:root {
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --primary-light: #e0e7ff;
  --bg: #f4f6f8;
  --card-bg: #ffffff;
  --text-main: #1f2937;
  --text-sub: #6b7280;
  --border: #e5e7eb;
  --sidebar-bg: #17202b;
  --danger: #dc2626;
  --success: #16a34a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;
  background: var(--bg);
  color: var(--text-main);
}

.layout { display: flex; min-height: 100vh; }

/* ---------- 사이드바 ---------- */
.sidebar {
  width: 220px;
  background: var(--sidebar-bg);
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  padding: 20px 14px;
  flex-shrink: 0;
}
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 6px 20px; }
.brand-badge {
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--primary); color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center; font-size: 16px;
}
.brand-title { font-weight: 700; font-size: 14px; color: #fff; }
.brand-sub { font-size: 11px; color: #94a3b8; }
.menu { display: flex; flex-direction: column; gap: 2px; margin-top: 6px; }
.menu-item {
  text-align: left; background: none; border: none; color: #cbd5e1;
  padding: 10px 12px; border-radius: 8px; font-size: 13.5px; cursor: pointer;
}
.menu-item:hover { background: #202b38; }
.menu-item.active { background: var(--primary); color: #fff; font-weight: 600; }
.sidebar-footer { margin-top: auto; padding-top: 20px; border-top: 1px solid #2a3542; }
.sync-status { font-size: 11px; color: #64748b; }
.sync-status.ok { color: #86efac; }
.sync-status.error { color: #fca5a5; }

/* ---------- 메인 ---------- */
.main { flex: 1; padding: 22px 28px 60px; min-width: 0; }
.page.hidden { display: none; }

.topbar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 20px; flex-wrap: wrap; gap: 10px;
}
.topbar h1 { font-size: 20px; margin: 0; }
.subtitle { font-size: 12.5px; color: var(--text-sub); margin: 2px 0 0; }

/* ---------- 입력 행 ---------- */
.add-row { display: flex; gap: 8px; margin-bottom: 18px; flex-wrap: wrap; }
.add-row input[type="text"] {
  flex: 1; min-width: 180px; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 13.5px;
}
.add-row input[type="date"], .add-row input[type="time"] {
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 13.5px;
}
.btn-primary {
  background: var(--primary); color: #fff; border: none; padding: 10px 18px;
  border-radius: 8px; font-size: 13.5px; font-weight: 600; cursor: pointer;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost {
  background: none; border: 1px solid var(--border); color: var(--text-sub);
  padding: 7px 12px; border-radius: 8px; font-size: 12.5px; cursor: pointer;
}
.btn-ghost:hover { background: #fff; }
.btn-icon {
  background: #fff; border: 1px solid var(--border); width: 30px; height: 30px;
  border-radius: 8px; font-size: 15px; cursor: pointer; color: var(--text-main);
}

/* ---------- 할일 목록 ---------- */
.todo-section { margin-bottom: 22px; }
.todo-section h3 {
  font-size: 13.5px; color: var(--text-sub); margin: 0 0 10px;
  display: flex; align-items: center; gap: 8px;
}
.count {
  background: var(--primary-light); color: var(--primary-dark); font-size: 11px;
  font-weight: 700; padding: 1px 8px; border-radius: 20px;
}
.todo-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.todo-item {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 14px; display: flex; align-items: center; gap: 12px;
}
.todo-item .checkbox {
  width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--border);
  cursor: pointer; flex-shrink: 0; display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 12px; background: #fff;
}
.todo-item .checkbox.checked { background: var(--success); border-color: var(--success); }
.todo-item .text { flex: 1; font-size: 13.5px; }
.todo-list.done .todo-item .text { text-decoration: line-through; color: var(--text-sub); }
.todo-item .due {
  font-size: 11px; color: var(--text-sub); background: #f1f5f9; padding: 3px 8px; border-radius: 6px;
  white-space: nowrap;
}
.todo-item .due.overdue { color: var(--danger); background: #fee2e2; }
.todo-item .delete-btn {
  border: none; background: none; color: var(--text-sub); cursor: pointer; font-size: 15px;
  padding: 2px 6px; border-radius: 6px;
}
.todo-item .delete-btn:hover { background: #fee2e2; color: var(--danger); }
.empty-note { color: var(--text-sub); font-size: 12.5px; padding: 10px 2px; }

/* ---------- 캘린더 ---------- */
.month-nav { display: flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 600; }
.calendar-wrap {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; margin-bottom: 16px;
}
.calendar-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; }
.calendar-grid.weekdays-only { margin-bottom: 6px; }
#calendarWeekdays { margin-bottom: 8px; }
.weekday-cell { text-align: center; font-size: 11.5px; color: var(--text-sub); font-weight: 600; padding: 4px 0; }
.day-cell {
  min-height: 64px; border: 1px solid var(--border); border-radius: 8px; padding: 6px;
  cursor: pointer; font-size: 12px; position: relative; background: #fff;
}
.day-cell:hover { background: #f8f9fb; }
.day-cell.outside { opacity: 0.35; }
.day-cell.today { border-color: var(--primary); border-width: 2px; }
.day-cell.selected { background: var(--primary-light); border-color: var(--primary); }
.day-cell .day-num { font-weight: 600; }
.day-cell .day-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--primary); position: absolute; bottom: 6px; left: 6px; }
.day-cell .day-events-mini { font-size: 10px; color: var(--primary-dark); margin-top: 4px; line-height: 1.3; }

.panel {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px;
  padding: 18px 20px; margin-top: 16px;
}
.panel h3 { font-size: 13.5px; margin: 0 0 12px; }

.event-list { list-style: none; margin: 10px 0 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.event-item {
  display: flex; align-items: center; gap: 10px; background: #f8f9fb; border-radius: 8px;
  padding: 9px 12px; font-size: 13px;
}
.event-item .event-date { font-size: 11px; color: var(--text-sub); min-width: 70px; }
.event-item .event-time { font-size: 11px; color: var(--primary-dark); font-weight: 600; min-width: 44px; }
.event-item .event-title { flex: 1; }
.event-item .delete-btn {
  border: none; background: none; color: var(--text-sub); cursor: pointer; font-size: 14px;
  padding: 2px 6px; border-radius: 6px;
}
.event-item .delete-btn:hover { background: #fee2e2; color: var(--danger); }

@media (max-width: 900px) {
  .sidebar { display: none; }
  .day-cell { min-height: 48px; }
}