body {
    font-family: Arial, sans-serif;
    background-color: #0d1117;
    color: #c9d1d9;
    padding: 20px;
}

h2 {
    text-align: center;
    color: #f0f6fc;
}

form {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

label {
    font-weight: bold;
    color: #f0f6fc;
}

input, select, button {
    padding: 8px;
    margin-top: 5px;
    background-color: #0d1117;
    color: #c9d1d9;
    border: 1px solid #30363d;
    color-scheme: dark;
}

button {
    background-color: #238636;
    color: white;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background-color: #2ea043;
}

input[readonly] {
    background-color: #161b22;
    color: #c9d1d9;
}

/* ===== DARK THEME CHO SELECT2 ===== */

/* 1. Khung chọn (selection box) */
.select2-container--default .select2-selection--single {
    background-color: #0d1117 !important;
    border: 1px solid #30363d !important;
    border-radius: 6px !important;
    height: 36px !important;
}

/* 2. Văn bản đã chọn */
.select2-container--default .select2-selection--single .select2-selection__rendered {
    color: #c9d1d9 !important;
    line-height: 36px !important;
}

/* 3. Placeholder */
.select2-container--default .select2-selection--single .select2-selection__placeholder {
    color: #8b949e !important;
}

/* 4. Mũi tên xuống (caret) - chuyển sang màu trắng */
.select2-container--default .select2-selection--single .select2-selection__arrow b {
    border-color: #8b949e transparent transparent transparent !important;
}

/* 5. Dropdown (danh sách thả xuống) */
.select2-dropdown {
    background-color: #161b22 !important;
    border: 1px solid #30363d !important;
    border-radius: 6px !important;
}

/* 6. Ô tìm kiếm trong dropdown */
.select2-search--dropdown {
    background-color: #0d1117 !important;
    padding: 8px !important;
}

.select2-search__field {
    background-color: #0d1117 !important;
    color: #c9d1d9 !important;
    border: 1px solid #30363d !important;
    border-radius: 6px !important;
    padding: 6px 10px !important;
}

.select2-search__field:focus {
    outline: none !important;
    border-color: #58a6ff !important;
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.3) !important;
}

/* 7. Danh sách kết quả */
.select2-results {
    background-color: #161b22 !important;
}

.select2-results__option {
    color: #c9d1d9 !important;
    padding: 8px 12px !important;
}

/* 8. Khi di chuột vào một option */
.select2-results__option--highlighted {
    background-color: #1f3a5f !important;
    color: #58a6ff !important;
}

/* 9. Option đang được chọn */
.select2-results__option[aria-selected="true"] {
    background-color: #0d1117 !important;
    color: #58a6ff !important;
}

/* 10. Thanh cuộn (tùy chọn) */
.select2-results::-webkit-scrollbar {
    width: 6px;
}
.select2-results::-webkit-scrollbar-track {
    background: #161b22;
}
.select2-results::-webkit-scrollbar-thumb {
    background: #30363d;
    border-radius: 10px;
}
.select2-results::-webkit-scrollbar-thumb:hover {
    background: #484f58;
}