/* FactLens — an investigation told as a book in five chapters. A dark cover under a desk lamp, then pages:
   chapter openers with roman numerals, drop caps, exhibits A–C, a worked deduction, the evidence board, stamps. */
html[data-theme="light"] .mk.p-fl{--bg:#f1ece0;--bg2:#e7e0d0;--fg:#1b2336;--fg2:#4a4d57;--fg3:#7a7462;--line:#d6ccb6;--navy:#1d2f55;--red:#b3262e;--redtx:#a8222a;
  --ok:#2f6b45;--un:#94600f;--card:#fbf8f1;--board:#e2d8c3;--grain:rgba(29,47,85,.05);--spot:rgba(255,250,235,0);--shadow:60,45,20;color-scheme:light}
html[data-theme="dark"] .mk.p-fl{--bg:#0f1626;--bg2:#141d31;--fg:#ece6d6;--fg2:#bab7a9;--fg3:#8f8c7d;--line:#263150;--navy:#a9bde6;--red:#ef5a5f;--redtx:#ff7b7f;
  --ok:#7cc196;--un:#e3b45c;--card:#19233b;--board:#121b2e;--grain:rgba(169,189,230,.05);--spot:rgba(255,232,180,.12);--shadow:0,0,0;color-scheme:dark}
.p-fl{--serif:"Source Serif 4","Noto Serif SC",serif}
.p-fl .pb{background:#f1ece0;color:#0f1626;border:1px solid #f1ece0}
.p-fl .pb2{border:1px solid rgba(241,236,224,.45);color:#f1ece0}
@media (hover:hover){.p-fl .pb:hover{background:#ef5a5f;border-color:#ef5a5f;color:#fff}.p-fl .pb2:hover{border-color:#ef5a5f}}

/* cover — always the dark book cover */
.fl-cover{background:radial-gradient(46% 80% at 74% 30%,rgba(255,232,180,.14),transparent 70%),#0d1424;color:#ece6d6;padding:96px 0 104px;border-bottom:6px double #ef5a5f}
.fl-cover-in{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:48px 80px;align-items:end}
.fl-cover-l{display:flex;flex-direction:column;gap:28px}
.fl-case{font:600 15px/1 "Source Serif 4",serif;letter-spacing:.22em;font-variant-caps:all-small-caps;color:#ff7b7f;display:flex;align-items:center;gap:14px}
.fl-case::before{content:"";width:40px;height:2px;background:#ef5a5f}
.fl-h1{font:700 104px/1.02 var(--serif);letter-spacing:-.02em}
.fl-h1 em{font-style:italic;font-weight:600;color:#ff6b70}
.fl-h1 .zh{font:600 96px/1.18 var(--serif);letter-spacing:.03em}
.fl-h1 .zh em{font-style:normal}
.fl-dek{font:italic 400 21px/1.6 var(--serif);color:#c9c4b4;max-width:34em}
.fl-dek .zh{font-style:normal;font-size:19px;line-height:1.9}
.fl-file{border-top:1px solid rgba(236,230,214,.3)}
.fl-file>div{display:grid;grid-template-columns:90px minmax(0,1fr);gap:14px;padding:12px 0;border-bottom:1px dashed rgba(236,230,214,.22)}
.fl-file dt{font:600 12px/1.7 var(--f-mono);letter-spacing:.14em;text-transform:uppercase;color:#8f8c7d}
.fl-file dt .zh{font-family:"Noto Sans SC",sans-serif;letter-spacing:.3em}
.fl-file dd{font:500 16px/1.5 var(--serif);color:#ece6d6}
.fl-cover .tally.ok{color:#7cc196}.fl-cover .tally.no{color:#ff7b7f}.fl-cover .tally.un{color:#e3b45c}

/* book: rail + reading column */
.p6 .bk{display:grid;grid-template-columns:200px minmax(0,700px);gap:72px;justify-content:center;padding-top:96px}
.p6 .bk-2{padding-top:88px}
.bk-rail{position:sticky;top:100px;align-self:start;display:flex;flex-direction:column;gap:2px;border-left:1px solid var(--line)}
.bk-rail a{display:grid;grid-template-columns:34px minmax(0,1fr);align-items:center;min-height:40px;padding-left:16px;text-decoration:none;color:var(--fg3);font:500 15px/1.3 var(--serif);border-left:2px solid transparent;margin-left:-1px;transition:color .2s,border-color .2s}
.bk-rail a i{font-style:normal;font:600 13px/1 var(--serif);letter-spacing:.06em;color:var(--fg3)}
.bk-rail a.past{color:var(--fg2)}
.bk-rail a.on{color:var(--fg);border-left-color:var(--red)}
.bk-rail a.on i{color:var(--redtx)}
.bk-main{min-width:0}
.ch-h{padding:24px 0 34px;margin-top:72px;border-top:1px solid var(--line);scroll-margin-top:80px}
.bk-main>.ch-h:first-child{margin-top:0;border-top:0;padding-top:0}
.ch-n{display:block;font:600 16px/1 "Source Serif 4",serif;letter-spacing:.24em;font-variant-caps:all-small-caps;color:var(--redtx)}
.ch-n .zh{letter-spacing:.3em}
.ch-t{font:700 58px/1.1 var(--serif);letter-spacing:-.015em;margin-top:14px!important}
.ch-t .zh{font:600 54px/1.25 var(--serif);letter-spacing:.06em}
.bk-p{font:400 19px/1.85 var(--serif);color:var(--fg);margin:0 0 24px!important;text-wrap:pretty}
.bk-p .zh{font-size:18px;line-height:2.05;text-align:justify}
.bk-p.drop>span{display:block}
.bk-p.drop .en::first-letter{float:left;font:700 84px/.8 var(--serif);color:var(--red);margin:8px 12px 0 0}
.bk-p.drop .zh::first-letter{float:left;font:600 64px/1 var(--serif);color:var(--red);margin:6px 12px 0 0}
.bk-small{font:italic 400 15px/1.7 var(--serif);color:var(--fg3);margin-top:12px!important}
.bk-small .zh{font-style:normal}
.bk-note{margin:36px 0;padding:20px 22px;background:var(--bg2);border-left:3px solid var(--red)}
.bk-note-k{display:block;font:600 14px/1 "Source Serif 4",serif;letter-spacing:.18em;font-variant-caps:all-small-caps;color:var(--redtx);margin-bottom:10px}
.bk-note .todo{font:italic 400 16.5px/1.7 var(--serif);color:var(--fg3)}

/* exhibits */
.exhibits{display:flex;flex-direction:column;gap:16px;margin:8px 0 40px!important}
.exhibits li{display:grid;grid-template-columns:56px minmax(0,1fr);gap:18px;background:var(--card);border:1px solid var(--line);padding:20px 22px;position:relative}
.exhibits li::after{content:"";position:absolute;right:16px;top:-6px;width:44px;height:14px;background:color-mix(in srgb,var(--un) 35%,transparent);transform:rotate(3deg)}
.ex-l{font:700 40px/1 var(--serif);color:var(--redtx);border-right:1px solid var(--line)}
.exhibits h3{font:700 19px/1.35 var(--serif)}
.exhibits h3 .zh{font-weight:600}
.exhibits p{font:400 16.5px/1.75 var(--serif);color:var(--fg2);margin-top:6px!important}

/* timeline of the video */
.p6 .tl{margin:0 0 24px;padding:22px 22px 18px;background:var(--card);border:1px solid var(--line)}
.tl-cap{font:600 14px/1.4 "Source Serif 4","Noto Serif SC",serif;letter-spacing:.06em;color:var(--fg2);margin:0 0 34px!important}
.tl-bar{position:relative;height:8px;background:color-mix(in srgb,var(--fg) 10%,transparent);margin:0 6px}
.tl-m{position:absolute;top:50%;transform:translate(-50%,-50%)}
.tl-m i{display:block;width:14px;height:14px;border-radius:50%;border:2px solid var(--card)}
.tl-no i{background:var(--red)}.tl-ok i{background:var(--ok)}.tl-un i{background:var(--un)}
.tl-m b{position:absolute;left:50%;transform:translateX(-50%);font:600 11px/1 var(--f-mono);color:var(--fg2);white-space:nowrap}
.tl-m:nth-child(odd) b{bottom:20px}.tl-m:nth-child(even) b{top:20px}
.tl-ends{display:flex;justify-content:space-between;font:500 12px/1 var(--f-mono);color:var(--fg3);margin-top:28px}

/* worked deduction */
.p6 .ded{margin:8px 0 36px;padding:28px 26px 24px;background:var(--card);border:1px solid var(--line)}
.ded-q{margin:0 0 24px;font:italic 500 22px/1.5 "Source Serif 4",serif;color:var(--fg)}
.ded-x{background:linear-gradient(transparent 62%,color-mix(in srgb,var(--red) 28%,transparent) 62%)}
.ded-split{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.ded-b{padding:16px 18px;border:1px solid var(--line);display:flex;flex-direction:column;gap:6px;border-top:3px solid}
.ded-b.ok{border-top-color:var(--ok)}.ded-b.no{border-top-color:var(--red)}
.ded-k{font:600 12px/1 var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--fg3)}
.ded-b p{font:600 18px/1.4 var(--serif)}
.ded-v{font-size:14.5px;line-height:1.55;color:var(--fg2)}
.ded-b.ok .ded-v{color:var(--ok)}.ded-b.no .ded-v{color:var(--redtx)}
.ded-out{display:flex;align-items:center;gap:20px;margin-top:22px;padding-top:18px;border-top:1px dashed var(--line)}
.ded-out p{font:400 15.5px/1.6 var(--serif);color:var(--fg2)}
.ded-out .stamp{font-size:17px!important;padding:8px 12px!important}

/* stamps and tallies */
.p-fl .stamp{display:inline-block;flex:none;font:700 13px/1 "Source Serif 4","Noto Serif SC",serif;letter-spacing:.14em;text-transform:uppercase;padding:6px 9px 5px;border:2px solid currentColor;transform:rotate(-5deg);white-space:nowrap}
.p-fl .stamp .zh{letter-spacing:.32em;margin-right:-.32em}
.p-fl .st-ok{color:var(--ok)}.p-fl .st-no{color:var(--red)}.p-fl .st-un{color:var(--un)}
.p-fl .tally{display:inline-block;font:600 13.5px/1 var(--f-ui);padding:6px 9px;border-radius:3px;margin:0 6px 6px 0;background:color-mix(in srgb,currentColor 14%,transparent)}
.p-fl .tally.ok{color:var(--ok)}.p-fl .tally.no{color:var(--redtx)}.p-fl .tally.un{color:var(--un)}

/* the evidence board (full width between chapters) */
.p6 .fl-board-wrap{display:grid;grid-template-columns:minmax(0,1fr);gap:24px;margin-top:8px}
.fl-board{position:relative;height:600px;background:var(--board);border:1px solid var(--line);
  background-image:radial-gradient(60% 70% at 50% 50%,var(--spot),transparent 75%),radial-gradient(var(--grain) 1px,transparent 1.5px);background-size:auto,14px 14px;box-shadow:inset 0 0 0 10px color-mix(in srgb,var(--navy) 10%,transparent)}
.fl-strings{position:absolute;inset:0;width:100%;height:100%}
.fl-strings line{stroke:var(--red);stroke-width:1.6;vector-effect:non-scaling-stroke;opacity:.85}
.fl-center{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%) rotate(-1deg);width:300px;background:#1d2f55;color:#f1ece0;padding:20px 22px;display:flex;flex-direction:column;gap:6px;box-shadow:0 18px 30px -16px rgba(0,0,0,.5);z-index:2}
.fl-center .pin-t{color:#c9c4b4}
.fl-center b{font:700 21px/1.25 "Source Serif 4",serif}
.fl-center>span:last-child{font-size:13.5px;opacity:.8}
.pin-t{font:600 12.5px/1 var(--f-mono);letter-spacing:.1em;color:var(--fg3);text-transform:uppercase}
.pin{position:absolute;left:var(--x);top:var(--y);width:250px;text-align:left;cursor:pointer;background:var(--card);color:var(--fg);border:1px solid var(--line);padding:22px 18px 16px;
  display:flex;flex-direction:column;gap:10px;font:inherit;box-shadow:0 2px 4px rgba(var(--shadow),.12),0 16px 26px -16px rgba(var(--shadow),.6);transition:transform .25s cubic-bezier(.2,.8,.2,1);z-index:3}
.pin::before{content:"";position:absolute;top:-8px;left:50%;width:16px;height:16px;margin-left:-8px;border-radius:50%;background:radial-gradient(circle at 35% 35%,#ff8a8a,#b3262e 55%,#5e0d12);box-shadow:0 3px 4px rgba(0,0,0,.35)}
.pin:nth-of-type(odd){transform:rotate(-1.6deg)}.pin:nth-of-type(even){transform:rotate(1.3deg)}
.pin-q{font:600 16.5px/1.4 var(--serif)}
.pin .stamp{align-self:flex-start;font-size:11.5px}
@media (hover:hover){.pin:hover{transform:rotate(0) translateY(-3px)}}
.pin.on{transform:rotate(0) scale(1.04);outline:2px solid var(--red);outline-offset:3px;z-index:4}
.fl-notes{background:var(--card);border:1px solid var(--line);padding:28px 32px;position:relative}
.fl-notes::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--red)}
.fl-note{display:flex;flex-direction:column;gap:14px}
.fl-note-h{display:flex;flex-wrap:wrap;align-items:center;gap:12px 18px}
.fl-conf{font:500 13.5px/1 var(--f-mono);color:var(--fg3)}
.fl-note blockquote{margin:0;font:italic 500 21px/1.5 "Source Serif 4",serif}
.fl-note .bk-p{margin:0!important}
.fl-src{font:400 14px/1.7 var(--f-mono);color:var(--fg3);display:flex;gap:14px;flex-wrap:wrap}
.fl-src>span{font-weight:600;color:var(--fg2)}

/* kit + appendix */
.kit{margin:12px 0 8px;padding:24px 26px;border:1px solid var(--line);background:var(--card)}
.kit h3{font:700 20px/1.35 var(--serif);margin-bottom:12px!important}
.kit dl>div{display:grid;grid-template-columns:110px minmax(0,1fr);gap:14px;padding:12px 0;border-bottom:1px solid var(--line)}
.kit dt{font:700 16px/1.6 var(--serif)}
.kit dd{font:400 16px/1.7 var(--serif);color:var(--fg2)}
.p6 .fl-shot{background:var(--card);padding:14px;border:1px solid var(--line);margin:8px 0 28px;box-shadow:0 30px 60px -36px rgba(var(--shadow),.6)}
.fl-shot img{width:100%;height:auto;border:1px solid var(--line)}
.fl-run{margin-bottom:24px}
.p-fl .end{margin-top:72px}
.p-fl .next b{font:700 40px/1.1 var(--serif)}

@media (max-width:899px){
  .fl-cover{padding:44px 0 64px}
  .fl-cover-in{grid-template-columns:minmax(0,1fr);gap:44px}
  .fl-h1{font-size:58px}.fl-h1 .zh{font-size:54px}
  .fl-dek{font-size:18px}.fl-dek .zh{font-size:17px}
  .p6 .bk,.p6 .bk-2{grid-template-columns:minmax(0,1fr);gap:0;padding-top:56px}
  .bk-rail,.bk-rail-sp{display:none}
  .ch-h{margin-top:48px;padding:20px 0 24px}
  .ch-t{font-size:42px}.ch-t .zh{font-size:40px}
  .bk-p{font-size:17.5px}.bk-p .zh{font-size:16.5px}
  .exhibits li{grid-template-columns:40px minmax(0,1fr);gap:12px;padding:16px}
  .ex-l{font-size:30px}
  .p6 .ded{padding:20px 16px}
  .ded-q{font-size:18px}
  .ded-split{grid-template-columns:minmax(0,1fr)}
  .fl-board{height:auto;display:flex;flex-direction:column;gap:18px;padding:22px 16px 26px 34px;box-shadow:none}
  .fl-board::before{content:"";position:absolute;left:16px;top:30px;bottom:30px;border-left:2px solid var(--red);opacity:.7}
  .fl-strings{display:none}
  .fl-center,.pin{position:relative;left:auto;top:auto;transform:none;width:auto}
  .pin:nth-of-type(odd),.pin:nth-of-type(even),.pin.on{transform:none}
  .fl-notes{padding:22px 18px}
  .kit dl>div{grid-template-columns:minmax(0,1fr);gap:2px}
}