size: 13.5px; }
.hx-plot-head span {
    margin-left: auto;
    font-family: var(--d3-mono);
    font-size: 11px;
    color: var(--d3-ink-3);
}
#hxChart { display: block; width: 100%; height: auto; padding: 6px 4px 0; }

.hx-plot-legend {
    display: flex;
    gap: 16px;
    padding: 4px 16px 11px;
    font-size: 11.5px;
    color: var(--d3-ink-3);
}
.hx-plot-legend span { display: inline-flex; align-items: center; gap: 6px; }
.hx-plot-legend i { width: 14px; height: 3px; border-radius: 2px; display: block; }
.hx-lg-hot { background: #c2410c; }
.hx-lg-cold { background: #2f6d9a; }
.hx-lg-gap { background: rgba(194, 65, 12, .22); height: 10px; border-radius: 3px; }

/* SVG 曲线 */
.hx-grid { stroke: var(--d3-line); stroke-width: 1; stroke-dasharray: 3 4; }
.hx-axis { stroke: var(--d3-line-2); stroke-width: 1; }
.hx-tick { font-family: var(--d3-mono); font-size: 10px; fill: var(--d3-ink-3); }
.hx-axis-label { font-family: var(--d3-mono); font-size: 10.5px; fill: var(--d3-ink-3); }
.hx-line-hot { stroke: #c2410c; stroke-width: 2.4; fill: none; }
.hx-line-cold { stroke: #2f6d9a; stroke-width: 2.4; fill: none; }
.hx-gap { fill: rgba(194, 65, 12, .10); }
.hx-node { stroke: var(--d3-card); stroke-width: 2; }
.hx-node-hot { fill: #c2410c; }
.hx-node-cold { fill: #2f6d9a; }
.hx-tag { font-family: var(--d3-mono); font-size: 10px; font-weight: 700; }

/* 三数结果 */
.hx-nums {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    background: var(--d3-card);
    border: 1px solid var(--d3-line);
    border-radius: var(--d3-radius);
    overflow: hidden;
}
.hx-num {
    padding: 13px 15px 14px;
    min-width: 0;
}
.hx-num + .hx-num { border-left: 1px dashed var(--d3-line-2); }
.hx-num > span {
    display: block;
    font-size: 11.5px;
    font-weight: 600;
    color: var(--d3-ink-3);
}
.hx-num b {
    display: flex;
    align-items: baseline;
    gap: 4px;
    margin-top: 3px;
    font-family: var(--d3-mono);
    font-variant-numeric: tabular-nums;
    font-size: clamp(20px, 2.6vw, 26px);
    font-weight: 700;
    letter-spacing: -.03em;
    line-height: 1.15;
    color: var(--d3-ink);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.hx-num b small {
    font-family: var(--d3-sans);
    font-size: 11px;
    font-weight: 600;
    color: var(--d3-ink-3);
}
.hx-num em {
    display: block;
    margin-top: 2px;
    font-style: normal;
    font-size: 11px;
    color: var(--d3-ink-3);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.hx-num-strong { background: rgba(var(--d3-accent-rgb), .06); }
.hx-num-strong b { color: var(--d3-accent); }

/* 校核列表 */
.hx-tight { padding: 13px 18px 14px; }
.hx-list { list-style: none; margin: 0; padding: 0; font-size: 13px; }
.hx-list li {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding: 5px 0;
    border-bottom: 1px dotted var(--d3-line);
    color: var(--d3-ink-2);
}
.hx-list li:last-child { border-bottom: 0; }
.hx-list li b {
    margin-left: auto;
    font-family: var(--d3-mono);
    font-variant-numeric: tabular-nums;
    font-size: 12.5px;
    color: var(--d3-ink);
    white-space: nowrap;
}

/* 按钮 */
.hx-actions { display: flex; gap: 8px; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--d3-line); }
.hx-btn {
    appearance: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 13px;
    font-weight: 650;
    line-height: 1;
    padding: 10px 15px;
    border-radius: 7px;
    border: 1px solid var(--d3-accent);
    background: var(--d3-accent);
    color: #fff;
    transition: filter .15s ease, transform .1s ease;
}
.hx-btn:hover { filter: brightness(1.08); }
.hx-btn:active { transform: translateY(1px); }
.hx-btn-ghost { background: transparent; color: var(--d3-ink-2); border-color: var(--d3-line-2); }
.hx-btn-ghost:hover { color: var(--d3-ink); border-color: var(--d3-ink-3); filter: none; }

.hx-alerts { display: grid; gap: 8px; margin-top: 14px; }
.hx-alerts:empty { display: none; }
.hx-alerts .d3-alert { font-size: 12.5px; padding: 9px 11px; }

/* 对比表 */
.hx-cmp { margin-top: 14px; }
#hxCmpTable { min-width: 760px; }
#hxCmpTable tr.is-current td {
    background: rgba(var(--d3-accent-rgb), .08);
    font-weight: 700;
}
#hxCmpTable tr.is-current td:first-child::after {
    content: " · 当前";
    font-size: 10.5px;
    font-weight: 600;
    color: var(--d3-accent);
}

@media (max-width: 1020px) {
    .hx-desk { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
    .hx-nums { grid-template-columns: minmax(0, 1fr); }
    .hx-num + .hx-num { border-left: 0; border-top: 1px dashed var(--d3-line-2); }
    .hx-num b { font-size: 22px; }
    .hx-base { grid-template-columns: minmax(0, 1fr); }
    .hx-actions { flex-wrap: wrap; }
    .hx-btn { flex: 1 1 auto; text-align: center; }
    .hx-tight { padding: 12px 15px 13px; }
}

:root[data-theme="dark"] .hx-btn { color: #0c0e12; }