#airport-popup {
    position: absolute; width: 440px; background: #fff; box-sizing: border-box;
    border-radius: 12px; box-shadow: 0 10px 40px rgba(0,0,0,0.15);
    z-index: 999999; display: none; border: 1px solid #f0f0f0; overflow: hidden;
}

.airport-header {
    padding: 10px 14px; border-bottom: 1px solid #f1f5f9; background: #fff;
    display: flex; justify-content: space-between; align-items: center;
}
.airport-title { font-size: 14px; font-weight: 700; color: #334155; text-transform: uppercase; margin: 0; }
.airport-close {
    display: flex; align-items: center; justify-content: center;
    width: 28px; height: 28px; border-radius: 50%;
    background: #f1f5f9; color: #64748b; font-size: 16px; font-weight: bold; cursor: pointer; transition: all 0.2s;
}
.airport-close:active { background: #e0e7ff; color: #1a73e8; transform: scale(0.9); }

.airport-search { padding: 10px 14px; background: #fff; }
#airport-search-input { width: 100%; padding: 10px 14px; border: 1px solid #e2e8f0; background: #f8fafc; border-radius: 8px; font-size: 14px; font-weight: 500; outline: none; box-sizing: border-box; transition: 0.2s; }
#airport-search-input:focus { border-color: #3b82f6; background: #fff; box-shadow: 0 0 0 3px rgba(59,130,246,0.1); }

/* =========================================
   CỐ ĐỊNH CHIỀU CAO 240PX CHO VỪA VẶN IFRAME
========================================= */
.airport-content { display: flex; height: 265px; }

.airport-region, .airport-list { -ms-overflow-style: none; scrollbar-width: none; }
.airport-region::-webkit-scrollbar, .airport-list::-webkit-scrollbar { display: none; }

/* Trái: 9 khu vực cố định */
.airport-region { width: 33%; border-right: 1px solid #f1f5f9; overflow-y: auto; overflow-x: hidden; background: #f8fafc; }
.airport-region ul { list-style: none; padding: 4px 0; margin: 0; }
.airport-region li { 
    padding: 6px 12px; font-size: 13px; font-weight: 600; color: #64748b; 
    cursor: pointer; line-height: 1.2; transition: all 0.2s; margin-bottom: 1px;
}
.airport-region li:hover { color: #1a73e8; }
.airport-region li.active { background: #eef2f9; color: #1a73e8; font-weight: 700; border-left: 4px solid #1a73e8; box-sizing: border-box; }

/* Phải: Danh sách cuộn mượt mà */
.airport-list { width: 67%; overflow-y: auto; overflow-x: hidden; }
#airport-list-container { padding: 4px; }
.airport-item { padding: 8px; border-radius: 8px; cursor: pointer; display: flex; flex-direction: column; gap: 2px; transition: 0.2s; }
.airport-item:hover { background: #f1f5f9; }

.airport-city { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.airport-city-name { font-size: 14px; font-weight: 600; color: #334155; flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-right: 8px; }
.airport-iata { flex-shrink: 0; font-size: 12px; font-weight: 700; color: #475569; background: #e2e8f0; padding: 3px 6px; border-radius: 4px; }
.airport-name { font-size: 12px; font-weight: 500; color: #94a3b8; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }