/* 皮带长度与中心距计算器 —— 工程图纸风格
   与电镀（凭单）、喷涂（KPI 带）区分：左参数右图纸，图纸随参数实时重绘。 */

/* 计算方向：下划线标签页 */
.bl-mode {
    display: flex;
    gap: 22px;
    border-bottom: 1px solid var(--d3-line);
    margin: 2px 0 14px;
}
.bl-mode label {
    position: relative;
    cursor: pointer;
    padding: 6px 0 10px;
    font-size: 13px;
    font-weight: 600;
    color: var(--d3-ink-3);
    user-select: none;
    white-space: nowrap;
}
.bl-mode input { position: absolute; opacity: 0; pointer-events: none; }
.bl-mode label:hover { color: var(--d3-ink); }
.bl-mode label::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: -1px;
    height: 2px;
    background: transparent;
    border-radius: 2px;
    transition: background .16s ease;
}
.bl-mode label:has(input:checked) { color: var(--d3-accent); }
.bl-mode label:has(input:checked)::after { background: var(--d3-accent); }

/* 传动形式：小方块选择 */
.bl-type {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-bottom: 16px;
}
.bl-type label {
    cursor: pointer;
    text-align: center;
    font-size: 13px;
    font-weight: 600;
    color: var(--d3-ink-2);
    padding: 8px 10px;
    border: 1px solid var(--d3-line-2);
    border-radius: var(--d3-radius-sm);
    background: var(--d3-paper);
    transition: all .15s ease;
    user-select: none;
}
.bl-type input { position: absolute; opacity: 0; pointer-events: none; }
.bl-type label:hover { border-color: var(--d3-accent); }
.bl-type label:has(input:checked) {
    border-color: var(--d3-accent);
    background: rgba(var(--d3-accent-rgb), .09);
    color: var(--d3-accent);
    box-shadow: inset 0 0 0 1px rgba(var(--d3-accent-rgb), .35);
}

/* 带长输入组：仅在反算模式启用 */
.bl-length-group { transition: opacity .18s ease; }
.bl-length-group.is-dim > .d3-group-title { opacity: .55; }
.bl-length-group.is-dim .d3-io { background: var(--d3-card-2); }
.d3-io input[readonly] { color: var(--d3-ink-2); cursor: default; }

.bl-actions { display: flex; gap: 8px; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--d3-line); }

.bl-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;
}
.bl-btn:hover { filter: brightness(1.08); }
.bl-btn:active { transform: translateY(1px); }
.bl-btn-ghost { background: transparent; color: var(--d3-ink-2); border-color: var(--d3-line-2); }
.bl-btn-ghost:hover { color: var(--d3-ink); border-color: var(--d3-ink-3); filter: none; }

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

/* 布局 */
.bl-desk {
    display: grid;
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    gap: 18px;
    align-items: start;
    margin-top: 24px;
}

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

/* 图纸卡 */
.bl-figure {
    margin: 0;
    background: var(--d3-card);
    border: 1px solid var(--d3-line);
    border-radius: var(--d3-radius);
    overflow: hidden;
}
.bl-figure-head {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 15px;
    border-bottom: 1px solid var(--d3-line);
    background: var(--d3-card-2);
    font-family: var(--d3-mono);
    font-size: 11px;
    letter-spacing: .06em;
    color: var(--d3-ink-3);
}
.bl-figure-head span:last-child { margin-left: auto; letter-spacing: 0; }
#blDiagram {
    display: block;
    width: 100%;
    height: auto;
    color: var(--d3-ink-3);
    background: var(--d3-card);
}
.bl-figure figcaption {
    padding: 8px 15px 12px;
    font-size: 11.5px;
    line-height: 1.6;
    color: var(--d3-ink-3);
}

/* SVG 元素 */
.bl-pulley { fill: rgba(var(--d3-accent-rgb), .13); stroke: var(--d3-accent); stroke-width: 2; }
.bl-pulley-hub { fill: var(--d3-card); stroke: var(--d3-accent); stroke-width: 1.5; }
.bl-belt { fill: none; stroke: var(--d3-ink); stroke-width: 7; stroke-linejoin: round; }
.bl-belt-dash { fill: none; stroke: var(--d3-ink-3); stroke-width: 1; stroke-dasharray: 3 4; opacity: .55; }
.bl-dim { stroke: var(--d3-ink-3); stroke-width: 1; stroke-dasharray: 5 4; opacity: .75; }
.bl-label { font-family: var(--d3-mono); font-size: 12px; fill: var(--d3-ink-2); }
.bl-label-sm { font-family: var(--d3-mono); font-size: 10.5px; fill: var(--d3-ink-3); }
.bl-label-strong { font-family: var(--d3-mono); font-size: 12.5px; font-weight: 700; fill: var(--d3-accent); }

/* 图纸文字加描边光晕，压在网格与皮带线上也能读清 */
.bl-label, .bl-label-sm, .bl-label-strong {
    paint-order: stroke;
    stroke: var(--d3-card);
    stroke-width: 3px;
    stroke-linejoin: round;
}
.bl-arrow { stroke: var(--d3-accent); stroke-width: 1.6; fill: none; }
.bl-arc { fill: none; stroke: var(--d3-accent); stroke-width: 1.4; stroke-dasharray: 4 3; opacity: .8; }

/* 结果条 */
.bl-result {
    background: var(--d3-card);
    border: 1px solid var(--d3-line);
    border-radius: var(--d3-radius);
    padding: 15px 18px 16px;
}
.bl-result-main {
    display: flex;
    align-items: baseline;
    gap: 12px;
    flex-wrap: wrap;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--d3-line);
}
.bl-rm-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--d3-ink-3);
    letter-spacing: .01em;
}
.bl-result-main .d3-big { font-size: clamp(28px, 3.6vw, 38px); }
.bl-result .d3-kv { margin-top: 13px; }

/* 选型表 */
.bl-sel { margin-top: 14px; }
.bl-sel .d3-table { min-width: 640px; }
.bl-sel tr.is-best td {
    background: rgba(var(--d3-accent-rgb), .075);
    font-weight: 700;
}
.bl-sel td.bl-verdict { font-family: var(--d3-sans); font-size: 12.5px; font-weight: 600; }
.bl-sel td.is-ok { color: var(--d3-ok); }
.bl-sel td.is-warn { color: var(--d3-warn); }
.bl-sel td.is-bad { color: var(--d3-bad); }
.bl-sel .d3-hint { margin-top: 9px; }

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

@media (max-width: 640px) {
    .bl-mode { gap: 16px; }
    .bl-mode label { font-size: 12px; }
    .bl-actions { flex-wrap: wrap; }
    .bl-btn { flex: 1 1 auto; text-align: center; }
    .bl-result { padding: 13px 15px 15px; }
    #blDiagram { min-height: 220px; }
}

:root[data-theme="dark"] .bl-btn { color: #0c0e12; }
:root[data-theme="dark"] .bl-figure figcaption { color: var(--d3-ink-3); }