/* LTT 学堂 — course-platform hub. Used only by /zh/videos/index.html.
   The 25 episode pages keep style.css untouched. Tokens per the 260828 handoff. */
:root{
  --dark:#39414c; --dark-raise:#454e5b;
  --d-primary:#eef1f5; --d-bright:#f7f9fb; --d-strong:#dde2e9; --d-body:#bcc3cd;
  --d-muted:#a2abb8; --d-dim:#98a2af; --d-label:#8e98a6; --d-faint:#7d8896;
  --page:#eef0f3; --surface:#fbfcfd; --border:#dfe4ea; --border-pill:#d9dfe6; --border-hover:#bfc7d1;
  --ink:#242a33; --body:#4f5763; --second:#616a77; --muted:#7b8493;
  --blue:#6faedc; --link:#2f74a8; --link-hi:#235a85;
  --crim:#d6295c; --crim-hi:#e64371;
  /* crimson as a MARK on the dark rail. #d6295c measures 2.13:1 on --dark, so
     the progress fill and the watched dot were effectively invisible; a fill
     under white text (buttons, pills) still uses --crim. */
  --crim-mark:#F2A0B6;
  --cjk:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --mono:"Space Grotesk","Noto Sans SC",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--page);color:var(--ink);font-family:var(--cjk);-webkit-font-smoothing:antialiased}
a{color:var(--link);text-decoration:none}
a:hover{color:var(--link-hi)}
img{max-width:100%}

/* ---- shell ---- */
.shell{display:grid;grid-template-columns:324px minmax(0,1fr) 336px;align-items:start;min-height:100vh}
.rail{position:sticky;top:0;height:100vh;background:var(--dark);color:var(--d-primary)}
.rail-l{border-right:1px solid rgba(255,255,255,.07);display:flex;flex-direction:column}
.rail-r{border-left:1px solid rgba(255,255,255,.07);overflow-y:auto;padding:28px 26px 40px;display:flex;flex-direction:column;gap:26px}
.centre{min-width:0;padding-bottom:96px;background:var(--page)}

/* ---- left rail ---- */
.rl-head{padding:22px 24px 18px;border-bottom:1px solid rgba(255,255,255,.08);display:flex;flex-direction:column;gap:16px}
.rl-logo{display:flex;align-items:center;gap:10px}
.rl-logo img{height:26px;filter:brightness(0) invert(1)}
.rl-logo span{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--d-muted);white-space:nowrap}
.rl-title{font-size:19px;line-height:1.35;font-weight:700}
.rl-meta{font-family:var(--mono);font-size:12px;color:var(--d-muted);white-space:nowrap}
.rl-meta i{font-style:normal;color:#525b69;padding:0 6px}
.rl-bar{height:4px;background:rgba(0,0,0,.28);border-radius:99px;overflow:hidden}
.rl-bar span{display:block;height:100%;background:var(--crim-mark);border-radius:99px;width:0}   /* 6.73:1 on the track */
.rl-nav{flex:1;overflow-y:auto;padding:8px 12px 32px}
.rl-nav::-webkit-scrollbar{width:8px}
.rl-nav::-webkit-scrollbar-track{background:transparent}
.rl-nav::-webkit-scrollbar-thumb{background:rgba(255,255,255,.14);border-radius:4px}
.rl-grp{padding:14px 12px 8px;display:flex;align-items:baseline;gap:8px}
.rl-grp b{font-size:12px;font-weight:700;letter-spacing:.08em;color:var(--d-strong);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rl-grp em{font-style:normal;font-family:var(--mono);font-size:11px;color:var(--d-dim);flex-shrink:0}
.rl-ep{display:grid;grid-template-columns:20px minmax(0,1fr);gap:10px;padding:8px 12px;border-radius:8px;color:var(--d-body);transition:background .14s,color .14s}
.rl-ep:hover{background:rgba(255,255,255,.06);color:var(--d-bright)}
.rl-dot{width:20px;height:20px;display:grid;place-items:center;color:var(--d-faint);font-size:13px;cursor:pointer;background:none;border:0;padding:0;line-height:1}
.rl-ep.seen .rl-dot{color:var(--crim-mark)}   /* 5.15:1 on --dark */
.rl-k{font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--d-dim)}
.rl-t{font-size:13px;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ---- centre header ---- */
.hd{position:relative;background:var(--surface);padding:56px 56px 40px;border-bottom:1px solid var(--border);overflow:hidden}
.hd .brandrule{position:absolute;inset:0 0 auto 0;height:3px;background:linear-gradient(90deg,var(--blue),var(--crim))}
.hd-star{position:absolute;right:-40px;top:-10px;width:300px;opacity:.07;pointer-events:none}
.hd-in{position:relative;display:flex;flex-direction:column;gap:20px;max-width:840px}
.crumb{font-family:var(--mono);font-size:12px;color:var(--muted)}
.crumb b{font-weight:400;color:var(--ink)}
.hd h1{margin:0;font-size:46px;line-height:1.15;font-weight:900;letter-spacing:-.01em;text-wrap:pretty}
.hd h1 .l{color:var(--crim)}
.eyebrow{display:flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.eyebrow s{display:block;width:26px;height:3px;background:linear-gradient(90deg,var(--blue),var(--crim));text-decoration:none}
.hd p{margin:0;font-size:17px;line-height:1.75;color:var(--body);max-width:64ch;text-wrap:pretty}
.pills{display:flex;flex-wrap:wrap;gap:10px}
.pill{padding:7px 13px;border-radius:99px;font-size:12.5px;border:1px solid var(--border-pill);color:var(--body)}
.pill.on{background:var(--crim);border-color:var(--crim);color:#fff;font-weight:600}

/* ---- designed cover ---- */
.cov{position:relative;aspect-ratio:16/9;background:var(--dark-raise);overflow:hidden}
.cov .rule{position:absolute;inset:0 0 auto 0;height:3px;background:linear-gradient(90deg,var(--blue),var(--crim))}
.cov .lab{position:absolute;left:16px;bottom:14px;display:flex;flex-direction:column;gap:2px}
.cov .lab b{font-family:var(--mono);font-size:30px;font-weight:800;color:#fff;line-height:1;text-shadow:0 1px 10px rgba(15,18,22,.7)}
.cov .lab span{font-size:13px;font-weight:700;color:#e4e9f0;text-shadow:0 1px 8px rgba(15,18,22,.75)}
.cov img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:50% 22%}
/* scrim keeps the EP label readable over a live video frame without covering the face */
.cov .scrim{position:absolute;inset:0;background:linear-gradient(to top,rgba(24,28,34,.92) 0%,rgba(24,28,34,.55) 26%,rgba(24,28,34,.06) 52%,rgba(24,28,34,0) 100%)}
.cov.noframe{background:var(--dark-raise)}
.cov.noframe .scrim{background:none}
.cov .anim{opacity:0;transition:opacity .28s ease;z-index:1}
.cov .anim.on{opacity:1}
@media (prefers-reduced-motion:reduce){.cov .anim{display:none}}
.cov .lab,.cov .rule,.cov .dash{z-index:2}
.cov .scrim{z-index:1}

/* ---- featured ---- */
.feat-w{padding:44px 56px 8px}
.feat-h{display:flex;flex-direction:column;gap:6px;margin-bottom:18px}
.feat-h b{font-family:var(--mono);font-size:13px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.feat-h span{font-size:15px;color:var(--body)}
.feat{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);border-radius:14px;overflow:hidden;background:var(--dark);color:var(--d-primary);transition:background .14s}
.feat:hover{background:var(--dark-raise);color:var(--d-primary)}
.feat .cov .rule{height:4px}
.feat .cov .lab b{font-size:44px}
.feat .cov .lab span{font-size:15px}
.feat .cov .dash{position:absolute;left:16px;bottom:62px;width:38px;height:3px;background:var(--crim)}
.feat-b{padding:36px;display:flex;flex-direction:column;justify-content:center;gap:14px}
.feat-b .k{font-family:var(--mono);font-size:12px;color:var(--blue)}
.feat-b h3{margin:0;font-size:24px;line-height:1.4;font-weight:700}
.feat-b p{margin:0;font-size:14px;line-height:1.7;color:var(--d-body)}
.feat-b time{font-family:var(--mono);font-size:12px;color:var(--d-dim)}

/* ---- sections ---- */
.sec{padding:48px 56px 0;scroll-margin-top:20px}
.sec-h{border-bottom:1px solid var(--border);padding-bottom:22px;margin-bottom:26px;display:flex;flex-direction:column;gap:8px}
.sec-h .row{display:flex;align-items:baseline;gap:12px}
.sec-h h2{margin:0;font-size:24px;font-weight:800;letter-spacing:-.01em}
.sec-h em{font-style:normal;font-family:var(--mono);font-size:12px;color:var(--muted)}
.sec-h p{margin:0;font-size:15px;line-height:1.7;color:var(--body);max-width:70ch}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(268px,1fr));gap:22px}
.card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden;color:inherit;transition:border-color .14s,box-shadow .14s}
.card:hover{border-color:var(--border-hover);box-shadow:0 12px 30px -18px rgba(0,0,0,.35);color:inherit}
.card-b{padding:16px 18px 18px;display:flex;flex-direction:column;gap:9px;flex:1}
.card-b h3{margin:0;font-size:15px;line-height:1.5;font-weight:700}
.card-b p{margin:0;font-size:13px;line-height:1.6;color:var(--second)}
.card-f{margin-top:auto;padding-top:10px;display:flex;justify-content:space-between;font-family:var(--mono);font-size:11.5px;color:var(--muted)}
.card-f .st{color:var(--d-faint)}
.card.seen .card-f .st{color:var(--crim)}

/* ---- right rail ---- */
.cta{padding:22px;border-radius:12px;background:var(--dark-raise);border:1px solid rgba(255,255,255,.08);display:flex;flex-direction:column;gap:16px}
.cta .price{font-family:var(--mono);font-size:30px;font-weight:800;line-height:1}
.cta .sub{font-size:13px;color:var(--d-muted)}
.btn{display:flex;align-items:center;justify-content:center;gap:9px;width:100%;padding:13px 16px;border-radius:9px;font-size:14.5px;font-weight:700;transition:background .14s,border-color .14s}
.btn svg{width:17px;height:17px;fill:currentColor;flex:0 0 auto}
.btn-p{background:var(--crim);color:#fff}
.btn-p:hover{background:var(--crim-hi);color:#fff}
.btn-s{border:1px solid rgba(255,255,255,.18);color:var(--d-primary);font-weight:600}
.btn-s:hover{background:rgba(255,255,255,.06);color:var(--d-primary)}
.cta .blurb{font-size:12.5px;line-height:1.7;color:var(--d-muted)}
.rr-lab{font-family:var(--mono);font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--d-label);margin-bottom:12px}
.who{display:flex;align-items:center;gap:12px}
.who .av{width:44px;height:44px;border-radius:99px;background:#525b69;display:grid;place-items:center;font-family:var(--mono);font-weight:700;color:var(--blue);flex:0 0 auto;overflow:hidden}
.who .av img{width:100%;height:100%;object-fit:cover}
.who b{display:block;font-size:14px;font-weight:600}
.who span{font-size:12px;color:var(--d-muted)}
.jump a{display:flex;justify-content:space-between;gap:10px;padding:11px 13px;border-radius:9px;background:rgba(255,255,255,.04);color:var(--d-strong);font-size:13.5px;margin-bottom:8px;transition:background .14s,color .14s}
.jump a:hover{background:rgba(255,255,255,.09);color:#fff}
.jump em{font-style:normal;font-family:var(--mono);font-size:11.5px;color:var(--d-dim)}
.soc{border-top:1px solid rgba(255,255,255,.08);padding-top:22px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips a{padding:7px 12px;border-radius:7px;border:1px solid rgba(255,255,255,.14);color:var(--d-body);font-size:12px;transition:color .14s,border-color .14s}
.chips a:hover{color:#fff;border-color:rgba(255,255,255,.32)}
.copy{font-size:11px;line-height:1.7;color:var(--d-faint)}

/* inline CTA shown when the right rail is hidden */
.inline-cta{display:none;padding:0 56px;margin-top:44px}
.inline-cta .box{background:var(--dark);color:var(--d-primary);border-radius:14px;padding:26px;display:flex;flex-direction:column;gap:16px}
.inline-cta .btns{display:flex;gap:12px;flex-wrap:wrap}
.inline-cta .btn{width:auto;flex:1 1 220px}
.inline-cta .chips{margin-top:4px}

@media(max-width:1239px){
  .shell{grid-template-columns:288px minmax(0,1fr)}
  .rail-r{display:none}
  .inline-cta{display:block}
}
@media(max-width:899px){
  .shell{grid-template-columns:minmax(0,1fr)}
  /* Below 900px the curriculum was display:none and that was the whole mobile
     story - the course this page exists to sell had no contents list on a phone.
     Same rail, opened as a drawer from a bar at the foot of the screen, matching
     the episode pages. */
  .rail-l{display:none;position:fixed;left:0;top:0;bottom:0;height:auto;z-index:70;
    width:min(86vw,340px);transform:translateX(-100%);box-shadow:0 0 40px rgba(15,18,22,.55)}
  /* Correctness sits on .open, never on an animation finishing: a throttled or
     dropped animation would strand the sheet off screen with the page locked
     behind it, and the reader could not get back. */
  .rail-l.open{display:flex;transform:none;animation:rail-in-l .26s ease}
  .rail-l.open.settled,.rail-scrim.open.settled{animation:none}
  .rail-l.open.closing{animation:rail-out-l .26s ease forwards}
  .rail-l.open .rl-head{padding-right:58px}
  .rail-tabs{display:block}
  body{padding-bottom:calc(54px + env(safe-area-inset-bottom,0px))}
  .rl-dot{position:relative}
  .rl-dot:after{content:"";position:absolute;left:-13px;right:-11px;top:-12px;bottom:-12px}
  .hd{padding:36px 20px 28px}
  .hd h1{font-size:31px}
  .hd-star{width:200px;right:-60px}
  .feat-w,.sec,.inline-cta{padding-left:20px;padding-right:20px}
  .feat{grid-template-columns:minmax(0,1fr)}
  .feat-b{padding:24px}
  .grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
  .inline-cta .btn{flex:1 1 100%}
}

/* ---- header: who this is for --------------------------------------------- */
.hd .series{margin:0;font-size:14px;color:var(--second)}
.hd .series b{color:var(--ink);font-weight:700}
.who{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.who-c{background:var(--page);border:1px solid var(--border);border-left:3px solid var(--crim);
  border-radius:3px;padding:14px 16px}
.who-c b{display:block;font-size:14px;font-weight:700;color:var(--ink);margin-bottom:4px}
.who-c span{display:block;font-size:13px;line-height:1.65;color:var(--second)}
.askline{margin:0;font-size:14px;color:var(--second)}
.askline a{font-weight:700}
@media(max-width:760px){.who{grid-template-columns:1fr}}

/* ---- tell us what to film next ------------------------------------------- */
.ask{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:start;
  background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--crim);
  border-radius:3px;padding:32px 34px;margin:28px 0}
.ask-copy h2{margin:12px 0 10px;font-size:24px;line-height:1.3;font-weight:800;color:var(--ink)}
.ask-copy p{margin:0;font-size:14px;line-height:1.75;color:var(--second)}
.ask-form{display:flex;flex-direction:column;gap:12px}
.fld{display:flex;flex-direction:column;gap:5px}
.fld>span{font-size:12px;font-weight:700;color:var(--ink);letter-spacing:.02em}
.fld>span i{font-style:normal;font-weight:400;color:var(--muted)}
.ask-form textarea,.ask-form input,.ask-form select{
  font-family:var(--cjk);font-size:14px;color:var(--ink);background:#fff;
  border:1px solid var(--border-pill);border-radius:3px;padding:9px 11px;width:100%;resize:vertical}
.ask-form textarea:focus,.ask-form input:focus,.ask-form select:focus{
  outline:none;border-color:var(--crim);box-shadow:0 0 0 3px rgba(214,41,92,.10)}
.ask-form .hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.ask-form button{align-self:flex-start;font-family:var(--cjk);font-size:14px;font-weight:700;
  color:#fff;background:var(--crim);border:0;border-radius:3px;padding:10px 22px;cursor:pointer}
.ask-form button:hover{background:var(--crim-hi)}
.ask-form button:disabled{opacity:.55;cursor:default}
.ask-msg{margin:0;font-size:13px;min-height:1.2em;color:var(--muted)}
.ask-msg.good{color:#1f7a4d;font-weight:700}
.ask-msg.bad{color:var(--crim);font-weight:700}
@media(max-width:760px){.ask{grid-template-columns:1fr;gap:20px;padding:24px 20px}}

/* ---- public topic board -------------------------------------------------- */
.board{grid-column:1/-1;border-top:1px solid var(--border);margin-top:26px;padding-top:20px}
.board-h{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.board-h b{font-size:15px;font-weight:800;color:var(--ink)}
.board-h span{font-size:12px;color:var(--muted)}
.board-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px;
  counter-reset:bd}
.board-list li{display:grid;grid-template-columns:1fr auto;gap:4px 14px;align-items:center}
.board-list .bt{grid-column:1;font-size:13.5px;line-height:1.5;color:var(--ink);counter-increment:bd}
.board-list .bt:before{content:counter(bd);display:inline-block;min-width:18px;font-family:var(--mono);
  font-size:11px;font-weight:700;color:var(--crim);margin-right:6px}
.board-list .br{grid-column:1;height:6px;background:var(--page);border-radius:3px;overflow:hidden}
.board-list .bf{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--crim))}
.board-list .bv{grid-column:2;grid-row:1/3;display:flex;align-items:center;gap:8px;white-space:nowrap}
.board-list .bv b{font-family:var(--mono);font-size:15px;font-weight:800;color:var(--ink);min-width:22px;text-align:right}
.board-list .bv em{font-style:normal;font-size:11px;color:var(--muted)}
.board-list .bv button{font-family:var(--cjk);font-size:11px;font-weight:700;color:var(--crim);
  background:#fff;border:1px solid var(--border-pill);border-radius:999px;padding:4px 11px;cursor:pointer}
.board-list .bv button:hover{border-color:var(--crim);background:#fff5f8}
.board-list .bv button:disabled{opacity:.5;cursor:default}
.board-note{margin:14px 0 0;font-size:11.5px;color:var(--muted)}

/* ---- browse: by chapter, or flat by episode number ----------------------- */
/* One set of nodes, two orders. --o / --r are stamped on every rail row and
   card at build time; CSS `order` sorts them, so switching view never rebuilds
   the DOM and never refetches a cover. */
.rl-view{display:flex;gap:4px;background:rgba(255,255,255,.06);border-radius:8px;padding:3px}
.rl-view button{flex:1;font-family:var(--cjk);font-size:12px;font-weight:700;color:var(--d-muted);
  background:none;border:0;border-radius:6px;padding:7px 6px;cursor:pointer;
  -webkit-user-select:none;user-select:none;transition:background .14s,color .14s}
.rl-view button:hover{color:var(--d-bright)}
.rl-view button[aria-pressed="true"]{background:var(--crim);color:#fff}
.rl-nav.byep{display:flex;flex-direction:column}
.rl-nav.byep .rl-grp{display:none}
.rl-nav.byep .rl-ep{order:var(--o)}
.rl-nav.byep.desc .rl-ep{order:var(--r)}

.browse{display:flex;align-items:center;flex-wrap:wrap;gap:10px;padding:40px 56px 0}
.browse .bl{font-family:var(--mono);font-size:12px;font-weight:700;letter-spacing:.12em;
  text-transform:uppercase;color:var(--muted);margin-right:2px}
.bset{display:flex;gap:4px;background:var(--surface);border:1px solid var(--border);
  border-radius:99px;padding:3px}
.bset[hidden]{display:none}
.bset button{font-family:var(--cjk);font-size:13px;font-weight:700;color:var(--second);
  background:none;border:0;border-radius:99px;padding:7px 15px;cursor:pointer;
  -webkit-user-select:none;user-select:none;transition:background .14s,color .14s}
.bset button:hover{color:var(--ink)}
.bset button[aria-pressed="true"]{background:var(--crim);color:#fff}
#epgrid .card{order:var(--o)}
#epgrid.desc .card{order:var(--r)}

/* ---- featured: step one episode at a time -------------------------------- */
.feat-nav{display:flex;align-items:stretch;gap:12px;margin-top:14px}
/* Solid crimson, identical to the prev/next buttons on the episode pages - the
   step controls are the primary action here, and the faint outlined version
   they replaced was being missed.

   These deliberately use SOP001's canonical #C62F58 / #A12348 rather than this
   file's --crim (#d6295c), which is a slightly lighter house variant from the
   260828 handoff. It is the same control on two pages and must be the same red;
   and white on #d6295c measures 4.85:1 against 5.32:1 on the canonical value.
   That also means .fn darkens on hover where .btn-p lightens to --crim-hi -
   matching the episode-page button wins over matching the CTA button.
   Disabled reuses the file's own --surface / --border / --muted. */
.fn{flex:1 1 0;min-width:0;-webkit-user-select:none;user-select:none;display:flex;flex-direction:column;gap:2px;align-items:flex-start;
  text-align:left;font-family:var(--cjk);background:#C62F58;border:1px solid #C62F58;
  border-radius:10px;padding:12px 16px;cursor:pointer;color:#fff;
  transition:background .14s,border-color .14s,box-shadow .14s}
.fn:hover:not(:disabled){background:#A12348;border-color:#A12348;
  box-shadow:0 10px 24px -14px rgba(198,47,88,.75)}
.fn:disabled{background:var(--surface);border-color:var(--border);color:var(--muted);cursor:default}
.fn-r{text-align:right;align-items:flex-end}
.fn .fn-k{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:#FCE9EF}
.fn:disabled .fn-k{color:var(--muted)}
.fn b{max-width:100%;font-size:14px;font-weight:700;color:#fff;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fn:disabled b{color:var(--muted)}
.fn-all{flex:0 0 auto;display:flex;align-items:center;padding:12px 18px;border-radius:10px;
  border:1px solid var(--border);background:var(--surface);font-size:13px;font-weight:700;
  color:var(--second);text-align:center}
.fn-all:hover{border-color:var(--border-hover);color:var(--ink)}

@media(max-width:899px){
  .browse{padding-left:20px;padding-right:20px}
  .feat-nav{flex-wrap:wrap}
  .fn{flex:1 1 40%}
  .fn-all{order:3;flex:1 1 100%;justify-content:center}
}

/* ---------- the curriculum as a drawer on small screens -------------------- */
@keyframes rail-in-l{from{transform:translateX(-100%)}}
@keyframes rail-out-l{to{transform:translateX(-100%)}}
@keyframes rail-fade{from{opacity:0}}
.rail-x{display:none;position:absolute;top:12px;right:12px;z-index:2;
  width:40px;height:40px;border-radius:50%;border:1px solid rgba(255,255,255,.18);
  background:rgba(255,255,255,.06);color:var(--d-primary);
  font:400 22px/1 var(--mono);cursor:pointer}
.rail-l.open .rail-x{display:block}
.rail-x:hover{background:rgba(255,255,255,.12)}
.rail-x:focus-visible{outline:2px solid var(--crim-mark);outline-offset:2px}
.rail-scrim{display:none;position:fixed;inset:0;z-index:69;background:rgba(15,18,22,.58)}
.rail-scrim.open{display:block;animation:rail-fade .26s ease}
.rail-scrim.open.closing{animation:rail-fade .26s ease reverse forwards}
body.rail-locked{position:fixed;left:0;right:0;width:100%;overflow:hidden}
.rail-tabs{display:none;position:fixed;z-index:72;left:0;right:0;bottom:0;
  background:var(--dark);border-top:1px solid rgba(255,255,255,.10);
  padding-bottom:env(safe-area-inset-bottom,0px)}
.rail-tabs button{width:100%;min-height:54px;display:flex;align-items:center;justify-content:center;
  gap:9px;background:none;border:0;color:var(--d-body);font-family:var(--cjk);font-size:14px;
  font-weight:700;padding:14px 10px;cursor:pointer;-webkit-tap-highlight-color:transparent}
.rail-tabs svg{width:18px;height:18px;fill:currentColor;flex:0 0 auto}
/* --crim is 2.13:1 on --dark; the mark tint is the one that reads */
.rail-tabs button[aria-expanded="true"]{color:#fff;box-shadow:inset 0 -3px 0 var(--crim-mark)}
.rail-tabs button:focus-visible{outline:2px solid var(--crim-mark);outline-offset:-3px}
@media print{.rail-tabs,.rail-scrim{display:none!important}}
@media (prefers-reduced-motion:reduce){
  .rail-l.open,.rail-l.open.closing,.rail-scrim.open,.rail-scrim.open.closing{animation:none}
}

/* Declared after the base rule above, which would otherwise win on order and
   leave the bar display:none on exactly the screens that need it. */
@media(max-width:899px){.rail-tabs{display:block}}

/* ---------- search ---------------------------------------------------------
   61 episodes and roughly four hundred transcript scenes had no way in except
   scrolling. The box searches titles, chapter names, the 重点 list, the FAQ and
   the spoken transcript; a transcript hit deep-links to ?t=<seconds>, so the
   result drops the reader on the sentence rather than at the top of the page.
   Everything but the header and the results hides while a query is active —
   one rule, so it cannot fall out of step when sections are added. */
.centre.searching > *:not(#srch):not(#sres){display:none}

#srch{padding:26px 56px 0}
.srch-box{position:relative;display:flex;align-items:center;
  background:var(--surface);border:1px solid var(--border);border-radius:12px;
  transition:border-color .14s,box-shadow .14s}
.srch-box:focus-within{border-color:var(--crim);box-shadow:0 0 0 3px rgba(214,41,92,.10)}
.srch-box svg{position:absolute;left:16px;width:19px;height:19px;fill:var(--muted);pointer-events:none}
#srchq{flex:1;min-width:0;font-family:var(--cjk);font-size:15.5px;color:var(--ink);
  background:none;border:0;padding:15px 46px 15px 46px;border-radius:12px}
#srchq::placeholder{color:var(--muted)}
#srchq:focus{outline:none}
.srch-x{position:absolute;right:8px;width:32px;height:32px;border:0;border-radius:50%;
  background:none;color:var(--muted);font:400 20px/1 var(--mono);cursor:pointer;display:none}
.srch-box.has .srch-x{display:block}
.srch-x:hover{background:var(--page);color:var(--ink)}
.srch-hint{margin:9px 2px 0;font-size:12.5px;color:var(--second)}   /* --muted is 3.31:1 here */
.srch-hint b{font-weight:400;color:var(--second)}
.srch-hint button{font-family:var(--cjk);font-size:12.5px;color:var(--link);background:none;
  border:0;padding:0 2px;cursor:pointer}
.srch-hint button:hover{color:var(--link-hi);text-decoration:underline}

#sres{padding:26px 56px 0}
.sres-h{font-size:14px;color:var(--second);margin:0 0 16px}
.sres-h b{color:var(--ink)}
.sr{background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--crim);
  border-radius:3px;padding:16px 18px;margin-bottom:12px}
.sr-k{font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;color:var(--second)}
.sr h3{margin:3px 0 0;font-size:16.5px;line-height:1.5;font-weight:700}
.sr h3 a{color:var(--ink)}
.sr h3 a:hover{color:var(--crim)}
.sr-l{display:block;margin-top:9px;padding:8px 11px;border-radius:7px;background:var(--page);
  font-size:13.5px;line-height:1.7;color:var(--second)}
a.sr-l:hover{background:#EEF2F6;color:var(--ink)}
.sr-l em{font-style:normal;font-family:var(--mono);font-size:11px;letter-spacing:.05em;
  color:var(--muted);margin-right:9px;white-space:nowrap}
.sr-l mark{background:#FCE9EF;color:#A12348;font-weight:700;padding:0 2px;border-radius:2px}
.sres-none{background:var(--surface);border:1px solid var(--border);border-radius:12px;
  padding:34px 28px;text-align:center}
.sres-none b{display:block;font-size:16px;color:var(--ink);margin-bottom:6px}
.sres-none span{font-size:14px;color:var(--second)}
@media(max-width:899px){
  #srch,#sres{padding-left:20px;padding-right:20px}
  .sr-l{padding:11px 12px}   /* 45px tap target */
  #srchq{font-size:16px}          /* 16px keeps iOS from zooming the page on focus */
}