/* 链条节数与中心距计算器 —— 链条展开带 + 装配单
   顶部整幅链条节数带，下方左参数右三卡。 */

/* 顶部链条带 */
.ch-strip {
    margin-top: 22px;
    background: var(--d3-card);
    border: 1px solid var(--d3-line);
    border-radius: var(--d3-radius);
    overflow: hidden;
}

.ch-strip-head {
    display: flex;
    align-items: flex-end;
    gap: 20px;
    padding: 14px 20px 10px;
    border-bottom: 1px dashed var(--d3-line);
}
.ch-strip-main { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.ch-strip-main > span {
    font-size: 12.5px;
    font-weight: 600;
    color: var(--d3-ink-3);
}
.ch-strip-main b {
    display: inline-flex;
    align-items: baseline;
    gap: 5px;
    font-family: var(--d3-mono);
    font-variant-numeric: tabular-nums;
    font-size: clamp(26px, 3.2vw, 34px);
    font-weight: 700;
    letter-spacing: -.03em;
    line-height: 1.1;
    color: var(--d3-ink);
}
.ch-strip-main b small {
    font-family: var(--d3-sans);
    font-size: 12.5px;
    font-weight: 600;
    color: var(--d3-ink-3);
}
.ch-strip-meta {
    margin-left: auto;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 2px;
    font-size: 12px;
    color: var(--d3-ink-3);
}
.ch-strip-meta span:first-child {
    color: var(--d3-accent);
    font-weight: 650;
}

.ch-track {
    padding: 12px 20px 4px;
    background:
        linear-gradient(180deg, rgba(var(--d3-accent-rgb), .045), transparent 70%);
}

/* 链节条：每个格子代表若干节，按宽度自适应压缩 */
.ch-links {
    display: flex;
    align-items: center;
    gap: 2px;
    height: 30px;
}
.ch-cell {
    position: relative;
    flex: 1 1 0;
    min-width: 0;
    height: 22px;
    border: 1.5px solid var(--d3-accent);
    border-radius: 11px;
    background: var(--d3-card-2);
    transition: background .2s ease;
}
.ch-cell.alt { background: rgba(var(--d3-accent-rgb), .16); }
.ch-cell::before,
.ch-cell::after {
    content: "";
    position: absolute;
    top: 50%;
    width: 4px;
    height: 4px;
    margin-top: -2px;
    border-radius: 50%;
    background: var(--d3-accent);
    opacity: .9;
}
.ch-cell::before { left: 3px; }
.ch-cell::after { right: 3px; }
.ch-cell.is-tick { border-color: var(--d3-accent); }

.ch-ticks {
    display: flex;
    gap: 2px;
    margin-top: 3px;
    height: 14px;
}
.ch-ticks span {
    flex: 1 1 0;
    min-width: 0;
    font-family: var(--d3-mono);
    font-size: 9.5px;
    line-height: 1;
    color: var(--d3-ink-3);
    text-align: center;
    white-space: nowrap;
}
.ch-ticks span.is-on {
    color: var(--d3-accent);
    font-weight: 700;
}

.ch-strip-foot {
    display: flex;
    gap: 12px;
    padding: 6px 20px 12px;
    font-size: 11.5px;
    color: var(--d3-ink-3);
}
.ch-strip-foot span:last-child { margin-left: auto; font-family: var(--d3-mono); }

/* SVG 链条 */
.ch-link { fill: var(--d3-card-2); stroke: var(--d3-accent); stroke-width: 1.4; }
.ch-link.alt { fill: rgba(var(--d3-accent-rgb), .14); }
.ch-pin { fill: var(--d3-accent); opacity: .85; }
.ch-tick { stroke: var(--d3-line-2); stroke-width: 1; }
.ch-tick-label { font-family: var(--d3-mono); font-size: 9.5px; fill: var(--d3-ink-3); }
.ch-ellipsis { font-family: var(--d3-mono); font-size: 12px; fill: var(--d3-ink-3); }

/* 布局 */
.ch-desk {
    display: grid;
    grid-template-columns: minmax(0, .96fr) minmax(0, 1.04fr);
    gap: 18px;
    align-items: start;
    margin-top: 18px;
}
.ch-right { display: grid; gap: 14px; min-width: 0; }

.ch-tight { padding: 14px 18px 15px; }

/* 主数字 */
.ch-hero-num {
    display: flex;
    align-items: baseline;
    gap: 10px;
    flex-wrap: wrap;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--d3-line);
}
.ch-hero-num > span { font-size: 12px; font-weight: 600; color: var(--d3-ink-3); }
.ch-hero-num b {
    display: inline-flex;
    align-items: baseline;
    gap: 5px;
    font-family: var(--d3-mono);
    font-variant-numeric: tabular-nums;
    font-size: clamp(27px, 3.4vw, 36px);
    font-weight: 700;
    letter-spacing: -.03em;
    color: var(--d3-accent);
    line-height: 1.14;
}
.ch-hero-num b small {
    font-family: var(--d3-sans);
    font-size: 12.5px;
    font-weight: 600;
    color: var(--d3-ink-3);
}
.ch-hero-num em {
    margin-left: auto;
    font-style: normal;
    font-family: var(--d3-mono);
    font-size: 12px;
    color: var(--d3-ink-3);
    white-space: nowrap;
}

/* 列表 */
.ch-list { list-style: none; margin: 0; padding: 0; font-size: 13.5px; }
.ch-list li {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding: 6px 0;
    border-bottom: 1px dotted var(--d3-line);
    color: var(--d3-ink-2);
}
.ch-list li:last-child { border-bottom: 0; }
.ch-list li b {
    margin-left: auto;
    font-family: var(--d3-mono);
    font-variant-numeric: tabular-nums;
    font-size: 13px;
    color: var(--d3-ink);
    white-space: nowrap;
}

/* 链轮尺寸表 */
.ch-wheel-table { min-width: 0; width: 100%; }
.ch-wheel-table th, .ch-wheel-table td { white-space: nowrap; padding: 8px 10px; }

/* 按钮 */
.ch-actions { display: flex; gap: 8px; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--d3-line); }
.ch-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;
}
.ch-btn:hover { filter: brightness(1.08); }
.ch-btn:active { transform: translateY(1px); }
.ch-btn-ghost { background: transparent; color: var(--d3-ink-2); border-color: var(--d3-line-2); }
.ch-btn-ghost:hover { color: var(--d3-ink); border-color: var(--d3-ink-3); filter: none; }

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

/* 型号表 */
.ch-table-wrap { margin-top: 14px; }
#chModelTable { min-width: 640px; }
#chModelTable tr.is-current td {
    background: rgba(var(--d3-accent-rgb), .08);
    font-weight: 700;
}
#chModelTable tr.is-current td:first-child::after {
    content: " · 当前";
    font-size: 10.5px;
    font-weight: 600;
    color: var(--d3-accent);
}

@media (max-width: 980px) {
    .ch-desk { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
    .ch-strip-head { padding: 12px 15px 8px; flex-wrap: wrap; gap: 8px; }
    .ch-strip-meta { align-items: flex-start; margin-left: 0; width: 100%; flex-direction: row; gap: 10px; }
    .ch-track { padding: 10px 14px 2px; }
    .ch-links { height: 26px; gap: 1px; }
    .ch-cell { height: 19px; border-radius: 10px; }
    .ch-cell::before, .ch-cell::after { width: 3px; height: 3px; margin-top: -1.5px; }
    .ch-cell::before { left: 2px; }
    .ch-cell::after { right: 2px; }
    .ch-ticks { gap: 1px; }
    .ch-ticks span { font-size: 8.5px; }
    .ch-strip-foot { padding: 4px 15px 10px; flex-wrap: wrap; }
    .ch-strip-foot span:last-child { margin-left: 0; }
    .ch-hero-num em { margin-left: 0; width: 100%; }
    .ch-actions { flex-wrap: wrap; }
    .ch-btn { flex: 1 1 auto; text-align: center; }
}

:root[data-theme="dark"] .ch-btn { color: #0c0e12; }
:root[data-theme="dark"] .ch-link { fill: #171c25; }