:root {
  color-scheme: light;
  --ink: #2a2049; --muted: #6b6285; --line: #e3ddf4; --violet: #6d3fd6; --violet-soft: #efe8fc;
  --surface: #fff; --bg: #f7f5fc; --danger: #b3261e; --danger-soft: #fdecea;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: "Noto Sans JP", system-ui, -apple-system, sans-serif; color: var(--ink); background: var(--bg); }
header { background: rgba(255,255,255,.94); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 2; }
.topbar { max-width: 1080px; margin: 0 auto; padding: 18px 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.brand { color: var(--ink); font-weight: 800; text-decoration: none; letter-spacing: .02em; }
nav { display: flex; gap: 8px; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 700; padding: 8px 12px; border-radius: 10px; }
nav a[aria-current="page"] { color: var(--violet); background: var(--violet-soft); }
main { max-width: 1080px; margin: 0 auto; padding: 56px 24px 80px; }
.eyebrow { color: var(--violet); font-weight: 800; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; }
h1 { margin: 10px 0 10px; font-size: clamp(32px,5vw,52px); line-height: 1.18; letter-spacing: -.03em; }
.lead { margin: 0 0 40px; color: var(--muted); font-size: 16px; line-height: 1.8; max-width: 680px; }

.cal-header { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; flex-wrap: wrap; }
.cal-nav-btn { border: 1px solid var(--line); background: var(--surface); color: var(--violet); font-size: 16px; font-weight: 800; width: 36px; height: 36px; border-radius: 10px; cursor: pointer; }
.cal-nav-btn:hover { background: var(--violet-soft); }
.cal-month-label { font-size: 20px; font-weight: 800; letter-spacing: -.01em; min-width: 130px; }
.cal-status { margin-left: auto; font-size: 12px; font-weight: 700; padding: 6px 10px; border-radius: 999px; }
.cal-status.online { color: var(--violet); background: var(--violet-soft); }
.cal-status.offline { color: #a66314; background: #fff5df; }

.cal-grid { border: 1px solid var(--line); border-radius: 18px; overflow: hidden; background: var(--surface); box-shadow: 0 12px 36px rgba(42,32,73,.06); margin-bottom: 32px; }
.cal-grid-row { display: grid; grid-template-columns: repeat(7, 1fr); }
.cal-grid-head { background: var(--violet-soft); }
.cal-weekday { text-align: center; font-size: 12px; font-weight: 800; color: var(--violet); padding: 10px 0; }
.cal-cell { border: 0; border-top: 1px solid var(--line); border-right: 1px solid var(--line); background: var(--surface); padding: 10px 6px; min-height: 56px; display: flex; flex-direction: column; align-items: center; gap: 4px; cursor: pointer; font-family: inherit; }
.cal-grid-row .cal-cell:last-child { border-right: 0; }
.cal-cell:hover { background: var(--violet-soft); }
.cal-cell-outside { color: var(--muted); opacity: .5; }
.cal-cell-selected { background: var(--violet-soft); box-shadow: inset 0 0 0 2px var(--violet); }
.cal-cell-day { font-size: 13px; font-weight: 700; font-variant-numeric: tabular-nums; }
.cal-cell-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--violet); }

.cal-columns { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 20px; }
.cal-card { background: var(--surface); border: 1px solid var(--line); border-radius: 22px; padding: 24px 26px; box-shadow: 0 12px 36px rgba(42,32,73,.06); }
.cal-card h2 { font-size: 16px; margin: 0 0 16px; }

.cal-form-row { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.cal-form-row label { font-size: 12px; font-weight: 700; color: var(--muted); }
.cal-input, .cal-select, .cal-textarea { border: 1px solid var(--line); border-radius: 10px; padding: 9px 11px; font-size: 14px; font-family: inherit; color: var(--ink); background: var(--surface); }
.cal-textarea { resize: vertical; }
.cal-input:focus, .cal-select:focus, .cal-textarea:focus { outline: 2px solid var(--violet); outline-offset: 1px; }
.cal-form-error { color: var(--danger); font-size: 12px; font-weight: 700; min-height: 16px; margin-bottom: 8px; }
.cal-submit-btn { width: 100%; border: 0; background: var(--violet); color: #fff; font-weight: 800; font-size: 14px; padding: 11px 0; border-radius: 10px; cursor: pointer; }
.cal-submit-btn:hover { opacity: .92; }
.cal-submit-btn:disabled { opacity: .6; cursor: default; }

.cal-upcoming-list { display: flex; flex-direction: column; gap: 12px; max-height: 420px; overflow-y: auto; }
.cal-upcoming-row { display: flex; gap: 12px; align-items: flex-start; border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; }
.cal-upcoming-date { flex-shrink: 0; width: 76px; font-weight: 800; font-size: 13px; color: var(--violet); font-variant-numeric: tabular-nums; }
.cal-upcoming-body { flex: 1; min-width: 0; }
.cal-upcoming-title { font-weight: 700; font-size: 14px; }
.cal-upcoming-note { color: var(--muted); font-size: 12.5px; line-height: 1.6; margin-top: 2px; }
.cal-upcoming-meta { color: var(--muted); font-size: 11px; margin-top: 4px; }
.cal-delete-btn { flex-shrink: 0; border: 1px solid var(--danger-soft); background: var(--danger-soft); color: var(--danger); font-size: 11px; font-weight: 700; padding: 5px 9px; border-radius: 8px; cursor: pointer; }
.cal-delete-btn:hover { opacity: .85; }
.cal-empty { color: var(--muted); font-size: 13px; padding: 12px 0; }

.note { margin-top: 28px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.note a { color: var(--violet); }

@media (max-width: 720px) {
  .topbar { align-items: flex-start; flex-direction: column; }
  main { padding-top: 36px; }
  .cal-columns { grid-template-columns: 1fr; }
  .cal-cell { min-height: 44px; }
}