/* 探究教学平台 — 共享样式（教师端 + 学生端 + Agent 工具） */
@import url('design-tokens.css');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body.platform-page {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  background: var(--edu-bg);
  color: var(--edu-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* 顶栏 */
.platform-header {
  background: var(--edu-surface);
  border-bottom: 1px solid var(--edu-border);
  box-shadow: 0 1px 0 rgba(255,255,255,0.8);
  position: sticky;
  top: 0;
  z-index: 100;
}

.platform-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.platform-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--edu-text);
}

.platform-brand-mark {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--edu-primary) 0%, #0d9488 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: -0.5px;
}

.platform-brand-text {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.platform-brand-sub {
  font-size: 0.7rem;
  color: var(--edu-muted);
  font-weight: 400;
  display: block;
  line-height: 1.2;
}

.platform-role-switch {
  display: flex;
  gap: 4px;
  background: var(--edu-bg);
  padding: 3px;
  border: 1px solid var(--edu-border);
}

.platform-role-btn {
  padding: 6px 14px;
  font-size: 0.82rem;
  font-weight: 600;
  border: none;
  background: transparent;
  color: var(--edu-muted);
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s, color 0.15s;
}

.platform-role-btn:hover { color: var(--edu-text); }

.platform-role-btn.is-active {
  background: var(--edu-surface);
  color: var(--edu-primary);
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.platform-role-btn.is-student.is-active { color: var(--edu-student); }

.platform-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

/* 首页角色卡片 */
.platform-hero {
  text-align: center;
  padding: 40px 0 32px;
}

.platform-hero h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--edu-text);
  margin-bottom: 8px;
  letter-spacing: -0.03em;
}

.platform-hero p {
  color: var(--edu-muted);
  font-size: 0.95rem;
  max-width: 520px;
  margin: 0 auto 32px;
}

.platform-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  max-width: 720px;
  margin: 0 auto;
}

.platform-card {
  background: var(--edu-surface);
  border: 1px solid var(--edu-border);
  padding: 28px 24px;
  text-decoration: none;
  color: inherit;
  display: block;
  box-shadow: var(--shadow-card);
  transition: transform 0.15s, box-shadow 0.15s;
}

.platform-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-edu);
}

.platform-card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.platform-card.teacher .platform-card-icon { background: rgba(0, 123, 170, 0.12); color: var(--edu-teacher); }
.platform-card.student .platform-card-icon { background: rgba(13, 148, 136, 0.12); color: var(--edu-student); }

.platform-card h2 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.platform-card p {
  font-size: 0.88rem;
  color: var(--edu-muted);
  line-height: 1.55;
}

.platform-card-tag {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  background: var(--edu-bg);
  color: var(--edu-primary);
}

.platform-card.student .platform-card-tag { color: var(--edu-student); }

/* 教师工作台 */
.teacher-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--edu-border);
  padding-bottom: 0;
}

.teacher-tab {
  padding: 10px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  border: none;
  background: none;
  color: var(--edu-muted);
  cursor: pointer;
  font-family: inherit;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}

.teacher-tab.is-active {
  color: var(--edu-primary);
  border-bottom-color: var(--edu-primary);
}

a.teacher-tab {
  display: inline-block;
  text-decoration: none;
}

.agent-tool-page-title {
  margin-bottom: var(--space-4);
}

.agent-tool-page-title h1 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--edu-text);
  margin-bottom: var(--space-2);
}

.agent-tool-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--agent-accent);
  color: var(--edu-accent-ink);
  margin-left: var(--space-2);
  vertical-align: middle;
}

.agent-tool-lead {
  font-size: 0.88rem;
  color: var(--edu-muted);
  line-height: 1.65;
  margin: 0;
  padding-left: 1.2rem;
}

.teacher-panel { display: none; }
.teacher-panel.is-active { display: block; }

.edu-panel {
  background: var(--edu-surface);
  border: 1px solid var(--edu-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
  margin-bottom: 20px;
}

.edu-panel h3 {
  font-size: 1rem;
  margin-bottom: 12px;
  color: var(--edu-primary);
}

.edu-panel p.hint {
  font-size: 0.85rem;
  color: var(--edu-muted);
  margin-bottom: 16px;
}

.catalog-panel-details > .catalog-panel-summary,
.resource-mgmt-details > summary,
.resource-orphan-details > .resource-orphan-summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-2);
  cursor: pointer;
  user-select: none;
  font-size: 1rem;
  font-weight: 600;
  color: var(--edu-primary);
  margin: -4px 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid transparent;
  transition: color 0.15s;
}

.catalog-panel-details > .catalog-panel-summary:hover,
.resource-mgmt-details > summary:hover,
.resource-orphan-details > .resource-orphan-summary:hover {
  color: #006a94;
}

.catalog-panel-details[open] > .catalog-panel-summary,
.resource-mgmt-details[open] > summary,
.resource-orphan-details[open] > .resource-orphan-summary {
  border-bottom-color: rgba(0, 123, 170, 0.15);
  margin-bottom: 16px;
}

.catalog-panel-details > .catalog-panel-summary::-webkit-details-marker,
.resource-mgmt-details > summary::-webkit-details-marker,
.resource-orphan-details > .resource-orphan-summary::-webkit-details-marker {
  display: none;
}

.catalog-panel-details > .catalog-panel-summary::before,
.resource-mgmt-details > summary::before,
.resource-orphan-details > .resource-orphan-summary::before {
  content: '▾';
  flex-shrink: 0;
  font-size: 0.9em;
  opacity: 0.75;
  line-height: 1;
  transition: transform 0.15s, opacity 0.15s;
}

.catalog-panel-details:not([open]) > .catalog-panel-summary::before,
.resource-mgmt-details:not([open]) > summary::before,
.resource-orphan-details:not([open]) > .resource-orphan-summary::before {
  transform: rotate(-90deg);
}

.catalog-panel-details > .catalog-panel-summary:hover::before,
.resource-mgmt-details > summary:hover::before,
.resource-orphan-details > .resource-orphan-summary:hover::before {
  opacity: 1;
}

.resource-orphan-details {
  margin-top: var(--space-4);
  border-top: 1px solid var(--edu-border);
  padding-top: var(--space-3);
}

.resource-orphan-details > .resource-orphan-summary {
  font-size: 0.92rem;
  margin: 0 0 var(--space-2);
  padding-bottom: var(--space-2);
}

.resource-orphan-hint {
  margin-bottom: var(--space-3);
  font-size: 0.82rem;
}

.resource-orphan-heading {
  margin: var(--space-4) 0 var(--space-2);
  font-size: 0.9rem;
  color: var(--edu-muted);
  font-weight: 600;
}

.resource-orphan-heading:first-of-type {
  margin-top: 0;
}

#pairResourceTable .resource-url-code,
.resource-orphan-details .resource-url-code {
  font-size: 0.75rem;
  word-break: break-all;
}

/* Agent 工具 Tab（嵌入教师工作台） */
#panel-agents .agent-tool-shell {
  margin-bottom: 0;
}

#panel-agents .agent-mode-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--edu-border);
}

#panel-agents .agent-mode-tab {
  padding: 10px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  background: transparent;
  color: var(--edu-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.15s, border-color 0.15s;
}

#panel-agents .agent-mode-tab:hover {
  color: var(--edu-text);
}

#panel-agents .agent-mode-tab:disabled {
  opacity: 0.55;
  cursor: wait;
}

#panel-agents .agent-main-input {
  margin-bottom: 16px;
}

#panel-agents .agent-panel-inner label,
#panel-agents .agent-advanced-body label {
  display: block;
  margin: 14px 0 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--edu-text);
}

#panel-agents .agent-panel-inner > label:first-of-type,
#panel-agents .agent-advanced-body > label:first-of-type {
  margin-top: 0;
}

#panel-agents .agent-panel-inner input[type="text"],
#panel-agents .agent-panel-inner textarea,
#panel-agents .agent-panel-inner select,
#panel-agents .agent-advanced-body input[type="text"],
#panel-agents .agent-advanced-body textarea,
#panel-agents .agent-advanced-body select {
  width: 100%;
  font-family: inherit;
  font-size: 0.9rem;
  padding: 10px 12px;
  border: 1px solid var(--edu-border);
  border-radius: var(--radius-sm);
  background: var(--edu-surface);
  color: var(--edu-text);
}

#panel-agents .agent-panel-inner textarea,
#panel-agents .agent-advanced-body textarea {
  resize: vertical;
  min-height: 80px;
}

#panel-agents .agent-panel-inner input[type="file"] {
  font-size: 0.9rem;
}

#panel-agents .upload-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

#panel-agents .agent-hint {
  font-size: 0.85rem;
  color: var(--edu-muted);
  margin-top: 6px;
  line-height: 1.55;
}

#panel-agents .agent-preview-line {
  padding: 8px 10px;
  background: var(--edu-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--edu-border);
}

#panel-agents .agent-multi-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 123, 170, 0.28);
  background: rgba(0, 123, 170, 0.08);
  font-size: 0.88rem;
  color: var(--edu-text);
  line-height: 1.5;
}

#panel-agents .agent-banner-link {
  border: none;
  background: none;
  padding: 0;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--edu-primary);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

#panel-agents .agent-banner-link:hover {
  color: var(--edu-primary-dark, #006a94);
}

#panel-agents .agent-advanced {
  margin-bottom: 20px;
  border: 1px solid var(--edu-border);
  border-radius: var(--radius-sm);
  background: var(--edu-bg);
}

#panel-agents .agent-advanced > summary {
  padding: 12px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--edu-primary);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

#panel-agents .agent-advanced > summary::-webkit-details-marker {
  display: none;
}

#panel-agents .agent-advanced-body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--edu-border);
}

#panel-agents .agent-advanced-body > .agent-hint:first-child {
  margin-top: 12px;
}

#panel-agents .agent-check-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 12px 0 0;
  font-size: 0.9rem;
  font-weight: 400;
  cursor: pointer;
}

#panel-agents .agent-action-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: 16px;
  margin-top: 4px;
  border-top: 1px solid var(--edu-border);
}

#panel-agents .agent-menu-panel .edu-btn {
  width: 100%;
  justify-content: flex-start;
  white-space: nowrap;
}

#panel-agents .agent-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--edu-primary);
  text-decoration: none;
}

#panel-agents .agent-link:hover {
  text-decoration: underline;
}

#panel-agents .agent-status {
  margin-top: 12px;
  font-size: 0.88rem;
  color: var(--edu-text);
  line-height: 1.55;
}

#panel-agents .agent-report {
  margin-top: 12px;
  padding: 12px;
  font-size: 0.82rem;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  white-space: pre-wrap;
  background: var(--edu-bg);
  border: 1px solid var(--edu-border);
  border-radius: var(--radius-sm);
  max-height: 280px;
  overflow: auto;
}

.tool-link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.edu-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, transform 0.1s;
}

.edu-btn[hidden],
[hidden].edu-btn {
  display: none !important;
}

.edu-btn-primary {
  background: var(--edu-primary);
  color: #fff;
}

.edu-btn-primary:hover { background: var(--edu-primary-dark); }

.edu-btn-accent {
  background: var(--edu-accent);
  color: var(--edu-accent-ink);
}

.edu-btn-outline {
  background: var(--edu-surface);
  color: var(--edu-primary);
  border: 1px solid var(--edu-border);
}

.edu-btn-outline:hover { background: var(--edu-bg); }

.edu-btn-sm { padding: 6px 12px; font-size: 0.8rem; }

/* 表格 */
.edu-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.edu-table th,
.edu-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--edu-border);
}

.edu-table th {
  font-weight: 600;
  color: var(--edu-muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.edu-table tr:hover td { background: rgba(0, 123, 170, 0.03); }

.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.72rem;
  font-weight: 600;
}

.badge-ok { background: rgba(13, 148, 136, 0.15); color: #0d9488; }
.badge-pending { background: rgba(100, 116, 139, 0.15); color: var(--edu-muted); }
.badge-warn { background: rgba(255, 250, 0, 0.5); color: #854d0e; }
.catalog-badge {
  display: inline-block;
  font-size: 0.72rem;
  padding: 1px 6px;
  border-radius: 4px;
  margin-right: 4px;
  background: rgba(100, 116, 139, 0.12);
  color: var(--edu-muted);
  white-space: nowrap;
}
.badge-sample { background: rgba(13, 148, 136, 0.12); color: #0d9488; }
.badge-shiguang { background: rgba(99, 102, 241, 0.12); color: #4f46e5; }
.badge-static { background: rgba(100, 116, 139, 0.12); color: #475569; }
.badge-action { background: rgba(234, 179, 8, 0.15); color: #a16207; }
.badge-topic { background: rgba(14, 116, 144, 0.1); color: #0e7490; font-weight: 500; }
.badge-teacher { background: rgba(59, 130, 246, 0.12); color: #2563eb; }
.badge-eval { background: rgba(168, 85, 247, 0.12); color: #7c3aed; }
.badge-legacy { background: rgba(120, 113, 108, 0.15); color: #57534e; }
.badge-confound { background: rgba(234, 88, 12, 0.12); color: #c2410c; }
.catalog-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 12px;
}
.catalog-toolbar select { min-width: 120px; }
.category-mgmt-panel {
  margin-bottom: 12px;
  padding: 12px;
  border: 1px solid var(--edu-border, #e2e8f0);
  border-radius: 8px;
  background: rgba(248, 250, 252, 0.8);
}
.category-mgmt-list {
  list-style: none;
  padding: 0;
  margin: 8px 0 0;
  max-height: 160px;
  overflow-y: auto;
}
.category-mgmt-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  font-size: 0.9rem;
}

.catalog-category-cell {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

/* 学生端游戏网格 */
#gameGrid {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.student-category-section {
  margin-bottom: 12px;
  background: var(--edu-surface);
  border: 1px solid var(--edu-border);
  box-shadow: var(--shadow-card);
}

.student-category-section:last-child {
  margin-bottom: 0;
}

.student-category-section[open] {
  padding-bottom: 16px;
}

.student-category-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  list-style: none;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--edu-student, #0d9488);
  margin: 0;
  padding: 14px 16px;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  user-select: none;
}

.student-category-section[open] > .student-category-title {
  border-bottom-color: rgba(13, 148, 136, 0.15);
}

.student-category-title::-webkit-details-marker {
  display: none;
}

.student-category-title::after {
  content: '▾';
  flex-shrink: 0;
  font-size: 0.85em;
  opacity: 0.7;
  transition: transform 0.15s;
}

.student-category-section:not([open]) > .student-category-title::after {
  transform: rotate(-90deg);
}

.student-category-label {
  flex: 1;
}

.student-category-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.6em;
  padding: 2px 8px;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: 999px;
  background: rgba(13, 148, 136, 0.12);
  color: var(--edu-student, #0d9488);
}

.student-category-section > .student-grid {
  padding: 16px 16px 0;
}

.student-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.game-card h3 {
  font-size: 1rem;
  margin-bottom: 6px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.game-card-topic {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 500;
  padding: 1px 8px;
  border-radius: 4px;
  background: rgba(14, 116, 144, 0.1);
  color: #0e7490;
  vertical-align: middle;
}

.game-card {
  background: var(--edu-surface);
  border: 1px solid var(--edu-border);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 0.15s;
}

.game-card:hover { transform: translateY(-2px); }

.game-card-body { padding: 20px; }

.game-card p {
  font-size: 0.85rem;
  color: var(--edu-muted);
  margin-bottom: 16px;
  min-height: 2.5em;
}

.game-card-play {
  display: block;
  width: 100%;
  text-align: center;
  padding: 10px;
  background: var(--edu-student);
  color: #fff;
  font-weight: 600;
  font-size: 0.88rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.game-card-play:hover { background: #0f766e; }

/* 学生游玩页 */
body.play-page {
  margin: 0;
  overflow: hidden;
}

.play-shell {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  background: #0f172a;
}

.play-idle-hint {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  max-width: min(92vw, 520px);
  padding: 10px 16px;
  border-radius: 10px;
  background: rgba(239, 246, 255, 0.96);
  border: 1px solid #bfdbfe;
  color: #1e40af;
  font-size: 0.92rem;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.25);
  pointer-events: none;
}

.play-frame-wrap {
  flex: 1 1 auto;
  width: 100%;
  min-height: 0;
}

.play-frame-wrap iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

.play-fab {
  position: fixed;
  right: max(20px, env(safe-area-inset-right, 0px));
  bottom: max(20px, env(safe-area-inset-bottom, 0px));
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.play-fab.is-dimmed { opacity: 0.55; }

.play-fab.is-dimmed:hover { opacity: 1; }

.play-fab-btn,
.play-fab-menu {
  pointer-events: auto;
}

.play-fab-btn {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  color: var(--edu-primary);
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  font-family: inherit;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.play-fab-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.play-fab-btn:focus-visible {
  outline: 2px solid var(--edu-primary);
  outline-offset: 2px;
}

.play-fab.is-menu-open .play-fab-btn {
  background: var(--edu-primary);
  color: #fff;
}

.play-fab-menu {
  min-width: 200px;
  max-width: min(280px, calc(100vw - 40px));
  background: rgba(255, 255, 255, 0.96);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--edu-border);
  overflow: hidden;
  backdrop-filter: blur(8px);
}

.play-fab-menu-title {
  padding: 12px 14px 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--edu-text);
  border-bottom: 1px solid var(--edu-border);
  line-height: 1.35;
}

.play-fab-item {
  display: block;
  width: 100%;
  padding: 10px 14px;
  font-size: 0.85rem;
  color: var(--edu-text);
  text-decoration: none;
  text-align: left;
  border: none;
  background: transparent;
  font-family: inherit;
  cursor: pointer;
  border-bottom: 1px solid var(--edu-border);
}

.play-fab-item:last-child { border-bottom: none; }

.play-fab-item:hover,
.play-fab-item-btn:hover {
  background: rgba(0, 123, 170, 0.06);
}

.play-fab-status {
  font-size: 0.78rem;
  color: var(--edu-muted);
  cursor: default;
}

.play-fab-status:hover { background: transparent; }

.play-fab-item-btn { color: var(--edu-primary); }

.play-fab-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--edu-muted);
}
.play-fab-toggle input { accent-color: var(--edu-primary); }
.play-path-type-chip {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  z-index: 20;
  max-width: min(520px, 92vw);
  padding: 10px 16px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(0, 123, 170, 0.28);
  box-shadow: 0 8px 24px rgba(15, 40, 60, 0.12);
  color: #0f172a;
  font-size: 0.9rem;
  text-align: center;
  pointer-events: none;
}
.play-path-type-chip[hidden] { display: none !important; }
.play-path-advice-chip {
  position: absolute;
  left: 50%;
  bottom: 64px;
  transform: translateX(-50%);
  z-index: 20;
  max-width: min(520px, 92vw);
  padding: 8px 14px;
  border-radius: 8px;
  background: rgba(248, 250, 252, 0.96);
  border: 1px solid rgba(100, 116, 139, 0.25);
  color: #334155;
  font-size: 0.82rem;
  text-align: center;
  pointer-events: none;
  line-height: 1.45;
}
.play-path-advice-chip[hidden] { display: none !important; }

.form-row {
  margin-bottom: 14px;
}

.form-row label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--edu-muted);
}

.form-row input,
.form-row select,
.form-row textarea {
  width: 100%;
  padding: 8px 10px;
  font-family: inherit;
  font-size: 0.88rem;
  border: 1px solid var(--edu-border);
  background: var(--edu-surface);
}

.judge-result-box {
  margin-top: 16px;
  padding: 16px;
  background: var(--edu-bg);
  border-left: 3px solid var(--edu-primary);
  font-size: 0.88rem;
}

.judge-result-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.judge-time {
  font-size: 0.75rem;
  color: var(--edu-muted);
}

.judge-path-hint {
  font-size: 0.82rem;
  color: var(--edu-muted);
  margin: 0 0 10px;
}

.judge-route-hint {
  font-size: 0.78rem;
  color: var(--edu-muted);
  margin: 0 0 10px;
  padding: 6px 10px;
  background: var(--edu-surface);
  border-radius: 6px;
  line-height: 1.45;
}

.judge-comment {
  white-space: pre-wrap;
  line-height: 1.65;
  font-size: 0.85rem;
}

.judge-result-loading {
  color: var(--edu-muted);
}

.judge-level-badge {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--edu-surface);
  border: 1px solid var(--edu-border);
  color: var(--edu-muted);
}

.judge-summary {
  margin: 0 0 10px;
  line-height: 1.55;
  font-size: 0.88rem;
}

.judge-list-block {
  margin-bottom: 8px;
}

.judge-list-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--edu-primary);
  margin-bottom: 4px;
}

.judge-list-label-gap {
  color: #c45a11;
}

.judge-list {
  margin: 0 0 0 1.1em;
  padding: 0;
  font-size: 0.84rem;
  line-height: 1.5;
}

.judge-suggestion {
  margin: 10px 0 0;
  padding: 8px 10px;
  background: var(--edu-surface);
  border-radius: 6px;
  font-size: 0.84rem;
  line-height: 1.5;
}

.judge-legacy-details {
  margin-top: 10px;
  font-size: 0.82rem;
}

.judge-legacy-details summary {
  cursor: pointer;
  color: var(--edu-muted);
  user-select: none;
}

.session-detail-title {
  font-size: 1rem;
  margin-bottom: 4px;
}

.session-task-line {
  margin-bottom: 12px;
  font-size: 0.82rem;
}

.session-section-label {
  font-size: 0.82rem;
  margin-bottom: 8px;
  color: var(--edu-muted);
}

.session-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}

.session-action-hint {
  font-size: 0.8rem;
}

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--edu-muted);
}

.sessions-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 16px 0 8px;
}

.stat-card {
  background: var(--edu-bg);
  border: 1px solid var(--edu-border);
  border-radius: 10px;
  padding: 14px 16px;
  text-align: center;
}

.stat-card.stat-pending { border-color: #fbbf24; background: #fffbeb; }
.stat-card.stat-judged { border-color: #86efac; background: #f0fdf4; }

.judged-overview {
  margin: 0 0 16px;
  padding: 12px 14px;
  background: var(--edu-bg);
  border: 1px solid var(--edu-border);
  border-radius: 10px;
}

.classroom-board {
  margin: 0 0 16px;
  padding: 12px 14px;
}
.classroom-board-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
}
.classroom-board-head h4 { margin: 0; font-size: 0.95rem; }
.classroom-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  font-size: 0.85rem;
  margin-bottom: 10px;
}
.classroom-dist { width: 100%; color: var(--edu-text-muted, #64748b); font-size: 0.8rem; }
.classroom-table-wrap { overflow-x: auto; max-height: 280px; overflow-y: auto; }
.classroom-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}
.classroom-table th, .classroom-table td {
  border-bottom: 1px solid var(--edu-border, #e2e8f0);
  padding: 6px 8px;
  text-align: left;
  white-space: nowrap;
}
.classroom-table th { position: sticky; top: 0; background: #fff; font-weight: 600; }

.judged-overview-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.judged-overview-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--edu-text);
}

.verdict-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.verdict-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
}

.verdict-pill.verdict-pass { background: #dcfce7; color: #166534; }
.verdict-pill.verdict-progress { background: #dbeafe; color: #1e40af; }
.verdict-pill.verdict-learning { background: #ffedd5; color: #9a3412; }
.verdict-pill.verdict-other { background: #f1f5f9; color: #475569; }

.judged-student-chips {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.judged-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  font-size: 0.82rem;
  font-family: inherit;
  border: 1px solid var(--edu-border);
  border-radius: 999px;
  background: var(--edu-surface);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.judged-chip:hover { background: var(--edu-bg); }
.judged-chip.verdict-pass { border-color: #86efac; }
.judged-chip.verdict-progress { border-color: #93c5fd; }
.judged-chip.verdict-learning { border-color: #fdba74; }

.judged-chip-name { font-weight: 600; color: var(--edu-text); }
.judged-chip-verdict { font-size: 0.75rem; color: var(--edu-muted); }

.badge-verdict {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
}

.badge-verdict.verdict-pass { background: #dcfce7; color: #166534; }
.badge-verdict.verdict-progress { background: #dbeafe; color: #1e40af; }
.badge-verdict.verdict-learning { background: #ffedd5; color: #9a3412; }
.badge-verdict.verdict-other { background: #f1f5f9; color: #475569; }

.stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--edu-text);
  line-height: 1.2;
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--edu-muted);
  margin-top: 4px;
}

.sessions-stats-sub {
  font-size: 0.78rem;
  color: var(--edu-muted);
  margin: 0 0 16px;
}

.sessions-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.sessions-select,
.sessions-search {
  padding: 6px 10px;
  font-size: 0.85rem;
  border: 1px solid var(--edu-border);
  border-radius: 6px;
  background: var(--edu-surface);
}

.sessions-search { flex: 1; min-width: 160px; max-width: 240px; }

.sessions-split {
  display: grid;
  grid-template-columns: minmax(200px, 260px) 1fr;
  gap: 16px;
  height: min(480px, calc(100vh - 340px));
  min-height: 320px;
  border: 1px solid var(--edu-border);
  border-radius: 10px;
  overflow: hidden;
}

.student-list-panel {
  background: var(--edu-bg);
  border-right: 1px solid var(--edu-border);
  display: flex;
  flex-direction: column;
}

.student-list-header {
  padding: 10px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--edu-muted);
  border-bottom: 1px solid var(--edu-border);
}

.student-list {
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-y: auto;
  flex: 1;
}

.student-list-item {
  padding: 8px 12px;
  border-bottom: 1px solid var(--edu-border);
  cursor: pointer;
  transition: background 0.15s;
}

.student-list-item:hover { background: rgba(13, 148, 136, 0.06); }

.student-list-item.is-active {
  background: rgba(13, 148, 136, 0.12);
  border-left: 3px solid var(--edu-primary);
}

.student-list-row {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 28px;
}

.student-list-name {
  flex: 1;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--edu-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.student-list-count {
  font-size: 0.72rem;
  color: var(--edu-muted);
  flex-shrink: 0;
}

.student-list-meta {
  display: none;
}

.session-detail-panel {
  padding: 16px 20px;
  overflow-y: auto;
  background: var(--edu-surface);
}

.session-detail-empty {
  color: var(--edu-muted);
  text-align: center;
  padding: 80px 20px;
  font-size: 0.9rem;
}

.session-timeline {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.session-list-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.session-list-head .session-section-label {
  margin: 0;
}

.session-list-head-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.session-timeline-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--edu-border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  margin: 0;
}

.session-row-delete {
  flex-shrink: 0;
  margin-left: auto;
}

.session-row-delete:hover {
  border-color: #dc2626;
  color: #dc2626;
}

.session-pick-cb {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  cursor: pointer;
  accent-color: var(--edu-primary);
}

.session-timeline-body {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}

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

.sessions-select-all {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--edu-text);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

.sessions-select-all input {
  width: 16px;
  height: 16px;
  accent-color: var(--edu-primary);
  cursor: pointer;
}

.sessions-select-count {
  font-size: 0.78rem;
  white-space: nowrap;
}

.sessions-select-count:empty {
  display: none;
}

.session-timeline-item.is-active {
  border-color: var(--edu-primary);
  background: rgba(13, 148, 136, 0.06);
}

.session-summary {
  margin-bottom: 20px;
}

.session-summary h4 {
  font-size: 0.85rem;
  margin-bottom: 8px;
  color: var(--edu-muted);
}

.summary-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.summary-tag {
  font-size: 0.75rem;
  padding: 3px 8px;
  background: var(--edu-bg);
  border: 1px solid var(--edu-border);
  border-radius: 999px;
}

.judge-verdict {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

@media (max-width: 768px) {
  .sessions-stats { grid-template-columns: repeat(2, 1fr); }
  .sessions-split { grid-template-columns: 1fr; min-height: auto; }
  .student-list-panel { max-height: 220px; }
}

@media (max-width: 640px) {
  .platform-header-inner { flex-wrap: wrap; height: auto; padding: 12px 16px; }
  .platform-cards { grid-template-columns: 1fr; }
}