:root{
  --bg:#0b0d13; --fg:#e9eef5; --muted:#a9b3c0; --card:#121625; --accent:#5ee1a0;
  --border:#242a3a; --btn:#1b2134; --btn-hover:#232b41;
  --primary:#5ee1a0; --primary-fg:#072017;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Helvetica,Arial,sans-serif;
  background:linear-gradient(180deg,#0a0d14 0%, #0b0d13 100%); color:var(--fg);
}
.topbar{
  display:flex; justify-content:space-between; align-items:center;
  padding:16px 20px; border-bottom:1px solid var(--border); background:#0c0f18c7; backdrop-filter:blur(6px);
  position:sticky; top:0; z-index:10;
}
.topbar h1{margin:0; font-size:18px; letter-spacing:.3px}
.container{max-width:980px; margin:20px auto; padding:0 16px}
.card-row{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
.card{
  background:var(--card); border:1px solid var(--border); border-radius:16px; padding:16px;
  box-shadow:0 10px 24px rgba(0,0,0,.25);
}
.card-title{font-size:12px; color:var(--muted); text-transform:uppercase; letter-spacing:.12em}
.note-text, .interval-text{
  font-variant-numeric:tabular-nums; font-size:32px; margin:10px 0 14px; min-height:40px;
}
.blur{filter:blur(8px); color:#93a0b57a; user-select:none}
.controls{display:flex; gap:12px; align-items:center; margin:18px 0}
button{
  background:var(--btn); color:var(--fg); border:1px solid var(--border); padding:10px 14px;
  border-radius:12px; cursor:pointer; transition:.15s transform,.15s background;
  text-align: center;
  min-width: 8em;
  min-height: 4em;
}
button:hover{background:var(--btn-hover)}
button.primary{background:var(--primary); color:var(--primary-fg); border-color:transparent; font-weight:600}
button.primary:hover{filter:brightness(1.15)}
button.ghost{background:transparent}
.hint{color:var(--muted); font-size:12px}
.footer{
  max-width:980px; margin:40px auto 60px; padding:0 16px; color:var(--muted);
  display:flex; justify-content:space-between; font-size:12px;
}

/* dialog */
dialog{
  border:1px solid var(--border); background:var(--card); color:var(--fg); border-radius:16px; padding:0; width:min(720px,92vw)
}
dialog::backdrop{background:rgba(0,0,0,.45); backdrop-filter:blur(2px)}
#settings-form{padding:18px}
#settings-form h2{margin:0 0 10px}
fieldset{border:1px solid var(--border); border-radius:12px; padding:12px 14px; margin:12px 0}
legend{color:var(--muted); font-size:12px; padding:0 6px}
.grid2{display:grid; grid-template-columns:1fr 1fr; gap:10px}
label{display:block}
label.row{display:flex; align-items:center; gap:10px}
input[type="text"], input[list]{
  width:100%; background:#0e1220; color:var(--fg); border:1px solid var(--border); border-radius:8px; padding:8px
}
.interval-pool{display:grid; grid-template-columns:repeat(auto-fill,minmax(110px,1fr)); gap:8px}
.interval-pool label{display:flex; gap:8px; align-items:center; padding:6px 8px; border:1px solid var(--border); border-radius:10px; background:#0f1423}
menu{display:flex; gap:8px; justify-content:flex-end; margin-top:12px}
small{color:var(--muted)}
@media (max-width:860px){
  .card-row{grid-template-columns:1fr}
}