/* ECHO Consulting · the boundary card · environment shaping, interactive. Flat and fully readable without JavaScript. */
.bnd{padding-block:110px;background:var(--paper);overflow-x:clip}
.bnd .section-heading{margin-bottom:44px}
.bnd-picks{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 34px}
.bnd-pick{appearance:none;border:1px solid #c9d0c8;background:transparent;color:var(--ink);font:500 14px/1.2 var(--sans);padding:13px 17px;border-radius:var(--radius);cursor:pointer;transition:background .25s,color .25s,border-color .25s}
.bnd-pick:hover{border-color:var(--ink)}
.bnd-pick[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.bnd-pick:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.bnd-stage{perspective:1900px;perspective-origin:50% -12%}
.bnd-plane{--a:1;position:relative;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;transform-style:preserve-3d;transform-origin:50% 0;transform:rotateX(calc((1 - var(--a)) * 50deg + var(--ty,0deg))) rotateY(var(--tx,0deg)) translate3d(0,calc((1 - var(--a)) * -30px),0) scale(calc(.9 + var(--a) * .1));transition:transform .45s cubic-bezier(.2,.7,.2,1)}
.bnd-plane::before{content:"";position:absolute;inset:-26px;border:1px solid var(--line);background:linear-gradient(var(--line) 1px,transparent 1px) 0 0/100% 34px,linear-gradient(90deg,var(--line) 1px,transparent 1px) 0 0/34px 100%;opacity:calc((1 - var(--a)) * .9);transform:translateZ(-2px);pointer-events:none;transition:opacity .45s}
.bnd-pane{--z:0px;position:relative;display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);padding:26px 24px 20px;transform:translateZ(calc((1 - var(--a)) * var(--z)));box-shadow:0 calc((1 - var(--a)) * 40px) calc(20px + (1 - var(--a)) * 40px) -30px rgba(20,42,48,.35);transition:transform .45s cubic-bezier(.2,.7,.2,1),box-shadow .45s}
.bnd-pane::before{content:"";position:absolute;left:-1px;right:-1px;top:-1px;height:3px;background:var(--lane)}
.bnd-pane[data-lane="prep"]{--lane:#3d74b5;--dot:#3d74b5;--z:40px}
.bnd-pane[data-lane="confirm"]{--lane:repeating-linear-gradient(90deg,var(--gold) 0 10px,transparent 10px 16px);--dot:var(--gold);--z:95px;--ld:130ms}
.bnd-pane[data-lane="human"]{--lane:var(--gold);--dot:var(--gold);--z:150px;--ld:260ms;background:#fbf8f1}
.bnd-ph{display:grid;grid-template-columns:auto 1fr;gap:4px 14px;align-items:baseline;padding-bottom:18px;border-bottom:1px solid var(--line)}
.bnd-n{font-size:12px;font-weight:600;letter-spacing:.08em;color:#7a5a26}
.bnd-ph h3{margin:0;font-size:clamp(21px,1.8vw,26px);line-height:1.15;letter-spacing:-.02em}
.bnd-ph p{grid-column:2;margin:0;font-size:13px;line-height:1.5;color:var(--muted)}
.bnd-items{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:0}
.bnd-items li{display:flex;align-items:baseline;justify-content:space-between;gap:14px;padding:12px 0;border-bottom:1px dashed #e1e4de;font-size:16px;line-height:1.4}
.bnd-items li:last-child{border-bottom:0}
.bnd-tag{flex:0 0 auto;display:inline-flex;align-items:center;gap:6px;font-size:10.5px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.bnd-tag::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--dot,var(--gold))}
.bnd-foot{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}
.bnd-foot>div{border-top:1px solid var(--ink);padding-top:14px}
.bnd-foot b{display:block;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:600}
.bnd-foot .v{display:block;margin-top:6px;font-size:17px;line-height:1.45;transition:opacity .3s}
.bnd-swap .bnd-foot .v{opacity:0}
.bnd-cta{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 30px;margin-top:30px}
.bnd-cta .micro{margin:0;max-width:660px;font-size:13px;line-height:1.6;color:var(--muted)}
html.js .bnd-stage:not(.bnd-go) .bnd-items li{opacity:0}
.bnd-go .bnd-items li{animation:bndIn .62s cubic-bezier(.2,.7,.2,1) both;animation-delay:calc(var(--ld,0ms) + var(--i,0) * 70ms)}
.bnd-go .bnd-items li.bnd-out{animation:bndOut .2s ease both}
@keyframes bndIn{from{opacity:0;transform:translate3d(0,10px,0)}to{opacity:1;transform:none}}
@keyframes bndOut{to{opacity:0;transform:translate3d(0,-8px,0)}}
@media(max-width:900px){.bnd{padding-block:72px}.bnd-plane{grid-template-columns:1fr;gap:12px;transform:rotateX(calc((1 - var(--a)) * 34deg)) translate3d(0,calc((1 - var(--a)) * -20px),0) scale(calc(.94 + var(--a) * .06))}.bnd-pane[data-lane="prep"]{--z:24px}.bnd-pane[data-lane="confirm"]{--z:56px}.bnd-pane[data-lane="human"]{--z:88px}.bnd-foot{grid-template-columns:1fr}.bnd-plane::before{inset:-12px}}
@media(max-width:700px){.bnd-picks{flex-wrap:nowrap;overflow-x:auto;scroll-snap-type:x mandatory;margin-inline:calc(var(--gutter) * -1);padding-inline:var(--gutter);scrollbar-width:none}.bnd-picks::-webkit-scrollbar{display:none}.bnd-pick{flex:0 0 auto;scroll-snap-align:start}.bnd-items li{font-size:15.5px}}
@media(prefers-reduced-motion:reduce){.bnd-plane,.bnd-pane{transform:none!important;transition:none!important;box-shadow:none}.bnd-plane::before{display:none}html.js .bnd-stage .bnd-items li{animation:none!important;opacity:1!important}}

/* v3 · definition line, more workflows, the AI-sender rule, CTA button */
.bnd-def{margin-top:22px;font-size:clamp(18px,1.5vw,21px);line-height:1.55;letter-spacing:-.015em;max-width:660px;color:var(--ink)}
.bnd .intro{margin-top:14px}
.bnd-pick,.bnd-more{min-height:44px}
.bnd-more{appearance:none;border:1px dashed #9eaca3;background:transparent;color:var(--muted);font:500 14px/1.2 var(--sans);padding:13px 17px;border-radius:var(--radius);cursor:pointer;transition:color .25s,border-color .25s}
.bnd-more:hover{color:var(--ink);border-color:var(--ink)}
.bnd-more[aria-expanded="true"]{border-style:solid;color:var(--ink)}
.bnd-more:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.bnd-more-set:not([hidden]){display:contents}
.bnd-ai{margin-top:22px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.bnd-ai[hidden]{display:none}
.bnd-ai summary{font-size:17px}
.bnd-ai p{padding:0 0 22px;font-size:16px;line-height:1.7;max-width:780px}
.bnd-cta .button{flex:0 0 auto}
@media(max-width:700px){.bnd-more{flex:0 0 auto;scroll-snap-align:start}.bnd-cta .button{width:100%;justify-content:space-between}}