:root{
  --bg:#f6f8fb; --card:#fff; --muted:#6b7280; --accent:#0b5fff;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:#0f172a}
nav{display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;background:linear-gradient(90deg,#ffffffcc,#f0f4ffcc);border-bottom:1px solid #e6eefc}
.nav-links{display:flex;gap:1rem;font-size:.9rem}
.nav-links a{text-decoration:none;color:var(--accent);}
.nav-links a:hover{text-decoration:underline;}
.container{display:grid;grid-template-columns:1fr 1fr;gap:1rem;padding:1.25rem;align-items:start}
.panel{background:var(--card);padding:1rem;border-radius:12px;box-shadow:0 4px 12px rgba(11,30,70,.06)}
.before .mock-wheel{height:140px;border-radius:8px;border:1px dashed #ddd;display:flex;align-items:center;justify-content:space-around;padding:1rem;margin-top:.5rem}
.mock-wheel .wheel-item{opacity:.6}
.mock-wheel .large{font-weight:700;color:var(--accent);opacity:1}
.before .explain{font-size:.9rem;color:var(--muted);margin-top:.5rem}

.after .controls{display:flex;align-items:center;gap:1rem;margin-bottom:.75rem}
#metrics{font-family:monospace;color:var(--muted)}
.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:.5rem;padding:0.5rem;background:linear-gradient(180deg,#fbfdff,#ffffff);border-radius:8px}
.day{background:#fff;padding:.5rem;border-radius:6px;min-height:70px;border:1px solid #eef2ff;cursor:pointer;display:flex;flex-direction:column;gap:6px}
.day .date{font-weight:600}
.event{font-size:.85rem;padding:.15rem .25rem;border-radius:6px;background:#eef2ff;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.event.optional{opacity:.7;border:1px dashed #c4d1ff}
.event.cancelled{text-decoration:line-through;opacity:.5;border:1px dotted #f7b0b0;background:#fff0f0}

.event-panel{position:sticky;top:1rem;padding:1rem;background:var(--card);border-radius:12px}
.event-panel form{display:flex;flex-direction:column;gap:.5rem}
.event-panel input[type="text"], .event-panel input[type="time"]{padding:.5rem;border:1px solid #e6eefc;border-radius:6px}

footer{padding:1rem;text-align:center;color:var(--muted)}
@media(max-width:900px){.container{grid-template-columns:1fr;}.calendar-grid{grid-template-columns:repeat(4,1fr)}}
@media(max-width:520px){.calendar-grid{grid-template-columns:repeat(2,1fr)}}