@media (max-width: 900px) {
    .desktop-only {
        display: none !important;
    }

    .mobile-only {
        display: inline !important;
    }

    .selection-grid,
    .session-body {
        grid-template-columns: minmax(0, 1fr);
    }

    .session-progress {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 6px;
        align-items: stretch;
    }

    .selection-sidebar,
    .selection-main,
    .selection-summary-panel,
    .session-card,
    .session-side {
        min-height: auto;
    }

    .selection-main,
    .theme-stack,
    .selection-sidebar,
    .selection-summary-panel,
    .selection-grid {
        overflow: visible;
    }

    .selection-categories {
        max-height: 260px;
    }

    .theme-stack {
        gap: 10px;
    }
}

@media (max-width: 900px) {

    .selection-modal,
    .session-modal {
        align-items: flex-start;
        padding: 0;
    }

    .selection-modal,
    .session-modal {
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .selection-shell,
    .session-shell {
        position: relative;
        width: 100%;
        min-height: 100vh;
        max-height: none;
        padding: 12px;
        border: 0;
        border-radius: 0;
        overflow: auto;
    }

    .selection-shell {
        display: block;
        min-height: auto;
        overflow: visible;
    }

    .session-header {
        display: grid;
        grid-template-columns: minmax(0, 1fr);
        align-items: start;
        gap: 10px;
    }

    .selection-header {
        position: relative !important;
        display: flex !important;
        flex-direction: row !important;
        flex-wrap: nowrap !important;
        align-items: center !important;
        justify-content: flex-start !important;
        gap: 8px !important;
        padding-right: 48px !important;
        overflow: visible !important;
    }

    .selection-header-content {
        display: flex !important;
        flex-direction: row !important;
        align-items: center !important;
        justify-content: flex-start !important;
        text-align: left !important;
        flex: 0 1 auto !important;
        min-width: 0 !important;
    }

    .info-tooltip-container {
        position: static !important;
    }

    .info-tooltip-content {
        top: 100% !important;
        left: 16px !important;
        right: 16px !important;
        transform: none !important;
        width: auto !important;
        max-width: none !important;
        margin-top: 8px !important;
    }

    .selection-header .section-label {
        white-space: nowrap;
        flex-shrink: 1;
    }

    .rating-level-tabs {
        display: flex !important;
        flex-wrap: nowrap !important;
        flex: 1 1 auto !important;
        min-width: 0 !important;
        justify-content: flex-end;
    }

    .selection-header>div,
    .session-header>div {
        gap: 4px;
    }

    .selection-subtitle,
    .session-subtitle {
        margin-top: 2px;
        font-size: 0.92rem;
        line-height: 1.35;
    }

    .selection-close,
    .session-header .button {
        min-height: 40px;
        padding: 8px 12px;
        white-space: nowrap;
    }

    .session-header {
        position: relative;
        padding-right: 52px;
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    .session-close {
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        right: 0;
        z-index: 22;
    }

    .session-close::before {
        content: "×";
        font-size: 1.45rem;
        font-weight: 900;
        line-height: 1;
    }

    .session-header .section-label,
    .session-subtitle {
        display: none;
    }

    .session-header h2 {
        margin: 0;
        font-size: clamp(1.25rem, 6.8vw, 1.9rem);
        line-height: 1.1;
    }

    .session-close::before {
        content: none;
    }



    .selection-close {
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        right: 12px;
        z-index: 2;
    }

    .selection-header h2,
    .selection-subtitle {
        display: none;
    }

    .selection-header .section-label {
        display: block;
        font-size: 0.85rem;
        margin-bottom: 0;
        color: var(--ink);
        text-transform: none;
    }

    .rating-level-tabs {
        gap: 2px !important;
        padding: 2px !important;
        margin-left: auto;
    }

    .rating-level-tabs .button.tab {
        padding: 4px 2px;
        min-width: 0;
        flex: 1 1 0;
        font-size: 0.8rem;
    }

    .selection-mobile-fab,
    .selection-mobile-back {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .selection-mobile-back {
        min-height: 40px;
        padding: 8px 12px;
    }

    .selection-summary,
    .session-progress {
        gap: 8px;
    }

    .selection-summary {
        display: flex;
        flex-wrap: nowrap;
        gap: 8px;
        overflow-x: auto;
        padding-bottom: 8px;
    }

    .selection-summary {
        padding-bottom: 2px;
        scrollbar-width: none;
        display: flex;
        flex-wrap: nowrap;
        justify-content: space-between;
        gap: 4px;
    }

    .selection-summary::-webkit-scrollbar {
        display: none;
    }

    .selection-summary .selection-pill {
        flex: 1 1 0;
        min-width: 0;
        width: auto;
    }

    .selection-pill {
        flex: 1 1 0;
        min-width: 0;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        min-height: 48px;
        padding: 6px 4px;
        gap: 2px;
        text-align: center;
    }

    .selection-pill span {
        font-size: 0.6rem;
        line-height: 1.1;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 100%;
        display: block;
    }

    .selection-pill strong {
        font-size: 0.9rem;
    }

    .selection-grid,
    .session-body {
        gap: 10px;
    }

    .selection-grid {
        display: block;
        grid-template-columns: 1fr;
    }

    .session-body {
        min-height: auto;
        align-content: start;
    }

    .selection-sidebar {
        order: 1;
        margin-bottom: 10px;
    }

    .selection-main {
        order: 2;
        margin-bottom: 10px;
    }

    .selection-summary-panel {
        order: 3;
    }

    .selection-sidebar,
    .selection-summary-panel,
    .theme-card,
    .session-side {
        padding: 12px;
    }

    .selection-search {
        display: none;
    }

    .session-card {
        padding: 12px 10px;
        gap: 8px;
    }

    .session-progress {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 6px;
    }

    .session-progress .selection-pill {
        min-height: 0;
        padding: 8px 6px;
        gap: 3px;
    }

    .session-progress .selection-pill span {
        font-size: 0.55rem;
        line-height: 1.05;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 100%;
        letter-spacing: 0;
    }

    .session-progress .selection-pill strong {
        font-size: 0.92rem;
    }

    .selection-main-header {
        gap: 8px;
    }

    .selection-main-header>div {
        width: 100%;
    }

    .selection-main-header p {
        display: none;
    }

    .selection-main-actions {
        display: none;
    }

    .selection-mobile-fab {
        position: absolute;
        right: 14px;
        bottom: calc(14px + env(safe-area-inset-bottom));
        z-index: 9;
        width: 58px;
        height: 58px;
        border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--line));
        border-radius: 50%;
        background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 92%, white 6%) 0%, var(--accent) 100%);
        color: white;
        font-size: 1.45rem;
        box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
    }

    .word-grid {
        grid-template-columns: 1fr;
    }

    .session-options,
    .session-options-grid {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 8px;
    }

    .session-option {
        width: 92%;
        padding: 8px 12px;
        font-size: 1.05rem;
        min-height: 40px;
        text-align: center;
    }

    .session-chunk-pool {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }

    .session-chunk-pool .session-option {
        width: auto;
        padding: 6px 14px;
    }

    .selection-summary-panel {
        position: sticky;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 10;
        display: none;
        grid-template-rows: auto auto;
        gap: 10px;
        padding: 12px 12px calc(12px + env(safe-area-inset-bottom));
        border-radius: 24px 24px 0 0;
        background: color-mix(in srgb, var(--surface) 96%, var(--selection-card));
        box-shadow: 0 -4px 32px rgba(0, 0, 0, 0.12);
        border-top: 1px solid var(--line);
    }

    .selection-modal.is-mobile-theme-step .selection-summary-panel,
    .selection-summary-panel.is-mobile-open {
        display: grid;
    }

    .srs-selection-summary-panel {
        background: color-mix(in srgb, var(--surface) 96%, var(--selection-card)) !important;
        backdrop-filter: none !important;
        display: grid !important;
    }

    .selection-categories {
        max-height: none;
        overflow: visible;
    }

    .category-card-progress {
        display: none;
    }

    .selection-summary-panel .section-label,
    .selection-summary-panel h3,
    .selection-summary-panel .selection-summary-text,
    .selection-summary-panel .selection-chips,
    .selection-summary-panel .selection-summary-stats {
        display: none;
    }

    .selection-summary-panel .action-row {
        margin-top: 0;
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    .selection-summary-panel .action-row .button {
        min-height: 44px;
    }

    .batch-size-switch {
        width: auto;
        min-width: 146px;
        justify-content: space-between;
        padding: 4px;
    }

    .batch-size-btn {
        min-width: 38px;
        min-height: 38px;
    }

    .selection-shell {
        padding-bottom: calc(14px + env(safe-area-inset-bottom));
    }

    .selection-modal.is-mobile-category-step .selection-main,
    .selection-modal.is-mobile-category-step .selection-mobile-fab,
    #srs-selection-modal:not(.is-mobile-theme-step) .selection-main {
        display: none;
    }

    .selection-modal.is-mobile-theme-step .selection-sidebar {
        display: none;
    }

    #archive-modal .selection-main-header>div {
        display: none !important;
    }

    #archive-modal .selection-main-header {
        border-bottom: none !important;
        padding-bottom: 8px !important;
        margin-bottom: 8px !important;
    }

    .selection-modal.is-mobile-theme-step .selection-main {
        display: grid;
        grid-template-rows: auto auto;
        align-content: start;
        gap: 10px;
        padding: 10px;
        padding-bottom: 72px;
        border: 1px solid var(--line);
        border-radius: 20px;
        background: color-mix(in srgb, var(--surface) 90%, transparent);
        box-shadow: 0 10px 26px rgba(23, 32, 51, 0.06);
        overflow: visible;
    }

    .is-mobile-theme-card {
        padding: 0;
        border-radius: 18px;
        background: color-mix(in srgb, var(--surface) 96%, transparent);
        overflow: hidden;
    }

    .mobile-theme-toggle {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        padding: 14px;
        border: 0;
        background: transparent;
        color: inherit;
        font: inherit;
        text-align: left;
    }

    .mobile-theme-body {
        padding: 0 12px 14px;
    }

    .selection-modal.is-mobile-theme-step .theme-stack {
        display: grid;
        align-content: start;
        gap: 10px;
        padding-bottom: 52px;
        overflow: visible;
    }

    .selection-modal.is-mobile-theme-step .selection-shell {
        padding-bottom: calc(14px + env(safe-area-inset-bottom));
        -webkit-overflow-scrolling: touch;
        overflow: visible;
    }

    .selection-modal.is-mobile-theme-step .selection-mobile-fab,
    .selection-modal.is-mobile-category-step .selection-mobile-fab,
    #srs-selection-modal .selection-mobile-fab {
        display: none !important;
    }

    .selection-modal.is-mobile-theme-step .theme-stack::after {
        content: "";
        display: block;
        height: 24px;
    }

    .selection-main-header {
        display: flex;
        align-items: center;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 6px;
    }



    .selection-mobile-back {
        order: 1;
        flex: 0 0 auto;
        width: auto !important;
        padding: 6px 8px;
        font-size: 0.75rem;
        white-space: nowrap;
    }

    .selection-main-actions {
        display: flex !important;
        order: 2;
        flex: 1 0 auto !important;
        flex-direction: row !important;
        width: auto !important;
        flex-wrap: nowrap !important;
        justify-content: flex-end;
        gap: 6px;
    }

    .selection-main-actions .button {
        padding: 6px 8px;
        font-size: 0.75rem;
        white-space: nowrap;
        flex: 0 0 auto !important;
    }

    .selection-main-header>div:not(.selection-main-actions) {
        order: 3;
        flex: 1 1 100%;
        width: 100%;
        margin-top: 4px;
    }

    .session-side p.section-label,
    .session-side h3,
    .session-side .session-chip-list {
        display: none;
    }

    .session-side.panel {
        position: sticky;
        bottom: 0;
        z-index: 4;
        background: color-mix(in srgb, var(--surface) 96%, var(--selection-card));
        border: 1px solid var(--line);
        border-radius: 16px;
        padding: 10px;
        box-shadow: 0 -10px 26px rgba(0, 0, 0, 0.12);
    }

    .selection-chips,
    .session-chip-list {
        max-height: none;
        overflow: visible;
    }

    .session-word {
        font-size: clamp(1.65rem, 8vw, 2.4rem);
    }

    .session-option {
        min-height: 48px;
        padding: 10px 12px;
    }

    .session-stage-four-note {
        display: none;
    }

    .session-stage-four-panel {
        gap: 10px;
    }

    .session-context-block {
        padding: 10px 12px;
        gap: 6px;
    }

    .session-context-head {
        gap: 8px;
        flex-wrap: wrap;
    }

    .session-tts-button {
        width: 34px;
        height: 34px;
    }

    .session-word {
        font-size: clamp(1.35rem, 7vw, 1.95rem);
        line-height: 1.02;
    }

    .session-word.is-stage-two {
        font-size: 0.98rem;
        line-height: 1.4;
    }

    .session-stage-four-hint-toolbar {
        display: flex;
        flex-direction: row;
        flex-wrap: nowrap;
        justify-content: center;
        width: 100%;
        gap: 4px;
    }

    .session-stage-four-segment {
        width: auto;
        flex: 1 1 auto;
        justify-content: center;
    }

    .session-stage-four-segment .button.is-compact {
        min-height: 32px;
        padding: 5px 8px;
    }

    .session-stage-four-actions {
        gap: 8px;
    }

    .session-stage-four-actions .button {
        width: 100%;
        min-height: 42px;
    }

    .session-stage-four-hint-trigger {
        width: 46px;
        min-width: 46px;
        height: 46px;
        min-height: 46px;
        font-size: 1.15rem;
    }

    .session-stage-four-hint-modal {
        padding: 12px;
    }

    .session-stage-four-hint-dialog {
        width: min(100%, 360px);
        max-height: calc(100vh - 28px);
        padding: 14px;
        border-radius: 18px;
    }

    .session-stage-four-hint-close {
        top: 10px;
        right: 10px;
        width: 38px;
        min-width: 38px;
        height: 38px;
        min-height: 38px;
    }

    .session-stage-four-hint-bubble {
        padding: 10px 12px;
    }

    .session-stage-four-input-wrap {
        gap: 6px;
    }

    .session-stage-four-input {
        min-height: 44px;
        padding: 10px 12px;
    }

    .session-completion {
        gap: 10px;
        padding: 12px 14px;
        border-radius: 18px;
    }

    .session-completion .section-label {
        font-size: 0.72rem;
    }

    .session-completion h3 {
        font-size: clamp(1.12rem, 5.6vw, 1.44rem);
        line-height: 1.08;
    }

    .session-completion p {
        font-size: 0.94rem;
        line-height: 1.32;
    }

    .session-completion-stats {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 8px;
    }

    .session-completion-stat {
        gap: 4px;
        padding: 10px 10px 12px;
        border-radius: 14px;
    }

    .session-completion-stat span {
        font-size: 0.62rem;
        line-height: 1.18;
    }

    .session-completion-stat strong {
        font-size: 1.02rem;
    }

    .session-stage-four-letter-strip {
        gap: 6px;
        min-height: 34px;
    }

    .session-stage-four-letter {
        min-width: 30px;
        min-height: 30px;
        padding: 4px 7px;
        font-size: 0.88rem;
    }

    .session-shell {
        padding-bottom: calc(124px + env(safe-area-inset-bottom));
    }

    .session-side .action-row {
        margin-top: 0;
        display: grid;
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .session-side .action-row .button {
        width: 100%;
        min-height: 44px;
    }
}

@media (max-width: 420px) {
    .selection-close {
        width: auto;
        min-width: 84px;
    }

    .selection-header {
        padding-right: 96px;
    }

    .selection-summary {
        gap: 6px;
    }

    .selection-pill {
        min-width: 84px;
        padding: 8px;
    }

    .selection-pill span {
        font-size: 0.62rem;
    }

    .selection-pill strong {
        font-size: 0.9rem;
    }

    .selection-main-header>div,
    .theme-card-header>div {
        gap: 4px;
    }

    .selection-summary-panel .action-row,
    .session-side .action-row {
        display: grid;
        grid-template-columns: 1fr;
    }

    .selection-categories {
        max-height: 220px;
    }

    .selection-summary-panel {
        left: 10px;
        right: 10px;
        bottom: calc(10px + env(safe-area-inset-bottom));
        padding: 10px;
    }

    .selection-summary-panel .action-row>.button {
        width: 100%;
    }

    .selection-mobile-fab {
        right: 10px;
        bottom: calc(10px + env(safe-area-inset-bottom));
        width: 54px;
        height: 54px;
    }

    .session-shell {
        padding: 10px;
        padding-bottom: calc(120px + env(safe-area-inset-bottom));
        gap: 10px;
    }

    .session-header {
        padding-right: 0;
    }

    .session-header h2 {
        font-size: clamp(1.08rem, 7vw, 1.55rem);
    }

    .session-header .button {
        min-width: 36px;
        min-height: 36px;
        padding: 0;
    }

    .session-progress {
        gap: 5px;
    }

    .session-progress .selection-pill {
        padding: 7px 5px;
    }

    .session-progress .selection-pill span {
        font-size: 0.52rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 100%;
        letter-spacing: 0;
    }

    .session-progress .selection-pill strong {
        font-size: 0.84rem;
    }

    .session-card {
        padding: 10px 8px;
        gap: 7px;
    }

    .session-context-block {
        padding: 9px 10px;
    }

    .session-word {
        font-size: clamp(1.18rem, 7vw, 1.6rem);
    }

    .session-stage-four-segment {
        padding: 2px;
        gap: 3px;
    }

    .session-stage-four-segment .button.is-compact {
        padding: 4px 7px;
        min-height: 30px;
        font-size: 0.86rem;
    }

    .session-stage-four-actions .button,
    .session-side .action-row .button {
        min-height: 40px;
    }

    .session-stage-four-input {
        min-height: 42px;
        padding: 9px 10px;
    }

    .session-completion {
        gap: 8px;
        padding: 10px 12px;
    }

    .session-completion h3 {
        font-size: 1rem;
    }

    .session-completion p {
        font-size: 0.88rem;
        line-height: 1.26;
    }

    .session-completion-stats {
        grid-template-columns: 1fr;
        gap: 7px;
    }

    .session-completion-stat {
        padding: 9px 10px 10px;
    }

    .session-stage-four-letter {
        min-width: 28px;
        min-height: 28px;
        padding: 3px 6px;
        font-size: 0.82rem;
    }

    .session-body {
        border: 1px solid var(--line) !important;
        border-radius: 20px !important;
        background: color-mix(in srgb, var(--surface) 86%, transparent) !important;
        overflow: hidden !important;
        padding: 0 !important;
        gap: 0 !important;
        display: flex !important;
        flex-direction: column !important;
    }

    .session-card {
        border: none !important;
        border-radius: 0 !important;
        background: transparent !important;
        padding: 16px 16px 8px 16px !important;
        gap: 2px !important;
        border-bottom: 1px solid var(--line) !important;
        box-shadow: none !important;
    }

    .session-side {
        border: none !important;
        border-radius: 0 !important;
        background: transparent !important;
        padding: 8px 16px 16px 16px !important;
        box-shadow: none !important;
        margin: 0 !important;
    }

    .session-admin-magic.is-docked {
        transform: translateY(-50%) translateX(40px);
    }
}