/* Session page · Estación. Same world as home.css: olive paper, one olive rail, flat hairlines, Zen Kaku Gothic New. */
body.session-page {
  --ground:#f6f7f2; --ink:#202420; --muted:#5b6259; --hair:#d9ded4; --hair-strong:#b7c0b0; --rail:#365440; --rail-deep:#2a4333;
  --jp:'Zen Kaku Gothic New','Hiragino Kaku Gothic ProN','Yu Gothic',Meiryo,sans-serif;
  --ease:cubic-bezier(.16,1,.3,1);
  color-scheme:light; background:var(--ground); color:var(--ink); font-family:var(--jp); font-size:17px; line-height:1.6;
  scrollbar-color:var(--hair) var(--ground);
}
.session-page ::selection { background:#dbe5d3; color:var(--ink); }
.session-page a:focus-visible,.session-page summary:focus-visible,.session-page button:focus-visible { outline:3px solid var(--rail); outline-offset:3px; }
.session-page .skip-link { background:var(--ink); color:var(--ground); }
.visually-hidden { position:absolute; width:1px; height:1px; margin:-1px; padding:0; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; border:0; }
.session-page [lang="ja"] { font-family:var(--jp); }

/* Header: signage bar, as on home */
.session-page .site-header { background:var(--ground); border-bottom:1px solid var(--hair); }
.session-page .site-header-inner { max-width:1280px; min-height:68px; padding:0 40px; }
.session-page .site-brand { min-height:44px; gap:10px; font-family:var(--jp); font-size:21px; font-weight:900; letter-spacing:0; }
.session-page .brand-number { width:auto; height:auto; min-width:30px; padding:2px 6px; background:none; color:var(--rail); border:2px solid var(--rail); border-radius:6px; font:700 15px/1.2 var(--jp); font-variant-numeric:tabular-nums; }
.session-page .site-nav { gap:4px; }
.session-page .site-nav a { display:inline-flex; align-items:center; min-height:44px; padding:0 14px; font:500 15px var(--jp); color:var(--muted); border-radius:0; border-bottom:3px solid transparent; }
.session-page .site-nav a[aria-current="page"] { background:none; color:var(--ink); font-weight:700; border-bottom-color:var(--rail); }
.session-page .site-nav a:hover { background:none; color:var(--ink); border-bottom-color:var(--hair); }

.session-shell { max-width:1280px; margin:0 auto; padding:56px 40px 32px; }
.session-shell h1,.session-shell h2,.session-shell h3 { font-family:var(--jp); letter-spacing:0; }
.notice { margin:0 0 32px; padding:14px 0; border-top:1px solid var(--hair-strong); border-bottom:1px solid var(--hair-strong); font-weight:500; }
.notice[hidden] { display:none; }

/* Hero: unit and facts left, station number and day navigation right */
.session-hero { display:grid; grid-template-columns:minmax(0,1.55fr) minmax(340px,1fr); column-gap:clamp(40px,5vw,72px); padding-bottom:40px; }
.session-hero h1 { margin:0 0 18px; font-size:clamp(2.25rem,min(6.6vw,calc(50vw / var(--run,1))),6rem); line-height:1.1; font-weight:900; letter-spacing:-.02em; text-wrap:balance; word-break:auto-phrase; }
.jp-run { white-space:nowrap; }
.session-meta { display:flex; flex-wrap:wrap; gap:4px 20px; margin:0 0 22px; font-size:16px; color:var(--muted); font-variant-numeric:tabular-nums; }
.session-meta span:first-child { color:var(--ink); font-weight:700; }
.session-focus { max-width:58ch; margin:0; font-size:19px; line-height:1.7; color:var(--muted); }
.session-panel { display:flex; flex-direction:column; justify-content:center; padding-left:clamp(28px,3.4vw,48px); border-left:1px solid var(--hair); }
.session-number { margin:0; font-size:clamp(4.5rem,7vw,6rem); font-weight:900; line-height:1; letter-spacing:-.02em; font-variant-numeric:tabular-nums; color:var(--rail); }
.session-date { margin:10px 0 24px; font-size:22px; font-weight:500; text-transform:uppercase; letter-spacing:.02em; }
.session-nav { display:flex; justify-content:space-between; gap:16px; }
.step { display:inline-flex; align-items:center; gap:10px; min-height:44px; padding:0 2px; color:var(--rail); font-weight:700; text-decoration:none; border-bottom:1px solid var(--rail); }
.step:hover { color:var(--rail-deep); border-bottom-color:var(--rail-deep); }
.step[aria-disabled="true"] { color:var(--muted); font-weight:400; border-bottom-color:transparent; cursor:default; }
.arrow { flex:none; }
.step.prev .arrow { transform:scaleX(-1); }

/* Brief: goal and rule */
.session-brief { margin:0; padding:0; border-top:1px solid var(--hair); }
.session-brief div { display:grid; grid-template-columns:11rem minmax(0,1fr); gap:24px; padding:16px 0; border-bottom:1px solid var(--hair); }
.session-brief dt { margin:0; font-size:15px; font-weight:700; color:var(--muted); }
.session-brief dd { margin:0; max-width:70ch; }

/* Blocks: the hour as numbered departures */
.blocks-head { display:flex; flex-wrap:wrap; align-items:baseline; justify-content:space-between; gap:6px 24px; margin:48px 0 8px; }
.blocks-head h2 { margin:0; font-size:28px; font-weight:900; letter-spacing:-.01em; }
.blocks-head p { margin:0; color:var(--muted); font-variant-numeric:tabular-nums; }
.blocks { margin:0; padding:0; list-style:none; }
.block { display:grid; grid-template-columns:6.5rem minmax(15rem,24rem) minmax(0,1fr); grid-template-areas:"time main body" "time links body"; grid-template-rows:auto 1fr; gap:0 clamp(24px,4vw,56px); padding:28px 0; border-top:1px solid var(--hair); }
.block:last-child { border-bottom:1px solid var(--hair); }
.block-time { grid-area:time; align-self:start; }
.block-main { grid-area:main; }
.block-min { display:block; font-size:44px; font-weight:900; line-height:1; letter-spacing:-.02em; font-variant-numeric:tabular-nums; }
.block-unit { display:block; margin-top:4px; font-size:15px; color:var(--muted); }
.block h3 { margin:0 0 6px; font-size:21px; font-weight:700; line-height:1.35; }
.block-label { margin:0 0 10px; font-size:15px; color:var(--muted); }
.block-body { grid-area:body; margin:0; max-width:78ch; padding-top:2px; color:var(--muted); line-height:1.7; white-space:pre-line; }
.block-links { grid-area:links; align-self:start; display:flex; flex-wrap:wrap; align-items:center; gap:4px 28px; margin-top:12px; }
.link { display:inline-flex; align-items:center; gap:8px; min-height:44px; color:var(--rail); font-weight:700; text-decoration:underline; text-decoration-color:var(--rail); text-decoration-thickness:1px; text-underline-offset:.3em; }
.link:hover { color:var(--rail-deep); text-decoration-color:var(--rail-deep); }
/* Closing row */
.finish { display:flex; flex-wrap:wrap; align-items:center; justify-content:flex-end; gap:16px 32px; margin-top:32px; }
.finish[hidden] { display:none; }
.button { display:inline-flex; align-items:center; justify-content:space-between; gap:16px; min-height:54px; padding:0 30px; background:var(--rail); color:var(--ground); font:700 18px var(--jp); text-decoration:none; border-radius:2px; transition:background-color .2s var(--ease); }
.button:hover { background:var(--rail-deep); color:#fbfcf8; }

/* Collapsed entries: unit topics and route notes */
.fold { margin-top:48px; border-top:1px solid var(--hair); border-bottom:1px solid var(--hair); }
.fold + .fold { margin-top:0; border-top:0; }
.fold summary { display:flex; align-items:center; justify-content:space-between; gap:16px; min-height:64px; font-size:19px; font-weight:700; cursor:pointer; list-style:none; }
.fold summary::-webkit-details-marker { display:none; }
.plus { position:relative; flex:none; width:18px; height:18px; }
.plus::before,.plus::after { content:''; position:absolute; background:var(--ink); border-radius:1px; }
.plus::before { left:0; right:0; top:8px; height:2px; }
.plus::after { top:0; bottom:0; left:8px; width:2px; transition:transform .25s var(--ease); }
.fold[open] .plus::after { transform:scaleY(0); }
.fold-body { max-width:74ch; padding:4px 0 32px; }
.fold-body.wide { max-width:none; }
.topics [lang="ja"] { white-space:nowrap; font-size:22px; }
.topics { display:grid; grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr)); gap:0 36px; margin:0; padding:0; list-style:none; }
.topics li { overflow-wrap:break-word; padding:8px 0; border-top:1px solid var(--hair); font-size:19px; font-weight:500; }
.fold-body p { margin:0 0 14px; color:var(--muted); line-height:1.75; }
.fold-body h3 { margin:24px 0 6px; font-size:17px; font-weight:700; }
.fold-body h3:first-child { margin-top:0; }

.session-page .session-footer { font-family:var(--jp); letter-spacing:0; text-transform:none; display:flex; justify-content:flex-end; margin-top:56px; padding-top:20px; border-top:1px solid var(--hair); font-size:15px; color:var(--muted); }

@media (max-width:900px) {
  .session-page .site-header-inner { padding:12px 20px 0; min-height:0; }
  .session-shell { padding:36px 20px 24px; }
  .session-hero { grid-template-columns:minmax(0,1fr); row-gap:32px; }
  .session-hero h1 { font-size:clamp(2.25rem,min(11vw,calc((100vw - 40px) / var(--run,1))),4rem); }
  .session-panel { display:grid; grid-template-columns:auto minmax(0,1fr); column-gap:24px; align-items:center; padding:20px 0 0; border-left:0; border-top:1px solid var(--hair); }
  .session-number { grid-column:1; font-size:clamp(3.5rem,16vw,4.5rem); }
  .session-date { grid-column:1; margin:4px 0 0; font-size:18px; }
  .session-nav { grid-column:2; grid-row:1 / span 2; flex-direction:column; align-items:flex-end; gap:0; }
  .session-brief div { grid-template-columns:1fr; gap:2px; }
  .block { grid-template-columns:4.5rem minmax(0,1fr); grid-template-areas:"time main" "time body" "time links"; grid-template-rows:none; gap:0 16px; padding:24px 0; }
  .block-body { padding-top:0; margin-top:10px; }
  .block-min { font-size:34px; }
  .finish .button { width:100%; }
}
@media (prefers-reduced-motion:reduce) { .button,.plus::after { transition:none; } }
.session-page .route { margin-top:56px; }
.session-brief { margin-top:48px; }