* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin: 0;
  background: #f5f5f7;
  color: #1d1d1f;
}
header {
  background: #1d1d1f;
  color: #fff;
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header h1 { margin: 0; font-size: 20px; }
header nav { font-size: 14px; }
header nav span { margin-right: 12px; }
button.link {
  background: none;
  color: #4ea1ff;
  border: none;
  cursor: pointer;
  font-size: 14px;
  padding: 0;
}
main {
  max-width: 700px;
  margin: 24px auto;
  padding: 0 24px;
}
h2 { margin-top: 0; }
.error { color: #c0392b; }
.hint { color: #666; font-size: 13px; }

.login-card {
  max-width: 360px;
  margin: 80px auto;
  background: #fff;
  padding: 32px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,.08);
}
.login-card label { display: block; margin-bottom: 12px; font-size: 14px; }
.login-card input { width: 100%; padding: 8px; margin-top: 4px; border: 1px solid #ccc; border-radius: 4px; }
.login-card button {
  width: 100%; padding: 10px; background: #007aff; color: #fff;
  border: none; border-radius: 4px; cursor: pointer; font-size: 15px;
}
.login-card button:hover { background: #0062cc; }

.controls { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.controls button { padding: 6px 12px; background: #fff; border: 1px solid #ccc; border-radius: 4px; cursor: pointer; }
.range-form { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.range-form label { font-size: 14px; }
.range-form input { padding: 4px; }
.range-form button { padding: 6px 12px; background: #fff; border: 1px solid #ccc; border-radius: 4px; cursor: pointer; }
#month-label { font-weight: bold; min-width: 160px; text-align: center; }

#calendar { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; max-width: 600px; }
#calendar .dow { font-weight: bold; text-align: center; padding: 8px; background: #e5e5ea; border-radius: 4px; }
#calendar .day {
  background: #fff; padding: 12px 6px; text-align: center;
  border-radius: 4px; cursor: pointer; border: 1px solid transparent;
  user-select: none;
}
#calendar .day:hover { border-color: #007aff; }
#calendar .day.empty { background: transparent; cursor: default; }
#calendar .day.weekend { background: #f0f5ff; }
#calendar .day.holiday { background: #ffe5d0; }
#calendar .day.unavail { background: #ffd0d0 !important; font-weight: bold; }