:root{
  --bg:#0a0b12;
  --card:rgba(255,255,255,.04);
  --line:rgba(255,255,255,.10);
  --ink:#f0f2fa;
  --dim:#8f97b8;
  --accent:#6ee7ff;
  --accent2:#a78bfa;
  --ja:#ffd48a;
  --jp:"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP","Yu Gothic UI",system-ui,sans-serif;
  --en:"Segoe UI","Helvetica Neue",Arial,system-ui,sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg);color:var(--ink);font-family:var(--jp);
  min-height:100dvh;overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(760px 480px at 12% -8%, rgba(110,231,255,.14), transparent 62%),
    radial-gradient(700px 480px at 92% 2%, rgba(167,139,250,.14), transparent 62%),
    var(--bg);
}
button{font-family:inherit;color:inherit;border:0;background:none;cursor:pointer}
main{max-width:860px;margin:0 auto;padding:0 16px 60px}

/* ---------- header ---------- */
.top{max-width:860px;margin:0 auto;padding:min(7vh,54px) 16px 22px;text-align:center}
.top h1{
  margin:0;font-size:clamp(34px,9vw,54px);font-weight:900;letter-spacing:-.02em;line-height:1;
  background:linear-gradient(100deg,#fff 15%,var(--accent) 58%,var(--accent2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.top p{margin:14px 0 0;font-size:14px;color:var(--dim);line-height:1.8}
.top b{color:#fff;background:linear-gradient(transparent 62%,rgba(110,231,255,.26) 62%)}

/* ---------- input ---------- */
.input-card{border:1px solid var(--line);border-radius:20px;padding:16px;background:var(--card)}
#src{
  width:100%;min-height:190px;resize:vertical;padding:16px;border-radius:14px;
  background:rgba(0,0,0,.28);border:1px solid var(--line);color:var(--ink);
  font-family:var(--en);font-size:16px;line-height:1.75;
}
#src::placeholder{color:#616a8e;font-family:var(--jp);font-size:14px}
#src:focus{outline:none;border-color:rgba(110,231,255,.5);box-shadow:0 0 0 3px rgba(110,231,255,.10)}
.row{display:flex;align-items:center;gap:8px;margin:12px 2px}
.count{margin-left:auto;font-family:var(--en);font-size:11.5px;color:var(--dim);font-weight:700}
.ghost{
  font-size:12.5px;padding:9px 15px;border-radius:999px;font-weight:700;
  background:rgba(255,255,255,.06);border:1px solid var(--line);
}
.ghost:active{transform:scale(.97)}
.ghost.on{background:var(--accent);color:#04121a;border-color:transparent}
.go{
  display:block;width:100%;padding:18px;border-radius:999px;font-weight:900;font-size:17px;color:#04121a;
  background:linear-gradient(100deg,var(--accent),#bdf1ff 42%,var(--accent2));
  box-shadow:0 12px 36px -12px rgba(110,231,255,.65);transition:transform .15s,opacity .2s;
}
.go:active{transform:scale(.98)}
.go:disabled{opacity:.45;cursor:default;box-shadow:none}
.note{margin:12px 2px 0;font-size:11.5px;color:var(--dim);line-height:1.7;text-align:center}

/* ---------- toolbar ---------- */
.bar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:center;margin:28px 0 4px}
.seg{display:flex;align-items:center;gap:4px;background:rgba(255,255,255,.05);border-radius:999px;padding:4px 6px 4px 13px}
.seg>span{font-size:11px;color:var(--dim);margin-right:3px}
.seg button{font-size:11.5px;padding:7px 13px;border-radius:999px;color:var(--dim);font-weight:700}
.seg button.on{background:var(--accent);color:#04121a}

/* ---------- output ---------- */
.out{margin-top:18px;display:grid;gap:14px}
.sent{
  border:1px solid var(--line);border-radius:18px;padding:18px 16px 14px;background:var(--card);
  animation:pop .35s ease both;
}
@keyframes pop{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.chunks{display:flex;flex-wrap:wrap;align-items:flex-start;gap:6px 4px}
.ck{
  display:flex;flex-direction:column;gap:2px;padding:6px 9px;border-radius:10px;
  border:1px solid transparent;transition:background .15s,border-color .15s;
}
.ck:hover{background:rgba(110,231,255,.07);border-color:rgba(110,231,255,.22)}
.ck .e{font-family:var(--en);font-size:clamp(18px,4.6vw,23px);font-weight:700;line-height:1.35;letter-spacing:-.01em}
.ck .j{font-size:11.5px;color:var(--ja);line-height:1.5;font-weight:600}
body.nj .ck .j{display:none}

.sent-foot{display:flex;align-items:center;gap:8px;margin-top:12px;padding-top:11px;border-top:1px solid var(--line)}
.mini{font-size:11px;padding:6px 11px;border-radius:999px;background:rgba(255,255,255,.05);color:var(--dim);font-weight:700;border:1px solid var(--line)}
.nat{
  display:none;margin-top:10px;padding:11px 13px;border-radius:12px;
  background:rgba(255,212,138,.08);border:1px solid rgba(255,212,138,.22);
  font-size:13px;line-height:1.9;color:#ffe7bb;
}
.nat.show{display:block;animation:pop .25s ease both}

.status{margin:20px 0 0;text-align:center;font-size:12.5px;color:var(--dim);line-height:1.9;min-height:20px}
.status.err{color:#ffb4c0}
.spin{display:inline-block;width:13px;height:13px;margin-right:7px;vertical-align:-2px;
  border:2px solid rgba(110,231,255,.28);border-top-color:var(--accent);border-radius:50%;animation:sp .7s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}

footer{max-width:860px;margin:0 auto;padding:10px 16px 60px;text-align:center;color:var(--dim);font-size:12px;line-height:2}
footer a{color:var(--accent)}
.fine{font-size:11px;opacity:.7;margin-top:14px}

.toast{
  position:fixed;left:50%;bottom:26px;transform:translate(-50%,18px);z-index:60;
  padding:12px 20px;border-radius:999px;background:#fff;color:#0b0d18;font-size:13px;font-weight:800;
  opacity:0;pointer-events:none;transition:.26s;max-width:90vw;text-align:center;
}
.toast.show{opacity:1;transform:translate(-50%,0)}

@media (prefers-reduced-motion:reduce){*{animation-duration:.01ms !important;transition-duration:.01ms !important}}