/* rangooo fx: calm depth effects for the home page. Tilt on covers + a scroll-driven "how it works" story. */

/* ---- calmer hero: fewer floating shapes, softer ---- */
.kbb .kdoodle .kd-au{opacity:.45}
.kbb .kdoodle .kd-pl{opacity:.55}
.kbb.intro .toran{opacity:.5}

/* ---- tilt on covers (mouse only; JS sets --fx-rx/--fx-ry and glare position) ---- */
.story.fx-t,.shelf .feat.fx-t{transform:perspective(900px) rotateX(var(--fx-rx,0deg)) rotateY(var(--fx-ry,0deg)) translateY(-3px);transition:transform .08s linear,box-shadow .25s;will-change:transform}
.story.fx-t::after,.shelf .feat.fx-t::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;background:radial-gradient(circle at var(--fx-gx,50%) var(--fx-gy,30%),rgba(255,255,255,.38),rgba(255,255,255,0) 55%);mix-blend-mode:soft-light}
.story,.shelf .feat{position:relative}

/* ---- scroll story ---- */
.fx-story{--p:0;position:relative;height:290vh;margin:-24px 0 24px}
.fx-pin{position:sticky;top:64px;height:calc(100vh - 64px);height:calc(100svh - 64px);min-height:520px;display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);align-items:center;gap:32px;padding:0 24px;max-width:1240px;margin:0 auto}
.fx-copy{position:relative;min-height:230px}
.fx-kick{font:600 12px/1 var(--ui);letter-spacing:.14em;text-transform:uppercase;color:var(--mark)}
.fx-steps{position:relative;margin-top:18px;height:190px}
.fx-step{position:absolute;inset:0 0 auto 0;opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease);pointer-events:none}
.fx-step.on{opacity:1;transform:none;pointer-events:auto}
.fx-step h3{font:500 clamp(28px,3.4vw,44px)/1.1 var(--head);letter-spacing:-.015em;margin:0 0 12px;color:var(--ink)}
.fx-step p{font:400 16px/1.6 var(--ui);color:var(--muted);margin:0;max-width:34ch}
.fx-rail{display:flex;gap:8px;margin-top:8px}
.fx-rail i{flex:0 0 auto;width:36px;height:3px;border-radius:3px;background:var(--line-strong);overflow:hidden;position:relative}
.fx-rail i::after{content:"";position:absolute;inset:0;background:var(--accent);transform:scaleX(var(--f,0));transform-origin:left}

.fx-stage{position:relative;height:min(64vh,560px);perspective:1400px;display:flex;align-items:center;justify-content:center}
.fx-world{position:relative;width:min(300px,60%);aspect-ratio:300/380;transform-style:preserve-3d;transform:rotateX(8deg) rotateY(calc(-18deg + var(--p) * 36deg));transition:transform .2s linear}
.fx-glow{position:absolute;inset:-12% -8%;border-radius:50%;background:radial-gradient(closest-side,rgba(20,92,99,.12),rgba(242,140,40,.10) 60%,transparent);filter:blur(30px);transform:translateZ(-120px)}
.fx-card{position:absolute;inset:0;border-radius:18px;overflow:hidden;background:#fff;box-shadow:0 2px 4px rgba(22,32,44,.06),0 28px 60px rgba(22,32,44,.18);transition:transform 1s var(--ease),opacity .8s var(--ease),filter .8s var(--ease);backface-visibility:hidden}
.fx-art,.fx-colour{position:absolute;inset:0;display:block;border-radius:inherit;overflow:hidden}.fx-art svg,.fx-colour svg{width:100%;height:100%;display:block}
button.fx-card{border:0;padding:0;font:inherit;color:inherit;cursor:default;-webkit-tap-highlight-color:transparent}
.fx-top .fx-card.c0,.fx-top .fx-card.c2{cursor:pointer}
.fx-top .fx-card.c0:hover{transform:translate3d(-62%,2%,-40px) rotateY(18deg) scale(.86)}.fx-top .fx-card.c2:hover{transform:translate3d(62%,2%,-40px) rotateY(-18deg) scale(.86)}
.fx-card .fx-name{position:absolute;left:12%;right:12%;bottom:7%;padding:9px 12px;border-radius:12px;background:rgba(255,255,255,.92);text-align:center;font:600 17px/1.2 var(--head);color:var(--ink);box-shadow:var(--sh-2);opacity:0;transform:translateY(10px);transition:opacity .6s .2s var(--ease),transform .6s .2s var(--ease)}
.fx-card .fx-colour{transition:clip-path 1.6s var(--ease)}
.fx-plain .fx-art svg{filter:grayscale(1) contrast(.5) brightness(1.4)}
.fx-pencil{position:absolute;width:46px;height:46px;right:8%;top:30%;opacity:0;transform:translateZ(60px) rotate(20deg);transition:opacity .5s,top 1.6s var(--ease),right 1.6s var(--ease)}
.fx-ring{position:absolute;inset:0;transform-style:preserve-3d;transition:opacity .8s var(--ease);opacity:0}
.fx-ring span{position:absolute;left:50%;top:50%;margin:-17px 0 0 -52px;width:104px;height:34px;display:flex;align-items:center;justify-content:center;border-radius:99px;background:#fff;border:1px solid var(--line);box-shadow:var(--sh-2);font:600 14px var(--ui);color:var(--ink);backface-visibility:hidden;-webkit-backface-visibility:hidden}

/* scene states: s0 fan of covers, s1 name on the cover, s2 colouring, s3 language ring */
.fx-card.c0{transform:translate3d(-62%,4%,-70px) rotateY(24deg) scale(.82)}
.fx-card.c1{transform:translate3d(0,0,0)}
.fx-card.c2{transform:translate3d(62%,4%,-70px) rotateY(-24deg) scale(.82)}
[data-s="1"] .fx-card.c0,[data-s="1"] .fx-card.c2,[data-s="2"] .fx-card.c0,[data-s="2"] .fx-card.c2,[data-s="3"] .fx-card.c0,[data-s="3"] .fx-card.c2{opacity:0;transform:translate3d(0,0,-140px) scale(.8)}
[data-s="1"] .fx-card.c1 .fx-name,[data-s="2"] .fx-card.c1 .fx-name,[data-s="3"] .fx-card.c1 .fx-name{opacity:1;transform:none}
[data-s="2"] .fx-card.c1 .fx-colour{clip-path:inset(0 0 0 0)}
[data-s="2"] .fx-card.c1 .fx-colour{animation:fxpaint 2.6s var(--ease) both}
@keyframes fxpaint{from{clip-path:inset(0 100% 0 0)}to{clip-path:inset(0 0 0 0)}}
@keyframes fxpen{from{right:78%;top:50%}to{right:8%;top:62%}}
[data-s="2"] .fx-pencil{opacity:1;animation:fxpen 2.6s var(--ease) both}
[data-s="3"] .fx-ring{opacity:1;animation:fxspin 22s linear infinite}
[data-s="3"] .fx-card.c1{transform:translateZ(0) scale(.9)}
@keyframes fxspin{to{transform:rotateY(360deg)}}

@media (max-width:860px){
  .fx-story{height:300vh}
  .fx-pin{grid-template-columns:1fr;grid-template-rows:auto 1fr;gap:6px;padding:0 20px;align-content:start;padding-top:18px}
  .fx-copy{order:2;min-height:0;text-align:center}
  .fx-steps{height:150px}
  .fx-step p{margin:0 auto}
  .fx-rail{justify-content:center}
  .fx-stage{order:1;height:min(46vh,380px)}
  .fx-world{width:min(210px,56%)}
}
@media (prefers-reduced-motion:reduce){
  .fx-story{height:auto}
  .fx-pin{position:static;height:auto;display:block;padding:0 24px}
  .fx-stage,.fx-rail{display:none}
  .fx-steps{height:auto}
  .fx-step{position:static;opacity:1;transform:none;margin-bottom:22px}
}

/* hero mode */
html.fx-hero .kbb,html.fx-hero .khero,html.fx-hero .kh2,html.fx-hero .vr{display:none!important}
.fx-h1{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.fx-step h2{font:500 clamp(30px,3.6vw,48px)/1.1 var(--head);letter-spacing:-.015em;margin:0 0 12px;color:var(--ink)}
.fx-step h3{font:inherit}
.fx-in{display:flex;align-items:center;gap:10px;margin-top:16px;width:min(380px,100%);padding:6px 6px 6px 16px;border-radius:16px;background:var(--surface);border:1px solid var(--line-strong);box-shadow:var(--sh-2)}
.fx-in span{font:600 11.5px/1 var(--ui);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);white-space:nowrap}
.fx-in input{flex:1;min-width:0;height:46px;border:0;outline:0;background:none;font:600 20px var(--ui);color:var(--ink)}
.fx-in:focus-within{border-color:var(--accent);box-shadow:0 0 0 4px rgba(20,92,99,.14),var(--sh-2)}
.fx-act{display:flex;align-items:center;gap:16px;margin-top:22px}
.fx-go{height:52px;padding:0 24px;border:0;border-radius:15px;background:linear-gradient(135deg,#145C63,#0F474D);color:#fff;font:700 16px var(--ui);display:inline-flex;align-items:center;gap:10px;cursor:pointer;box-shadow:0 10px 24px rgba(15,71,77,.3);transition:transform .25s var(--ease),box-shadow .25s}
.fx-go:hover{transform:translateY(-2px);box-shadow:0 16px 32px rgba(15,71,77,.36)}
.fx-go:active{transform:scale(.97)}
.fx-scroll{display:none;color:var(--muted);animation:fxcue 2.2s ease-in-out infinite}
.fx-top .fx-scroll{display:inline-flex}
@keyframes fxcue{50%{transform:translateY(6px);opacity:.5}}
.fx-cap{position:absolute;left:0;right:0;bottom:-6px;text-align:center;font:600 15px var(--ui);color:var(--ink);opacity:0;transition:opacity .5s}
.fx-top .fx-cap{opacity:.9}
html[data-night="1"] .fx-in{background:var(--surface)}
html[data-night="1"] .fx-go{background:linear-gradient(135deg,#4FB3C4,#2E8EA0);color:#0B1218}
@media (max-width:860px){.fx-story{height:270vh;margin-top:-16px}.fx-act{justify-content:center}.fx-in{margin-inline:auto}.fx-cap{display:none}}
@media (prefers-reduced-motion:reduce){.fx-scroll{display:none!important}.fx-act{margin-bottom:28px}}
.fx-story{background:radial-gradient(55% 50% at 78% 38%,rgba(242,140,40,.13),rgba(242,140,40,0) 70%),radial-gradient(45% 45% at 12% 72%,rgba(14,124,134,.11),rgba(14,124,134,0) 70%),radial-gradient(40% 40% at 92% 88%,rgba(229,72,123,.10),rgba(229,72,123,0) 70%)}
html[data-night="1"] .fx-story{background:radial-gradient(55% 50% at 78% 38%,rgba(240,168,98,.10),rgba(240,168,98,0) 70%),radial-gradient(45% 45% at 12% 72%,rgba(79,179,196,.10),rgba(79,179,196,0) 70%)}
.fx-steps{height:260px}
@media (max-width:860px){.fx-steps{height:236px}.fx-copy{min-height:0}}

/* slide-controlled hero: one screen tall, normal scrolling */
.fx-story,.fx-story.fx-top{height:auto!important}
.fx-pin{position:relative!important;top:auto!important;height:clamp(560px,calc(100svh - 64px),860px)!important}
@media (max-width:860px){.fx-story{height:auto!important}.fx-pin{height:auto!important;min-height:calc(100svh - 64px - 76px)!important;padding-bottom:20px!important}}
.fx-ctl{display:flex;align-items:center;gap:10px;margin-top:8px}
.fx-arr{width:38px;height:38px;border-radius:50%;border:1px solid var(--line-strong);background:var(--surface);color:var(--ink);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;flex:0 0 auto;transition:background .2s,border-color .2s,transform .2s}
.fx-arr:hover{border-color:var(--ink);transform:scale(1.06)}
.fx-arr:active{transform:scale(.94)}
.fx-rail{margin-top:0!important;gap:6px!important}
.fx-dot{border:0;background:none;padding:14px 0;cursor:pointer;position:relative}
.fx-dot i{display:block;width:44px;height:4px;border-radius:4px;background:var(--line-strong);overflow:hidden;position:relative}
.fx-dot i::after{content:"";position:absolute;inset:0;background:var(--accent);transform:scaleX(0);transform-origin:left}
.fx-dot.done i::after{transform:scaleX(1)}
.fx-dot.on i::after{transform:scaleX(1)}
.fx-dot.on.auto i::after{animation:fxfill 8s linear both}
@keyframes fxfill{from{transform:scaleX(0)}to{transform:scaleX(1)}}
.fx-dot:focus-visible,.fx-arr:focus-visible{outline:3px solid #E8590C;outline-offset:2px}
.fx-dot:hover i{background:var(--muted)}
.fx-stage{touch-action:pan-y}
@media (max-width:860px){.fx-dot i{width:34px}}
@media (prefers-reduced-motion:reduce){.fx-dot.on.auto i::after{animation:none}}