*{box-sizing:border-box}
body{margin:0;font-family:system-ui,sans-serif;background:#eef3f1;color:#14281d}
header{position:sticky;top:0;z-index:5;background:#0f4c4a;color:#fff;padding:10px 10px 8px}
h1{margin:0 0 8px;font-size:19px;font-weight:700}
nav{display:flex;gap:6px}
nav button{flex:1;padding:10px 4px;border:0;border-radius:8px;background:#1d6663;color:#fff;font-size:14px}
nav .on{background:#f2a900;color:#14281d;font-weight:700}
main{padding:12px;max-width:720px;margin:auto}
.hint{font-size:13px;color:#4a5f55;margin:0 0 8px}
textarea,input{width:100%;padding:10px;font-size:16px;border:1px solid #b9c9c2;border-radius:8px;margin-bottom:8px;background:#fff;color:inherit}
.card{background:#fff;border-radius:10px;padding:10px 12px;margin-bottom:8px;border:1px solid #d3dfda;overflow-wrap:anywhere;cursor:pointer}
.card small{display:block;color:#6a7d73;font-size:11px}
.card b{display:block;font-weight:400;font-size:22px;margin-top:3px}
.row{display:flex;gap:8px;align-items:center;margin:8px 0;flex-wrap:wrap}
.row input[type=text],.row input:not([type]){flex:1;margin:0}
.row input[type=range]{width:130px;padding:0;margin:0}
button{font-size:14px}
.row button,#chars button{padding:9px 14px;border:1px solid #b9c9c2;border-radius:8px;background:#fff;color:#14281d}
.row button:disabled{opacity:.45}
.main{background:#0f4c4a!important;color:#fff!important;border:0!important}
#chars{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:8px}
#chars button{min-width:38px;padding:7px 4px}
#chars .done{border-color:#1f9d55;font-weight:700}
#chars .on{background:#f2a900;border-color:#f2a900}
canvas{display:block;width:100%;max-width:340px;margin:8px auto;background:#fff;border:2px solid #0f4c4a;border-radius:10px;touch-action:none}
#pv{font-size:40px;background:#fff;border-radius:10px;padding:10px;min-height:64px;overflow-wrap:anywhere;border:1px solid #d3dfda}
#toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:#14281d;color:#fff;padding:9px 18px;border-radius:20px;opacity:0;transition:opacity .2s;pointer-events:none;z-index:9}
#toast.show{opacity:1}
[hidden]{display:none!important}