/* umwelt — 共通スタイル。色は parallax と同じ系統。
   層の区別は色だけに頼らず、枠線の種類と文字のラベルでも示す。 */
:root{
  --bg:#eef0ec; --panel:#f8f9f6; --ink:#1c2230; --muted:#5d6572; --line:#d3d8d2;
  --accent:#24466e; --accent-ink:#ffffff;
  --in:#2f6fb5; --out:#b8660a; --flat:#8a919c;
  --mid-bg:#fffdf6; --mid-line:#c9b98a;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --bg:#12161d; --panel:#1a2029; --ink:#e4e7ec; --muted:#9aa3b0; --line:#2c3440;
    --accent:#8fb4e6; --accent-ink:#12161d;
    --in:#7fb0ea; --out:#f0a84a; --flat:#6f7783;
    --mid-bg:#231f15; --mid-line:#6b5c33;
  }
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#12161d; --panel:#1a2029; --ink:#e4e7ec; --muted:#9aa3b0; --line:#2c3440;
  --accent:#8fb4e6; --accent-ink:#12161d;
  --in:#7fb0ea; --out:#f0a84a; --flat:#6f7783;
  --mid-bg:#231f15; --mid-line:#6b5c33;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"BIZ UDPGothic","Hiragino Sans","Yu Gothic UI",system-ui,sans-serif;font-size:14px;line-height:1.7}
a{color:var(--accent)}
button{font:inherit;color:inherit}
.wrap{max-width:1320px;margin:0 auto;padding:20px 16px 40px;display:flex;flex-direction:column;gap:16px}

.brand{margin:0;font-family:"Shippori Mincho B1","Yu Mincho",serif;font-weight:800;font-size:15px;letter-spacing:.08em}
.brand span{font-family:inherit;font-weight:600;font-size:12px;color:var(--muted);letter-spacing:0;margin-left:8px}
h1{margin:4px 0 6px;font-family:"Shippori Mincho B1","Yu Mincho",serif;font-weight:800;font-size:clamp(24px,4vw,34px);line-height:1.3;text-wrap:balance}
h1 small{font-size:.5em;font-weight:600;color:var(--muted);margin-left:10px}
.lede{margin:0;max-width:46em;color:var(--muted)}

/* 操作 */
.controls{position:sticky;top:0;z-index:5;background:var(--bg);border-bottom:1px solid var(--line);padding:10px 0 12px;display:grid;grid-template-columns:minmax(0,1.3fr) minmax(240px,1fr) minmax(240px,1fr);gap:12px 28px}
.control{min-width:0}
.control-label{display:block;margin:0 0 6px;font-size:12px;font-weight:700}
.control-label output{font-weight:400;color:var(--muted);font-variant-numeric:tabular-nums}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{min-height:32px;padding:3px 12px;border:1px solid var(--line);border-radius:16px;background:var(--panel);font-size:12px;cursor:pointer;white-space:nowrap}
.chip:hover{border-color:var(--accent)}
.chip:disabled{opacity:.4;cursor:default}
.chip[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:700}
.chip:focus-visible,.card:focus-visible,.panel button:focus-visible,#depth:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
#depth{width:100%;margin:2px 0 0;accent-color:var(--accent)}
.stops{display:grid;grid-template-columns:repeat(5,1fr);font-size:11px;color:var(--muted);line-height:1.3;margin-top:2px}
.stops span{text-align:center}
.stops span:first-child{text-align:left}
.stops span:last-child{text-align:right}
.stops span.on{color:var(--ink);font-weight:700}
.depth-note{margin:6px 0 0;font-size:12px;color:var(--muted);min-height:3.4em}

/* 時間 */
.timebar{display:flex;flex-wrap:wrap;gap:6px}
.timebar .play{min-width:9.5em;font-weight:700}
.control-label output#when{font-variant-numeric:tabular-nums}

/* 図 */
.stage{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:20px;align-items:start}
.diagram{position:relative;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.2fr) minmax(0,1fr);column-gap:clamp(22px,6vw,84px);align-items:start;min-width:0}
#wires{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}
.col{position:relative;min-width:0}
.col h2{margin:0 0 8px;font-size:12px;font-weight:700;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:4px}
.col h2 span{font-weight:400}
.cards{display:flex;flex-direction:column;gap:8px}
.group{display:flex;flex-direction:column;gap:6px;margin-bottom:6px}
.group-name{margin:0;font-size:11px;font-weight:700;color:var(--muted)}
.card{position:relative;scroll-margin-top:12px;display:block;width:100%;text-align:left;padding:7px 9px;border:1px solid var(--line);border-radius:6px;background:var(--panel);cursor:pointer;line-height:1.45;font-size:13px;overflow-wrap:anywhere;transition:opacity .25s}
.card:hover{border-color:var(--accent)}
.card .tag{display:block;font-size:10.5px;color:var(--muted);line-height:1.4}
#col-mid .card{background:var(--mid-bg);border-color:var(--mid-line);border-radius:14px}
#col-mid .card.lvA{border-width:2px;border-style:solid;border-color:var(--ink)}
#col-mid .card.lvB{border-style:solid}
#col-mid .card.lvC{border-style:dashed;border-width:1.5px;border-color:var(--muted)}
#col-mid .card.lvD{border-style:dotted;border-width:2px;border-color:var(--muted)}
.card.sel{box-shadow:0 0 0 3px var(--accent)}
.card.fresh{outline:2px solid var(--out);outline-offset:2px}
.diagram.has-sel .card:not(.sel):not(.rel):not(.off){opacity:.26}
.diagram .card.off{opacity:.18;pointer-events:none}
.diagram.has-sel .card.off{opacity:.06}
.card.enter{animation:enter .45s ease both}
@keyframes enter{from{opacity:0;transform:scale(.94)}to{opacity:1;transform:none}}
.card .past{display:block;font-size:11px;color:var(--muted);line-height:1.4}
.card .flag{display:block;margin-top:2px;font-size:10.5px;font-weight:700;color:var(--muted)}
.card .more{display:block;margin-top:2px;font-size:10.5px;color:var(--accent)}
#col-mid .card.group-card{border-radius:14px;box-shadow:4px 4px 0 -1px var(--mid-bg),4px 4px 0 0 var(--mid-line)}
.group-name.toggle{all:unset;cursor:pointer;font-size:11px;font-weight:700;color:var(--muted);padding:4px 0}
.group-name.toggle:hover{color:var(--accent)}
.group-name.toggle:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.empty-mid{margin:0;padding:14px 10px;border:1px dashed var(--line);border-radius:14px;font-size:12px;color:var(--muted)}

#paths path{fill:none;stroke-width:1.4;opacity:.38;transition:opacity .25s}
#paths path.in{stroke:var(--in);marker-end:url(#m-in)}
#paths path.out{stroke:var(--out);marker-end:url(#m-out)}
#paths path.flat{stroke:var(--flat);marker-end:url(#m-flat)}
#paths path.guess{stroke-dasharray:2 4}
#paths path.miss{stroke:var(--flat);stroke-dasharray:5 4;marker-end:url(#m-miss);opacity:.7}
.diagram.has-sel #paths path{opacity:.07}
.diagram.has-sel #paths path.on{opacity:1;stroke-width:2.2}
.mk-in{fill:var(--in)} .mk-out{fill:var(--out)} .mk-flat{fill:var(--flat)}
.mk-miss{fill:none;stroke:var(--flat);stroke-width:1.8}

/* 詳細 */
.panel{position:sticky;top:170px;max-height:calc(100dvh - 190px);overflow-y:auto;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px;min-width:0}
.panel h2{margin:2px 0 8px;font-family:"Shippori Mincho B1","Yu Mincho",serif;font-weight:800;font-size:19px;line-height:1.5;text-wrap:balance}
.panel h3{margin:16px 0 6px;font-size:12px;font-weight:700;color:var(--muted)}
.panel p{margin:0 0 8px}
.panel .kicker{font-size:12px;color:var(--muted);margin:0}
.panel blockquote{margin:0 0 10px;padding:8px 12px;border-left:3px solid var(--ink);background:var(--bg);font-family:"Shippori Mincho B1","Yu Mincho",serif;font-weight:600;font-size:15px;line-height:1.8;overflow-wrap:anywhere}
.panel blockquote footer{margin-top:6px;font-family:"BIZ UDPGothic","Hiragino Sans",system-ui,sans-serif;font-weight:400;font-size:11px;color:var(--muted);line-height:1.5}
.level{display:inline-block;padding:1px 8px;border:1px solid var(--ink);border-radius:4px;font-size:11px;font-weight:700;margin-right:6px}
.level.lvC{border-style:dashed} .level.lvD{border-style:dotted}
.links{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
.links button{display:block;width:100%;min-height:44px;text-align:left;padding:6px 10px;border:1px solid var(--line);border-radius:6px;background:transparent;cursor:pointer;line-height:1.5}
.links button:hover{border-color:var(--accent)}
.links .why{display:block;font-size:12px;color:var(--muted)}
.links .mark{font-size:11px;font-weight:700}
.links .mark.in{color:var(--in)} .links .mark.out{color:var(--out)} .links .mark.miss{color:var(--muted)}
.states{list-style:none;margin:0;padding:0 0 0 12px;border-left:2px solid var(--line);display:flex;flex-direction:column;gap:10px}
.states li{opacity:.7}
.states li.now{opacity:1}
.states .state-label{font-weight:700;margin:0 0 4px}
.states .cause{font-size:12px;color:var(--muted)}
.remove{min-height:40px;padding:6px 14px;margin:6px 0 4px;border:1px solid var(--ink);border-radius:20px;background:transparent;cursor:pointer;font-size:12px;font-weight:700}
.remove[aria-pressed="true"]{background:var(--ink);color:var(--bg)}
.remove:focus-visible,.reset:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.legend{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px;font-size:12px}
.legend li{display:grid;grid-template-columns:74px minmax(0,1fr);gap:10px;align-items:start}
.legend .swatch{height:24px;border-radius:8px;background:var(--mid-bg);border:1px solid var(--mid-line);font-size:10.5px;text-align:center;line-height:20px}
.legend .swatch.lvA{border:2px solid var(--ink)} .legend .swatch.lvC{border:1.5px dashed var(--muted)} .legend .swatch.lvD{border:2px dotted var(--muted)}
.legend .arrow{height:24px;display:flex;align-items:center;font-weight:700}
.close{display:none}

.outside{font-size:12px;color:var(--muted);min-height:1.7em}
.outside p{margin:0 0 4px}
.reset{min-height:36px;padding:4px 12px;border:1px solid var(--line);border-radius:18px;background:var(--panel);cursor:pointer;font-size:12px}

/* 作り方 */
.method{border-top:1px solid var(--line);padding-top:16px;max-width:52em}
.method h2{margin:0 0 8px;font-size:15px}
.method h3{margin:16px 0 4px;font-size:13px}
.method p,.method li{color:var(--muted);font-size:13px}
.method ul,.method ol{margin:0;padding-left:1.4em}
.method table{border-collapse:collapse;font-size:12px;width:100%}
.method th,.method td{text-align:left;padding:4px 10px 4px 0;border-bottom:1px solid var(--line);color:var(--muted);font-weight:400}
.method th{font-weight:700;color:var(--ink)}
.table-scroll{overflow-x:auto}
.foot{border-top:1px solid var(--line);padding-top:12px;font-size:12px;color:var(--muted)}
.foot p{margin:0}

@media (max-width:1100px){
  .controls{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .controls .control:first-child{grid-column:1 / -1}
}
@media (max-width:1000px){
  .stage{grid-template-columns:minmax(0,1fr)}
  .panel{position:fixed;left:0;right:0;bottom:0;top:auto;z-index:10;max-height:46dvh;border-radius:14px 14px 0 0;border-width:1px 0 0;box-shadow:0 -6px 24px rgba(0,0,0,.18);padding:14px 16px calc(16px + env(safe-area-inset-bottom));display:none}
  .panel.open{display:block}
  .close{display:block;position:sticky;top:0;margin-left:auto;min-width:44px;min-height:36px;border:1px solid var(--line);border-radius:18px;background:var(--panel);cursor:pointer;font-size:12px}
  body.sheet .wrap{padding-bottom:50dvh}
}
@media (max-width:720px){
  .controls{position:static;grid-template-columns:minmax(0,1fr);gap:10px}
  .controls .control:first-child{grid-column:auto}
  .stops{font-size:10px}
  .chips{flex-wrap:nowrap;overflow-x:auto;padding-bottom:4px;scrollbar-width:thin}
  .depth-note{min-height:0}
  .diagram{column-gap:20px;grid-template-columns:minmax(0,1fr) minmax(0,1.25fr) minmax(0,1fr)}
  .card{font-size:11.5px;padding:5px 6px}
  .card .tag{font-size:10px}
  .col h2{font-size:11px}
  .col h2 span{display:none}
}
@media (prefers-reduced-motion:reduce){
  .card,.card.enter,#paths path{animation:none;transition:none}
}

/* ---- 見方の切替 ---- */
.modes{display:flex;gap:4px;margin:6px 0 8px}
.modes a{min-height:32px;display:inline-flex;align-items:center;padding:3px 14px;border:1px solid var(--line);border-radius:16px;background:var(--panel);font-size:12px;text-decoration:none;color:var(--ink)}
.modes a[aria-current="page"]{background:var(--ink);border-color:var(--ink);color:var(--bg);font-weight:700}
.modes a:hover{border-color:var(--accent)}

/* ---- 追体験 ---- */
.trace-controls{grid-template-columns:minmax(0,1.6fr) minmax(280px,1fr)}
.switch{display:inline-flex;align-items:center;gap:6px;margin-top:8px;font-size:12px;color:var(--muted);min-height:32px;cursor:pointer}
.switch input{accent-color:var(--accent);width:16px;height:16px}
.trace-stage{grid-template-columns:minmax(0,1fr) 300px}
.frames{min-width:0;display:flex;flex-direction:column;gap:14px;max-width:46em}
.moment{display:flex;flex-direction:column;gap:8px;opacity:.55;transition:opacity .3s}
.moment:not(.cur) .frame blockquote{display:none}
.moment:not(.cur) .frame .link,.moment:not(.cur) .frame .miss-note{display:none}
.moment:not(.cur) .frame h3{font-size:15px}
.moment:not(.cur) .frame{padding:8px 12px}
.moment.cur{opacity:1}
.moment-date{margin:4px 0 0;font-size:12px;font-weight:700;color:var(--muted);font-variant-numeric:tabular-nums}
.moment.cur .moment-date{color:var(--ink)}
.frame{border:1px solid var(--line);border-radius:10px;background:var(--panel);padding:12px 14px;line-height:1.7}
.frame.intro{background:transparent}
.frame.cur{animation:enter .45s ease both}
.frame h3{margin:2px 0 6px;font-family:"Shippori Mincho B1","Yu Mincho",serif;font-weight:800;font-size:18px;line-height:1.5;text-wrap:balance}
.frame p{margin:0 0 6px}
.frame .frame-kind{font-size:11px;color:var(--muted);margin-bottom:4px}
.kind-mark{display:inline-block;padding:0 8px;border-radius:4px;font-weight:700;font-size:11px;line-height:1.8}
.frame.arrive .kind-mark{background:var(--in);color:#fff}
.frame.act .kind-mark{background:var(--out);color:#fff}
.frame.state{background:var(--mid-bg);border-color:var(--mid-line);border-radius:16px}
.frame.state .kind-mark{background:var(--ink);color:var(--bg)}
.frame.miss{border-style:dashed}
.frame.miss .kind-mark{background:transparent;border:1.5px solid var(--muted);color:var(--muted)}
.frame.miss h3{color:var(--muted)}
.frame .past{font-size:12px;color:var(--muted);margin:0}
.frame .cause{font-size:12px;color:var(--muted)}
.frame .link{font-size:13px;padding-left:10px;border-left:2px solid var(--line)}
.frame .link.guess{border-left-style:dotted}
.frame .miss-note{font-weight:700}
.frame blockquote{margin:6px 0 8px;padding:8px 12px;border-left:3px solid var(--ink);background:var(--bg);font-family:"Shippori Mincho B1","Yu Mincho",serif;font-weight:600;font-size:15px;line-height:1.8;overflow-wrap:anywhere}
.frame blockquote footer{margin-top:6px;font-family:"BIZ UDPGothic","Hiragino Sans",system-ui,sans-serif;font-weight:400;font-size:11px;color:var(--muted);line-height:1.5}
.frame.end{background:transparent;border-style:dashed;color:var(--muted);font-size:12px}
.panel.now{top:150px;max-height:calc(100dvh - 170px)}
.now-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
.now-list li{padding:7px 10px;border:1px solid var(--mid-line);border-radius:12px;background:var(--mid-bg);font-size:13px;line-height:1.45}
.now-list li.lvA{border-width:2px;border-color:var(--ink)}
.now-list li.lvC{border-style:dashed;border-color:var(--muted)}
.now-list li.lvD{border-style:dotted;border-width:2px;border-color:var(--muted)}
.now-list li.undated{opacity:.7}
.now-list .tag{display:block;font-size:10.5px;color:var(--muted)}
@media (max-width:1000px){
  .trace-stage{grid-template-columns:minmax(0,1fr)}
  .panel.now{position:static;max-height:none;display:block;box-shadow:none;border-width:1px;border-radius:10px;padding:14px}
  .trace-page .stage{display:flex;flex-direction:column-reverse}
}
@media (max-width:720px){
  .trace-controls{grid-template-columns:minmax(0,1fr)}
  .frame h3{font-size:16px}
}

.rangebox{margin-top:10px;max-width:520px}
.rangebox input[type=range]{width:100%;accent-color:var(--accent);height:28px;margin:0;cursor:pointer}
.range-ends{display:flex;justify-content:space-between;font-size:11px;color:var(--muted)}

/* 視点：変化と形成の道筋 */
.time-hint{margin:6px 0 0;font-size:12px;color:var(--muted)}
.now-list li.fresh{outline:2px solid var(--out);outline-offset:1px}
.now-list .change-tag{display:block;font-size:11px;font-weight:700;color:var(--muted);margin-bottom:3px}
.now-list .fresh .change-tag{color:var(--out)}
.now-list .past,.now-list .cause{display:block;font-size:11px;color:var(--muted);margin:3px 0}
.formation{margin:8px 0;font-size:12px}
.formation summary{cursor:pointer;color:var(--accent);padding:4px 0}
.formation .kicker{display:block;color:var(--muted);font-size:12px}
.formation summary:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media(prefers-reduced-motion:reduce){.frame.cur,.moment{animation:none;transition:none}}

/* 構造画面：上部を詰め、カードを一行にして図を縦に収める */
.structure-page .wrap{max-width:1600px;gap:10px}
.structure-page .lede{display:none}
.structure-page h1{margin:2px 0 0;font-size:clamp(20px,3vw,26px)}
.structure-page .view-switcher{margin:6px 0 4px}
.structure-page .view-nav a{padding:5px 10px}
.structure-page .view-purpose{font-size:10px}
.structure-page .view-state-bar{margin:6px 0 2px}
.structure-page .controls{position:static;padding:6px 0 8px;gap:8px 24px;grid-template-columns:minmax(0,1.6fr) minmax(300px,1fr)}
.structure-page .control-label{margin-bottom:4px}
.structure-page .chip{min-height:26px;padding:2px 10px;font-size:11.5px}
.structure-page .timebar .play{min-width:8em}
.structure-page .rangebox{margin-top:6px}
.structure-page .rangebox input[type=range]{height:22px}
.structure-page .depth-note{min-height:0;margin-top:4px;font-size:11px}
.structure-page .stage{grid-template-columns:minmax(0,1fr) 320px;gap:16px}
.structure-page .panel{top:12px;max-height:calc(100dvh - 24px)}
.structure-page .diagram{column-gap:clamp(28px,5vw,72px)}
.structure-page .col h2{margin-bottom:6px}
.structure-page .cards{gap:5px}
.structure-page .group{gap:4px;margin-bottom:4px}
.structure-page .card{display:flex;flex-wrap:wrap;align-items:baseline;column-gap:8px;row-gap:1px;padding:4px 9px;font-size:12.5px;line-height:1.4}
.structure-page .card .tag{display:inline;flex:0 0 auto;font-size:10.5px;white-space:nowrap}
.structure-page .card .label{flex:1 1 auto;min-width:0}
.structure-page .card .past{display:block;flex-basis:100%;font-size:10.5px;line-height:1.35}
.structure-page .card .more{display:inline;flex:0 0 auto;margin:0;font-size:10.5px}
.structure-page .card .flag{display:inline;flex:0 0 auto;margin:0}
.structure-page #col-mid .card{border-radius:10px}
.structure-page #col-mid .card.group-card{box-shadow:3px 3px 0 -1px var(--mid-bg),3px 3px 0 0 var(--mid-line)}
.structure-page #col-mid .card.group-card .label{order:-1;font-weight:700}
.structure-page .group-card .past-slot{display:none}
.structure-page #col-mid .cards{position:relative}
.structure-page #col-mid .empty-mid{position:absolute;z-index:2;left:0;right:0;top:0;background:var(--bg);padding:8px 10px}
.structure-page .empty-mid{border-radius:10px}
.structure-page .outside{font-size:11.5px}
@media (max-width:1000px){
  .structure-page .stage{grid-template-columns:minmax(0,1fr)}
  .structure-page .panel{top:auto;max-height:46dvh}
}

/* 時点の表示：すぐ上に、読みやすい色で */
.control-label output#when{color:var(--ink);font-weight:700;margin-left:6px}
.time-note{margin:0 0 8px;min-height:2.9em;font-size:13px;line-height:1.5;color:var(--ink)}
.time-note.idle{color:var(--muted);font-size:12px}
.time-tag{display:inline-block;margin-right:8px;padding:0 8px;border:1px solid var(--accent);border-radius:10px;font-size:11px;font-weight:700;color:var(--accent);white-space:nowrap}
.control-label .hint{font-weight:400;font-size:11px;color:var(--muted);margin-left:6px}

/* 上部の整理：説明文は隠し、根拠の範囲は時間の欄の中に置く */
.trace-page .lede{display:none}
.trace-page .wrap{gap:10px}
.trace-page .view-switcher{margin:6px 0 4px}
.trace-page .view-nav a{padding:5px 10px}
.trace-page .view-purpose{font-size:10px}
.trace-page .controls{position:static;padding:6px 0 8px}

.chip-count{display:inline-block;margin-left:5px;font-size:10px;font-weight:400;opacity:.7;font-variant-numeric:tabular-nums}
.chip[aria-pressed="true"] .chip-count{opacity:.85}
.moment-kinds{display:inline-block;margin-left:10px;font-size:11px;font-weight:400;color:var(--muted)}

/* 時間の操作：バーの両端の語句が「最初へ」「全期間（最後まで）」を兼ね、間に ◀ ▶ を置く */
.range-row{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:4px}
.range-row .timebar{flex-wrap:nowrap}
.range-end{all:unset;cursor:pointer;font-size:12px;color:var(--accent);padding:4px 2px;white-space:nowrap;border-bottom:1px dotted currentColor}
.range-end:hover{color:var(--ink)}
.range-end:disabled{color:var(--muted);border-bottom-color:transparent;cursor:default}
.range-end[aria-pressed="true"]{color:var(--ink);font-weight:700;border-bottom-color:transparent}
.range-end:focus-visible{outline:2px solid var(--accent);outline-offset:2px}