/* =========================================================
   Banto — landing site
   Aesthetic: Edo merchant-house ledger. Ivory paper, ink,
   one vermilion seal (朱). lean · deterministic · conclusion-first.
   ========================================================= */

:root{
  --paper:   #F5F0E6;   /* ivory ledger paper */
  --paper-2: #EFE8DA;   /* tinted band */
  --card:    #FFFDF8;   /* warm white card */
  --ink:     #1C1814;   /* sumi ink */
  --ink-2:   #3A332B;
  --ink-soft:#6B6155;   /* muted */
  --line:    #E2D8C6;   /* hairline */
  --line-2:  #D6C9B2;
  --accent:  #C0392B;   /* 朱 vermilion seal */
  --accent-d:#9E2A1E;
  --accent-t:#F4E2DD;   /* accent tint */
  --green:   #4A7C59;
  --shadow:  0 1px 2px rgba(28,24,20,.05), 0 8px 30px rgba(28,24,20,.07);
  --shadow-l:0 1px 2px rgba(28,24,20,.04), 0 18px 50px rgba(28,24,20,.10);
  --serif: "Iowan Old Style","Palatino Linotype",Palatino,"Hiragino Mincho ProN","Yu Mincho","Songti SC",Georgia,serif;
  --sans: system-ui,-apple-system,"Segoe UI","Hiragino Sans","Yu Gothic UI","Noto Sans JP",Roboto,sans-serif;
  --mono: "SF Mono","JetBrains Mono","Cascadia Code",Menlo,Consolas,monospace;
  --r: 14px;
  --maxw: 1200px;            /* one shared content width for nav / hero / bands / footer */
  --pad: clamp(20px,4vw,40px); /* one shared horizontal gutter so every left edge lines up */
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0; background:var(--paper); color:var(--ink);
  font-family:var(--sans); font-size:17px; line-height:1.65;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
/* subtle paper grain */
body::before{
  content:""; position:fixed; inset:0; z-index:-1; pointer-events:none;
  background:
    radial-gradient(60% 50% at 80% -5%, rgba(192,57,43,.05), transparent 60%),
    radial-gradient(50% 40% at 0% 100%, rgba(74,124,89,.04), transparent 60%);
}

/* ---- bilingual toggle (dual-DOM) ---- */
body[data-lang="en"] .lx[lang="ja"]{ display:none; }
body[data-lang="ja"] .lx[lang="en"]{ display:none; }
/* keep inline lx from breaking flow */
a.lx, span.lx, b.lx, i.lx, h4.lx{ display:inline; }
.fsay .lx, .fdo .lx{ display:inline; }

a{ color:inherit; text-decoration:none; }
h1,h2,h3,h4{ font-family:var(--serif); font-weight:600; line-height:1.12; letter-spacing:-.01em; margin:0; }
em{ font-style:italic; color:var(--accent); }
code{ font-family:var(--mono); font-size:.86em; background:rgba(28,24,20,.05); padding:.08em .35em; border-radius:5px; }

.container{ max-width:var(--maxw); margin:0 auto; padding:0 var(--pad); }
.container.narrow{ max-width:840px; }

/* ===================== READING PROGRESS ===================== */
.progress{ position:fixed; top:0; left:0; right:0; height:3px; z-index:60; background:transparent; }
.progress span{ display:block; height:100%; width:0; background:linear-gradient(90deg,var(--accent),var(--accent-d)); transition:width .1s linear; }

/* ===================== NAV ===================== */
.nav{
  position:sticky; top:0; z-index:50;
  background:rgba(245,240,230,.82); backdrop-filter:saturate(140%) blur(12px);
  border-bottom:1px solid transparent; transition:border-color .3s, background .3s;
}
.nav-inner{
  display:flex; align-items:center; gap:22px;
  max-width:var(--maxw); margin:0 auto; padding:14px var(--pad);
  transition:padding .3s;
}
.nav.scrolled{ border-color:var(--line); }
.nav.scrolled .nav-inner{ padding-top:10px; padding-bottom:10px; }
.brand{ display:flex; align-items:center; gap:10px; font-family:var(--serif); font-weight:600; font-size:20px; white-space:nowrap; }
.brand-word{ display:flex; align-items:baseline; gap:6px; }
.brand-kanji{ font-size:13px; color:var(--ink-soft); letter-spacing:.08em; }
.seal{
  display:grid; place-items:center; width:34px; height:34px; flex:none;
  color:#fff; background:var(--accent); border-radius:8px;
  font-family:var(--serif); font-size:19px; box-shadow:inset 0 0 0 2px rgba(255,255,255,.25), var(--shadow);
  transform:rotate(-3deg);
}
.seal.small{ width:30px; height:30px; font-size:17px; }
.nav-links{ display:flex; gap:6px; margin-left:8px; }
.nav-links a{ font-size:14.5px; color:var(--ink-soft); padding:6px 11px; border-radius:8px; transition:color .2s, background .2s; }
.nav-links a:hover{ color:var(--ink); background:rgba(28,24,20,.05); }
.nav-right{ margin-left:auto; display:flex; align-items:center; gap:14px; }
.lang-toggle{ display:inline-flex; background:rgba(28,24,20,.05); border:1px solid var(--line); border-radius:9px; padding:2px; }
.lang-toggle button{
  font:inherit; font-size:13px; font-weight:600; cursor:pointer; border:0; background:transparent;
  color:var(--ink-soft); padding:5px 10px; border-radius:7px; transition:.2s; white-space:nowrap;
}
@media(max-width:430px){ .nav-inner{ gap:10px; } .gh span{ display:none; } }
.lang-toggle button.on{ background:var(--card); color:var(--ink); box-shadow:var(--shadow); }
.gh{ display:inline-flex; align-items:center; gap:7px; font-size:14px; font-weight:600; padding:7px 14px; border:1px solid var(--line-2); border-radius:9px; transition:.2s; }
.gh:hover{ border-color:var(--ink); background:var(--ink); color:var(--paper); }
/* mid range: tighten so brand + links + controls never collide */
@media(max-width:1000px){
  .nav-inner{ gap:12px; }
  .nav-links{ gap:2px; margin-left:0; }
  .nav-links a{ font-size:13.5px; padding:6px 8px; }
}

/* ===================== HAMBURGER (narrow screens) ===================== */
.nav-burger{
  display:none; width:38px; height:38px; flex:none;
  border:1px solid var(--line-2); border-radius:9px; background:transparent;
  cursor:pointer; place-items:center; padding:0;
}
.nav-burger span{ position:relative; display:block; width:16px; height:2px; background:var(--ink); border-radius:1px; transition:background .15s; }
.nav-burger span::before, .nav-burger span::after{
  content:""; position:absolute; left:0; width:16px; height:2px; background:var(--ink); border-radius:1px; transition:transform .2s;
}
.nav-burger span::before{ top:-5px; }
.nav-burger span::after{ top:5px; }
.nav.menu-open .nav-burger span{ background:transparent; }
.nav.menu-open .nav-burger span::before{ transform:translateY(5px) rotate(45deg); }
.nav.menu-open .nav-burger span::after{ transform:translateY(-5px) rotate(-45deg); }

@media(max-width:820px){
  .nav-burger{ display:grid; }
  .nav-links{ display:none; }
  /* tap the burger → a full-width drawer with every menu expanded inline */
  .nav.menu-open .nav-links{
    display:flex; flex-direction:column; align-items:stretch; gap:0;
    position:absolute; top:100%; left:0; right:0;
    background:var(--card); border-bottom:1px solid var(--line);
    box-shadow:var(--shadow-l); padding:8px 18px 20px;
    max-height:calc(100vh - 62px); overflow-y:auto;
  }
  .nav.menu-open .nav-item{ display:block; }
  .nav.menu-open .nav-links > a,
  .nav.menu-open .nav-item > a{ display:inline-block; font-size:16px; font-weight:700; color:var(--ink); padding:10px 0 4px; }
  .nav.menu-open .nav-menu{
    position:static; transform:none; opacity:1; visibility:visible; pointer-events:auto;
    display:grid; grid-template-columns:1fr; gap:2px;
    border:0; box-shadow:none; border-radius:0; background:transparent;
    padding:0 0 8px 14px; margin:0; max-height:none; max-width:none;
    transition:none;
  }
  .nav.menu-open .nav-menu::before{ display:none; }
  /* the display override above must not resurrect the hidden language */
  body[data-lang="en"] .nav.menu-open .lx[lang="ja"]{ display:none; }
  body[data-lang="ja"] .nav.menu-open .lx[lang="en"]{ display:none; }
}

/* ===================== BUTTONS ===================== */
.btn{ display:inline-flex; align-items:center; gap:8px; font-size:15.5px; font-weight:600; padding:12px 22px; border-radius:11px; cursor:pointer; transition:transform .15s, box-shadow .2s, background .2s, border-color .2s; }
.btn-primary{ background:var(--accent); color:#fff; box-shadow:var(--shadow); }
.btn-primary:hover{ background:var(--accent-d); transform:translateY(-2px); box-shadow:var(--shadow-l); }
.btn-ghost{ border:1px solid var(--line-2); color:var(--ink); }
.btn-ghost:hover{ border-color:var(--ink); transform:translateY(-2px); }
.btn.lg{ padding:15px 30px; font-size:16.5px; }
.flag-more{ display:inline-flex; align-items:center; gap:6px; margin-top:18px; font-size:14.5px; font-weight:600; color:var(--accent-d); border-bottom:1px solid var(--line-2); padding-bottom:2px; transition:gap .2s, border-color .2s; }
.flag-more:hover{ border-color:var(--accent-d); gap:9px; }

/* ===================== HERO ===================== */
.hero{ padding:clamp(40px,7vw,86px) var(--pad) 30px; max-width:var(--maxw); margin:0 auto; }
.hero-grid{ display:grid; grid-template-columns:1.05fr .95fr; gap:clamp(24px,5vw,60px); align-items:center; }
.hero-grid > *{ min-width:0; } /* nowrap の hero-install がカラムの縮小下限を押し上げ、375px で 67px はみ出すのを防ぐ */
.eyebrow{ display:inline-flex; align-items:center; gap:9px; font-size:13.5px; font-weight:600; letter-spacing:.04em; color:var(--ink-soft); text-transform:uppercase; }
.eyebrow .dot{ width:8px; height:8px; border-radius:50%; background:var(--green); box-shadow:0 0 0 4px rgba(74,124,89,.16); animation:pulse 2.4s ease-in-out infinite; }
@keyframes pulse{ 50%{ box-shadow:0 0 0 7px rgba(74,124,89,0); } }
.hero h1{ font-size:clamp(38px,6vw,68px); margin:18px 0 0; letter-spacing:-.02em; }
.hero h1 em{ font-style:italic; }
.lede{ font-size:clamp(17px,2vw,20px); color:var(--ink-2); max-width:36em; margin:22px 0 0; }
.lede strong{ color:var(--ink); }
.hero-cta{ display:flex; gap:14px; margin:30px 0 0; flex-wrap:wrap; }
.hero-install{
  display:block; margin:22px 0 0; position:relative;
  font-family:var(--mono); font-size:13.5px; background:var(--ink); color:#F3ECDD;
  padding:13px 16px; border-radius:11px; cursor:pointer; box-shadow:var(--shadow); overflow:hidden;
  white-space:nowrap; text-overflow:ellipsis;
}
.hero-install .prompt{ color:var(--accent); margin-right:8px; }
.copy-hint{ position:absolute; right:12px; top:50%; transform:translateY(-50%); font-family:var(--sans); font-size:11px; color:#9A9082; opacity:.7; }
.hero-install:hover .copy-hint{ opacity:1; }
.cmd.copied::after, .hero-install.copied .copy-hint{ content:""; }

/* hero art */
.hero-art{ position:relative; }
.hero-art-caption{ text-align:center; font-size:13px; color:var(--ink-soft); margin-top:6px; letter-spacing:.02em; }
@media(max-width:900px){ .hero-grid{ grid-template-columns:1fr; } .hero-art{ order:-1; max-width:420px; margin:0 auto; } }

/* stat strip */
.stat-strip{ display:flex; flex-wrap:wrap; gap:clamp(18px,4vw,52px); justify-content:center; margin:clamp(40px,6vw,72px) auto 0; padding:26px; max-width:920px; background:var(--card); border:1px solid var(--line); border-radius:18px; box-shadow:var(--shadow); }
.stat{ display:flex; flex-direction:column; align-items:center; min-width:74px; }
.stat b{ font-family:var(--serif); font-size:clamp(30px,4vw,42px); line-height:1; color:var(--accent); }
.stat .unit{ font-size:14px; color:var(--ink-soft); margin-left:3px; }
.stat span{ font-size:13px; color:var(--ink-soft); margin-top:7px; letter-spacing:.03em; }

/* ===================== BANDS ===================== */
/* keep anchored sections clear of the sticky nav on jump-links */
section[id], article[id]{ scroll-margin-top:80px; }
.band{ padding:clamp(56px,9vw,118px) 0; border-top:1px solid var(--line); }
.band-tint{ background:var(--paper-2); }
.band-ink{ background:var(--ink); color:#EDE6D8; border-top-color:#2a241d; }
.band-ink .seal{ box-shadow:inset 0 0 0 2px rgba(255,255,255,.25); }
.kicker{ font-size:13px; font-weight:700; letter-spacing:.13em; text-transform:uppercase; color:var(--accent); margin:0 0 14px; }
.kicker.center{ text-align:center; }
.kicker.light{ color:#E9A79E; }
.band h2{ font-size:clamp(28px,4vw,44px); max-width:18ch; text-wrap:balance; }
.band h2.center{ margin-inline:auto; text-align:center; max-width:22ch; }
.band h2.light{ color:#FBF6EC; }
.section-lede{ font-size:clamp(16px,1.6vw,18.5px); color:var(--ink-soft); max-width:60ch; margin:18px 0 0; }
.section-lede.center{ margin-inline:auto; text-align:center; }
.section-lede.light{ color:#C9C0AF; }
.prose{ margin-top:24px; }
.prose p{ font-size:18px; color:var(--ink-2); max-width:62ch; margin:0 0 18px; }
.prose em{ font-style:italic; }

/* north star quote */
.northstar{ margin:40px 0 0; padding:30px 34px; background:var(--card); border-left:4px solid var(--accent); border-radius:0 14px 14px 0; box-shadow:var(--shadow); }
.northstar blockquote{ margin:0; font-family:var(--serif); font-size:clamp(20px,2.6vw,27px); line-height:1.3; font-style:italic; }
.northstar figcaption{ margin-top:14px; font-size:14px; color:var(--ink-soft); font-style:normal; }

/* ===================== DIAGRAM SHARED ===================== */
.diagram{ width:100%; height:auto; overflow:visible; }
.diagram text{ font-family:var(--sans); fill:var(--ink); }
.n-title{ font-size:14px; font-weight:700; text-anchor:middle; }
.n-title.sm{ font-size:12px; }
.n-sub{ font-size:11px; fill:var(--ink-soft); text-anchor:middle; }
.n-sub2{ font-size:9.5px; fill:var(--ink-soft); text-anchor:middle; }
.n-sub2.warn{ fill:var(--accent); font-weight:700; }
.n-sub.strong{ fill:var(--accent); font-weight:700; }
.edge-label{ font-size:11px; fill:var(--ink-soft); }
.edge-label.mid{ text-anchor:middle; }

/* node draw-in */
.node rect, .node circle,
.lp-node rect, .ctx-store rect, .ctx-sess rect, .ctx-repo rect,
.lp-manifest rect, .lp-gate rect{
  fill:var(--card); stroke:var(--line-2); stroke-width:1.5;
}
.node-banto rect{ fill:var(--accent); stroke:var(--accent-d); }
.node-banto text{ fill:#fff; }
.node-banto .n-sub, .node-banto .n-sub2{ fill:rgba(255,255,255,.82); }
.node-owner circle{ fill:var(--ink); stroke:var(--ink); }
.node-owner text{ fill:#F3ECDD; }
.node-owner .n-sub{ fill:rgba(243,236,221,.7); }

/* flow paths (drawn on .in) */
.flow,.lp-flow,.ctx-flow,.ws-arc,.loop-run{
  fill:none; stroke:var(--accent); stroke-width:2;
  stroke-dasharray:var(--len,300); stroke-dashoffset:var(--len,300);
}
.ws-arc{ stroke:var(--line-2); }
.ws-arc.merge{ stroke:var(--green); stroke-dasharray:6 5; }
.flow-exc{ stroke:var(--ink-soft); stroke-dasharray:5 5; }
.ctx-flow{ stroke:var(--accent); }
.diagram.in .flow,
.diagram.in .lp-flow,
.diagram.in .ctx-flow,
.diagram.in .ws-arc,
.diagram.in .loop-run{ animation:draw 1.1s ease forwards; }
.diagram.in .flow-2{ animation-delay:.5s; }
.diagram.in .flow-exc{ animation-delay:1.1s; animation-duration:1.4s; }
.diagram.in .f2{ animation-delay:.45s; }
.diagram.in .f3{ animation-delay:.9s; }
.diagram.in .f-man{ animation-delay:.7s; stroke-dasharray:4 4; }
.diagram.in .w2{ animation-delay:.6s; }
.diagram.in .w3{ animation-delay:1s; }
@keyframes draw{ to{ stroke-dashoffset:0; } }

/* node fade/scale stagger */
.node,.lp-node,.ctx-store,.ctx-sess,.ctx-repo,.exc-badge,.ws-dot{
  opacity:0; transform:translateY(8px) scale(.96); transform-origin:center; transform-box:fill-box;
  transition:opacity .55s ease, transform .55s cubic-bezier(.2,.8,.25,1);
}
.diagram.in .node,.diagram.in .lp-node,.diagram.in .ctx-store,
.diagram.in .ctx-sess,.diagram.in .ctx-repo,.diagram.in .exc-badge,.diagram.in .ws-dot{ opacity:1; transform:none; }
.diagram.in .node-banto{ transition-delay:.25s; }
.diagram.in .node-agent{ transition-delay:.6s; }
.diagram.in .a2{ transition-delay:.72s; } .diagram.in .a3{ transition-delay:.84s; }
.diagram.in .exc-badge{ transition-delay:1.6s; }
.diagram.in .lp-llm{ transition-delay:.2s; } .diagram.in .lp-en{ transition-delay:.4s; }
.diagram.in .lp-manifest{ transition-delay:.6s; } .diagram.in .lp-gate{ transition-delay:.8s; }
.diagram.in .s2{ transition-delay:.5s; } .diagram.in .ctx-repo{ transition-delay:.9s; }
.exc-badge rect{ fill:var(--ink); }
.diagram .exc-text{ fill:#F3ECDD; font-size:11px; font-weight:700; text-anchor:middle; }

/* ws dots stagger */
.ws-line{ stroke-width:3; stroke-linecap:round; opacity:0; transition:opacity .5s; }
.ws-main{ stroke:var(--ink); } .ws-epic{ stroke:var(--accent); } .ws-task{ stroke:var(--green); }
.diagram.in .ws-line{ opacity:1; }
.branch-label{ font-size:11px; fill:var(--ink-soft); font-weight:600; }
.branch-label.gate-lbl{ text-anchor:end; fill:var(--accent); }
.ws-dot{ fill:var(--ink); }
.ws-dot.gate{ fill:var(--accent); }
.diagram.in .ws-dot.d2{ transition-delay:.3s;} .diagram.in .ws-dot.d3{ transition-delay:.5s;}
.diagram.in .ws-dot.d4{ transition-delay:.7s;} .diagram.in .ws-dot.d5{ transition-delay:.9s;}
.diagram.in .ws-dot.d6{ transition-delay:1.1s;}

/* ===================== FLAGSHIPS ===================== */
.flag-index{ display:flex; flex-wrap:wrap; justify-content:center; gap:12px; margin:34px auto 8px; }
.flag-index a{ display:flex; align-items:center; gap:8px; font-size:14.5px; font-weight:600; color:var(--ink-2); background:var(--card); border:1px solid var(--line); padding:9px 16px; border-radius:30px; box-shadow:var(--shadow); transition:.2s; }
.flag-index a:hover{ border-color:var(--accent); color:var(--accent); transform:translateY(-2px); }
.flag-index b{ color:var(--accent); font-family:var(--serif); }

.flagship{ margin:clamp(34px,5vw,60px) 0 0; padding:clamp(26px,3.5vw,42px); background:var(--card); border:1px solid var(--line); border-radius:22px; box-shadow:var(--shadow); }
.flagship-star{ border-color:var(--accent); box-shadow:0 0 0 1px var(--accent-t), var(--shadow-l); position:relative; }
.flagship-star::before{
  content:"★"; position:absolute; top:-13px; right:24px;
  width:30px; height:30px; display:grid; place-items:center;
  background:var(--accent); color:#fff; border-radius:50%; font-size:15px;
  box-shadow:var(--shadow); transform:rotate(-6deg);
}
.flag-head{ display:flex; align-items:flex-start; gap:18px; margin-bottom:8px; }
.flag-num{ font-family:var(--serif); font-size:clamp(34px,5vw,52px); color:var(--accent); line-height:.9; opacity:.85; flex:none; }
.flag-head h3{ font-size:clamp(23px,3vw,31px); }
.flag-tag{ margin:8px 0 0; color:var(--ink-soft); font-size:16px; }
.flag-body{ display:grid; grid-template-columns:1.15fr .85fr; gap:clamp(22px,4vw,44px); align-items:center; margin-top:26px; }
.flag-body.reverse .flag-text{ order:2; }
.flag-text p{ font-size:16.5px; color:var(--ink-2); margin:0 0 16px; }
.ticks{ list-style:none; padding:0; margin:0; }
.ticks li{ position:relative; padding-left:26px; margin:0 0 10px; font-size:15px; color:var(--ink-2); }
.ticks li::before{ content:"✓"; position:absolute; left:0; top:0; color:var(--accent); font-weight:700; }
.flag-art{ display:flex; align-items:center; justify-content:center; }
@media(max-width:840px){ .flag-body,.flag-body.reverse{ grid-template-columns:1fr; } .flag-body.reverse .flag-text{ order:0; } }

/* star section internals */
.star-intro{ font-size:18px; color:var(--ink-2); max-width:74ch; margin:22px 0 0; }
.star-intro strong{ color:var(--ink); }
.lang-pipeline{ margin:30px auto; max-width:920px; overflow-x:auto; }
.lp-node.lp-gate rect{ stroke:var(--accent); stroke-width:2; }
.lp-node.lp-ja rect{ stroke:var(--ink); }
.lp-node.lp-llm rect{ fill:var(--paper-2); stroke-dasharray:5 4; }
.lp-manifest rect{ fill:rgba(28,24,20,.04); }

.lang-steps{ display:grid; grid-template-columns:repeat(2,1fr); gap:16px; margin-top:10px; }
.lstep{ position:relative; padding:22px 22px 22px 22px; background:var(--paper-2); border:1px solid var(--line); border-radius:15px; }
.lstep-n{ display:grid; place-items:center; width:30px; height:30px; border-radius:8px; background:var(--accent); color:#fff; font-family:var(--serif); font-weight:700; margin-bottom:12px; }
.lstep h4{ font-size:18px; margin-bottom:7px; }
.lstep p{ font-size:14.5px; color:var(--ink-2); margin:0; }
.callout{ margin-top:20px; padding:22px 26px; background:var(--accent-t); border:1px solid #E7C7C0; border-radius:15px; }
.callout p{ margin:0; font-size:15.5px; color:var(--ink-2); }
.callout strong{ color:var(--accent-d); }
@media(max-width:720px){ .lang-steps{ grid-template-columns:1fr; } }

/* ===================== PIPELINE ===================== */
.pipe{ display:flex; flex-wrap:wrap; align-items:stretch; gap:14px; margin:34px 0 0; }
.pipe-stage{ flex:1; min-width:180px; background:var(--card); border:1px solid var(--line); border-radius:16px; padding:22px; box-shadow:var(--shadow); }
.pipe-stage.pipe-loop{ border-color:var(--accent); background:linear-gradient(180deg,var(--card),var(--accent-t)); }
.pipe-skill{ display:inline-block; font-family:var(--mono); font-size:15px; font-weight:700; color:var(--accent); background:#fff; padding:5px 12px; border-radius:8px; border:1px solid var(--line); }
.pipe-desc{ display:block; margin-top:12px; color:var(--ink-soft); font-size:14.5px; }
.pipe-arrow{ display:flex; align-items:center; font-size:26px; color:var(--line-2); }
@media(max-width:720px){ .pipe-arrow{ transform:rotate(90deg); justify-content:center; } .pipe{ flex-direction:column; } }

.loop{ display:grid; grid-template-columns:280px 1fr; gap:40px; align-items:center; margin:46px 0 0; }
.loop-ring{ display:flex; justify-content:center; }
.diag-loop{ max-width:260px; }
.loop-track{ fill:none; stroke:var(--line-2); stroke-width:2; }
.loop-run{ fill:none; stroke:var(--accent); stroke-width:3; stroke-linecap:round; --len:604; transform:rotate(-90deg); transform-origin:center; }
.diagram.in .loop-run{ animation:draw 1.6s ease forwards; }
.loop-step circle{ fill:var(--card); stroke:var(--accent); stroke-width:2.5; }
.diagram .loop-center-1{ font-family:var(--serif); font-size:16px; text-anchor:middle; fill:var(--ink-soft); }
.diagram .loop-center-2{ font-family:var(--serif); font-size:26px; font-weight:700; text-anchor:middle; fill:var(--green); }
.loop-list{ list-style:none; padding:0; margin:0; counter-reset:l; }
.loop-list li{ position:relative; padding:16px 0 16px 50px; border-bottom:1px solid var(--line); counter-increment:l; }
.loop-list li:last-child{ border-bottom:0; }
.loop-list li::before{ content:counter(l); position:absolute; left:0; top:14px; width:32px; height:32px; display:grid; place-items:center; border-radius:9px; background:var(--ink); color:var(--paper); font-family:var(--serif); font-weight:700; }
.loop-list b{ display:block; font-size:17px; font-family:var(--serif); }
.loop-list span{ display:block; font-size:14.5px; color:var(--ink-soft); }
@media(max-width:760px){ .loop{ grid-template-columns:1fr; } }

/* ===================== SAFETY ===================== */
.gate-demo{ display:flex; align-items:center; justify-content:center; gap:18px; flex-wrap:wrap; margin:42px auto 10px; }
.gate-action{ font-family:var(--mono); font-size:14px; color:#F3ECDD; background:#2a241d; border:1px solid #3a332b; padding:13px 18px; border-radius:11px; }
.gate-wall{ position:relative; width:60px; height:60px; display:grid; place-items:center; }
.gate-wall::before{ content:""; position:absolute; inset:0; border-radius:50%; border:2px dashed #5a5045; }
.gate-stamp{ font-size:30px; }
.diagram.in .gate-stamp, .gate-demo.in .gate-stamp{ animation:stamp .6s cubic-bezier(.3,1.4,.5,1) forwards; }
.gate-demo.in .gate-stamp{ animation:stamp .7s cubic-bezier(.3,1.5,.5,1) .3s both; }
@keyframes stamp{ 0%{ transform:scale(2.4) rotate(-14deg); opacity:0; } 60%{ opacity:1; } 100%{ transform:scale(1) rotate(-6deg); opacity:1; } }
.gate-result{ font-size:14.5px; color:#E9A79E; font-weight:600; }

.cards{ display:grid; grid-template-columns:repeat(3,1fr); gap:16px; margin:40px 0 0; }
.card{ background:var(--card); border:1px solid var(--line); border-radius:16px; padding:24px; box-shadow:var(--shadow); }
.card.dark{ background:#241F19; border-color:#352e25; }
.card.dark h4{ color:#F6B5AB; font-size:18px; margin-bottom:10px; }
.card.dark p{ margin:0; font-size:14.5px; color:#C9C0AF; }
.card.dark code{ background:rgba(255,255,255,.08); color:#F3ECDD; }
@media(max-width:900px){ .cards{ grid-template-columns:repeat(2,1fr); } }
@media(max-width:520px){ .cards{ grid-template-columns:1fr; } }

.audit-note{ display:flex; align-items:center; gap:22px; margin:36px auto 0; max-width:760px; padding:24px 28px; background:#241F19; border:1px solid #352e25; border-radius:16px; }
.audit-badge{ flex:none; font-family:var(--serif); font-weight:700; font-size:34px; color:#F6B5AB; }
.audit-badge span{ font-size:18px; color:#8a8072; vertical-align:middle; margin:0 2px; }
.audit-note p{ margin:0; font-size:15px; color:#C9C0AF; }
.audit-note strong{ color:#F3ECDD; }

/* ===================== TOOLSET ===================== */
.tool-group{ margin:30px 0 0; }
.tg-head{ font-size:14px; font-weight:700; letter-spacing:.06em; color:var(--ink-soft); text-transform:uppercase; margin:0 0 14px; padding-bottom:8px; border-bottom:1px solid var(--line); }
.chips{ display:flex; flex-wrap:wrap; gap:12px; }
.chip{ display:flex; flex-direction:column; gap:3px; background:var(--card); border:1px solid var(--line); border-radius:13px; padding:13px 17px; min-width:150px; box-shadow:var(--shadow); transition:transform .15s, border-color .2s; }
.chip:hover{ transform:translateY(-3px); border-color:var(--line-2); }
.chip b{ font-family:var(--mono); font-size:14.5px; }
.chip i{ font-style:normal; font-size:13px; color:var(--ink-soft); }
.chip.star{ border-color:var(--accent); background:linear-gradient(180deg,var(--card),var(--accent-t)); }
.chip.star b{ color:var(--accent-d); }
.chip.ag{ min-width:0; }
.chip.ag b{ color:var(--ink); }

/* ===================== HOW IT FEELS ===================== */
.feel-table{ margin:30px 0 0; border:1px solid var(--line); border-radius:16px; overflow:hidden; background:var(--card); box-shadow:var(--shadow); }
.feel-row{ display:grid; grid-template-columns:1fr 1.2fr; gap:18px; padding:16px 22px; border-bottom:1px solid var(--line); align-items:center; }
.feel-row:last-child{ border-bottom:0; }
.feel-head{ background:var(--paper-2); font-weight:700; font-size:13px; letter-spacing:.05em; text-transform:uppercase; color:var(--ink-soft); }
.feel-head div{ display:block; }
.fsay{ font-family:var(--serif); font-size:16.5px; color:var(--ink); }
.fdo{ font-size:15px; color:var(--ink-2); }
.gate-row{ background:linear-gradient(90deg,transparent,var(--accent-t)); }
.gate-row .fdo{ color:var(--accent-d); font-weight:600; }
@media(max-width:600px){ .feel-row{ grid-template-columns:1fr; gap:4px; } .feel-head{ display:none; } .fsay{ font-size:18px; } }

/* ===================== PHILOSOPHY ===================== */
.phil-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:18px; margin:30px 0 0; }
.phil{ padding:24px 26px; background:var(--card); border:1px solid var(--line); border-radius:16px; border-left:4px solid var(--accent); box-shadow:var(--shadow); }
.phil b{ display:block; font-family:var(--serif); font-size:19px; margin-bottom:8px; }
.phil span{ display:block; color:var(--ink-soft); font-size:15px; }
.nda{ margin:36px 0 0; padding:28px 32px; background:var(--paper-2); border:1px dashed var(--line-2); border-radius:16px; }
.nda h4{ font-size:20px; margin-bottom:12px; }
.nda p{ margin:0; color:var(--ink-2); font-size:15.5px; max-width:72ch; }
@media(max-width:720px){ .phil-grid{ grid-template-columns:1fr; } }

/* ===================== INSTALL ===================== */
.install-block{ margin:30px 0 0; display:flex; flex-direction:column; gap:12px; }
.cmd{ display:block; font-family:var(--mono); font-size:14.5px; background:var(--ink); color:#F3ECDD; padding:16px 20px; border-radius:12px; cursor:pointer; box-shadow:var(--shadow); transition:transform .12s; position:relative; }
.cmd:hover{ transform:translateY(-2px); }
.cmd .prompt{ color:var(--accent); margin-right:10px; }
.cmd.flash{ outline:2px solid var(--green); }
.install-note{ margin:22px 0 0; color:var(--ink-2); font-size:15.5px; }
.req{ margin:30px 0 0; padding:24px 28px; background:var(--card); border:1px solid var(--line); border-radius:16px; box-shadow:var(--shadow); }
.req h4{ font-size:18px; margin-bottom:10px; }
.req p{ margin:0; color:var(--ink-2); font-size:15px; }
.final-cta{ display:flex; align-items:center; gap:18px; flex-wrap:wrap; margin:34px 0 0; }
.repo-url{ font-family:var(--mono); font-size:14px; color:var(--ink-soft); }

/* ===================== FOOTER ===================== */
.footer{ background:var(--ink); color:#C9C0AF; padding:54px 0 30px; }
.foot-grid{ display:flex; justify-content:space-between; gap:34px; flex-wrap:wrap; padding-bottom:30px; border-bottom:1px solid #2a241d; }
.foot-brand{ display:flex; gap:14px; align-items:flex-start; max-width:360px; }
.foot-brand b{ font-family:var(--serif); font-size:20px; color:#F3ECDD; }
.foot-brand .brand-kanji{ color:#8a8072; }
.foot-brand p{ margin:6px 0 0; font-size:14px; }
.foot-links{ display:flex; flex-direction:column; gap:10px; }
.foot-links a{ color:#C9C0AF; font-size:14.5px; transition:color .2s; }
.foot-links a:hover{ color:var(--accent); }
.foot-base{ display:flex; justify-content:space-between; gap:14px; flex-wrap:wrap; padding-top:22px; font-size:13px; color:#8a8072; }

/* ===================== REVEAL ===================== */
.reveal{ opacity:0; transform:translateY(22px); transition:opacity .7s ease, transform .7s cubic-bezier(.2,.75,.25,1); }
.reveal.in{ opacity:1; transform:none; }

/* ===================== TIMELINE 3-PANEL (store) =====================
   Shared by index.html (mini) and ai-context-store.html (full):
   sessions swap along the top; one store persists along the bottom. */
.tl3{ background:var(--card); border:1px solid var(--line); border-radius:var(--r); box-shadow:var(--shadow-l); padding:20px; width:100%; }
.tl3-row{ display:grid; grid-template-columns:repeat(3,1fr); gap:14px; }
.tl3-cap{ display:flex; align-items:center; gap:7px; font-size:12px; font-weight:700; letter-spacing:.05em; color:var(--ink-soft); text-transform:uppercase; }
.tl3-cap .no{ display:grid; place-items:center; width:20px; height:20px; border-radius:50%; background:var(--ink); color:var(--paper); font-family:var(--serif); font-size:12px; flex:none; }
.tl3-box{ margin-top:8px; border:1.5px solid var(--line-2); border-radius:11px; background:var(--paper-2); padding:12px 14px; min-height:104px; }
.tl3-box b{ display:block; font-size:14px; color:var(--ink); }
.tl3-box span{ display:block; font-size:12.5px; color:var(--ink-2); margin-top:3px; line-height:1.5; }
.tl3-box i.end{ display:block; font-style:normal; margin-top:9px; font-family:var(--mono); font-size:11px; color:var(--accent-d); }
.tl3-box i.end.ok{ color:var(--green); }
.tl3-box.ghosted{ border-style:dashed; background:transparent; }
.tl3-box.ghosted b{ color:var(--ink-soft); }
.tl3-arrow{ height:32px; display:flex; align-items:center; justify-content:center; gap:6px; font-size:12.5px; color:var(--accent-d); font-weight:600; }
.tl3-arrow .gl{ font-size:16px; line-height:1; }
.tl3-arrow em{ font-style:normal; }
.tl3-store{ display:flex; align-items:center; justify-content:center; gap:8px 14px; flex-wrap:wrap; border:1.5px solid var(--accent); background:var(--accent-t); border-radius:11px; padding:12px 16px; text-align:center; }
.tl3-store b{ font-family:var(--mono); font-size:12.5px; color:var(--accent-d); }
.tl3-store span{ font-size:12.5px; color:var(--ink-2); }
.tl3.mini{ padding:14px; box-shadow:var(--shadow); }
.tl3.mini .tl3-row{ gap:10px; }
.tl3.mini .tl3-box{ min-height:88px; padding:9px 11px; }
.tl3.mini .tl3-box b{ font-size:12.5px; }
.tl3.mini .tl3-box span{ font-size:11px; }
.tl3.mini .tl3-cap{ font-size:10.5px; }
.tl3.mini .tl3-cap .no{ width:17px; height:17px; font-size:10.5px; }
.tl3.mini .tl3-arrow{ height:26px; font-size:11px; }
.tl3.mini .tl3-store{ padding:9px 12px; }
.tl3.mini .tl3-store b{ font-size:11px; }
.tl3.mini .tl3-store span{ font-size:11px; }
@media(max-width:640px){
  .tl3-row{ grid-template-columns:1fr; }
  .tl3-box{ min-height:0; }
  .tl3-arrow{ height:26px; }
}

/* loop-diagram point labels (index autonomous loop) */
.diagram .loop-lbl{ font-size:12px; font-weight:700; fill:var(--ink-2); text-anchor:middle; }

/* ===================== CHIPS AS LINKS (toolset → tools/*.html) ===================== */
.chip{ color:inherit; text-decoration:none; cursor:pointer; }
.chip:hover{ border-color:var(--accent); transform:translateY(-1px); }

/* ===================== NAV TOOLSET MEGA MENU ===================== */
.nav-item{ position:relative; display:inline-flex; }
.nav-menu{
  position:absolute; top:100%; left:50%;
  transform:translateX(-50%) translateY(6px);
  background:var(--card); border:1px solid var(--line); border-radius:14px;
  box-shadow:var(--shadow); padding:18px; margin-top:8px;
  display:grid; grid-template-columns:repeat(3,190px); gap:20px 26px;
  z-index:70; opacity:0; visibility:hidden; pointer-events:none;
  transition:opacity .18s ease, transform .18s ease, visibility .18s;
  transition-delay:.12s; /* linger on close so the cursor can cross the gap */
  max-width:calc(100vw - 24px);
  max-height:calc(100vh - 92px); overflow-y:auto;
}
/* invisible bridge over the 8px gap between trigger and menu */
.nav-menu::before{
  content:""; position:absolute; left:0; right:0; top:-14px; height:14px;
}
.nav-item.has-menu:hover .nav-menu,
.nav-item.has-menu.open .nav-menu,
.nav-item.has-menu:focus-within .nav-menu{
  opacity:1; visibility:visible; transform:translateX(-50%) translateY(0); pointer-events:auto;
  transition-delay:0s;
}
/* narrower viewports: fewer mega-menu columns so nothing clips */
@media(max-width:1080px){
  .nav-menu{ grid-template-columns:repeat(2,190px); }
}
.nav-menu.slim{ grid-template-columns:1fr; width:max-content; min-width:220px; padding:12px 14px; }
.nav-menu.slim .nav-menu-col a{ padding:7px 10px; }
.nav-menu.slim .nav-menu-col a span{ font-size:13.5px; color:var(--ink); }
.nav-menu-col{ display:flex; flex-direction:column; gap:2px; }
.nav-menu-head{ font-size:11px; text-transform:uppercase; letter-spacing:.04em; color:var(--ink-soft); font-weight:700; margin-bottom:6px; }
.nav-menu-col a{ display:flex; flex-direction:column; gap:1px; padding:6px 8px; margin:0 -8px; border-radius:8px; color:var(--ink); text-decoration:none; transition:background .15s; }
.nav-menu-col a:hover{ background:rgba(28,24,20,.05); }
.nav-menu-col a b{ font-family:var(--mono); font-size:13px; }
.nav-menu-col a span{ font-size:11.5px; color:var(--ink-soft); }

/* ===================== JA TYPOGRAPHY =====================
   ch-based width caps are Latin-sized: 18ch ≈ 10 full-width chars,
   which crushes JA headings into narrow 3-line stacks. Widen the caps
   and break at phrase boundaries (auto-phrase: Chromium 119+, others
   fall back to normal breaking). */
body[data-lang="ja"] h1,
body[data-lang="ja"] h2,
body[data-lang="ja"] h3,
body[data-lang="ja"] h4{ word-break:auto-phrase; }
body[data-lang="ja"] .band h2{ max-width:24em; }
body[data-lang="ja"] .band h2.center{ max-width:20em; }

/* ===================== REDUCED MOTION ===================== */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation:none !important; transition:none !important; }
  .reveal{ opacity:1; transform:none; }
  .node,.lp-node,.ctx-store,.ctx-sess,.ctx-repo,.exc-badge,.ws-dot,.ws-line{ opacity:1; transform:none; }
  .flow,.lp-flow,.ctx-flow,.ws-arc,.loop-run{ stroke-dashoffset:0; }
  .gate-stamp{ opacity:1; transform:rotate(-6deg); }
}