/* Final mobile overflow guard: keep late Tethys skin rules from restoring desktop widths. */
  @media (max-width: 640px) {
    html,
    body {
      overflow-x: hidden;
    }

    .discussion-shell {
      width: 100%;
      max-width: 100vw;
      overflow-x: hidden;
      padding-left: 0.65rem;
      padding-right: 0.65rem;
    }

    .discussion-shell > *,
    .discussion-layout,
    .discussion-panel,
    .discussion-list,
    .discussion-toolbar {
      min-width: 0;
      max-width: 100%;
    }

    .discussion-layout {
      display: flex;
      flex-direction: column;
    }

    .discussion-list-side {
      order: -1;
      gap: 0.7rem;
    }

    .discussion-hero {
      max-width: 100%;
      overflow: hidden;
    }

    .discussion-hero h1,
    .discussion-hero p {
      overflow-wrap: anywhere;
    }

    .discussion-topbar {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
      gap: 0.48rem;
      padding-right: 3.35rem;
    }

    .discussion-topbar .discussion-btn.primary,
    .discussion-topbar .discussion-topbar-btn {
      min-width: 0;
      padding-inline: 0.74rem;
    }

    .discussion-profile {
      position: fixed;
      top: calc(3.75rem + env(safe-area-inset-top));
      right: max(0.75rem, env(safe-area-inset-right));
      z-index: 115;
    }

    .discussion-profile-button {
      width: 2.8rem;
      min-width: 2.8rem;
      height: 2.8rem;
      border-radius: 0.82rem;
      padding: 0.28rem;
      box-shadow: 0 14px 36px rgba(118, 54, 76, 0.2);
    }

    .discussion-profile-avatar {
      width: 2.15rem;
      height: 2.15rem;
    }

    .discussion-profile-chevron {
      position: absolute;
      right: 0.16rem;
      bottom: 0.12rem;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.86);
      font-size: 0.62rem;
      line-height: 1;
      padding: 0.03rem 0.12rem;
    }

    .discussion-profile-menu {
      position: fixed;
      top: calc(6.92rem + env(safe-area-inset-top));
      right: max(0.75rem, env(safe-area-inset-right));
      z-index: 116;
      width: min(86vw, 15.5rem);
      max-height: calc(100dvh - 7.75rem);
      overflow-y: auto;
      box-shadow: 0 20px 52px rgba(72, 34, 56, 0.24);
    }

    .discussion-announcement-panel {
      padding: 0.82rem;
    }

    .discussion-announcement-list {
      gap: 0.5rem;
      margin-top: 0.58rem;
    }

    .discussion-announcement-card {
      gap: 0.35rem;
      padding: 0.68rem 0.74rem;
    }

    .discussion-announcement-card .discussion-topic-meta {
      gap: 0.36rem;
    }

    .discussion-announcement-body {
      display: none;
    }

    .discussion-announcement-title {
      font-size: 0.94rem;
      line-height: 1.35;
    }

    .discussion-mobile-category-button {
      position: fixed;
      left: max(0.75rem, env(safe-area-inset-left));
      bottom: max(0.82rem, env(safe-area-inset-bottom));
      z-index: 91;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.32rem;
      min-width: 3.35rem;
      min-height: 2.65rem;
      border: 1px solid var(--sys-purple-line);
      border-radius: 999px;
      background: rgba(255, 250, 254, 0.94);
      color: var(--sys-ink);
      box-shadow: 0 16px 42px rgba(118, 54, 76, 0.2);
      font: inherit;
      font-size: 0.78rem;
      font-weight: 850;
      padding: 0.4rem 0.72rem;
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
    }

    .discussion-mobile-category-button svg,
    .discussion-mobile-category-button i {
      width: 1.05rem;
      height: 1.05rem;
    }

    .discussion-category-panel {
      position: fixed;
      left: max(0.75rem, env(safe-area-inset-left));
      bottom: calc(max(0.82rem, env(safe-area-inset-bottom)) + 3.35rem);
      z-index: 94;
      width: min(86vw, 21rem);
      max-height: min(62dvh, 25rem);
      overflow-y: auto;
      opacity: 0;
      pointer-events: none;
      transform: translateY(0.6rem) scale(0.98);
      transition: opacity 0.18s ease, transform 0.18s ease;
    }

    .discussion-category-panel.is-mobile-open {
      opacity: 1;
      pointer-events: auto;
      transform: translateY(0) scale(1);
    }

    #discussion-category-chips {
      display: grid;
      grid-template-columns: 1fr;
      overflow: visible;
      padding-bottom: 0;
    }

    #discussion-category-chips .discussion-category-chip {
      width: 100%;
      justify-content: flex-start;
    }

    .discussion-filter-panel {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 0.5rem;
      align-items: center;
    }

    .discussion-filter-field,
    .discussion-filter-field.is-search {
      grid-column: 1 / -1;
      width: 100%;
      min-width: 0;
      flex: 0 1 auto;
    }

    .discussion-view-toggle {
      width: 100%;
      justify-self: stretch;
      justify-content: center;
      overflow: visible;
    }

    #discussion-list-refresh {
      width: 100%;
      min-width: 0;
      justify-self: stretch;
    }

    .discussion-topic-card {
      width: 100%;
      max-width: 100%;
      min-width: 0;
      grid-template-columns: minmax(0, 1fr);
      gap: 0.62rem;
      padding-right: 2.6rem;
      overflow: hidden;
    }

    .discussion-topic-card::before {
      display: none;
    }

    .discussion-topic-card > .discussion-avatar {
      width: 2.8rem;
      height: 2.8rem;
    }

    .discussion-topic-card__solved-ribbon {
      top: 0.54rem;
      right: -2.45rem;
      min-width: 7rem;
      font-size: 0.64rem;
    }

    .discussion-solutions__header,
    .discussion-solutions__item summary {
      grid-template-columns: 1fr;
    }

    .discussion-solutions__header {
      display: grid;
    }

    .discussion-topic-main,
    .discussion-topic-title,
    .discussion-topic-excerpt,
    .discussion-topic-meta {
      min-width: 0;
      max-width: 100%;
      overflow-wrap: anywhere;
    }

    .discussion-topic-title {
      display: flex;
      width: 100%;
    }

    .discussion-topic-stats {
      min-width: 0;
      width: 100%;
      justify-content: flex-start;
      text-align: left;
      gap: 0.42rem 0.55rem;
    }

    .discussion-topic-stats span {
      min-width: 0;
    }

    body:has(.discussion-shell[data-discussion-mode="detail"]) {
      padding-bottom: 4.75rem;
    }

    .discussion-shell[data-discussion-mode="detail"] {
      padding-bottom: 5.25rem;
    }

    .discussion-mobile-tools {
      position: fixed;
      left: max(0.75rem, env(safe-area-inset-left));
      right: auto;
      bottom: max(0.82rem, env(safe-area-inset-bottom));
      top: auto;
      z-index: 92;
      width: auto;
      max-width: calc(100vw - 1.5rem);
      transform: none;
      justify-content: flex-start;
      gap: 0.4rem;
      padding: 0.38rem;
      border-radius: 999px;
    }

    .discussion-mobile-tools .discussion-tool-icon {
      width: 2.42rem;
      height: 2.42rem;
    }

    .discussion-profile-page {
      grid-template-columns: 3.4rem minmax(0, 1fr);
      gap: 0.6rem;
      align-items: start;
      overflow: hidden;
    }

    .discussion-profile-page::before {
      grid-column: 1 / -1;
    }

    .discussion-profile-sidebar {
      position: sticky;
      top: 4.15rem;
      width: 3.4rem;
      min-width: 3.4rem;
      max-width: 3.4rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.55rem;
      padding: 0.42rem 0.28rem;
      overflow: hidden;
      z-index: 3;
    }

    .discussion-profile-sidebar .discussion-profile-large-avatar,
    .discussion-profile-large-avatar {
      width: 2.25rem;
      height: 2.25rem;
      min-width: 2.25rem;
      border-radius: 0.65rem;
      margin: 0 auto;
    }

    .discussion-profile-nav {
      width: 100%;
      display: grid;
      justify-items: center;
      gap: 0.42rem;
    }

    .discussion-profile-nav a {
      width: 2.35rem;
      height: 2.35rem;
      min-width: 2.35rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0;
      overflow: hidden;
    }

    .discussion-profile-nav a svg,
    .discussion-profile-nav a i {
      width: 1rem;
      height: 1rem;
      flex: 0 0 auto;
    }

    .discussion-profile-nav-label {
      position: absolute;
      width: 1px;
      height: 1px;
      overflow: hidden;
      clip: rect(0 0 0 0);
      white-space: nowrap;
    }

    .discussion-profile-main {
      min-width: 0;
      overflow: hidden;
    }

    .discussion-profile-identity,
    .discussion-profile-stats,
    .discussion-profile-section {
      min-width: 0;
      max-width: 100%;
      margin-left: 0;
    }

    .discussion-profile-main {
      gap: 0.72rem;
    }

    .discussion-profile-identity {
      padding: 0.82rem;
    }

    .discussion-profile-identity h2 {
      font-size: 1.28rem;
    }

    .discussion-profile-stats {
      grid-template-columns: 1fr;
      gap: 0.58rem;
    }

    .discussion-profile-stat {
      min-height: 4.35rem;
      padding: 0.72rem;
    }

    .discussion-profile-section {
      padding: 0.78rem;
    }

    .discussion-profile-nav a {
      box-sizing: border-box;
      width: 2.35rem !important;
      max-width: 2.35rem !important;
      min-width: 2.35rem !important;
      height: 2.35rem !important;
      max-height: 2.35rem;
      display: flex !important;
      align-items: center;
      justify-content: center;
      gap: 0 !important;
      padding: 0 !important;
      font-size: 0 !important;
      line-height: 1 !important;
      overflow: hidden;
    }

    .discussion-profile-nav a.active,
    .discussion-profile-nav a:hover {
      width: 2.35rem !important;
      max-width: 2.35rem !important;
      background: rgba(232, 120, 154, 0.2);
    }

    .discussion-profile-nav-label {
      display: none !important;
    }

    .discussion-profile-nav a svg,
    .discussion-profile-nav a i {
      width: 1.05rem !important;
      height: 1.05rem !important;
      margin: 0 !important;
      font-size: 1.05rem !important;
    }

    .discussion-profile-nav a i[data-lucide] {
      display: block;
      overflow: hidden;
      text-indent: -999px;
    }

    .discussion-profile-nav a i[data-lucide] svg {
      text-indent: 0;
    }

    .discussion-profile-nav {
      justify-items: start;
      padding-left: 0.18rem;
    }

    .discussion-profile-nav a {
      transform: translateX(-1.25rem);
    }

    .discussion-profile-nav a.active,
    .discussion-profile-nav a:hover {
      transform: translateX(-1.25rem);
    }

    .discussion-list-side {
      width: 100%;
      min-width: 0;
      align-self: stretch;
    }

    .discussion-announcement-panel {
      width: 100%;
      min-height: 12rem;
    }

    .discussion-announcement-list {
      width: 100%;
      min-height: 8.5rem;
    }

    .discussion-announcement-card,
    .discussion-announcement-skeleton {
      width: 100%;
    }

    .discussion-list {
      min-height: 20rem;
    }

    #discussion-list {
      min-height: 22rem;
    }

    #discussion-list:empty {
      min-height: 22rem;
    }

    .discussion-topic-skeleton {
      width: 100% !important;
    }

    .discussion-panel {
      width: 100%;
      min-width: 0;
    }

    .discussion-list > .discussion-topic-skeleton,
    .discussion-list > .discussion-reply-skeleton {
      width: 100% !important;
      max-width: 100%;
    }
  }

  @media (min-width: 1081px) {
    .discussion-detail-main #discussion-detail-author {
      display: none;
    }
  }