.region-dialog {
    position: fixed;
    inset: 0;
    z-index: 160;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 16px;
    padding-bottom: max(16px, env(safe-area-inset-bottom, 0px));
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition:
        opacity 0.25s ease,
        visibility 0.25s;
}

.region-dialog--open {
    pointer-events: auto;
    opacity: 1;
    visibility: visible;
}

body.region-dialog-open {
    overflow: hidden;
}

.region-dialog__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(11, 31, 69, 0.45);
}

.region-dialog__panel {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 480px;
    max-height: min(72vh, 560px);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transform: translateY(16px);
    transition: transform 0.25s ease;
}

.region-dialog--open .region-dialog__panel {
    transform: translateY(0);
}

.region-dialog__head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    padding: 22px 22px 18px;
    border-bottom: 1px solid var(--color-border-light);
    background: linear-gradient(180deg, var(--color-bg-tint) 0%, var(--color-surface) 100%);
}

.region-dialog__head-text {
    min-width: 0;
}

.region-dialog__title {
    margin: 0;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--color-primary);
}

.region-dialog__desc {
    margin: 6px 0 0;
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-text-secondary);
}

.region-dialog__close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
}

.region-dialog__close:hover {
    background: rgba(11, 31, 69, 0.06);
    color: var(--color-primary);
}

.region-dialog__close:focus-visible {
    outline: 2px solid var(--color-primary-light);
    outline-offset: 2px;
}

.region-dialog__search {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 18px;
    border-bottom: 1px solid var(--color-border-light);
    background: var(--color-surface);
}

.region-dialog__search-icon {
    flex-shrink: 0;
    color: var(--color-text-secondary);
}

.region-dialog__search-input {
    flex: 1;
    min-width: 0;
    padding: 0;
    border: none;
    background: transparent;
    font: inherit;
    font-size: 15px;
    line-height: 1.4;
    color: var(--color-text);
    outline: none;
}

.region-dialog__search-input::-webkit-search-cancel-button {
    -webkit-appearance: none;
}

.region-dialog__search-input::placeholder {
    color: #94A3B8;
}

.region-dialog__body {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

.region-dialog__list {
    margin: 0;
    padding: 10px;
    overflow-y: auto;
    list-style: none;
    flex: 1;
}

.region-dialog__group {
    margin: 0;
    padding: 0;
    list-style: none;
}

.region-dialog__group + .region-dialog__group,
.region-dialog__item + .region-dialog__group {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--color-border-light);
}

.region-dialog__group-label {
    padding: 6px 16px 8px;
    font-size: 11px;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
}

.region-dialog__group-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.region-dialog__empty {
    margin: 0;
    padding: 28px 24px 32px;
    font-size: 14px;
    line-height: 1.5;
    text-align: center;
    color: var(--color-text-secondary);
}

.region-dialog__option {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
    padding: 14px 16px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    font-size: 15px;
    font-weight: 500;
    line-height: 1.4;
    color: var(--color-text);
    text-align: left;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
}

.region-dialog__option::after {
    content: '';
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    border-radius: 50%;
    border: 1.5px solid var(--color-border);
    background: transparent;
    transition: border-color var(--transition), background var(--transition);
}

.region-dialog__option:hover {
    background: var(--color-bg-tint);
    color: var(--color-primary);
}

.region-dialog__option--active {
    background: rgba(11, 31, 69, 0.05);
    color: var(--color-primary);
    font-weight: 600;
}

.region-dialog__option--active::after {
    border-color: var(--color-accent);
    background: var(--color-accent) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='8' viewBox='0 0 10 8' fill='none'%3E%3Cpath d='M1 4L3.5 6.5L9 1' stroke='%230B1F45' stroke-width='1.75' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat center;
}

.region-dialog__option:focus-visible {
    outline: 2px solid var(--color-primary-light);
    outline-offset: -2px;
}

@media (min-width: 769px) {
    .region-dialog {
        align-items: center;
        padding: 24px;
    }

    .region-dialog__panel {
        max-height: min(80vh, 600px);
        transform: translateY(8px) scale(0.98);
    }

    .region-dialog--open .region-dialog__panel {
        transform: translateY(0) scale(1);
    }
}

@media (prefers-reduced-motion: reduce) {
    .region-dialog,
    .region-dialog__panel {
        transition: none;
    }
}