:root{
  --paper:#F6F7F9; --surface:#FFFFFF; --ink:#16202B; --muted:#5B6775; --line:#DDE2E8;
  --brand:#0B5FA5; --brand-soft:#E4EEF8; --pin:#F5B301; --pin-ink:#1A1400; --focus:#0B5FA5;
  --radius-lg:14px; --radius-sm:8px;
  --font:"Instrument Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px); padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#0F151C; --surface:#16202A; --ink:#E7ECF1; --muted:#9AA7B4; --line:#263241;
    --brand:#5AA6E8; --brand-soft:#1A2B3C; --focus:#5AA6E8;
  }
}
:root[data-theme="dark"]{
  --paper:#0F151C; --surface:#16202A; --ink:#E7ECF1; --muted:#9AA7B4; --line:#263241;
  --brand:#5AA6E8; --brand-soft:#1A2B3C; --focus:#5AA6E8;
}
*,*::before,*::after{box-sizing:inherit}
html{height:100%;scroll-padding-top:calc(env(safe-area-inset-top,0px) + 72px)}
body{margin:0;min-height:100%;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:16.5px;line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--brand)}
:focus-visible{outline:2px solid var(--focus);outline-offset:2px;border-radius:4px}
img{max-width:100%}

/* layout */
.app{display:grid;grid-template-columns:290px 1fr;min-height:100vh}
.sidebar{position:sticky;top:env(safe-area-inset-top,0px);height:100vh;overflow-y:auto;border-right:1px solid var(--line);background:var(--surface);padding:22px 18px 40px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);margin-bottom:18px}
.vlogo{display:block;height:30px;width:auto;flex:none}
.vlogo .vl-red{fill:#E2231A}.vlogo .vl-ink{fill:var(--ink)}
.brand-div{width:1px;align-self:stretch;background:var(--line);margin:2px 2px}
.topbar .vlogo{height:22px}
.brand-mark{width:34px;height:34px;border-radius:10px;background:var(--brand);display:grid;place-items:center;color:#fff}
.brand b{display:block;font-size:15px;line-height:1.2}
.brand span{display:block;font-size:13px;color:var(--muted)}
.search{position:relative;margin-bottom:18px}
.search input{width:100%;font:inherit;font-size:15px;padding:10px 12px 10px 36px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--paper);color:var(--ink)}
.search svg{position:absolute;left:11px;top:50%;transform:translateY(-50%);color:var(--muted)}
.nav-ch{margin:0 0 4px}
.nav-ch>a{display:flex;gap:10px;align-items:baseline;padding:7px 8px;border-radius:var(--radius-sm);text-decoration:none;color:var(--ink);font-weight:600;font-size:15px}
.nav-ch>a .n{color:var(--muted);font-weight:500;font-variant-numeric:tabular-nums;min-width:1.2em}
.nav-ch>a:hover{background:var(--paper)}
.nav-ch>a[aria-current="page"]{background:var(--brand-soft);color:var(--brand)}
.nav-sc{list-style:none;margin:2px 0 8px;padding:0 0 0 30px}
.nav-sc a{display:flex;justify-content:space-between;gap:8px;padding:4px 8px;font-size:14px;color:var(--muted);text-decoration:none;border-radius:6px}
.nav-sc a:hover{color:var(--ink)}
.dot{width:7px;height:7px;border-radius:50%;flex:none;margin-top:8px;background:var(--line)}
.dot.ready{background:var(--pin)}
.menu-btn{display:none}
.lang-btn{display:flex;align-items:center;gap:8px;width:100%;font:500 14.5px var(--font);color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-sm);padding:9px 12px;cursor:pointer;margin-bottom:12px;text-align:left}
.lang-btn:hover{border-color:var(--brand)}
.flag{display:inline-block;width:21px;height:14px;border-radius:2px;box-shadow:0 0 0 1px rgba(0,0,0,.14);flex:none;object-fit:cover;vertical-align:-2px}
.flag.globe{box-shadow:none;width:16px;height:16px;color:var(--muted)}
.lang-opt .lbl{display:flex;align-items:center;gap:10px;min-width:0}
.lang-chips{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0 2px}
.lang-chip{display:inline-flex;align-items:center;gap:7px;font:500 13.5px var(--font);color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:999px;padding:5px 10px 5px 7px;cursor:pointer}
.lang-chip:hover{border-color:var(--brand)}
.lang-chip:disabled{opacity:.55;cursor:default}
.lang-btn .cur{display:flex;align-items:center;gap:8px;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lang-btn svg{flex:none;color:var(--muted)}
.lang-dialog{position:fixed;inset:0;z-index:60;background:rgba(8,12,18,.55);display:flex;align-items:flex-start;justify-content:center;padding:calc(env(safe-area-inset-top,0px) + 8vh) 16px 24px;overflow-y:auto}
.lang-dialog[hidden]{display:none}
.lang-card{background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:var(--radius-lg);width:min(460px,100%);padding:20px 20px 18px;box-shadow:0 20px 60px -20px rgba(0,0,0,.45)}
.lang-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.lang-head h2{font-size:20px;margin:0}
.lang-x{background:none;border:0;font-size:24px;line-height:1;color:var(--muted);cursor:pointer;padding:4px 8px;border-radius:6px}
.lang-list{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}
.lang-opt{display:flex;align-items:center;justify-content:space-between;gap:10px;width:100%;text-align:left;font:500 15px var(--font);color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-sm);padding:10px 12px;cursor:pointer}
.lang-opt:hover{border-color:var(--brand)}
.lang-opt[aria-current="true"]{border-color:var(--brand);background:var(--brand-soft);color:var(--brand)}
.lang-opt small{font-size:12.5px;color:var(--muted);font-weight:400;white-space:nowrap}
.lang-new label{display:block;font-weight:600;font-size:14.5px;margin-bottom:6px}
.lang-row{display:flex;gap:8px}
.lang-row input{flex:1;min-width:0;font:inherit;font-size:15px;padding:9px 11px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--paper);color:var(--ink)}
.lang-go,.lang-save,.lang-stop{font:600 14.5px var(--font);border-radius:var(--radius-sm);padding:9px 14px;cursor:pointer;border:1px solid var(--brand);background:var(--brand);color:#fff;white-space:nowrap}
.lang-stop{background:transparent;color:var(--ink);border-color:var(--line)}
.lang-go:disabled{opacity:.55;cursor:default}
.lang-hint{font-size:13.5px;color:var(--muted);margin:8px 0 0}
.lang-progress{margin-top:14px}
.lang-bar{height:6px;border-radius:99px;background:var(--line);overflow:hidden;margin-bottom:8px}
.lang-bar span{display:block;height:100%;width:0;background:var(--brand);transition:width .3s}
.lang-status{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:14px}
.lang-owner{margin-top:16px;padding-top:14px;border-top:1px solid var(--line)}
.lang-owner .lang-save{width:100%}
.lang-err{color:#B42318;font-size:14px;margin:10px 0 0}
.topbar .lang-btn{width:auto;margin:0 0 0 auto;padding:7px 10px}
[dir="rtl"] .steps li{direction:rtl}
[dir="rtl"] .tips{border-left:0;border-right:3px solid var(--brand);padding:4px 14px 4px 0}
[dir="rtl"] .stage-intro{margin:0 36px 14px 0}

main{min-width:0;padding:40px clamp(20px,5vw,64px) 96px}
.wrap{max-width:1100px}
.crumbs{font-size:14px;color:var(--muted);margin-bottom:6px}
.crumbs a{color:var(--muted)}
h1{font-size:clamp(30px,4vw,42px);line-height:1.12;letter-spacing:-.015em;margin:0 0 12px;font-weight:700}
h2{font-size:26px;line-height:1.2;letter-spacing:-.01em;margin:0 0 8px}
h3{font-size:21px;line-height:1.25;margin:0 0 6px}
.lede{font-size:18.5px;color:var(--muted);max-width:62ch;margin:0 0 32px}

/* home */
.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;margin-bottom:44px}
.legend{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:22px}
.legend p{margin:0 0 12px;font-size:15px;color:var(--muted)}
.legend-demo{display:flex;gap:14px;align-items:flex-start}
.legend-demo .pin{position:static;transform:none;flex:none}
.chapters{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.chapters li{border-bottom:1px solid var(--line)}
.chapters a{display:grid;grid-template-columns:48px 1fr auto;gap:16px;align-items:baseline;padding:20px 4px;text-decoration:none;color:var(--ink)}
.chapters a:hover h2{color:var(--brand)}
.chapters .n{font-size:26px;font-weight:600;color:var(--muted);font-variant-numeric:tabular-nums}
.chapters p{margin:0;color:var(--muted);max-width:60ch}
.chapters .count{font-size:14px;color:var(--muted);white-space:nowrap}

/* scenario */
.scenario{padding:36px 0;border-top:1px solid var(--line)}
.scenario:first-of-type{border-top:0;padding-top:8px}
.scenario>header p{margin:0 0 20px;color:var(--muted);max-width:66ch}
.shot-wrap{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(260px,1fr);gap:28px;align-items:start}
.shot{position:relative;margin:0;border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line);background:var(--surface);box-shadow:0 1px 2px rgba(16,24,40,.06),0 8px 24px -12px rgba(16,24,40,.18)}
.shot.narrow{max-width:360px;justify-self:center;width:100%}
.shot img{display:block;width:100%;height:auto;cursor:zoom-in}
.shot figcaption{font-size:13.5px;color:var(--muted);padding:8px 12px;border-top:1px solid var(--line)}
.pin{position:absolute;transform:translate(-50%,-50%);width:30px;height:30px;border-radius:50%;border:2px solid #fff;background:var(--pin);color:var(--pin-ink);font:700 14px/1 var(--font);display:grid;place-items:center;cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.35);transition:transform .15s}
.pin.on{transform:translate(-50%,-50%) scale(1.25);box-shadow:0 0 0 6px color-mix(in srgb,var(--pin) 35%,transparent),0 2px 8px rgba(0,0,0,.35)}
.placeholder{aspect-ratio:16/10;display:grid;place-items:center;text-align:center;padding:24px;color:var(--muted);background:repeating-linear-gradient(135deg,var(--paper) 0 12px,var(--surface) 12px 24px)}
.placeholder b{display:block;color:var(--ink);font-size:16px;margin-top:8px}
.steps{list-style:none;margin:0;padding:0;counter-reset:s}
.steps li{display:grid;grid-template-columns:30px 1fr;gap:12px;padding:12px;border-radius:var(--radius-sm);cursor:default}
.steps li.has-pin{cursor:pointer}
.steps li .num{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-weight:700;font-size:13.5px;background:var(--paper);color:var(--muted);border:1px solid var(--line)}
.steps li.has-pin .num{background:var(--pin);color:var(--pin-ink);border-color:transparent}
.steps li.on{background:var(--brand-soft)}
.steps li p{margin:2px 0 0}
.shot-wrap.wide{grid-template-columns:1fr}
.shot-wrap.wide .steps{columns:2 320px;column-gap:24px}
.shot-wrap.wide .steps li{break-inside:avoid}
.stage{margin-top:26px}
.stage:first-of-type{margin-top:0}
.stage h4{display:flex;align-items:center;gap:10px;font-size:17px;margin:0 0 4px}
.stage-n{width:26px;height:26px;border-radius:7px;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:13.5px}
.stage-intro{margin:0 0 14px 36px;color:var(--muted);max-width:66ch}
.tips{margin-top:18px;border-left:3px solid var(--brand);padding:4px 0 4px 14px;font-size:15px}
.tips b{display:block;margin-bottom:2px}
.tips ul{margin:0;padding-left:18px;color:var(--muted)}
.linkcopy{background:none;border:0;color:var(--muted);font:inherit;font-size:13.5px;cursor:pointer;padding:0;margin-left:8px}
.linkcopy:hover{color:var(--brand)}

/* search results */
.results{list-style:none;margin:0;padding:0}
.results li{border-bottom:1px solid var(--line)}
.results a{display:block;padding:16px 4px;text-decoration:none;color:var(--ink)}
.results small{color:var(--muted);display:block}
mark{background:color-mix(in srgb,var(--pin) 45%,transparent);color:inherit;border-radius:3px;padding:0 2px}
.empty{padding:40px 0;color:var(--muted)}

.pager{display:flex;justify-content:space-between;gap:16px;margin-top:40px;padding-top:24px;border-top:1px solid var(--line)}
.pager a{text-decoration:none;display:block;max-width:48%}
.pager small{display:block;color:var(--muted)}
.pager b{color:var(--ink)}

/* lightbox */
.lightbox{position:fixed;inset:0;z-index:50;background:rgba(8,12,18,.88);display:none;align-items:center;justify-content:center;padding:calc(env(safe-area-inset-top,0px) + 56px) 16px calc(env(safe-area-inset-bottom,0px) + 24px)}
.lightbox.open{display:flex}
.lightbox .frame{position:relative;max-width:min(1600px,100%);max-height:100%;overflow:auto}
.lightbox img{display:block;max-width:100%;max-height:calc(100vh - 120px);border-radius:8px}
.lightbox .close{position:fixed;top:calc(env(safe-area-inset-top,0px) + 12px);right:16px;background:#fff;color:#111;border:0;border-radius:999px;padding:8px 16px;font:600 14px var(--font);cursor:pointer}

.toast{position:fixed;bottom:calc(env(safe-area-inset-bottom,0px) + 20px);left:50%;transform:translateX(-50%);background:var(--ink);color:var(--paper);padding:10px 16px;border-radius:999px;font-size:14px;opacity:0;pointer-events:none;transition:opacity .2s}
.toast.show{opacity:1}

@media (max-width:980px){
  .shot-wrap{grid-template-columns:1fr}
  .hero{grid-template-columns:1fr}
}
@media (max-width:820px){
  .app{grid-template-columns:1fr}
  .sidebar{position:fixed;inset:0 auto 0 0;width:min(320px,86vw);z-index:40;transform:translateX(-102%);transition:transform .2s;padding-top:calc(env(safe-area-inset-top,0px) + 22px);height:100%}
  .sidebar.open{transform:none;box-shadow:0 0 0 100vmax rgba(0,0,0,.35)}
  .topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:12px;padding:calc(env(safe-area-inset-top,0px) + 10px) 16px 10px;background:var(--surface);border-bottom:1px solid var(--line)}
  .menu-btn{display:inline-flex;align-items:center;gap:8px;font:600 15px var(--font);background:var(--paper);color:var(--ink);border:1px solid var(--line);border-radius:var(--radius-sm);padding:8px 12px;cursor:pointer}
  main{padding-top:24px}
  .chapters a{grid-template-columns:36px 1fr}
  .chapters .count{display:none}
}
@media (min-width:821px){.topbar{display:none}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* Language switch (English | 日本語) */
.lang-switch{display:flex;gap:4px;padding:3px;background:var(--paper);border:1px solid var(--line);border-radius:10px;margin-bottom:12px}
.lang-switch button{flex:1;display:inline-flex;align-items:center;justify-content:center;gap:7px;font:500 14px var(--font);color:var(--muted);background:transparent;border:0;border-radius:7px;padding:7px 10px;cursor:pointer;white-space:nowrap}
.lang-switch button:hover{color:var(--ink)}
.lang-switch button[aria-pressed="true"]{background:var(--surface);color:var(--ink);box-shadow:0 1px 2px rgba(16,24,40,.08),0 0 0 1px var(--line)}
.topbar .lang-switch{margin:0 0 0 auto;flex:none}
.topbar .lang-switch button{padding:6px 8px;flex:none}
@media (max-width:420px){.topbar .lang-switch button span{display:none}}