:root {
  --bg-1: #f9fafc;
  --bg-2: #edf1f5;
  --panel: rgba(255, 255, 255, 0.98);
  --text: #102845;
  --muted: #54667f;
  --line: rgba(16, 27, 52, 0.14);
  --accent: #df4f41;
  --accent-2: #1f7fd0;
  --good: #21944d;
  --bad: #c33d38;
  --shadow: 0 14px 32px rgba(23, 61, 110, 0.14);
  --radius: 14px;
  --font: "BIZ UDPGothic", "Yu Gothic UI", "Meiryo", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(circle at 8% 10%, rgba(255, 255, 255, 0.88), transparent 34%),
    radial-gradient(circle at 94% 4%, rgba(186, 200, 214, 0.22), transparent 28%),
    linear-gradient(140deg, var(--bg-1), var(--bg-2));
}

.shell {
  width: min(1240px, calc(100% - 1.4rem));
  margin: 0.9rem auto 1.25rem;
  display: grid;
  gap: 0.75rem;
}

.shell.admin-desktop-wide {
  width: min(1840px, calc(100% - 1.4rem));
}

.shell.admin-desktop-wide #adminListCard .table-wrap {
  max-height: 72vh;
}

.topbar,
.card,
.top-nav {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.8rem;
  padding: 0.9rem 1rem;
}

.top-nav {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.35rem;
  padding: 0.4rem;
}

.top-nav.has-admin {
  grid-template-columns: repeat(5, 1fr);
}

.eyebrow {
  margin: 0;
  font-size: 0.79rem;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--accent-2);
}

h1,
h2,
h3 {
  margin: 0;
}

h1 {
  margin-top: 0.3rem;
  font-size: clamp(1.15rem, 3vw, 1.8rem);
}

.header-actions {
  display: grid;
  justify-items: end;
  gap: 0.4rem;
}

.auth-badge {
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  border: 1px solid #c8d8f2;
  background: #edf5ff;
  color: #1d4f8f;
  font-size: 0.82rem;
  font-weight: 700;
  white-space: nowrap;
}

.toast {
  margin: 0;
  min-height: 1.1rem;
  color: #2b4e74;
  font-size: 0.9rem;
  padding-inline: 0.25rem;
}

.view-stage {
  position: relative;
  min-height: calc(100vh - 190px);
}

.view {
  display: none;
  gap: 0.65rem;
  animation: viewOut 0.18s ease;
}

.view.is-active {
  display: grid;
  animation: viewIn 0.24s ease;
}

@keyframes viewIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes viewOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

.card {
  padding: 1rem 1.06rem;
  display: grid;
  gap: 0.7rem;
}

.settings-layout {
  display: grid;
  grid-template-columns: minmax(220px, 260px) minmax(0, 1fr);
  gap: 0.65rem;
  align-items: start;
}

.settings-sidebar {
  position: sticky;
  top: 0.65rem;
  align-self: start;
}

.settings-nav {
  display: grid;
  gap: 0.38rem;
}

.settings-nav-btn {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f7fbff;
  color: #153055;
  padding: 0.58rem 0.84rem;
  width: 100%;
  text-align: left;
}

.settings-nav-btn.active {
  border-color: #1f7fd0;
  background: #1f7fd0;
  color: #fff;
}

.settings-content {
  display: grid;
  gap: 0.65rem;
  min-width: 0;
}

.settings-pane {
  display: none;
}

.settings-pane.is-active {
  display: grid;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.muted {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: 0.55rem;
}

.home-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0.85rem;
  text-align: left;
  color: #132749;
  display: grid;
  gap: 0.3rem;
}

.home-card span {
  color: var(--muted);
  font-size: 0.9rem;
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(110px, 1fr));
  gap: 0.5rem;
}

.mode-card {
  border: 1px solid var(--line);
  border-radius: 11px;
  background: #fff;
  color: #143156;
  padding: 0.9rem;
  display: grid;
  gap: 0.38rem;
  text-align: left;
  min-height: 88px;
}

.mode-card strong {
  font-size: clamp(1rem, 2.2vw, 1.1rem);
  color: #143156;
}

.mode-card.active {
  border-color: #1f7fd0;
  background: #edf5ff;
  color: #0f2e57;
}

.mode-count {
  color: #26538b;
  font-size: 0.95rem;
}

.quiz-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.quiz-progress strong {
  font-size: clamp(1rem, 2.4vw, 1.14rem);
}

#quizQuestionText {
  font-size: clamp(1.16rem, 2.8vw, 1.52rem);
  line-height: 1.5;
}

.chip {
  border-radius: 999px;
  border: 1px solid #cbdaf2;
  background: #eef5ff;
  color: #1e4f90;
  padding: 0.22rem 0.62rem;
  font-size: 0.84rem;
  font-weight: 700;
}

.choices {
  display: grid;
  gap: 0.55rem;
}

.choice-button {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: #152745;
  padding: 0.92rem 1rem;
  text-align: left;
  font-weight: 700;
  font-size: clamp(1rem, 2.4vw, 1.14rem);
  line-height: 1.45;
  min-height: 58px;
}

.choice-button strong {
  display: inline-block;
  min-width: 1.6rem;
  margin-right: 0.18rem;
}

.choice-button.selected {
  border-color: #2d82d3;
  background: #edf5ff;
}

.choice-button.correct {
  border-color: var(--good);
  background: #ebfaef;
}

.choice-button.wrong {
  border-color: var(--bad);
  background: #fff1f0;
}

.review-list {
  display: grid;
  gap: 0.42rem;
}

.review-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 0.58rem;
  line-height: 1.45;
}

.review-item.correct {
  border-left: 5px solid var(--good);
}

.review-item.wrong {
  border-left: 5px solid var(--bad);
}

.thread-list,
.post-list {
  display: grid;
  gap: 0.35rem;
}

.thread-item,
.post-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 0.46rem 0.52rem;
}

.thread-head,
.post-head {
  display: flex;
  align-items: center;
  gap: 0.46rem;
}

.thread-head-main {
  min-width: 0;
  display: grid;
  gap: 0.15rem;
}

.avatar-badge {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--line);
  object-fit: cover;
  flex: 0 0 auto;
  background: #fff;
}

.thread-avatar {
  width: 30px;
  height: 30px;
}

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

.avatar-fallback {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #eef4ff;
  color: #1a4f8a;
  font-weight: 700;
  font-size: 0.85rem;
}

.thread-item {
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.thread-item:hover {
  background: #f5faff;
  border-color: #9fc2ea;
  transform: translateY(-1px);
}

.thread-title {
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.35;
}

.thread-meta,
.post-meta {
  color: var(--muted);
  font-size: 0.78rem;
}

.thread-preview {
  margin-top: 0.2rem;
  font-size: 0.83rem;
  color: #273f5e;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
}

.thread-actions,
.post-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 0.35rem;
  gap: 0.35rem;
}

.like-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  border-radius: 999px;
  padding: 0.34rem 0.66rem;
  font-size: 0.84rem;
}

.like-btn .like-count {
  min-width: 1.1rem;
  text-align: right;
}

.share-btn .share-count {
  min-width: 1.1rem;
  text-align: right;
}

.like-btn.liked {
  border-color: #3f86cf;
  background: #eaf3ff;
  color: #14509a;
}

.share-btn.shared {
  border-color: #3d9e75;
  background: #e8f8ef;
  color: #1f7a52;
}

.thread-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.32rem;
  margin-top: 0.36rem;
}

.tag-chip {
  border: 1px solid #bdd4f0;
  border-radius: 999px;
  background: #f1f7ff;
  color: #1a4f8a;
  padding: 0.22rem 0.58rem;
  font-size: 0.8rem;
}

.thread-hashtags-wrap {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fbff;
  padding: 0.58rem;
  display: grid;
  gap: 0.45rem;
}

.thread-tag-item {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.thread-tag-chip {
  cursor: pointer;
}

.thread-tag-edit-btn,
.thread-tag-delete-btn {
  padding: 0.28rem 0.5rem;
  font-size: 0.76rem;
}

.board-feed-tabs {
  display: flex;
  gap: 0.38rem;
  flex-wrap: wrap;
}

.board-subtabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.38rem;
}

.board-subtab {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #f7fbff;
  color: #153055;
  padding: 0.42rem 0.82rem;
}

.board-subtab.active {
  border-color: #1f7fd0;
  background: #1f7fd0;
  color: #fff;
}

.board-subtab-pane {
  display: grid;
  gap: 0.5rem;
}

.board-search-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(180px, 1fr));
  gap: 0.52rem;
}

.board-search-col {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 0.5rem;
  display: grid;
  gap: 0.42rem;
}

.board-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.36rem;
  min-height: 1.5rem;
}

.board-chip {
  border: 1px solid #bfd4ef;
  border-radius: 999px;
  background: #f2f8ff;
  color: #173e6a;
  padding: 0.3rem 0.64rem;
  font-size: 0.84rem;
}

.board-chip .muted {
  margin-left: 0.25rem;
  font-size: 0.75rem;
}

.notification-list {
  display: grid;
  gap: 0.42rem;
}

.notification-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 0.5rem;
  display: grid;
  gap: 0.3rem;
}

.notification-item.unread {
  border-left: 4px solid #2a82d4;
  background: #f3f8ff;
}

.notification-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
}

.notification-title {
  font-weight: 700;
  font-size: 0.92rem;
}

.notification-meta {
  color: var(--muted);
  font-size: 0.78rem;
}

.dm-layout {
  display: grid;
  grid-template-columns: minmax(230px, 0.95fr) minmax(0, 1.45fr);
  gap: 0.58rem;
}

.dm-conversation-pane,
.dm-message-pane {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0.54rem;
  display: grid;
  gap: 0.48rem;
}

.dm-conversation-list {
  display: grid;
  gap: 0.35rem;
  max-height: 420px;
  overflow: auto;
}

.dm-conversation-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: #163153;
  text-align: left;
  padding: 0.5rem;
  display: grid;
  gap: 0.2rem;
}

.dm-conversation-item:hover {
  background: #f5faff;
}

.dm-conversation-item.active {
  border-color: #2d82d3;
  background: #edf6ff;
}

.dm-conversation-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.35rem;
}

.dm-conversation-preview {
  color: var(--muted);
  font-size: 0.82rem;
}

.dm-message-list {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fbff;
  min-height: 210px;
  max-height: 460px;
  overflow: auto;
  padding: 0.46rem;
  display: grid;
  gap: 0.34rem;
}

.dm-message-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 0.42rem;
  display: grid;
  gap: 0.2rem;
}

.dm-message-item.mine {
  border-color: #9ec6eb;
  background: #eef6ff;
}

.dm-message-meta {
  color: var(--muted);
  font-size: 0.76rem;
}

.username-button {
  border: 0;
  background: transparent;
  color: #1a4f8a;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

.mention-inline-btn {
  padding: 0.18rem 0.46rem;
  font-size: 0.74rem;
  margin-left: 0.35rem;
}

.feed-tab {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #f6f9ff;
  color: #153055;
  padding: 0.42rem 0.82rem;
}

.feed-tab.active {
  background: #1f7fd0;
  color: #fff;
  border-color: #1f7fd0;
}

.follow-user-list {
  display: grid;
  gap: 0.38rem;
}

.follow-user-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 0.44rem 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.45rem;
}

.follow-user-main {
  display: flex;
  align-items: center;
  gap: 0.42rem;
  min-width: 0;
}

.follow-user-text {
  display: grid;
  gap: 0.12rem;
  min-width: 0;
}

.follow-user-text strong {
  font-size: 0.9rem;
  line-height: 1.2;
}

.follow-avatar {
  width: 30px;
  height: 30px;
}

.post-body {
  margin-top: 0.28rem;
  white-space: pre-wrap;
}

.profile-avatar-preview-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.profile-avatar-preview {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--line);
  object-fit: cover;
  background: #fff;
}

.profile-image-editors {
  display: grid;
  gap: 0.6rem;
}

.profile-image-editor {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0.62rem;
  display: grid;
  gap: 0.5rem;
}

.profile-banner-preview-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 6 / 1;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(145deg, #edf4ff, #f8fbff);
  overflow: hidden;
  display: grid;
  place-items: center;
}

.profile-banner-preview {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile-view-card {
  gap: 0.75rem;
}

.profile-view-banner-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 6 / 1;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: linear-gradient(145deg, #edf4ff, #f8fbff);
}

.profile-view-banner-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile-view-banner-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #56739a;
  font-weight: 700;
  font-size: 0.95rem;
}

.profile-view-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.7rem;
}

.profile-view-avatar-wrap {
  position: relative;
  flex: 0 0 auto;
}

.profile-view-avatar-slot {
  flex: 0 0 auto;
  margin-top: -30px;
  margin-left: 0.2rem;
}

.profile-view-avatar-slot .avatar-badge {
  width: 94px;
  height: 94px;
  border-width: 2px;
  background: #fff;
}

.profile-view-title-wrap {
  min-width: 0;
  flex: 1 1 auto;
  display: grid;
  gap: 0.2rem;
}

.profile-view-name-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

#profileViewName {
  font-size: clamp(1.2rem, 2.4vw, 1.45rem);
}

#profileViewHandle {
  font-size: 0.9rem;
}

.profile-banner-size-note {
  font-size: 0.8rem;
}

.profile-edit-icon {
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid #b9cce8;
  background: rgba(255, 255, 255, 0.96);
  color: #1c4f8e;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.92rem;
  line-height: 1;
}

.profile-view-banner-wrap .profile-edit-icon {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  z-index: 2;
}

.profile-view-avatar-wrap .profile-edit-icon {
  position: absolute;
  right: -6px;
  bottom: 4px;
}

.thread-page-card {
  gap: 0.8rem;
}

.thread-page-posts {
  gap: 0.5rem;
}

.inline-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.inline-actions.compact {
  gap: 0.35rem;
}

.inline-actions.wrap {
  flex-wrap: wrap;
}

.stack-form {
  display: grid;
  gap: 0.55rem;
}

.top-gap {
  margin-top: 0.45rem;
}

label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.92rem;
  font-weight: 700;
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  padding: 0.55rem 0.84rem;
  font-weight: 700;
  cursor: pointer;
}

#startQuizButton,
#nextQuestionButton,
#cancelQuizButton,
#retryQuizButton,
#backToModeButton {
  padding: 0.74rem 1.02rem;
  font-size: 1rem;
}

button.ghost {
  border: 1px solid var(--line);
  background: #eef2f8;
  color: #142843;
}

button.danger {
  background: #c33d38;
  color: #fff;
}

button.danger:hover {
  background: #ad312d;
}

button:disabled {
  opacity: 0.58;
  cursor: not-allowed;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: #10213d;
  padding: 0.56rem 0.68rem;
}

.hidden {
  display: none !important;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 0.8rem;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  border: 0;
  background: rgba(27, 44, 66, 0.34);
}

.modal-card {
  position: relative;
  width: min(860px, calc(100vw - 1.2rem));
  max-height: calc(100vh - 1.2rem);
  overflow: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 0.88rem 0.95rem;
  display: grid;
  gap: 0.58rem;
}

.crop-modal-card {
  width: min(980px, calc(100vw - 1rem));
}

.crop-canvas-wrap {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f6f9ff;
  overflow: hidden;
}

#imageCropCanvas {
  width: 100%;
  height: auto;
  display: block;
  touch-action: none;
  cursor: grab;
}

#imageCropCanvas.dragging {
  cursor: grabbing;
}

.stats-layout {
  display: grid;
  gap: 0.6rem;
}

.stats-layout.with-ranking {
  grid-template-columns: minmax(0, 1.45fr) minmax(260px, 1fr);
  align-items: start;
}

.stats-layout.no-ranking {
  grid-template-columns: 1fr;
}

.stats-main {
  min-width: 0;
  display: grid;
  gap: 0.5rem;
}

.stats-side {
  min-width: 0;
}

.stats-side-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0.58rem;
  display: grid;
  gap: 0.48rem;
}

.stats-side-card h3 {
  margin: 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 0.45rem;
}

.stat-box {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 0.48rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--muted);
}

.stat-value {
  margin-top: 0.25rem;
  font-weight: 700;
}

.top-list {
  display: grid;
  gap: 0.35rem;
}

.top-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 0.5rem;
  display: flex;
  justify-content: space-between;
}

.ad-box {
  border: 1px dashed #84a4d4;
  border-radius: 10px;
  background: #eef5ff;
  padding: 0.72rem;
}


.table-wrap {
  overflow: auto;
  max-height: 520px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 1480px;
}

th,
td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  padding: 0.42rem;
}

th {
  position: sticky;
  top: 0;
  background: #f6f9ff;
  z-index: 2;
}

.admin-editable {
  cursor: text;
}

.admin-editable:hover {
  background: #f4f9ff;
}

.admin-editing {
  padding: 0.15rem !important;
  background: #fff8df;
}

.admin-cell-input {
  width: 100%;
  min-width: 130px;
  border: 1px solid #c9d6e8;
  border-radius: 8px;
  padding: 0.38rem 0.45rem;
  background: #fff;
  color: #10213d;
}

.admin-choice-cell {
  cursor: grab;
}

.admin-choice-cell:active {
  cursor: grabbing;
}

.admin-choice-drag-source {
  opacity: 0.62;
}

.admin-choice-drag-over {
  outline: 2px dashed #2d82d3;
  outline-offset: -2px;
  background: #edf6ff !important;
}

.admin-row-action {
  white-space: nowrap;
  padding: 0.38rem 0.56rem;
  font-size: 0.84rem;
}

.admin-mode-checks {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fbff;
  padding: 0.55rem;
  display: grid;
  gap: 0.32rem;
}

.admin-mode-checks legend {
  font-weight: 700;
  color: #193a64;
  padding-inline: 0.2rem;
}

.admin-question-layout {
  display: grid;
  grid-template-columns: minmax(200px, 250px) minmax(0, 1fr);
  gap: 0.58rem;
  align-items: start;
}

.admin-question-sidebar {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0.56rem;
  display: grid;
  gap: 0.48rem;
  position: sticky;
  top: 0.64rem;
}

.admin-mode-filter-list {
  display: grid;
  gap: 0.32rem;
}

.admin-mode-filter-btn {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f7fbff;
  color: #153055;
  padding: 0.46rem 0.62rem;
  text-align: left;
}

.admin-mode-filter-btn.active {
  border-color: #1f7fd0;
  background: #1f7fd0;
  color: #fff;
}

.admin-mode-stats {
  display: grid;
  gap: 0.3rem;
}

.admin-mode-stat-item {
  display: flex;
  justify-content: space-between;
  gap: 0.4rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fbff;
  padding: 0.38rem 0.5rem;
  font-size: 0.84rem;
}

.admin-question-table-wrap {
  min-width: 0;
}

.admin-question-table-wrap table {
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.admin-question-table-wrap th,
.admin-question-table-wrap td {
  border-right: 1px solid var(--line);
}

.admin-question-table-wrap th:last-child,
.admin-question-table-wrap td:last-child {
  border-right: none;
}

.admin-question-table-wrap th:nth-child(1),
.admin-question-table-wrap td:nth-child(1),
.admin-question-table-wrap th:nth-child(3),
.admin-question-table-wrap td:nth-child(3),
.admin-question-table-wrap th:nth-child(7),
.admin-question-table-wrap td:nth-child(7),
.admin-question-table-wrap th:nth-child(12),
.admin-question-table-wrap td:nth-child(12),
.admin-question-table-wrap th:nth-child(13),
.admin-question-table-wrap td:nth-child(13) {
  border-right-width: 2px;
  border-right-color: #c3d4ec;
}

.admin-question-table-wrap tbody tr:nth-child(even) td {
  background: #fcfdff;
}

.admin-question-table-wrap tbody tr:hover td {
  background: #f3f8ff;
}

.admin-mode-head {
  text-align: center;
}

.admin-mode-cell {
  text-align: center;
}

.admin-mode-toggle {
  width: 1rem;
  height: 1rem;
  accent-color: #1f7fd0;
}

.admin-tabs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.45rem;
}

.admin-tab {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f7fbff;
  color: #153055;
  padding: 0.58rem 0.84rem;
  width: 100%;
  text-align: left;
}

.admin-tab.active {
  background: #1f7fd0;
  color: #fff;
  border-color: #1f7fd0;
}

.admin-user-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(0, 1.6fr);
  gap: 0.6rem;
}

.admin-workspace {
  display: grid;
  grid-template-columns: minmax(200px, 250px) minmax(0, 1fr);
  gap: 0.65rem;
  align-items: start;
}

.admin-content-stack {
  display: grid;
  gap: 0.65rem;
  min-width: 0;
}

#adminTabsCard {
  position: sticky;
  top: 0.65rem;
  align-self: start;
}

.admin-dm-layout {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(0, 1.7fr);
  gap: 0.6rem;
}

.admin-dm-list-wrap,
.admin-dm-detail {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0.55rem;
}

.admin-dm-thread-list {
  display: grid;
  gap: 0.4rem;
  max-height: 620px;
  overflow: auto;
}

.admin-dm-thread-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: #153154;
  text-align: left;
  display: grid;
  gap: 0.24rem;
  padding: 0.5rem 0.56rem;
}

.admin-dm-thread-item:hover {
  background: #f4f9ff;
}

.admin-dm-thread-item.active {
  border-color: #2a83d6;
  background: #ebf4ff;
}

.admin-dm-messages {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  overflow: auto;
  max-height: 460px;
  display: grid;
  gap: 0.34rem;
  padding: 0.46rem;
}

.admin-dm-message-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fbff;
  padding: 0.4rem;
  display: grid;
  gap: 0.16rem;
}

.admin-user-list-wrap,
.admin-user-detail {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0.55rem;
}

.admin-user-list {
  display: grid;
  gap: 0.42rem;
  max-height: 620px;
  overflow: auto;
}

.admin-user-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: #173154;
  text-align: left;
  display: grid;
  gap: 0.25rem;
  padding: 0.5rem 0.58rem;
}

.admin-user-item:hover {
  background: #f4f9ff;
}

.admin-user-item.active {
  border-color: #2a83d6;
  background: #ebf4ff;
}

.admin-user-item-head {
  display: flex;
  justify-content: space-between;
  gap: 0.4rem;
  align-items: center;
}

.admin-user-item-meta {
  font-size: 0.8rem;
  color: var(--muted);
}

.check-row {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-weight: 600;
}

.check-row input {
  width: auto;
  margin-top: 0.2rem;
}

.admin-user-meta {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fbff;
  padding: 0.52rem;
}

.admin-user-meta-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(140px, 1fr));
  gap: 0.45rem;
}

.admin-user-meta-grid div {
  display: grid;
  gap: 0.2rem;
}

.admin-user-meta-grid strong {
  word-break: break-all;
}

.admin-user-profile-actions {
  margin-top: 0.25rem;
}

.admin-analytics {
  display: grid;
  gap: 0.5rem;
}

.admin-ranking-item {
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.admin-ranking-item span {
  font-size: 0.83rem;
  color: #233d60;
}

.admin-access-table {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  overflow: auto;
  max-height: 360px;
}

.admin-access-row {
  display: grid;
  grid-template-columns: 140px 74px minmax(220px, 1fr) 110px 120px;
  gap: 0.38rem;
  padding: 0.38rem 0.46rem;
  border-bottom: 1px solid rgba(16, 27, 52, 0.08);
  font-size: 0.82rem;
  align-items: center;
}

.admin-access-path {
  display: grid;
  gap: 0.12rem;
}

.admin-access-path strong {
  font-size: 0.82rem;
  line-height: 1.25;
}

.admin-access-path small {
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.2;
}

.admin-access-head {
  position: sticky;
  top: 0;
  background: #f6f9ff;
  z-index: 1;
  font-weight: 700;
}

.nav-btn {
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  color: #18304f;
  padding: 0.58rem 0.45rem;
  font-size: 0.94rem;
  min-height: 42px;
}

.nav-btn.active {
  background: linear-gradient(140deg, #1f7fd0, #1f5cc5);
  color: #fff;
  border-color: transparent;
}

@media (max-width: 1200px) {
  .shell {
    width: min(1120px, calc(100% - 0.9rem));
  }

  .card {
    padding: 0.9rem 0.92rem;
  }

  .top-nav {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .top-nav.has-admin {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .home-grid {
    grid-template-columns: repeat(2, minmax(160px, 1fr));
  }

  .mode-grid {
    grid-template-columns: repeat(3, minmax(110px, 1fr));
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(120px, 1fr));
  }

  .stats-layout.with-ranking {
    grid-template-columns: 1fr;
  }

  .admin-user-layout {
    grid-template-columns: 1fr;
  }

  .admin-workspace {
    grid-template-columns: 1fr;
  }

  .admin-question-layout {
    grid-template-columns: 1fr;
  }

  .admin-question-sidebar {
    position: static;
  }

  .admin-mode-filter-list {
    grid-template-columns: repeat(3, minmax(110px, 1fr));
  }

  #adminTabsCard {
    position: static;
  }

  .admin-tabs {
    grid-template-columns: repeat(4, minmax(120px, 1fr));
  }

  .admin-tab {
    text-align: center;
  }

  .settings-layout {
    grid-template-columns: 1fr;
  }

  .settings-sidebar {
    position: static;
  }

  .settings-nav {
    grid-template-columns: repeat(3, minmax(110px, 1fr));
    gap: 0.34rem;
  }

  .settings-nav-btn {
    text-align: center;
    padding: 0.52rem 0.54rem;
  }

  .board-search-grid {
    grid-template-columns: repeat(2, minmax(180px, 1fr));
  }

  .dm-layout {
    grid-template-columns: 1fr;
  }

  .admin-dm-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 840px) {
  .shell {
    width: min(100%, calc(100% - 0.55rem));
    gap: 0.5rem;
  }

  .topbar {
    flex-direction: column;
    align-items: stretch;
    padding: 0.72rem 0.78rem;
  }

  .header-actions {
    justify-items: start;
  }

  .section-head,
  .inline-actions {
    flex-wrap: wrap;
  }

  .top-nav {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.3rem;
    padding: 0.3rem;
  }

  .top-nav.has-admin {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav-btn {
    min-height: 46px;
    font-size: 0.95rem;
    padding: 0.62rem 0.38rem;
  }

  .card {
    padding: 0.76rem 0.76rem;
    gap: 0.55rem;
  }

  .view-stage {
    min-height: auto;
  }

  .inline-actions button,
  button,
  input,
  textarea,
  select {
    font-size: 16px;
  }

  .mode-grid {
    grid-template-columns: repeat(2, minmax(110px, 1fr));
  }

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

  .settings-nav {
    grid-template-columns: repeat(2, minmax(110px, 1fr));
  }

  .board-search-grid {
    grid-template-columns: 1fr;
  }

  .admin-tabs {
    grid-template-columns: repeat(2, minmax(120px, 1fr));
  }

  .admin-mode-filter-list {
    grid-template-columns: repeat(2, minmax(110px, 1fr));
  }

  .profile-view-head {
    flex-wrap: wrap;
    align-items: center;
  }

  .profile-view-avatar-slot {
    margin-top: -22px;
  }

  .profile-view-avatar-slot .avatar-badge {
    width: 82px;
    height: 82px;
  }
}

@media (max-width: 680px) {
  .shell {
    width: min(100%, calc(100% - 0.35rem));
    gap: 0.45rem;
  }

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

  .mode-card {
    min-height: 78px;
  }

  .quiz-progress {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.35rem;
  }

  #quizQuestionText {
    font-size: 1.22rem;
  }

  .choice-button {
    font-size: 1.08rem;
    padding: 0.94rem 0.88rem;
    min-height: 62px;
  }

  .modal {
    padding: 0.35rem;
  }

  .modal-card {
    width: calc(100vw - 0.7rem);
    max-height: calc(100vh - 0.7rem);
    padding: 0.72rem 0.68rem;
  }

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

  .admin-user-meta-grid {
    grid-template-columns: 1fr;
  }

  .admin-access-row {
    grid-template-columns: 110px 58px minmax(180px, 1fr) 88px 95px;
    font-size: 0.76rem;
  }

  .follow-user-item {
    flex-direction: column;
    align-items: stretch;
  }

  .follow-user-item .inline-actions {
    justify-content: flex-end;
  }

  .board-subtabs {
    gap: 0.3rem;
  }

  .admin-tabs {
    grid-template-columns: 1fr;
  }

  .board-subtab {
    min-height: 42px;
    padding: 0.48rem 0.72rem;
  }

  .settings-nav {
    grid-template-columns: 1fr;
  }

  .admin-mode-filter-list {
    grid-template-columns: 1fr;
  }

  .settings-nav-btn {
    min-height: 44px;
  }

  .profile-avatar-preview-wrap {
    align-items: flex-start;
    flex-direction: column;
  }

  .profile-view-avatar-slot {
    margin-top: -18px;
    margin-left: 0;
  }

  .profile-view-avatar-slot .avatar-badge {
    width: 72px;
    height: 72px;
  }
}