body { background: radial-gradient(circle at top, #1f2933 0, #020308 55%, #000 100%); overflow-x: hidden; font-family: sans-serif; }
    
    /* 로고 폰트 규격 통일 */
    .logo-font { font-size: 1.25rem; font-weight: 900; font-style: italic; tracking-tighter; }

    /* 사이드바 애니메이션 */
    #sidebar { transition: transform 0.3s ease-in-out; z-index: 100; }
    .sidebar-open { transform: translateX(0); }
    .sidebar-closed { transform: translateX(-100%); }

    summary::-webkit-details-marker { display: none; }

    .calendar-th { font-size: 1.1rem !important; font-weight: 700 !important; padding-bottom: 0.4em; color: #e5e7eb; }
    .calendar-bold-day { color: #fff; font-weight: 700; }
    .calendar-thin-day { color: #6b7280; }
    .selected { background: #facc15 !important; color: #111827 !important; border-radius: 999px; }

    .preset-btn { border: 1px solid rgba(255,255,255,0.14); background: rgba(255,255,255,0.03); transition: all .12s ease; backdrop-filter: blur(10px); border-radius: 12px; }
    .preset-btn.active { background-color: #facc15; color: #111827; border-color: #facc15; }
    
    .card { background: rgba(15, 23, 42, 0.7); border: 1px solid rgba(255, 255, 255, 0.1); }