.model-select {
    --ms-bg: var(--background);
    --ms-bg-elevated: var(--background);
    --ms-surface: color-mix(in srgb, var(--background) 94%, var(--text-color) 6%);
    --ms-surface-hover: var(--hover);
    --ms-surface-active: color-mix(in srgb, var(--background) 88%, var(--text-color) 12%);
    --ms-border: var(--border-color);
    --ms-border-strong: color-mix(in srgb, var(--border-color) 72%, var(--text-color) 28%);
    --ms-text: var(--text-color);
    --ms-text-secondary: var(--text-color-secondary);
    --ms-text-tertiary: var(--text-color-tertiary);
    --ms-accent: var(--primary-color, var(--text-color));
    --ms-accent-soft: color-mix(in srgb, var(--primary-color, var(--text-color)) 12%, transparent);
    --ms-focus-ring: color-mix(in srgb, var(--primary-color, var(--text-color)) 24%, transparent);
    --ms-alpha: var(--pending);
    --ms-alpha-bg: color-mix(in srgb, var(--pending) 14%, transparent);
    --ms-beta: var(--primary-color, var(--text-color));
    --ms-beta-bg: color-mix(in srgb, var(--primary-color, var(--text-color)) 10%, transparent);
    --ms-danger: var(--error-color);
    --ms-shadow-md: 0 8px 28px var(--shadow-color), 0 2px 6px color-mix(in srgb, var(--shadow-color) 65%, transparent);
    --ms-shadow-tooltip: 0 14px 40px var(--shadow-color), 0 2px 8px color-mix(in srgb, var(--shadow-color) 70%, transparent);
    --ms-radius-sm: 8px;
    --ms-radius-md: 12px;
    --ms-radius-lg: 16px;
    --ms-radius-pill: 999px;
    --ms-ease: cubic-bezier(0.16, 1, 0.3, 1);
    --ms-trans: 0.18s var(--ms-ease);
    position: relative;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.model-select.split-screen-hidden {
    width: 0;
    min-width: 0;
    height: 0;
    overflow: visible;
}

.model-select.split-screen-hidden > .model-select-button {
    display: none;
}

.model-select-button {
    appearance: none;
    background: var(--ms-bg);
    color: var(--ms-text);
    height: 36px;
    padding: 0 12px 0 14px;
    border-radius: var(--ms-radius-pill);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13.5px;
    font-weight: 500;
    letter-spacing: -0.01em;
    cursor: pointer;
    max-width: 280px;
    transition: background var(--ms-trans), border-color var(--ms-trans), box-shadow var(--ms-trans);
}

.model-select-button:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--ms-focus-ring);
}

@media (hover: hover) and (pointer: fine) {
    .model-select-button:hover {
        background: var(--ms-surface-hover);
    }
}

.model-select[aria-expanded="true"] .model-select-button {
    background: var(--ms-surface-hover);
}

.model-select-label {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    min-width: 0;
    max-width: 220px;
    overflow: hidden;
}

/* Header placeholder shown only while the initial model list is unresolved. */
.model-select-trigger-skeleton {
    display: block;
    width: 112px;
    height: 12px;
    border-radius: 6px;
    background-color: var(--ms-border);
    animation: skeleton-pulse 1.5s infinite ease-in-out;
    pointer-events: none;
}

.label-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.label-icon svg,
.label-icon img {
    width: 100%;
    height: 100%;
    min-width: 18px;
    min-height: 18px;
    object-fit: contain;
    display: block;
}

.model-select-label .label-name {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.2;
}

.model-select-trigger-status,
.model-select-item-status {
    font-size: 9.5px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 700;
    flex-shrink: 0;
}

.model-select-trigger-status.alpha,
.model-select-item-status.alpha {
    background: var(--ms-alpha-bg);
    color: var(--ms-alpha);
}

.model-select-trigger-status.experimental,
.model-select-trigger-status.beta,
.model-select-item-status.experimental,
.model-select-item-status.beta {
    background: var(--ms-beta-bg);
    color: var(--ms-beta);
}

.model-select-chevron {
    width: 14px;
    height: 14px;
    color: var(--ms-text-tertiary);
    flex-shrink: 0;
    transition: transform var(--ms-trans);
}

.model-select[aria-expanded="true"] .model-select-chevron {
    transform: rotate(180deg);
}

.model-select-backdrop {
    position: fixed;
    inset: 0;
    background: transparent;
    z-index: 1190;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--ms-trans), background var(--ms-trans);
}

.model-select-backdrop.active {
    opacity: 1;
    pointer-events: auto;
}

.model-select-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    width: 380px;
    max-height: min(560px, 70vh);
    background: var(--ms-bg-elevated);
    border: 1px solid var(--ms-border);
    border-radius: var(--ms-radius-lg);
    box-shadow: var(--ms-shadow-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    z-index: 1200;
    opacity: 0;
    transform: translateY(-6px) scale(0.985);
    transform-origin: top left;
    pointer-events: none;
    visibility: hidden;
    transition: opacity var(--ms-trans), transform var(--ms-trans), visibility var(--ms-trans);
}

.model-select-dropdown.open {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
    visibility: visible;
}

.model-select-dropdown.model-select-dropdown--anchored {
    position: fixed;
    top: 0;
    left: 0;
}

.model-select-drag-handle,
.model-select-mobile-header {
    display: none;
}

.model-select-main-panel {
    display: flex;
    flex-direction: column;
    /*
     * The panel must participate in the dropdown's flex sizing. Without this,
     * WebKit gives the nested scrolling list its content height and then clips
     * the last model rows at the bottom of the translated mobile sheet.
     */
    flex: 1 1 auto;
    min-height: 0;
    overflow: hidden;
}

.model-select-head {
    padding: 12px 12px 8px;
    border-bottom: 1px solid var(--ms-border);
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex-shrink: 0;
}

.model-select-search-row {
    width: 100%;
}

.model-select-search-control {
    position: relative;
    display: flex;
    align-items: center;
}

.model-select-search-icon {
    position: absolute;
    left: 12px;
    width: 14px;
    height: 14px;
    color: var(--ms-text-tertiary);
    pointer-events: none;
}

.model-select-search-input {
    width: 100%;
    height: 38px;
    padding: 0 36px 0 34px;
    border: 1px solid var(--ms-border);
    background: var(--ms-surface);
    color: var(--ms-text);
    border-radius: var(--ms-radius-md);
    font-size: 13.5px;
    outline: none;
    transition: background var(--ms-trans), border-color var(--ms-trans), box-shadow var(--ms-trans);
}

.model-select-search-input::placeholder {
    color: var(--ms-text-tertiary);
}

.model-select-search-input:focus {
    border-color: var(--ms-border-strong);
    background: var(--ms-bg);
    box-shadow: 0 0 0 3px var(--ms-focus-ring);
}

.model-select-search-clear {
    position: absolute;
    right: 8px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: transparent;
    border: none;
    display: none;
    align-items: center;
    justify-content: center;
    color: var(--ms-text-tertiary);
    cursor: pointer;
}

.model-select-search-clear svg {
    width: 12px;
    height: 12px;
}

.model-select-search-clear.is-visible {
    display: inline-flex;
}

@media (hover: hover) and (pointer: fine) {
    .model-select-search-clear:hover {
        background: var(--ms-surface-hover);
        color: var(--ms-text);
    }
}

.model-select-filters {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.model-select-filter-group {
    display: flex;
    align-items: center;
    gap: 6px;
    overflow-x: auto;
    scrollbar-width: none;
    padding: 1px 0;
}

.model-select-filter-group::-webkit-scrollbar {
    display: none;
}

.model-select-filter-label {
    font-size: 10.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ms-text-tertiary);
    flex-shrink: 0;
    width: 28px;
}

.model-select-filter-chip {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    height: 24px;
    padding: 0 10px;
    border-radius: var(--ms-radius-pill);
    background: var(--ms-surface);
    border: 1px solid transparent;
    color: var(--ms-text-secondary);
    font-size: 11.5px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: background var(--ms-trans), color var(--ms-trans), border-color var(--ms-trans);
}

.model-select-filter-chip svg {
    width: 11px;
    height: 11px;
}

@media (hover: hover) and (pointer: fine) {
    .model-select-filter-chip:hover {
        background: var(--ms-surface-hover);
        color: var(--ms-text);
    }
}

.model-select-filter-chip.is-active {
    background: var(--ms-accent);
    border-color: var(--ms-accent);
    color: var(--background);
}

.model-select-list {
    overflow-y: auto;
    overflow-x: hidden;
    padding: 6px;
    flex: 1;
    min-height: 0;
    overscroll-behavior-y: contain;
    scrollbar-width: thin;
    scrollbar-color: var(--ms-border-strong) transparent;
}

.model-select-list::-webkit-scrollbar {
    width: 8px;
}

.model-select-list::-webkit-scrollbar-thumb {
    background: var(--ms-border-strong);
    border-radius: 4px;
    border: 2px solid var(--ms-bg-elevated);
}

.model-select-list::-webkit-scrollbar-track {
    background: transparent;
}

.model-select-section-label {
    padding: 10px 12px 6px;
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ms-text-tertiary);
}

.model-select-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--ms-radius-md);
    cursor: pointer;
    transition: background var(--ms-trans), box-shadow var(--ms-trans);
    position: relative;
    outline: none;
}

@media (hover: hover) and (pointer: fine) {
    .model-select-item:hover {
        background: var(--ms-surface-hover);
    }
}

.model-select-item.active {
    background: var(--ms-accent-soft);
}

.model-select-item.search-highlight,
.model-select-item:focus-visible {
    background: var(--ms-surface-hover);
    box-shadow: 0 0 0 2px var(--ms-focus-ring);
}

.model-select-item-left {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    flex: 1;
}

.model-select-item-left-svg {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--ms-surface);
    border: 1px solid var(--ms-border);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--ms-text-secondary);
}

.model-select-item-left-svg svg,
.model-select-item-left-svg img {
    width: 18px;
    height: 18px;
    object-fit: contain;
    display: block;
}

.model-select-item-left-text {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.model-select-name-row {
    display: flex;
    align-items: center;
    gap: 6px;
    min-width: 0;
}

.model-select-name {
    font-size: 13.5px;
    font-weight: 600;
    color: var(--ms-text);
    letter-spacing: -0.01em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.model-select-desc {
    font-size: 11.5px;
    color: var(--ms-text-secondary);
    line-height: 1.4;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.model-select-item-right {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-shrink: 0;
}

.model-select-check {
    width: 16px;
    height: 16px;
    color: var(--ms-text);
    opacity: 0;
    flex-shrink: 0;
    transition: opacity var(--ms-trans);
}

.model-select-item.active .model-select-check {
    opacity: 1;
}

.model-select-pin-btn {
    width: 24px;
    height: 24px;
    border: none;
    border-radius: var(--ms-radius-pill);
    background: transparent;
    color: var(--ms-text-tertiary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    cursor: pointer;
    transition: background-color var(--ms-trans), color var(--ms-trans), transform var(--ms-trans);
}

.model-select-pin-btn svg {
    width: 14px;
    height: 14px;
    display: block;
}

.model-select-pin-btn:focus-visible {
    color: var(--ms-accent);
    background: var(--ms-accent-soft);
    outline: none;
}

.model-select-pin-btn:active {
    transform: scale(0.96);
}

.model-select-pin-btn.is-pinned {
    color: var(--ms-accent);
}

@media (hover: hover) and (pointer: fine) {
    .model-select-pin-btn:hover,
    .model-select-pin-btn.is-pinned:hover {
        color: var(--ms-accent);
        background: var(--ms-accent-soft);
    }
}

.model-select-warning-container,
.model-select-capabilities-list,
.model-select-capability {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.model-select-capabilities-list {
    gap: 6px;
}

.model-select-capability svg {
    width: 16px;
    height: 16px;
}

#iconCapabilityWarning svg {
    fill: var(--ms-alpha);
}

.model-select-warning {
    cursor: help;
}

.model-select-empty {
    text-align: center;
    padding: 36px 20px;
    color: var(--ms-text-tertiary);
    font-size: 12.5px;
    line-height: 1.5;
    user-select: none;
    cursor: default;
}

.model-select-loading {
    padding: 10px 6px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.model-select-skeleton {
    height: 52px;
    border-radius: var(--ms-radius-md);
    background: linear-gradient(90deg, var(--ms-surface) 0%, var(--ms-surface-hover) 50%, var(--ms-surface) 100%);
    background-size: 200% 100%;
    animation: model-select-skeleton 1.4s ease-in-out infinite;
}

@keyframes model-select-skeleton {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.model-select-detail {
    position: fixed;
    z-index: 1300;
    width: 320px;
    background: var(--ms-bg-elevated);
    border: 1px solid var(--ms-border);
    border-radius: var(--ms-radius-lg);
    box-shadow: var(--ms-shadow-tooltip);
    padding: 16px;
    pointer-events: none;
    opacity: 0;
    transform: translateY(-4px);
    visibility: hidden;
    transition: opacity var(--ms-trans), transform var(--ms-trans), visibility var(--ms-trans);
}

.model-select-detail.is-visible {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
}

.model-select-detail-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.model-select-detail-icon {
    width: 32px;
    height: 32px;
    border-radius: 9px;
    background: var(--ms-surface);
    border: 1px solid var(--ms-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ms-text-secondary);
    flex-shrink: 0;
}

.model-select-detail-icon svg,
.model-select-detail-icon img {
    width: 20px;
    height: 20px;
    display: block;
    object-fit: contain;
}

.model-select-detail-title {
    flex: 1;
    min-width: 0;
}

.model-select-detail-name {
    font-size: 14px;
    font-weight: 700;
    color: var(--ms-text);
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.model-select-detail-provider {
    font-size: 11px;
    color: var(--ms-text-tertiary);
    margin-top: 2px;
}

.model-select-detail-desc {
    font-size: 12px;
    color: var(--ms-text-secondary);
    line-height: 1.5;
    margin-bottom: 12px;
}

.model-select-detail-section {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 10px;
}

.model-select-detail-section:last-child {
    margin-bottom: 0;
}

.model-select-detail-section-label {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--ms-text-tertiary);
}

.model-select-format-row,
.model-select-icon-row,
.model-select-stat-row,
.model-select-item-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.model-select-format-pill,
.model-select-tool-empty,
.model-select-icon-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.model-select-format-pill,
.model-select-tool-empty {
    gap: 4px;
    height: 22px;
    padding: 0 8px;
    background: var(--ms-surface);
    border: 1px solid var(--ms-border);
    border-radius: var(--ms-radius-pill);
    font-size: 11px;
    font-weight: 500;
    color: var(--ms-text-secondary);
}

.model-select-format-pill svg {
    width: 11px;
    height: 11px;
}

.model-select-arrow {
    color: var(--ms-text-tertiary);
    display: inline-flex;
    align-items: center;
}

.model-select-arrow svg {
    width: 12px;
    height: 12px;
}

.model-select-icon-chip {
    width: 26px;
    height: 26px;
    border-radius: 7px;
    background: var(--ms-surface);
    border: 1px solid var(--ms-border);
    color: var(--ms-text-secondary);
}

.model-select-icon-chip svg {
    width: 13px;
    height: 13px;
}

.model-select-stat {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    color: var(--ms-text);
    font-weight: 600;
}

.model-select-stat svg {
    width: 12px;
    height: 12px;
    color: var(--ms-text-tertiary);
}

.model-select-stat-unit {
    color: var(--ms-text-tertiary);
    font-weight: 400;
}

.model-select-item-meta {
    display: none;
}

.model-select-portal-dropdown,
.model-select-hover-item,
.model-select-sub-panel,
.model-select-sub-panel-list,
.model-select-sub-panel-header {
    display: none;
}

@media (max-width: 600px) {
    .model-select-button {
        padding: 0 8px;
    }

    .model-select-label .label-name,
    .model-select-trigger-skeleton,
    .model-select-trigger-status {
        display: none;
    }

    .model-select-label {
        gap: 0;
    }
}

@container chat-layout (max-width: 560px) {
    .model-select-button {
        padding: 0 8px;
    }

    .model-select-label .label-name,
    .model-select-trigger-skeleton,
    .model-select-trigger-status {
        display: none;
    }

    .model-select-label {
        gap: 0;
    }
}

@media (max-width: 768px) {
    .model-select-backdrop {
        background: transparent;
        transition: background 0.28s var(--ms-ease), opacity 0.28s var(--ms-ease);
    }

    .model-select-backdrop.active {
        background: color-mix(in srgb, var(--text-color) 40%, transparent);
        backdrop-filter: blur(2px);
        -webkit-backdrop-filter: blur(2px);
    }

    .model-select-dropdown {
        position: fixed;
        top: auto;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100%;
        max-width: 100%;
        max-height: 88vh;
        max-height: 88dvh;
        border-radius: 20px 20px 0 0;
        border-bottom: none;
        opacity: 1;
        transform: translateY(100%);
        transform-origin: bottom center;
        padding-bottom: env(safe-area-inset-bottom, 0px);
        transition: transform 0.32s var(--ms-ease), visibility 0.32s var(--ms-ease);
        will-change: transform;
    }

    .model-select-dropdown.open {
        transform: translateY(0);
    }

    .model-select-drag-handle {
        display: flex;
        justify-content: center;
        padding: 8px 0 0;
        flex-shrink: 0;
        touch-action: none;
    }

    .model-select-drag-handle-bar {
        width: 38px;
        height: 4px;
        border-radius: 2px;
        background: var(--ms-border-strong);
    }

    .model-select-mobile-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 8px 16px 4px;
        flex-shrink: 0;
    }

    .model-select-mobile-title {
        font-size: 14px;
        font-weight: 700;
        color: var(--ms-text);
    }

    .model-select-mobile-close {
        width: 28px;
        height: 28px;
        border-radius: 50%;
        background: var(--ms-surface);
        border: none;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        color: var(--ms-text-secondary);
        cursor: pointer;
    }

    .model-select-mobile-close svg {
        width: 14px;
        height: 14px;
    }

    .model-select-head {
        padding: 8px 12px;
    }

    .model-select-list {
        padding: 8px;
        -webkit-overflow-scrolling: touch;
        touch-action: pan-y;
    }

    .model-select-detail {
        display: none !important;
    }

    .model-select-item {
        flex-wrap: wrap;
        padding: 12px;
    }

    .model-select-item-meta {
        display: flex;
        gap: 8px;
        margin-top: 8px;
        width: 100%;
    }
}

.model-select-dropdown.dragging {
    transition: none !important;
}

@media (prefers-reduced-motion: reduce) {
    .model-select-dropdown,
    .model-select-backdrop,
    .model-select-button,
    .model-select-filter-chip,
    .model-select-search-input,
    .model-select-detail {
        transition: none !important;
    }

    .model-select-skeleton,
    .model-select-trigger-skeleton {
        animation: none !important;
    }
}