/* 芒福德 · 钟楼：钟始终在，脚下的材料在变。
   .c-mumford 页面按芒福德的三个技术复合体换底色：水与木（始技术，首屏到第 2 问）→ 煤与铁（古技术，矿井与城市）→ 电与合金（新技术，第 5 问以后）。
   右侧那面钟只有七个时辰：7 世纪的教宗诏书规定修道院的钟一昼夜敲七次（《技术与文明》第 13 页）。 */
.c-mumford {
  --eo: #e0d3b9; --paleo: #1e1c1a; --neo: #e8ecef;
  --bg: var(--eo); --paper: #f3ecdc; --ink: #231b14; --ink-2: #463a2e; --ink-3: #5f5244; --rule: rgba(35, 27, 20, .22);
  --acc: #1f5069; --acc-ink: #f6f1e6;
  --gilt: #b98a38; --oak: #3b2f2a; --enamel: #f4ecd9;
  --head: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --body: "Noto Serif SC", "Songti SC", "STSong", serif;
  --lat: "Jost", "Noto Sans SC", sans-serif; --num: "Cinzel", "Noto Serif SC", serif;
  --bar-bg: rgba(224, 211, 185, .93); --chip-bg: rgba(243, 236, 220, .88); --chip-ring: #f3ecdc;
  --dialw: 180px;
  background-color: var(--eo);
}
.c-mumford .dlg { --dlg-bg: #ebe2cf; --dlg-paper: #fbf7ee; --dlg-ink: #231b14; --dlg-ink-2: #4b3f33; --dlg-ink-3: #6e6153;
  --dlg-me: #3b2f2a; --dlg-me-ink: #f6ecd8; --dlg-acc: #1f5069; }
.c-mumford .dlg .msg--me .msg__o summary { color: inherit; }

/* —— 三个技术复合体：每一屏自己的底色与质地 —— */
.c-mumford .c3hero, .c-mumford #clock, .c-mumford #phases {
  background-color: var(--eo);
  /* 木纹：竖向的细长纹理 */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='640' height='640'%3E%3Cfilter id='w' x='0' y='0' width='100%25' height='100%25' filterUnits='userSpaceOnUse'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.07 0.0035' numOctaves='3' seed='11' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.43 0 0 0 0 0.3 0 0 0 0 0.16 0 0 0 0.7 -0.25'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23w)'/%3E%3C/svg%3E");
}
.c-mumford #mine, .c-mumford #city {
  --bg: var(--paleo); --paper: #2a2725; --ink: #efe9df; --ink-2: #cdc5b9; --ink-3: #a99f92; --rule: rgba(239, 233, 223, .2);
  --acc: #e8925a; --acc-ink: #1e1c1a; --gilt: #d9a65a; --chip-bg: rgba(42, 39, 37, .92); --chip-ring: #2a2725;
  color: var(--ink); background-color: var(--paleo);
  /* 煤与铁：铁板的接缝与煤尘 */
  background-image: radial-gradient(rgba(255, 255, 255, .045) 1px, transparent 1.6px), radial-gradient(rgba(255, 255, 255, .03) 1px, transparent 1.6px),
    repeating-linear-gradient(90deg, transparent 0 279px, rgba(255, 255, 255, .035) 279px 280px);
  background-size: 9px 9px, 13px 13px, auto; background-position: 0 0, 5px 7px, 0 0;
}
.c-mumford #human, .c-mumford #megamachine, .c-mumford #assimilate, .c-mumford .c3end {
  --bg: var(--neo); --paper: #fafbfc; --ink: #10161c; --ink-2: #34404b; --ink-3: #525e69; --rule: rgba(16, 22, 28, .18);
  --acc: #2140b8; --acc-ink: #fff; --gilt: #a7782b; --chip-bg: rgba(250, 251, 252, .92); --chip-ring: #fafbfc;
  color: var(--ink); background-color: var(--neo);
  /* 电与合金：拉丝铝板与细导线 */
  background-image: repeating-linear-gradient(0deg, rgba(255, 255, 255, .5) 0 1px, transparent 1px 3px),
    linear-gradient(90deg, rgba(33, 64, 184, .05) 1px, transparent 1px);
  background-size: auto, 56px 56px;
}
/* 换代处：上一屏的底部渐变成下一个复合体的颜色 */
.c-mumford #phases, .c-mumford #city { padding-bottom: 200px; }
.c-mumford #phases::after, .c-mumford #city::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 170px; pointer-events: none; }
.c-mumford #phases::after { background: linear-gradient(to bottom, rgba(30, 28, 26, 0), var(--paleo)); }
.c-mumford #city::after { background: linear-gradient(to bottom, rgba(232, 236, 239, 0), var(--neo)); }

/* 页头跟着换色 */
.c-mumford .c3bar { font-family: var(--head); }
.c-mumford .c3bar__t span { font-family: var(--body); }
.c-mumford[data-cur="mine"] .c3bar, .c-mumford[data-cur="city"] .c3bar { --bar-bg: rgba(30, 28, 26, .93); --bar-ink: #efe9df; --rule: rgba(239, 233, 223, .18); }
.c-mumford[data-cur="human"] .c3bar, .c-mumford[data-cur="megamachine"] .c3bar, .c-mumford[data-cur="assimilate"] .c3bar, .c-mumford[data-cur="end"] .c3bar { --bar-bg: rgba(232, 236, 239, .93); --bar-ink: #10161c; --rule: rgba(16, 22, 28, .16); }
.c-mumford .c3bar__prog { background: var(--gilt); height: 3px; }

/* —— 钟：七个时辰的导航 —— */
.c-mumford .c3toc { right: 22px; top: 50%; transform: translateY(-50%); transition: opacity .45s, visibility .45s; }
.c-mumford[data-cur="top"] .c3toc { opacity: 0; visibility: hidden; }
.mf-dial { position: relative; width: 180px; }
.mf-dial__face { display: block; width: 180px; height: 180px; overflow: visible; filter: drop-shadow(0 8px 16px rgba(0, 0, 0, .28)); }
.mf-dial__case { fill: var(--oak); }
.mf-dial__gilt { fill: none; stroke: #c99a46; stroke-width: 2.4; }
.mf-dial__enamel { fill: var(--enamel); }
.mf-dial__ticks line { stroke: #7b6650; stroke-width: 1; }
.mf-dial__ticks line.mj { stroke: #2a211c; stroke-width: 2.4; }
.mf-dial__inner { fill: none; stroke: rgba(42, 33, 28, .16); stroke-width: 1; }
.mf-dial__hand { transform-box: view-box; transform-origin: 90px 90px; transform: rotate(var(--hand, 0deg)); fill: #c99a46; stroke: #6e4f1c; stroke-width: .7; }
.mf-dial__pin { fill: #6e4f1c; }
.mf-dial__ring { position: absolute; left: 0; top: 0; width: 180px; height: 180px; border-radius: 50%; pointer-events: none; }
.mf-dial__ring::before, .mf-dial__ring::after { content: ""; position: absolute; inset: 0; border-radius: 50%; border: 2px solid #c99a46; opacity: 0; }
.mf-dial__ring.is-ring::before { animation: mf-ring 1s ease-out; }
.mf-dial__ring.is-ring::after { animation: mf-ring 1s ease-out .18s; }
@keyframes mf-ring { 0% { transform: scale(1); opacity: .85; } 100% { transform: scale(1.38); opacity: 0; } }
.mf-dial__marks { list-style: none; margin: 0; padding: 0; position: absolute; left: 0; top: 0; width: 180px; height: 180px; }
.mf-dial__marks li { position: absolute; width: 40px; height: 40px; }
.c-mumford .c3toc .mf-dial__marks a::after, .c-mumford .c3toc .mf-dial__end::after { display: none; content: none; }
.c-mumford .c3toc .mf-dial__marks a { justify-content: center; gap: 0; }
.c-mumford .c3toc .mf-dial__end { justify-content: center; gap: 0; }
.c-mumford .c3toc .mf-dial__marks a span, .c-mumford .c3toc .mf-dial__marks a:hover span, .c-mumford .c3toc .mf-dial__marks a:focus-visible span { max-width: 20em; overflow: visible; white-space: normal; }
.mf-dial__marks a { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; color: #2a211c; text-decoration: none; }
.mf-dial__marks b { font-family: var(--num); font-weight: 700; font-size: 14px; line-height: 1; transition: color .2s, transform .2s; }
.mf-dial__marks a:hover b, .mf-dial__marks a:focus-visible b { color: #1f5069; transform: scale(1.15); }
.mf-dial__marks a[aria-current="true"] { background: radial-gradient(circle, rgba(201, 154, 70, .45) 0 15px, transparent 16px); }
.mf-dial__marks a[aria-current="true"] b { color: #6e4f1c; }
.mf-dial__top { display: block; width: 8px; height: 8px; transform: rotate(45deg); background: #2a211c; }
.mf-dial__marks a span { position: absolute; right: var(--tx); top: var(--ty); transform: translateY(-50%); width: max-content; max-width: 19em; padding: 6px 11px;
  background: var(--enamel); color: #231b14; border: 1px solid #c99a46; border-radius: 6px; box-shadow: 0 6px 18px rgba(0, 0, 0, .18);
  font: 500 13.5px/1.45 var(--head); opacity: 0; visibility: hidden; transition: opacity .18s; pointer-events: none; }
.mf-dial__marks a:hover span, .mf-dial__marks a:focus-visible span { opacity: 1; visibility: visible; }
.mf-dial__read { margin: 12px auto 0; width: 132px; padding: 5px 8px 6px; text-align: center; background: var(--enamel); color: #231b14;
  border: 1px solid #c99a46; border-radius: 6px; box-shadow: 0 4px 12px rgba(0, 0, 0, .14); line-height: 1.25; }
.mf-dial__read b { display: block; font: 600 19px/1.15 var(--lat); letter-spacing: .04em; font-variant-numeric: tabular-nums; }
.mf-dial__read span { font: 500 12px/1.4 var(--head); color: #5a4c3e; }
.mf-dial__end, .mf-dial__snd { display: flex; align-items: center; justify-content: center; margin: 8px auto 0; width: 132px; min-height: 40px; padding: 4px 8px;
  background: rgba(244, 236, 217, .9); color: #231b14; border: 1px solid rgba(35, 27, 20, .3); border-radius: 999px; font: 500 12.5px/1.2 var(--head); text-decoration: none; cursor: pointer; }
.mf-dial__end[aria-current="true"] { border-color: #c99a46; background: var(--enamel); }
.mf-dial__snd::before { content: ""; width: 9px; height: 9px; margin-right: 6px; border-radius: 50%; border: 1.5px solid currentColor; }
.mf-dial__snd[aria-pressed="true"]::before { background: #c99a46; border-color: #6e4f1c; }
.mf-dial__end:hover, .mf-dial__snd:hover { border-color: #c99a46; }

/* —— 首屏：名字、钟楼、七个时辰 —— */
.c-mumford .c3hero { padding: calc(var(--bar) + 32px) clamp(16px, 4vw, 64px) 36px; }
.mf-hero { max-width: 1320px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .78fr) minmax(0, 1fr); grid-template-areas: "id tower hours";
  gap: 0 clamp(24px, 3.2vw, 52px); align-items: start; }
.mf-id { grid-area: id; padding-top: 6px; }
.mf-k { margin: 0 0 4px; font: 500 14px/1.4 var(--head); letter-spacing: .12em; color: var(--acc); }
.mf-id h1 { margin: 0; font-family: var(--head); font-weight: 900; font-size: clamp(76px, 8.6vw, 132px); line-height: .98; letter-spacing: .03em; }
.mf-en { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 16px; margin: 12px 0 18px; font-family: var(--lat); font-size: 26px; line-height: 1.2; }
.mf-yrs { font-size: 18px; color: var(--ink-3); letter-spacing: .06em; }
.mf-who { margin: 0 0 4px; font: 700 20px/1.5 var(--head); }
.mf-now { margin: 0 0 16px; font-size: 14.5px; color: var(--ink-2); }
.mf-rel { margin: 0 0 16px; padding: 12px 15px 13px; background: rgba(243, 236, 220, .78); border: 1px solid var(--rule); border-radius: 10px; }
.mf-rel .mk { margin: 0 0 4px; font: 700 13px/1.4 var(--head); letter-spacing: .1em; color: var(--acc); }
.mf-rel p { margin: 0; font-size: 15px; line-height: 1.8; }
.mf-go { margin: 0; }
.c-mumford .c3-btn { border-radius: 999px; font-family: var(--head); font-weight: 500; min-height: 40px; padding: 8px 18px; }
.c-mumford .c3-btn--go { background: var(--acc); border-color: var(--acc); color: var(--acc-ink); }
.c-mumford .c3-btn--deep { background: transparent; color: var(--ink); border-color: var(--ink); }
.mf-tower { grid-area: tower; margin: 0; }
.mf-tower img { display: block; width: 100%; height: auto; max-height: calc(100svh - var(--bar) - 130px); object-fit: contain; object-position: center top; }
.mf-tower figcaption, .mf-fig figcaption, .mf-hours__n { margin-top: 10px; font-size: 13px; line-height: 1.65; color: var(--ink-3); }
.mf-hours { grid-area: hours; padding-top: 8px; }
.mf-hours .mk, .mf-books .mk, .mf-band .mk { margin: 0 0 6px; font: 700 13px/1.4 var(--head); letter-spacing: .1em; color: var(--acc); }
.mf-hours ol { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--ink); }
.mf-hours ol a { display: grid; grid-template-columns: 2.6em minmax(0, 1fr) auto; gap: 8px; align-items: baseline; padding: 8px 2px; border-bottom: 1px dotted var(--rule);
  text-decoration: none; font-size: 15px; line-height: 1.45; }
.mf-hours ol b { font-family: var(--num); font-weight: 700; font-size: 16px; color: #6f4c17; }
.mf-hours ol i { font: 500 13px/1 var(--lat); font-style: normal; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.mf-hours ol a:hover span, .mf-hours ol a:focus-visible span { text-decoration: underline; text-underline-offset: 3px; }
.mf-hours__n { margin: 10px 0 18px; }
.mf-books ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 16px; }
.mf-books li { font-size: 15px; }
.mf-books li a { text-decoration: none; border-bottom: 1px solid var(--rule); }
.mf-books li a:hover { border-bottom-color: currentColor; }
.mf-books li i { margin-left: 5px; font: 500 13px var(--lat); font-style: normal; color: var(--ink-3); }
/* 下面一条：像钟盘边上的刻度 */
.mf-band { max-width: 1320px; margin: 40px auto 0; padding-top: 22px; display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, .9fr); gap: 28px;
  background: repeating-linear-gradient(90deg, var(--ink) 0 1px, transparent 1px 14px) top left / 100% 7px no-repeat, linear-gradient(var(--ink), var(--ink)) top left / 100% 1px no-repeat; }
.mf-facts { margin: 0; font-size: 14px; line-height: 1.85; color: var(--ink-2); }
.c-mumford .c3-feats { margin: 0; padding: 0; list-style: none; counter-reset: f; }
.c-mumford .c3-feats li { counter-increment: f; position: relative; padding: 4px 0 5px 26px; border-bottom: 1px dotted var(--rule); font-size: 14px; line-height: 1.6; }
.c-mumford .c3-feats li::before { content: counter(f); position: absolute; left: 0; top: 4px; font: 600 13px/1.6 var(--lat); color: #6f4c17; }
.c-mumford .c3-books li, .c-mumford .c3-links li { font-size: 14px; line-height: 1.55; }

/* —— 每一问：一个时辰 —— */
.c-mumford .c3q { display: block; padding: calc(var(--bar) + 40px) calc(var(--dialw) + 54px) 76px clamp(20px, 5vw, 72px); }
.mf-q { max-width: 1160px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); grid-template-rows: auto auto 1fr;
  grid-template-areas: "head art" "lede art" "rest art"; column-gap: clamp(28px, 4vw, 60px); }
.c-mumford .c3q--2 .mf-q, .c-mumford .c3q--4 .mf-q, .c-mumford .c3q--6 .mf-q { grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); grid-template-areas: "art head" "art lede" "art rest"; }
.mf-q__head { grid-area: head; display: grid; grid-template-columns: auto minmax(0, 1fr); grid-template-areas: "hr when" "h h"; gap: 0 16px; align-items: end; margin: 0 0 16px; }
.mf-q__t { display: contents; }
.mf-q__head .c3q__when { grid-area: when; margin-bottom: 6px; }
.mf-q__head .c3q__q { grid-area: h; }
.mf-hr { grid-area: hr; position: relative; min-width: 1.3em; font-family: var(--num); font-weight: 700; font-size: 84px; line-height: .78; color: var(--gilt); text-align: center; }
.mf-hr i { position: absolute; left: 50%; top: 42%; width: 1.25em; height: 1.25em; margin: -.625em 0 0 -.625em; border-radius: 50%; border: 2px solid var(--gilt); opacity: 0; pointer-events: none; }
.c-mumford .is-in .mf-hr i { animation: mf-strike .85s ease-out .35s var(--n) both; }
@keyframes mf-strike { 0% { transform: scale(.45); opacity: .9; } 96% { transform: scale(1.45); opacity: 0; } 100% { transform: scale(1); opacity: 0; } }
.c-mumford .c3q__when { flex-wrap: wrap; gap: 4px 12px; color: var(--ink-3); font-family: var(--head); font-size: 14px; }
.c-mumford .c3q__when b { font-family: var(--lat); font-weight: 600; font-size: 28px; color: var(--acc); letter-spacing: .02em; }
.c-mumford .c3q__when em { font-style: normal; font-size: 12px; padding: 1px 9px; border-radius: 999px; border: 1px solid var(--rule); color: var(--ink-2); }
.c-mumford .c3q__q { margin: 14px 0 0; font-family: var(--head); font-weight: 900; font-size: clamp(28px, 3.3vw, 44px); line-height: 1.22; letter-spacing: .01em; }
.c-mumford .c3q__q { text-wrap: balance; word-break: keep-all; overflow-wrap: anywhere; }
.mf-nw { white-space: nowrap; }
.mf-q__lede { grid-area: lede; margin: 0 0 6px !important; font-size: 16.5px !important; line-height: 1.95; }
.mf-q__art { grid-area: art; align-self: start; min-width: 0; }
.mf-q__rest { grid-area: rest; min-width: 0; }
.c-mumford .c3-quote { margin: 20px 0 16px; padding: 14px 0 12px; border-left: 0; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--rule); }
.c-mumford .c3-quote blockquote p { font-size: 18.5px; line-height: 1.75; }
.c-mumford .c3-orig { font-family: var(--lat); font-style: italic; font-size: 14.5px; color: var(--ink-2); }
.c-mumford .c3-quote figcaption { color: var(--ink-3); font-size: 12.5px; }
.c-mumford .c3-tags li { border-color: var(--rule); color: var(--ink-2); font-family: var(--head); font-size: 12.5px; }
.c-mumford .c3-works .mk, .c-mumford .c3-talk .mk { font-family: var(--head); font-weight: 700; color: var(--acc); }
.c-mumford .c3-works small, .c-mumford .c3-ask small { color: var(--ink-3); }
.c-mumford .talk { border-color: var(--rule); background: var(--chip-bg); }
.c-mumford .talk__n, .c-mumford .talk__av b { color: var(--ink-3); }
.c-mumford .c3-ask { border-color: var(--rule); border-radius: 10px; }

/* —— 图 —— */
.mf-fig { margin: 0; }
.mf-fig img { display: block; width: 100%; height: auto; }
.mf-fig--bridge img, .mf-fig--potter img, .mf-mega__stage img { mix-blend-mode: multiply; }
.mf-fig--suso, .mf-fig--bridge { display: grid; grid-template-columns: minmax(0, 46%) minmax(0, 1fr); gap: 14px; align-items: end; margin-top: 18px; }
.mf-fig--suso img { border: 1px solid rgba(35, 27, 20, .3); box-shadow: 0 10px 24px rgba(35, 27, 20, .22); }
.mf-fig--suso figcaption, .mf-fig--bridge figcaption { margin: 0; }
.mf-fig--city img { border-radius: 2px; box-shadow: 0 14px 34px rgba(0, 0, 0, .45); }
.mf-fig--door img { box-shadow: 0 18px 40px rgba(16, 22, 28, .28); }

/* —— 机关的共用件 —— */
.mf-sync, .mf-strata, .mf-day, .mf-mag, .mf-tray, .mf-mega__panel { position: relative; }
.mf-sync, .mf-strata, .mf-mag, .mf-tray { padding: 14px 16px 15px; background: var(--paper); border: 1px solid var(--rule); border-radius: 14px; }
.mf-kk { margin: 0 0 10px; font: 700 14px/1.4 var(--head); color: var(--ink); display: flex; align-items: center; gap: 8px; }
.mf-kk::before { content: ""; width: 12px; height: 12px; border-radius: 50% 50% 2px 2px; background: var(--gilt); box-shadow: 0 2px 0 -1px var(--ink); }
.mf-ctl { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.mf-ctl button, .mf-day__go { min-height: 40px; padding: 7px 16px; border: 1.5px solid var(--ink); border-radius: 999px; background: transparent; color: var(--ink);
  font: 500 14.5px/1.3 var(--head); cursor: pointer; transition: background .2s, color .2s; }
.mf-ctl button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.mf-ctl .mf-ctl__go, .mf-day__go { border-color: var(--acc); color: var(--acc); }
.mf-ctl .mf-ctl__go[aria-pressed="true"], .mf-day__go[aria-pressed="true"] { background: var(--acc); color: var(--acc-ink); }
.mf-ctl button:disabled { opacity: .45; cursor: not-allowed; }
.mf-ctl button:not(:disabled):hover, .mf-day__go:hover { box-shadow: 0 0 0 3px var(--rule); }
.mf-out { margin: 10px 0 0; min-height: 3.4em; font-size: 14.5px; line-height: 1.75; color: var(--ink-2); }
.mf-cv { display: block; width: 100%; height: 100%; }

/* 两种时间：敲钟 */
.mf-sync__stage { position: relative; aspect-ratio: 2 / 1; border-radius: 8px; background: linear-gradient(#efe6d3, #e6dac2); border: 1px solid var(--rule); overflow: hidden; }
.mf-sync__clk { position: absolute; right: 10px; top: 8px; margin: 0; padding: 2px 8px; border-radius: 6px; background: rgba(35, 27, 20, .82); color: #f4ecd9;
  font: 600 14px/1.5 var(--lat); font-variant-numeric: tabular-nums; opacity: 0; transition: opacity .4s; }
.mf-sync__clk span { margin-right: 6px; font: 500 11px var(--head); opacity: .8; }
.mf-sync.is-clock .mf-sync__clk { opacity: 1; }

/* 技术的地层 */
.mf-strata__col { position: relative; }
.mf-strata__svg { display: block; width: 100%; height: auto; }
.mf-st { transition: opacity .35s; }
.mf-strata[data-sel] .mf-st { opacity: .3; }
.mf-strata[data-sel="eo"] .mf-st--eo, .mf-strata[data-sel="paleo"] .mf-st--paleo, .mf-strata[data-sel="neo"] .mf-st--neo { opacity: 1; }
.mf-st > g[transform] { transition: transform .5s cubic-bezier(.2, .8, .2, 1); }
.mf-strata__btns { position: absolute; inset: 0; display: grid; grid-template-rows: 32% 34% 34%; }
.mf-strata__b { position: relative; display: flex; flex-direction: column; align-items: flex-start; justify-content: flex-start; gap: 1px; padding: 9px 12px; margin: 0;
  border: 0; background: transparent; text-align: left; cursor: pointer; font: inherit; color: #10161c; }
.mf-strata__b--paleo { color: #efe9df; padding-top: 22px; }
.mf-strata__b--eo { color: #231b14; padding-top: 22px; }
.mf-strata__b b { font: 700 13.5px/1.35 var(--head); padding: 2px 8px; border-radius: 999px; background: rgba(255, 255, 255, .6); }
.mf-strata__b--paleo b { background: rgba(0, 0, 0, .45); }
.mf-strata__b span { font: 500 12.5px/1.4 var(--head); padding: 0 8px; opacity: .85; }
.mf-strata__b[aria-pressed="true"] b { background: var(--gilt); color: #1b140d; }
.mf-strata__b:focus-visible { outline: 3px solid var(--gilt); outline-offset: -3px; }
.mf-fig--bridge { margin-top: 16px; }

/* 下井：昼夜消失 */
.mf-mine { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 20px; align-items: start; }
.mf-mine__view { overflow: hidden; border-radius: 4px; }
.mf-mine__view img { display: block; width: 100%; height: auto; mix-blend-mode: screen; transform-origin: 50% 92%; transition: transform 1.8s cubic-bezier(.45, 0, .2, 1); }
.mf-mine.is-down .mf-mine__view img { transform: scale(1.75); }
.mf-day { padding: 14px 16px 16px; background: var(--paper); border: 1px solid var(--rule); border-radius: 14px; }
.mf-day__dial { display: block; width: 150px; height: 150px; margin: 4px auto 12px; }
.mf-day__d, .mf-day__n { fill: none; stroke-width: 20; transition: stroke 1.2s; }
.mf-day__d { stroke: #e9c77c; } .mf-day__n { stroke: #2d3f55; }
.mf-mine.is-down .mf-day__d, .mf-mine.is-down .mf-day__n { stroke: #121110; }
.mf-day__sun circle { fill: #e9a640; } .mf-day__sun path { stroke: #e9a640; stroke-width: 2; stroke-linecap: round; }
.mf-day__moon { fill: #d7dde6; }
.mf-day__sun, .mf-day__moon { transition: opacity .8s; }
.mf-mine.is-down .mf-day__sun, .mf-mine.is-down .mf-day__moon { opacity: 0; }
.mf-day__shift line { stroke: #e8925a; stroke-width: 2.4; stroke-linecap: round; opacity: 0; transition: opacity .5s; }
.mf-mine.is-down .mf-day__shift line { opacity: .95; }
.mf-day__hand { transform-box: view-box; transform-origin: 70px 70px; animation: mf-spin 14s linear infinite; }
.mf-day__hand line { stroke: var(--ink); stroke-width: 3; stroke-linecap: round; } .mf-day__hand circle { fill: var(--ink); }
@keyframes mf-spin { to { transform: rotate(360deg); } }
.mf-day__go { display: block; margin: 0 auto; }

/* 磁石与容器 */
.mf-fig--city { margin-bottom: 18px; }
.mf-mag__stage { aspect-ratio: 5 / 2; border-radius: 8px; background: radial-gradient(ellipse at 50% 55%, #3a3530, #24211e 70%); border: 1px solid var(--rule); overflow: hidden; }

/* 看见什么 */
.mf-fig--potter { margin-bottom: 16px; }
.mf-tray__grid { list-style: none; margin: 12px 0 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 6px; }
.mf-tray__grid li { display: grid; place-items: center; min-height: 46px; padding: 4px; border: 1px solid var(--rule); border-radius: 8px; font: 500 14.5px/1.3 var(--head);
  color: var(--ink-3); background: transparent; transition: background .35s, color .35s, opacity .35s, border-color .35s; }
.mf-tray[data-eye="tool"] li[data-k="tool"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.mf-tray[data-eye="tool"] li[data-k="vessel"], .mf-tray[data-eye="tool"] li[data-k="later"] { opacity: .5; }
.mf-tray[data-eye="tool"] li[data-k="unseen"] { border-style: dashed; color: transparent; }
.mf-tray[data-eye="vessel"] li[data-k="tool"] { opacity: .5; }
.mf-tray[data-eye="vessel"] li[data-k="vessel"] { background: var(--acc); color: var(--acc-ink); border-color: var(--acc); }
.mf-tray[data-eye="vessel"] li[data-k="later"] { border-color: var(--acc); color: var(--acc); background: rgba(33, 64, 184, .08); }
.mf-tray[data-eye="vessel"] li[data-k="unseen"] { border: 1.5px dashed var(--acc); color: var(--ink); font-style: italic; }

/* 巨机器：人群叠在版画上 */
.mf-mega { margin: 0; }
.mf-mega__stage { position: relative; border-radius: 4px; overflow: hidden; }
.mf-mega__stage img { display: block; width: 100%; height: auto; transition: opacity 1.2s; }
.mf-mega__stage canvas { position: absolute; inset: 0; }
.mf-mega.is-built .mf-mega__stage img { opacity: .28; }
.mf-mega__panel { margin-top: 14px; padding: 14px 16px 15px; background: var(--paper); border: 1px solid var(--rule); border-radius: 14px; }
.mf-mega figcaption { margin-top: 10px; font-size: 13px; line-height: 1.65; color: var(--ink-3); }

/* —— 结尾 —— */
.c-mumford .c3end { padding: calc(var(--bar) + 40px) calc(var(--dialw) + 54px) 64px clamp(20px, 5vw, 72px); }
.mf-end { max-width: 1160px; margin: 0 auto; }
.c-mumford .c3end h2 { font-family: var(--head); font-weight: 900; }
.c-mumford .c3end h3 { font-family: var(--head); }
.c-mumford .c3-lin li { border-radius: 12px; background: var(--paper); border-color: var(--rule); }
.c-mumford .c3-endgo .c3-btn { border-color: var(--ink); }
.c-mumford .c3-credits, .c-mumford .c3-fine { color: var(--ink-3); }

/* —— 响应式 —— */
@media (max-width: 1180px) {
  .c-mumford { --dialw: 150px; }
  .c-mumford .c3toc { right: 12px; }
  .mf-dial { transform: scale(.84); transform-origin: right center; }
  .mf-hero { grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); grid-template-areas: "id tower" "hours tower"; }
  .mf-tower img { max-height: 76svh; }
  .mf-band { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .mf-q, .c-mumford .c3q--2 .mf-q, .c-mumford .c3q--4 .mf-q, .c-mumford .c3q--6 .mf-q { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .mf-mine { grid-template-columns: minmax(0, 1fr); }
  .mf-mine__fig { max-width: 340px; }
}
@media (max-width: 860px) {
  .c-mumford .c3hero { padding-top: calc(var(--bar) + 22px); }
  .mf-hero { grid-template-columns: minmax(0, 1fr) 34%; grid-template-areas: "id id" "hours tower"; gap: 18px; }
  .mf-id h1 { font-size: clamp(64px, 19vw, 96px); }
  .mf-en { font-size: 22px; margin: 8px 0 14px; }
  .mf-tower img { max-height: none; }
  .mf-band { grid-template-columns: minmax(0, 1fr); gap: 20px; margin-top: 28px; }
  .c-mumford .c3q, .c-mumford .c3end { padding: calc(var(--bar) + 28px) 18px 60px; }
  .c-mumford #phases, .c-mumford #city { padding-bottom: 170px; }
  .mf-q, .c-mumford .c3q--2 .mf-q, .c-mumford .c3q--4 .mf-q, .c-mumford .c3q--6 .mf-q { grid-template-columns: minmax(0, 1fr); grid-template-areas: "head" "lede" "art" "rest"; grid-template-rows: none; }
  .mf-q__art { margin: 14px 0 6px; }
  .mf-hr { font-size: 64px; }
  .mf-q__head { gap: 0 12px; }
  .mf-mine { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; }
  .mf-mine__fig { max-width: none; }
}
@media (max-width: 860px) {
  /* 手机上：钟缩成右下角一只怀表，只看指针，不挡点击 */
  .c-mumford .c3toc { display: block; top: auto; bottom: 14px; right: 12px; transform: none; pointer-events: none; }
  .mf-dial, .mf-dial__face, .mf-dial__ring { width: 58px; height: 58px; }
  .mf-dial { transform: none; }
  .c-mumford .c3toc .mf-dial__marks, .c-mumford .c3toc .mf-dial__read, .c-mumford .c3toc .mf-dial__end, .c-mumford .c3toc .mf-dial__snd { display: none; }
  .mf-dial__face { filter: drop-shadow(0 4px 10px rgba(0, 0, 0, .35)); }
}
@media (max-width: 560px) {
  .mf-hero { grid-template-columns: minmax(0, 1fr); grid-template-areas: "id" "hours" "tower"; }
  .mf-tower { max-width: 300px; margin: 6px auto 0; }
  .mf-hours ol a { grid-template-columns: 2.2em minmax(0, 1fr) auto; font-size: 14.5px; }
  .mf-fig--suso, .mf-fig--bridge { grid-template-columns: minmax(0, 44%) minmax(0, 1fr); }
  .mf-mine { grid-template-columns: minmax(0, 1fr); }
  .mf-mine__fig { max-width: 300px; margin: 0 auto; }
  .mf-tray__grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .mf-strata__b b { font-size: 12.5px; }
  .mf-strata__b span { font-size: 11.5px; }
  .c-mumford .c3q__q { font-size: 27px; }
}
@media (prefers-reduced-motion: reduce) {
  .mf-day__hand { animation: none; }
  .mf-mine__view img { transition: none; }
}