/* 导游学霸 · 移动端系统收口层
   本文件始终最后加载，用于结束多份历史 CSS 之间的级联竞争。 */

@media (max-width: 768px) {
  :root {
    --mobile-gutter: clamp(14px, 4vw, 20px);
    --mobile-header: 64px;
    --mobile-tap: 44px;
    --mobile-icon: 24px;
  }

  html {
    width: 100%;
    min-width: 320px;
    overflow-x: clip;
    scroll-padding-top: calc(var(--mobile-header) + env(safe-area-inset-top, 0px) + 10px);
  }

  body {
    width: 100%;
    min-width: 320px;
    min-height: 100dvh;
    overflow-x: clip;
    overscroll-behavior-x: none;
  }

  #view,
  main,
  main.map-full {
    width: 100%;
    min-width: 0;
    max-width: 100%;
  }

  button,
  a,
  [role="button"] {
    -webkit-tap-highlight-color: transparent;
  }

  button:active,
  [role="button"]:active {
    transition-duration: .08s !important;
  }

  button > svg,
  .btn > svg,
  [role="button"] > svg {
    width: var(--mobile-icon);
    height: var(--mobile-icon);
    flex: 0 0 var(--mobile-icon);
  }

  /* App chrome: one 64px bar, with four non-overlapping touch zones. */
  .workspace-bar {
    left: 0 !important;
    right: 0;
    top: 0;
    height: calc(var(--mobile-header) + env(safe-area-inset-top, 0px)) !important;
    min-width: 0;
    padding: env(safe-area-inset-top, 0px) 10px 0 72px !important;
    gap: 8px;
    z-index: 150;
  }

  .workspace-bar > div:first-child {
    flex: 1 1 auto;
    min-width: 0;
    margin-right: auto;
  }

  .workspace-bar > div:first-child > span,
  .workspace-bar > p {
    display: none !important;
  }

  .workspace-bar > div:first-child > b {
    display: block;
    min-width: 0;
    overflow: hidden;
    font-size: 14px;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .mobile-menu-btn {
    display: grid !important;
    grid-template-rows: repeat(3, 2px);
    place-content: center;
    gap: 5px !important;
    top: calc(9px + env(safe-area-inset-top, 0px));
    left: max(10px, env(safe-area-inset-left, 0px));
    width: 46px;
    height: 46px;
    min-width: 46px;
    min-height: 46px;
    padding: 0 !important;
    border: 1px solid color-mix(in srgb, currentColor 12%, transparent);
  }

  .mobile-menu-btn span {
    display: block !important;
    width: 20px !important;
    height: 2px !important;
    margin: 0 !important;
    border-radius: 999px;
    background: currentColor;
  }

  .account-entry {
    flex: 0 0 auto;
    min-width: 0;
    margin-left: 0 !important;
  }

  .account-login-btn,
  .account-user-btn {
    min-height: var(--mobile-tap) !important;
    padding-inline: 10px !important;
    white-space: nowrap;
  }

  .sidebar,
  .sidebar:not(.expanded) {
    width: min(88vw, 320px) !important;
    padding-top: env(safe-area-inset-top, 0px);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    transform: translateX(-110%) !important;
    pointer-events: none;
    box-shadow: 24px 0 70px rgba(0, 0, 0, .24);
  }

  .sidebar.mobile-open,
  .sidebar:not(.expanded).mobile-open {
    transform: translateX(0) !important;
    pointer-events: auto;
  }

  .sb-nav-item {
    min-height: 48px;
  }

  .mobile-sidebar-backdrop {
    inset: 0;
    min-width: 0;
    min-height: 0;
  }

  /* Inputs stay readable when iOS opens the software keyboard. */
  input,
  textarea,
  select {
    max-width: 100%;
    font-size: 16px !important;
  }

  .auth-overlay {
    align-items: end;
    padding: max(12px, env(safe-area-inset-top, 0px)) 10px max(10px, env(safe-area-inset-bottom, 0px));
  }

  .auth-card {
    width: 100%;
    max-height: calc(100dvh - env(safe-area-inset-top, 0px) - 20px) !important;
    padding: 26px 20px 22px;
    border-radius: 22px 22px 14px 14px;
    overscroll-behavior: contain;
  }

  .auth-card input,
  .auth-card form button {
    min-height: 48px;
  }

  /* A route change must never be covered by a conversion banner. */
  .auth-nudge {
    display: none !important;
  }

  /* Course workspace: every subject is visible; chapters remain an explicit snap rail. */
  .course-workspace {
    width: 100%;
    padding: 14px var(--mobile-gutter) 40px;
  }

  .course-topline {
    min-width: 0;
    padding: 12px !important;
  }

  .course-topline > div {
    min-width: 0;
  }

  .course-topline > div b {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .course-subject-switcher {
    display: grid !important;
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    gap: 8px !important;
    overflow: visible !important;
  }

  .course-subject-switcher button {
    min-width: 0 !important;
    min-height: 72px;
    grid-template-columns: 30px minmax(0, 1fr) !important;
    grid-template-rows: auto auto;
    gap: 2px 8px;
    padding: 10px !important;
  }

  .course-subject-switcher i {
    grid-row: 1 / 3;
    width: 30px !important;
    height: 30px !important;
  }

  .course-subject-switcher span,
  .course-subject-switcher b {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .course-subject-switcher em {
    display: none;
  }

  .course-shell > .chapter-rail {
    overflow: hidden;
  }

  .course-stage {
    min-height: 0 !important;
    background: #f6fbfe !important;
  }

  .course-shell > .chapter-rail .chapter-rail-list {
    display: flex !important;
    gap: 8px;
    overflow-x: auto !important;
    padding: 10px 12px 14px;
    scroll-padding-inline: 12px;
    scroll-snap-type: x proximity;
    scrollbar-width: thin;
  }

  .course-shell > .chapter-rail .chapter-rail-list button {
    flex: 0 0 min(74vw, 280px);
    min-width: 0;
    min-height: 58px;
    scroll-snap-align: start;
  }

  .course-subject-intro {
    min-height: 0 !important;
    padding: 46px 24px 50px !important;
  }

  .course-subject-intro h1 {
    max-width: 100%;
    font-size: clamp(38px, 12vw, 52px) !important;
    line-height: 1.12;
  }

  .course-subject-intro > p {
    font-size: 16px !important;
  }

  .subject-intro-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    width: 100%;
    margin: 28px 0;
  }

  .subject-intro-stats div {
    min-width: 0;
    padding: 14px 10px;
  }

  .subject-intro-stats b {
    font-size: clamp(20px, 7vw, 26px);
  }

  .subject-intro-action {
    width: 100%;
    padding: 18px;
  }

  /* Quiz hub and progress dashboard use one density and one icon scale. */
  .quiz-page,
  .profile-page {
    width: 100%;
    max-width: 100%;
    padding-inline: var(--mobile-gutter) !important;
  }

  .quiz-entry-section > header > span,
  .qs-code,
  .subject-progress-list button > i {
    display: grid;
    place-items: center;
    width: 40px !important;
    height: 40px !important;
    min-width: 40px;
    min-height: 40px;
    font-size: 11px !important;
    line-height: 1;
  }

  .quiz-entry-section > header.no-num {
    display: block !important;
  }

  .quiz-entry-section > header.no-num > div {
    width: 100%;
    min-width: 0;
  }

  .quiz-entry-section > header.no-num b {
    display: block;
    font-size: 18px;
  }

  .quiz-entry-section > header.no-num p {
    margin-top: 4px;
    font-size: 13px;
  }

  .quiz-version-bar > header {
    grid-template-columns: 72px minmax(0, 1fr) !important;
    gap: 12px !important;
  }

  .quiz-version-bar > header > .qv-tag {
    width: 72px !important;
    min-width: 72px;
    padding-inline: 6px;
    font-size: 10px !important;
    white-space: nowrap;
  }

  .quiz-version-bar > header > div {
    min-width: 0;
  }

  .quiz-subjects,
  .progress-kpis,
  .me-dashboard-grid {
    min-width: 0;
  }

  .qs-item {
    width: 100%;
    min-width: 0;
    min-height: 92px;
  }

  .management-panel {
    min-width: 0;
  }

  .management-panel > header span,
  .management-panel > header small,
  .progress-kpis article > span,
  .progress-kpis article > small,
  .subject-progress-list span,
  .week-chart span,
  .debt-list small,
  .activity-panel > p,
  .data-control-panel span {
    font-size: 11px;
    line-height: 1.5;
  }

  .panel-action,
  .data-control-panel .btn,
  .map-type-switch button,
  .map-base-options button,
  .map-traffic-toggle,
  .ln-tab {
    min-height: var(--mobile-tap) !important;
  }

  .data-control-panel .flex {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  /* Long landing/dashboard pages only lay out near-viewport sections. */
  .landing-page > section:not(:first-child),
  .profile-page > section,
  .profile-page > .management-panel {
    content-visibility: auto;
    contain-intrinsic-size: 600px;
  }

  /* Maps fill the dynamic viewport and controls remain thumb-sized. */
  body[data-view="map"] main,
  body[data-view="map"] #view,
  body[data-view="map"] .homemap-canvas {
    min-height: 100dvh;
  }

  body[data-view="map"] :is(.map-type-switch, .map-layer-switch, .map-base-options) button,
  body[data-view="map"] .map-traffic-toggle {
    min-height: var(--mobile-tap) !important;
  }
}

@media (max-width: 370px) {
  .workspace-bar {
    gap: 5px;
    padding-right: 7px !important;
  }

  .workspace-bar > div:first-child > b {
    font-size: 13px;
  }

  .account-login-btn,
  .account-user-btn {
    padding-inline: 8px !important;
    font-size: 10px !important;
  }
}

@media (max-width: 768px) and (orientation: landscape) and (max-height: 480px) {
  :root { --mobile-header: 56px; }

  .workspace-bar {
    padding-left: 66px !important;
  }

  .mobile-menu-btn {
    top: calc(5px + env(safe-area-inset-top, 0px));
  }

  .auth-card {
    max-width: 620px;
    border-radius: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto !important; }
}