/* 首頁：字根像隕石一樣飄，對得上的碰在一起就撞成一個字。 */
body.home{padding:0;min-height:100vh;overflow-x:hidden}

.sky{position:fixed;inset:0;overflow:hidden;z-index:0}
.frag{position:absolute;left:0;top:0;display:flex;align-items:center;gap:2px;white-space:nowrap;cursor:grab;touch-action:none;
  -webkit-user-select:none;user-select:none;will-change:transform;font-family:var(--display);font-weight:800;font-size:1.2rem;letter-spacing:-.01em;line-height:1.3}
.frag:active{cursor:grabbing}
.frag .p{position:relative;padding:1px 7px;border-radius:7px;background:rgba(255,255,255,.9);border:1px solid var(--line);color:var(--ink)}
.trails{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.frag.multi .p{background:var(--hl);border-color:transparent;color:var(--hl-ink)}
.frag.complete{font-size:1.9rem;gap:3px;filter:drop-shadow(0 6px 16px rgba(47,75,234,.22))}
.frag.complete .p{padding:0 .12em}
.frag.gone{opacity:0;transition:opacity .9s}

/* 合體：先縮（吸氣），再帶一點重量地彈回來，光澤掃過 */
.frag .p{transition:transform .2s cubic-bezier(.55,0,.75,.2)}
.frag.squeeze .p{transform:scale(.9)}
.frag.release .p{animation:release .55s cubic-bezier(.2,.9,.3,1) both}
@keyframes release{0%{transform:scale(.9)}45%{transform:scale(1.035)}100%{transform:none}}
.frag::after{content:"";position:absolute;inset:-3px;border-radius:10px;pointer-events:none;opacity:0;
  background:linear-gradient(105deg,transparent 35%,rgba(255,255,255,.85) 50%,transparent 65%) no-repeat;background-size:250% 100%;background-position:120% 0}
.frag.release::after{animation:sheen .8s cubic-bezier(.22,1,.36,1) both}
@keyframes sheen{0%{opacity:1;background-position:120% 0}100%{opacity:1;background-position:-30% 0}}

.pop{position:fixed;left:0;top:0;z-index:5;max-width:min(300px,calc(100vw - 24px));background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:10px 13px;box-shadow:0 10px 28px rgba(27,31,59,.14);pointer-events:none;display:grid;gap:6px;font-size:.9rem;line-height:1.5}
.pop .pw{font-family:var(--display);font-weight:800;font-size:1.15rem}
.pop .pw small{font-family:var(--body);font-weight:500;color:var(--muted);font-size:.8rem;margin-left:6px}
.pop .pa{font-weight:700;font-size:1rem}
.pop .pf{display:flex;flex-wrap:wrap;gap:4px 6px;align-items:center}
.pop .pf span{background:var(--hl);border-radius:5px;padding:0 6px;font-family:var(--display);font-weight:800}
.pop .pf span i{font-family:var(--body);font-style:normal;font-weight:500;margin-left:4px}
.pop .pn{color:var(--muted);font-size:.82rem}

.home-main{position:relative;z-index:1;max-width:660px;margin:0 auto;padding:22px 16px 56px;display:grid;gap:28px;pointer-events:none}
.home-main>*{pointer-events:auto}
.home-top{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;pointer-events:none}
.home-top>*{pointer-events:auto}
.home-top .acts{display:flex;align-items:center;gap:8px;margin:0}
.home-top .acts .btn{padding:6px 11px;font-size:.85rem}
.home-top .who{display:flex;align-items:center;gap:8px;font-weight:700}

.pitch,.how,.facts{background:rgba(255,255,255,.82);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);border:1px solid var(--line);border-radius:18px;padding:22px 20px}
.pitch{display:grid;gap:14px;margin-top:8vh}
.pitch h1{margin:0;font-family:var(--display);font-weight:800;font-size:clamp(1.7rem,6vw,2.5rem);line-height:1.2;letter-spacing:-.02em;text-wrap:balance}
.pitch p{margin:0;font-size:1.02rem;line-height:1.8}
.pitch p b{font-family:var(--display);font-weight:800}
.cta{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.btn.big{padding:12px 20px;font-size:1.02rem;border-radius:12px}

.how h2,.facts h2{margin:0 0 12px;font-family:var(--display);font-weight:800;font-size:1.2rem}
.how ol{margin:0;padding:0;list-style:none;counter-reset:s;display:grid;gap:12px}
.how li{counter-increment:s;display:grid;grid-template-columns:auto 1fr;gap:2px 12px}
.how li::before{content:counter(s);grid-row:span 2;width:28px;height:28px;border-radius:50%;background:var(--hl-1);display:grid;place-items:center;
  font-family:var(--display);font-weight:800;font-size:.95rem}
.how li:nth-child(2)::before{background:var(--hl-2)} .how li:nth-child(3)::before{background:var(--hl-3)} .how li:nth-child(4)::before{background:var(--hl-4)}
.how li span,.facts li span{color:var(--muted);font-size:.92rem}
.facts ul{margin:0;padding:0;list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px 20px}
.facts li{display:grid;gap:2px}
.home-foot{text-align:center;font-size:.8rem;color:var(--muted);background:rgba(247,249,255,.8);border-radius:8px;padding:4px 8px;justify-self:center}
.pitch h1 span{display:inline-block}
@media (max-width:700px){.pitch{margin-top:12vh}}
@media (max-width:560px){
  .home-main{gap:22px}
  .home-top{flex-wrap:nowrap}
  .home-top .mark{font-size:1.25rem;white-space:nowrap}
  .home-top .acts{gap:6px}
  .home-top .acts .btn{padding:5px 10px;font-size:.82rem}
  .home-top .gh-text,.home-top .who-name,.home-top .wide-only{display:none}
  .home-top .btn.gh{padding:6px 8px}
  .pitch,.how,.facts{padding:18px 16px}
  .pitch p{font-size:.98rem;line-height:1.75}
  .cta .btn.big{flex:1 1 100%;justify-content:center}
  .frag{font-size:1.05rem}
  .frag.complete{font-size:1.5rem}
  .d-word{font-size:1.7rem}
}

/* 「怎麼用」的示範動畫 */
.demo{display:grid;gap:10px;justify-items:center;background-color:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 14px;margin:0 0 16px;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:18px 18px}
.d-word{display:flex;align-items:flex-start;gap:0;font-family:var(--display);font-weight:800;font-size:2rem;letter-spacing:-.02em;line-height:1.1;transition:gap .5s cubic-bezier(.22,1,.36,1)}
.dp{display:flex;flex-direction:column;align-items:center;border-radius:7px;transition:background-color .4s,padding .5s cubic-bezier(.22,1,.36,1)}
.dp b{font-weight:800}
.dp i{font-style:normal;font-family:var(--body);font-weight:700;font-size:.8rem;color:var(--muted);letter-spacing:0;max-height:0;opacity:0;overflow:hidden;
  transition:max-height .45s cubic-bezier(.22,1,.36,1),opacity .45s,margin .45s}
.d-word.split{gap:.35em}
.d-word.split .dp{padding:0 .1em;background:var(--hl-1)}
.d-word.split .dp:nth-child(2){background:var(--hl-2)} .d-word.split .dp:nth-child(3){background:var(--hl-3)}
.d-word.meant .dp{background:transparent!important;padding:0}
.d-word.meant .dp b{background:var(--hl-1);border-radius:7px;padding:0 .1em}
.d-word.meant .dp:nth-child(2) b{background:var(--hl-2)} .d-word.meant .dp:nth-child(3) b{background:var(--hl-3)}
.d-word.meant .dp i{max-height:1.4em;opacity:1;margin-top:4px}
.d-input{width:min(100%,320px);min-height:40px;display:flex;align-items:center;background:var(--card);border:1.5px solid var(--line);border-radius:10px;padding:8px 12px;font-size:.95rem}
.caret{display:inline-block;width:1.5px;height:1.1em;background:var(--accent);margin-left:1px;animation:caret 1s steps(2) infinite}
@keyframes caret{50%{opacity:0}}
.d-fb{min-height:26px;display:flex;align-items:center;gap:8px;font-size:.88rem;text-align:left;width:min(100%,320px);opacity:0;transform:translateY(4px);
  transition:opacity .35s,transform .45s cubic-bezier(.22,1,.36,1)}
.d-fb.show{opacity:1;transform:none}
.d-fb .tag{flex:none}
.d-fb .ans{font-weight:700;font-size:1rem}
.how li{transition:opacity .35s}
.how ol.playing li{opacity:.45}
.how ol.playing li.on{opacity:1}
.how li::before{transition:transform .35s cubic-bezier(.22,1,.36,1)}
.how li.on::before{transform:scale(1.15)}