.calendar-header{display:flex;justify-content:space-between;align-items:center;padding:1rem;background-color:#f5f5f5;border-bottom:1px solid #ddd;height:60px;box-sizing:border-box}.header-left{display:flex;align-items:center;gap:.8em}.logo{height:36px}.title{font-size:1.2em;font-weight:700;color:#333;letter-spacing:.5px}.lang-dropdown{position:relative}.dropdown-menu{position:absolute;right:0;top:100%;min-width:100px;max-height:200px;overflow-y:auto;background:#fff;border:none;z-index:10;box-shadow:0 2px 8px #0000001a;border-radius:8px;padding:4px 0}.dropdown-menu li{list-style:none;padding:8px 16px;cursor:pointer;border:none;background:transparent;transition:background .2s;border-radius:6px;font-size:1em}.dropdown-menu li:hover{background:#f0f0f0}.schoolyear-btn,.i18n-btn{border:none;background:transparent;padding:6px;border-radius:6px;cursor:pointer;transition:background .2s}.schoolyear-btn:hover,.i18n-btn:hover{background:#f0f0f0}