/* Mobile-only layout and interaction overrides.
 * app.css remains the visual source of truth; keep shared colors, typography,
 * borders and component styling inherited so desktop changes flow to mobile.
 */

@media (max-width: 700px) {
    .problem-state-options label,
    .problem-sort-direction label,
    .problem-property-options label {
        min-height: 44px;
    }

    .operations-topline { grid-template-columns: minmax(0, 1fr); }
    .operations-metrics { gap: 8px; margin: 16px 0; }
    .operations-heading .source-title-row { flex-direction: row; align-items: center; }
    .operations-heading .button-secondary-link { width: auto; }
    .operations-disclosure > summary { min-height: 44px; }

    .button-danger {
        min-height: 44px;
    }

    input:not([type="hidden"]):not([type="checkbox"]):not([type="radio"]):not([type="range"]),
    select,
    .problem-filter-row .problem-search-input {
        min-height: 44px;
        font-size: 16px;
    }

    .source-title-row {
        align-items: center;
        flex-direction: row;
    }

    .source-title-row > .button-secondary-link {
        width: auto;
    }

    .source-title-row > div:not(.submission-page-actions) {
        flex-basis: 100%;
    }

    .submission-page-actions .button-secondary-link {
        width: 100%;
        text-align: center;
    }

    .statement-header-row {
        align-items: stretch;
        flex-direction: column;
    }

    .statement-view-actions {
        width: 100%;
    }

    .statement-view-actions .segmented-option {
        flex: 1;
        min-width: 0;
    }

    .statement-preview {
        padding: 18px 16px;
    }

    .statement-preview-content {
        font-size: 15px;
        line-height: 1.8;
    }

    .container {
        padding: 18px 12px;
    }

    .card {
        padding: 16px;
    }

    .page-title {
        font-size: 23px;
    }

    .problem-title-main {
        font-size: 25px;
    }

    .problem-search-form {
        align-items: stretch;
        flex-direction: column;
    }

    .problem-search-input,
    .problem-difficulty-select {
        width: 100%;
    }

    .error-card {
        margin: 32px auto;
        padding: 32px 22px;
    }

    .error-code {
        font-size: 56px;
    }

    .error-title {
        font-size: 24px;
    }

    .error-actions {
        flex-direction: column;
    }

    .button-primary-link,
    .button-secondary-link {
        width: 100%;
        text-align: center;
    }

    .request-editor-tabs a {
        padding: 8px 10px;
        font-size: 13px;
    }

    .card > form .form-row {
        align-items: stretch;
        flex-direction: column;
        gap: 6px;
    }

    .card > form .form-row label {
        min-width: 0;
    }

    .card > form .form-row input:not([type="checkbox"]),
    .card > form .form-row select,
    .card > form .form-row > .tag-editor,
    .card > form .form-row > .language-picker,
    .card > form .form-row > textarea {
        width: 100%;
        min-width: 0;
    }

    .problem-meta {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .problem-meta > div {
        display: grid;
        gap: 1px;
        min-width: 0;
        overflow-wrap: anywhere;
    }

    details.problem-spoiler > summary,
    .problem-spoiler > .problem-spoiler-content {
        min-height: 44px;
    }

    .soj-ad-slot {
        min-height: 80px;
        margin: 16px 0;
    }

    .problem-list-table .col-problem-stat {
        display: none;
    }

    .problem-list-mobile-stats {
        display: flex;
        flex-wrap: wrap;
        gap: 4px 8px;
        margin-top: 4px;
        overflow-wrap: anywhere;
    }

    .home-search-controls input {
        min-height: 44px;
        font-size: 16px;
    }

    .home-section-heading > a {
        display: inline-flex;
        align-items: center;
        min-height: 44px;
    }

    .site-footer-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .site-footer a {
        min-height: 44px;
        min-width: 44px;
    }

    .site-footer-links {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        width: 100%;
        gap: 0 16px;
    }

    .sample-block {
        grid-template-columns: minmax(0, 1fr);
        gap: 16px;
    }

    .header-inner {
        display: grid;
        grid-template-columns: auto minmax(0, 1fr);
        align-items: center;
        gap: 6px 10px;
        padding: 12px 10px 10px;
    }

    .header-right {
        display: contents;
    }

    .nav {
        grid-column: 1 / -1;
        grid-row: 2;
        width: 100%;
        min-width: 0;
        flex-wrap: nowrap;
        gap: 4px;
        overflow-x: auto;
        overscroll-behavior-inline: contain;
        scrollbar-width: none;
        -webkit-overflow-scrolling: touch;
    }

    .nav::-webkit-scrollbar,
    .pagination::-webkit-scrollbar,
    .request-editor-tabs::-webkit-scrollbar {
        display: none;
    }

    .nav a {
        display: inline-flex;
        flex: 0 0 auto;
        align-items: center;
        min-height: 44px;
        padding: 0 10px;
    }

    .management-menu {
        flex-shrink: 0;
    }

    .management-menu summary,
    .account-menu summary,
    .compact-action,
    .segmented-option {
        min-height: 44px;
        min-width: 44px;
    }

    .suggestion-field textarea {
        font-size: 16px;
    }

    .auth-area {
        grid-column: 2;
        grid-row: 1;
        justify-content: flex-end;
        flex-wrap: nowrap;
        width: 100%;
        min-width: 0;
        gap: 6px;
    }

    .login-button,
    .logout-button {
        display: inline-flex;
        align-items: center;
        min-height: 44px;
    }

    .logout-form {
        display: flex;
    }

    .account-menu {
        min-width: 32px;
        max-width: min(32vw, 180px);
        white-space: nowrap;
    }

    textarea {
        font-size: 16px;
    }

    .button-primary,
    .button-primary-link,
    .button-secondary-link,
    .copy-button,
    .request-editor-tabs a,
    .problem-edit-request-button {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-height: 44px;
    }

    .back-link {
        display: inline-flex;
        align-items: center;
        min-height: 44px;
        margin-bottom: 8px;
    }

    .problem-card {
        padding: 16px;
    }

    .problem-title-main,
    .profile-title,
    .profile-description {
        overflow-wrap: anywhere;
    }

    .info-table code {
        white-space: pre-wrap;
        overflow-wrap: anywhere;
    }

    .table-scroll > .info-table th,
    .table-scroll > .info-table td {
        display: table-cell;
        width: auto;
    }

    .table-scroll > .tag-catalog-table {
        min-width: 480px;
    }

    .table-scroll > .author-list-table {
        min-width: 700px;
    }

    .environment-table {
        min-width: 800px;
    }

    .request-list-table {
        min-width: 700px;
    }

    .admin-request-list-table {
        min-width: 820px;
    }

    .home-stats {
        grid-template-columns: repeat(auto-fit, minmax(min(100%, 6em), 1fr));
        gap: 8px;
    }

    .stat-card {
        min-width: 0;
        padding: 14px 6px;
    }

    .stat-value {
        font-size: 24px;
    }

    .stat-label {
        font-size: 12px;
    }

    .problem-filter-summary {
        min-height: 44px;
    }

    .problem-filter-actions {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 6px 10px;
        align-items: center;
    }

    .problem-filter-actions .button-primary {
        width: 100%;
        min-height: 44px;
        grid-column: 1 / -1;
    }

    .auth-area .logout-form,
    .auth-area .login-button {
        flex-shrink: 0;
    }

    .submission-search-form {
        align-items: stretch;
        gap: 10px;
    }

    .submission-search-form .search-field {
        flex: 0 1 auto;
    }

    .submission-search-form select.problem-search-input {
        min-height: 44px;
        font-size: 16px;
    }

    .problem-search-form .button-primary,
    .problem-search-form .problem-search-reset {
        min-height: 44px;
        text-align: center;
    }

    .problem-search-reset {
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 44px;
    }

    .difficulty-range-slider {
        height: 48px;
        margin-top: 0;
    }

    .difficulty-range-slider::before,
    .difficulty-range-slider::after {
        top: 21px;
    }

    .difficulty-range-slider input[type="range"]::-webkit-slider-runnable-track {
        height: 32px;
    }

    .difficulty-range-slider input[type="range"]::-moz-range-track {
        height: 32px;
    }

    .difficulty-range-slider input[type="range"]::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
        margin-top: 4px;
    }

    .difficulty-range-slider input[type="range"]::-moz-range-thumb {
        width: 22px;
        height: 22px;
    }

    .problem-table {
        min-width: 0;
        table-layout: fixed;
    }

    .problem-table th,
    .problem-table td {
        padding: 11px 5px;
    }

    .problem-table .col-id {
        width: 52px;
    }

    .problem-table .col-difficulty {
        width: 108px;
        white-space: nowrap;
    }

    table.home-problem-table .col-difficulty {
        width: min(7.5em, 40%);
        white-space: normal;
    }

    .home-problem-table details > summary {
        white-space: normal;
    }

    .problem-table .problem-title {
        display: block;
        white-space: normal;
        overflow-wrap: anywhere;
    }

    .submission-table {
        width: 100%;
        min-width: 0;
        table-layout: fixed;
    }

    .submission-table th,
    .submission-table td {
        padding: 11px 5px;
    }

    .submission-table .col-lang,
    .submission-table .col-time,
    .submission-table .col-memory,
    .submission-table .col-created {
        display: none;
    }

    .submission-table .col-id {
        width: 72px;
    }

    .submission-table .col-problem {
        width: 52px;
    }

    .submission-table .col-user {
        width: 92px;
    }

    .submission-table .col-status {
        width: auto;
    }

    .submission-share-link {
        display: none;
    }

    .submission-page-actions {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }

    .submission-table td.col-user a,
    .submission-table td.col-user span {
        display: block;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .submission-meta .meta-label {
        display: block;
        min-width: 0;
        margin-bottom: 4px;
    }

    .submit-card .form-row label {
        width: auto;
    }

    .submit-card .language-picker,
    .submit-card .language-search,
    .submit-card .language-options {
        width: 100%;
        min-width: 0;
    }

    .language-option {
        display: flex;
        align-items: center;
        min-height: 44px;
    }

    .submit-actions {
        display: grid;
        gap: 8px;
    }

    .submit-actions .button-primary {
        width: 100%;
        min-height: 48px;
    }

    .code-input:not(#sourceCode) {
        min-height: 220px;
    }

    .profile-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .profile-stat {
        min-height: 76px;
    }

    .profile-description-edit-trigger,
    .profile-result-stat {
        min-height: 44px;
    }

    .profile-description-input {
        font-size: 16px;
    }

    .profile-problem-list {
        grid-template-columns: 1fr;
    }

    .pagination {
        justify-content: flex-start;
        overflow-x: auto;
        overscroll-behavior-inline: contain;
        gap: 6px;
        padding: 2px 0 6px;
        scrollbar-width: none;
        -webkit-overflow-scrolling: touch;
    }

    .pagination a {
        display: inline-flex;
        flex: 0 0 auto;
        align-items: center;
        justify-content: center;
        min-width: 44px;
        min-height: 44px;
    }

    .pagination .page-info,
    .pagination-ellipsis {
        flex: 0 0 auto;
    }

    .submission-pagination {
        flex-wrap: wrap;
    }

    .ranking-table {
        width: 100%;
        min-width: 0;
        table-layout: fixed;
    }

    .ranking-table th,
    .ranking-table td {
        display: table-cell;
        width: auto;
    }

    .ranking-table .ranking-col-status,
    .ranking-table .ranking-col-submissions,
    .ranking-table .ranking-col-authored {
        display: none;
    }

    .ranking-table th:nth-child(1),
    .ranking-table td:nth-child(1) {
        width: 46px;
    }

    .ranking-table th:nth-child(2),
    .ranking-table td:nth-child(2) {
        width: auto;
        min-width: 0;
    }

    .ranking-table th:nth-child(4),
    .ranking-table td:nth-child(4),
    .ranking-table th:nth-child(7),
    .ranking-table td:nth-child(7) {
        width: 72px;
    }

    .ranking-user {
        gap: 6px;
        min-width: 0;
    }

    .ranking-avatar {
        width: 28px;
        height: 28px;
    }

    .request-editor-tabs {
        gap: 5px;
        flex-wrap: nowrap;
        overflow-x: auto;
        overscroll-behavior-inline: contain;
        scrollbar-width: none;
        -webkit-overflow-scrolling: touch;
    }

    .request-editor-tabs a {
        flex: 0 0 auto;
        white-space: nowrap;
    }

    .request-modal-backdrop {
        padding: 10px;
    }

    .request-modal {
        max-height: calc(100dvh - 20px);
        padding: 16px;
    }

    .request-modal-close {
        width: 44px;
        height: 44px;
    }

    .request-modal-actions {
        display: grid;
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .request-modal-actions .button-primary,
    .request-modal-actions .button-secondary-link {
        width: 100%;
    }

    .problem-page-actions .button-secondary-link {
        width: auto;
    }

    .request-review-grid > div {
        align-items: flex-start;
        flex-direction: column;
        gap: 6px;
    }

    .home-actions {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .home-actions > a {
        flex: 1 1 120px;
        width: auto;
    }

    .request-test-toolbar,
    .polygon-test-actions {
        flex-wrap: wrap;
    }

    .polygon-test-actions {
        width: 100%;
    }

    .polygon-test-actions > .button-secondary-link,
    .polygon-test-actions form {
        flex: 1 1 120px;
        min-width: 0;
    }

    .polygon-test-actions form .button-secondary-link {
        width: 100%;
    }

}

@media (max-width: 560px) {
    .profile-header {
        align-items: flex-start;
    }

    .profile-avatar {
        width: 58px;
        height: 58px;
    }

    .profile-title {
        font-size: 22px;
    }

    .profile-result-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .profile-problem-item {
        grid-template-columns: 44px minmax(0, 1fr);
    }

    .profile-problem-item > .problem-spoiler {
        grid-column: 2;
        justify-self: start;
    }

}

@media (max-width: 420px) {
    .nav a {
        padding-right: 9px;
        padding-left: 9px;
    }

    .problem-table .col-id {
        width: 46px;
    }

    .problem-table .col-difficulty {
        width: 96px;
    }

    .problem-table th,
    .problem-table td,
    .submission-table th,
    .submission-table td {
        font-size: 13px;
    }

    .submission-table .col-user {
        display: none;
    }

    .submission-table .col-id {
        width: 64px;
    }

    .submission-table .col-problem {
        width: 50px;
    }

    .home-stats {
        gap: 6px;
    }

    .stat-card {
        padding-right: 5px;
        padding-left: 5px;
    }

}