/* Power Up 备课系统专属样式表 - Modern Clean & Responsive UI */
:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --secondary: #0ea5e9;
  --accent: #f59e0b;
  --success: #10b981;
  --danger: #ef4444;
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* App Header */
.app-header {
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.header-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #4f46e5, #0ea5e9);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.25rem;
  font-weight: 800;
  box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3);
}

.brand-title h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-title p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Level Switcher */
.level-switcher {
  display: flex;
  background: #f1f5f9;
  padding: 4px;
  border-radius: var(--radius-full);
  gap: 4px;
}

.level-btn {
  padding: 6px 16px;
  border: none;
  background: transparent;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.level-btn:hover {
  color: var(--primary);
}

.level-btn.active {
  background: #ffffff;
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.btn-placement-nav {
  background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 100%);
  color: #4f46e5 !important;
  font-weight: 700;
  border: 1px solid #ddd6fe;
}

.btn-placement-nav:hover {
  background: linear-gradient(135deg, #ede9fe 0%, #e0e7ff 100%);
  color: #4338ca !important;
}

.btn-placement-nav.active {
  background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%) !important;
  color: #ffffff !important;
  border-color: transparent !important;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.35) !important;
}

/* Main Layout */
.app-body {
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
  flex: 1;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1.5rem;
  padding: 1.5rem;
}

/* Sidebar Navigation */
.sidebar {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  height: calc(100vh - 110px);
  position: sticky;
  top: 90px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.sidebar-header {
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-badge {
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.unit-tree-container {
  overflow-y: auto;
  flex: 1;
  padding-right: 4px;
}

.unit-tree-container::-webkit-scrollbar {
  width: 5px;
}
.unit-tree-container::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}

.unit-group {
  margin-bottom: 0.75rem;
}

.unit-header-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.85rem;
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  text-align: left;
  transition: all 0.2s;
}

.unit-header-btn:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

.unit-header-btn.active {
  background: var(--primary-light);
  color: var(--primary);
  border-color: #c7d2fe;
}

.lesson-sublist {
  padding-left: 0.75rem;
  margin-top: 0.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.lesson-nav-btn {
  padding: 0.5rem 0.75rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.15s;
}

.lesson-nav-btn:hover {
  background: #f1f5f9;
  color: var(--text-main);
}

.lesson-nav-btn.active {
  background: #e0e7ff;
  color: var(--primary);
  font-weight: 600;
}

.lesson-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #94a3b8;
}

.lesson-nav-btn.active .lesson-dot {
  background: var(--primary);
}

/* Main Content Area */
.main-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-width: 0;
}

/* Tabs Bar */
.module-tabs {
  display: flex;
  background: #ffffff;
  padding: 6px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  gap: 6px;
  overflow-x: auto;
}

.tab-btn {
  flex: 1;
  min-width: 140px;
  padding: 0.65rem 1rem;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s;
  white-space: nowrap;
}

.tab-btn:hover {
  background: #f8fafc;
  color: var(--text-main);
}

.tab-btn.active {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.25);
}

/* View Sections */
.view-section {
  display: none;
}
.view-section.active {
  display: block;
}

/* Cards & Containers */
.content-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Objectives Grid */
.objectives-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.obj-box {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.obj-box.vocab { border-left: 4px solid var(--primary); }
.obj-box.sentence { border-left: 4px solid var(--secondary); }
.obj-box.phonics { border-left: 4px solid var(--accent); }
.obj-box.mission { border-left: 4px solid var(--success); }

.obj-title {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.word-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.word-tag {
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 3px 8px;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.word-tag b { color: var(--primary); }

.sentence-item {
  font-size: 0.875rem;
  margin-bottom: 0.4rem;
  padding: 0.4rem 0.6rem;
  background: #ffffff;
  border-radius: var(--radius-sm);
  border-left: 2px solid #cbd5e1;
}
.sentence-item .en { font-weight: 600; color: #1e293b; }
.sentence-item .cn { color: #64748b; font-size: 0.8rem; margin-top: 2px; }

/* Teaching Flow Timeline */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  margin-left: 0.5rem;
  padding-left: 1.5rem;
  border-left: 2px dashed #cbd5e1;
}

.timeline-step {
  position: relative;
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  transition: all 0.2s;
}

.timeline-step:hover {
  background: #ffffff;
  box-shadow: var(--shadow-sm);
  border-color: #cbd5e1;
}

.step-marker {
  position: absolute;
  left: -2.05rem;
  top: 1rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #ffffff;
  border: 3px solid var(--primary);
}

.timeline-step.break-step {
  background: #fffbeb;
  border-color: #fde68a;
}
.timeline-step.break-step .step-marker {
  border-color: var(--accent);
}

.step-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.step-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.step-time {
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.step-desc {
  font-size: 0.875rem;
  color: #334155;
  line-height: 1.6;
}

/* Game Cards */
.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1rem;
}

.game-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.game-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, #f59e0b, #ef4444);
}

.game-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.game-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.game-rules {
  font-size: 0.875rem;
  color: #334155;
  background: #f8fafc;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

/* Homework Card Preview & Export Container */
.homework-card-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.card-actions-bar {
  display: flex;
  gap: 0.75rem;
  width: 100%;
  max-width: 680px;
  justify-content: flex-end;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
}
.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: #f1f5f9;
  color: #334155;
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background: #e2e8f0;
}

.btn-success {
  background: var(--success);
  color: #ffffff;
}
.btn-success:hover {
  background: #059669;
}

.preset-chip-btn {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  color: #334155;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.preset-chip-btn:hover {
  background: #eff6ff;
  border-color: #3b82f6;
  color: #1d4ed8;
  transform: translateY(-1px);
}


/* The Graphical Homework Card (rendered like a poster) */
.poster-card {
  width: 100%;
  max-width: 680px;
  background: #ffffff;
  border-radius: 20px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08), 0 5px 15px rgba(0, 0, 0, 0.04);
  border: 1px solid #e2e8f0;
  overflow: hidden;
  font-size: 14px;
}

.poster-header {
  background: linear-gradient(135deg, #4f46e5 0%, #3b82f6 50%, #06b6d4 100%);
  color: #ffffff;
  padding: 1.75rem 2rem 1.25rem 2rem;
  position: relative;
}

.poster-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.poster-title {
  font-size: 1.45rem;
  font-weight: 800;
  line-height: 1.3;
}

.poster-subtitle {
  font-size: 0.875rem;
  opacity: 0.9;
  margin-top: 0.25rem;
}

.poster-meta-strip {
  display: flex;
  background: rgba(0, 0, 0, 0.15);
  margin: 1rem -2rem -1.25rem -2rem;
  padding: 0.6rem 2rem;
  font-size: 0.8125rem;
  gap: 1.5rem;
}

.poster-body {
  padding: 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.poster-section {
  border-bottom: 1px dashed #e2e8f0;
  padding-bottom: 1rem;
}
.poster-section:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.poster-sec-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: #1e293b;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.65rem;
}

.task-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.task-item {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  background: #f8fafc;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  border: 1px solid #f1f5f9;
}

.task-icon {
  font-size: 1.1rem;
  line-height: 1;
  margin-top: 2px;
}

.task-text {
  flex: 1;
  font-size: 0.875rem;
  color: #334155;
  line-height: 1.5;
}
.task-text strong {
  color: #0f172a;
}

.poster-footer {
  background: #f8fafc;
  padding: 1rem 2rem;
  border-top: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: #64748b;
}

/* Feedback Generator Section */
.feedback-editor-grid {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 1.5rem;
}

.roster-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.student-select-box {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.form-select, .form-input, .form-textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  background: #ffffff;
  color: var(--text-main);
  outline: none;
  transition: border-color 0.2s;
}

.form-select:focus, .form-input:focus, .form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.score-items-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-height: 480px;
  overflow-y: auto;
  padding-right: 4px;
}

.score-row {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.15s;
}

.score-row.disabled {
  opacity: 0.45;
  background: #f1f5f9;
}

.score-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.score-check {
  cursor: pointer;
}

.score-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-main);
}

.star-rating {
  display: flex;
  gap: 2px;
}

.star-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  color: #cbd5e1;
  padding: 2px;
  transition: color 0.15s;
}

.star-btn.active {
  color: #f59e0b;
}

.feedback-preview-pane {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.feedback-text-box {
  width: 100%;
  height: 220px;
  font-family: inherit;
  line-height: 1.6;
}

/* Printable / Export 1-Page PDF Poster */
.feedback-pdf-poster {
  background: #ffffff;
  width: 100%;
  max-width: 650px;
  border-radius: 16px;
  border: 1px solid #e2e8f0;
  box-shadow: var(--shadow-md);
  padding: 2rem;
  margin: 0 auto;
}

.pdf-header {
  border-bottom: 2px solid #4f46e5;
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pdf-student-badge {
  font-size: 1.25rem;
  font-weight: 800;
  color: #4f46e5;
}

.pdf-date {
  font-size: 0.8125rem;
  color: #64748b;
}

.pdf-scores-summary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.pdf-score-cell {
  background: #f8fafc;
  border: 1px solid #f1f5f9;
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
}

.pdf-comment-body {
  background: #fdfaf3;
  border-left: 4px solid #f59e0b;
  padding: 1rem 1.25rem;
  border-radius: 0 8px 8px 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: #334155;
  margin-bottom: 1.5rem;
  white-space: pre-wrap;
}

.pdf-badge-stamp {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
}

.honor-badge {
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  color: #ffffff;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 700;
  box-shadow: 0 4px 10px rgba(245, 158, 11, 0.3);
}

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.modal-overlay.active {
  display: flex;
}

.modal-content {
  background: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
}
.modal-close {
  background: transparent;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--text-muted);
}

/* Toast Message */
.toast-notice {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: #0f172a;
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.toast-notice.show {
  transform: translateY(0);
  opacity: 1;
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  .app-body {
    grid-template-columns: 1fr;
  }
  .sidebar {
    height: auto;
    position: static;
  }
  .feedback-editor-grid {
    grid-template-columns: 1fr;
  }
}

/* Brand Logo Image in Header */
.brand-logo-img {
  height: 48px;
  max-width: 220px;
  object-fit: contain;
  border-radius: 6px;
  transition: transform 0.2s ease;
}
.brand-logo-img:hover {
  transform: scale(1.02);
}

/* Class and Student Selector Bar in Feedback Generator */
.class-student-bar {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
  background: #f8fafc;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}
.class-item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 0.6rem;
  background: #ffffff;
  transition: all 0.2s ease;
}
.class-item-row:hover {
  border-color: #cbd5e1;
  background: #f8fafc;
}
.class-item-row.active {
  border-color: var(--primary);
  background: var(--primary-light);
}

/* Document Cards & Resource Grid */
.doc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}
.doc-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}
.doc-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.doc-card-thumb {
  height: 150px;
  background: #f1f5f9;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
  border: 1px solid #e2e8f0;
}
.doc-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  transition: transform 0.2s ease;
}
.doc-card-thumb:hover img {
  transform: scale(1.03);
}
.doc-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 3px;
}
.doc-badge.copybook { background: #e0e7ff; color: #4338ca; }
.doc-badge.sight_word { background: #fef3c7; color: #b45309; }
.doc-badge.knowledge_list { background: #dcfce7; color: #15803d; }
.doc-badge.courseware { background: #f3e8ff; color: #7e22ce; }

.doc-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.4rem;
  line-height: 1.4;
}
.doc-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
  flex: 1;
  line-height: 1.5;
}
.doc-actions {
  display: flex;
  gap: 0.4rem;
}
.doc-actions button, .doc-actions a {
  flex: 1;
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 600;
  text-align: center;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
}

/* Document Preview Modal Styling */
.preview-modal-dialog {
  max-width: 900px;
  width: 92vw;
  max-height: 92vh;
  display: flex;
  flex-direction: column;
}
.preview-modal-body {
  flex: 1;
  overflow-y: auto;
  text-align: center;
  padding: 1.25rem;
  background: #f8fafc;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
}
.preview-modal-body img {
  max-width: 100%;
  height: auto;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  border-radius: 6px;
  margin-bottom: 1rem;
  background: #fff;
}

/* Direct Print Engine */
@media print {
  body * {
    visibility: hidden !important;
  }
  #print-mount-area, #print-mount-area * {
    visibility: visible !important;
  }
  #print-mount-area {
    position: absolute !important;
    left: 0 !important;
    top: 0 !important;
    width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
    background: #fff !important;
  }
  #print-mount-area img {
    width: 100% !important;
    height: auto !important;
    max-height: 100vh !important;
    object-fit: contain !important;
    page-break-after: always !important;
    display: block !important;
  }
}

/* Placement Test (定级测) Styling */
.placement-container {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.placement-hero-bar {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.placement-path-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #eff6ff;
  color: #1d4ed8;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
  border: 1px solid #bfdbfe;
}
.placement-switchers {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.selector-group {
  display: inline-flex;
  background: #f1f5f9;
  padding: 3px;
  border-radius: var(--radius-sm);
  gap: 3px;
}
.selector-btn {
  border: none;
  background: transparent;
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}
.selector-btn:hover {
  color: var(--text-main);
}
.selector-btn.active {
  background: #ffffff;
  color: var(--primary);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}
.placement-audio-card {
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4338ca 100%);
  color: #ffffff;
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  box-shadow: 0 6px 18px rgba(49, 46, 129, 0.25);
}
.audio-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.audio-parts-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.85rem;
}
.audio-part-pill {
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #ffffff;
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.audio-part-pill:hover, .audio-part-pill.active {
  background: #fbbf24;
  color: #1e1b4b;
  border-color: #fbbf24;
  font-weight: 700;
}
.placement-view-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #ffffff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 0.75rem;
}
.placement-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}
.placement-page-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}
.placement-page-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.placement-page-card img {
  width: 100%;
  height: auto;
  display: block;
  cursor: pointer;
  background: #f8fafc;
}
.placement-page-footer {
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Button & Feedback Enhancements */
.btn-danger {
  background: var(--danger);
  color: #ffffff;
}
.btn-danger:hover {
  background: #dc2626;
}

.mode-tab-btn {
  transition: all 0.2s ease-in-out;
  cursor: pointer;
}
.mode-tab-btn:hover {
  filter: brightness(0.96);
}


/* ============================================================
   v2.3 品牌统一刷新：对齐打卡主站（思阅原版 Know How Academy）
   暖橙主色 / 大圆角白卡 / 橙色渐变胶囊 / 精简冗余标签
   ============================================================ */
:root {
  --primary: #FF6B2C;
  --primary-hover: #EA5316;
  --primary-light: #FFF3EC;
  --secondary: #3B82F6;
  --accent: #FFB800;
  --success: #10B981;
  --danger: #EF4444;
  --bg-main: #F7F9FC;
  --brand-grad: linear-gradient(135deg, #FF7A33 0%, #FF5522 100%);
}

body {
  background: radial-gradient(circle at 15% 10%, #FFF5EB 0%, #F2F6FF 55%, #F6F1FF 100%);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* ---------- 顶栏 ---------- */
.app-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.9);
  box-shadow: 0 2px 10px rgba(30, 41, 59, 0.04);
}
.brand-title p { display: none; }   /* 去掉冗长副标题，避免与右侧拥挤 */
.brand-title h1 { font-size: 1.05rem; }

.level-switcher { background: #F1F5F9; }
.level-btn.active {
  background: var(--brand-grad);
  color: #fff;
  box-shadow: 0 4px 12px rgba(255, 92, 40, 0.32);
}
.level-btn:hover { color: var(--primary); }
.btn-placement-nav {
  background: #FFF3EC; color: #EA580C !important; border: 1px solid #FED7AA;
}
.btn-placement-nav.active {
  background: var(--brand-grad) !important; color: #fff !important;
  border-color: transparent !important; box-shadow: 0 4px 12px rgba(255, 92, 40, 0.32) !important;
}

/* ---------- 布局与卡片 ---------- */
.content-card, .sidebar, .roster-card {
  border-radius: 20px;
  border: 1px solid rgba(226, 232, 240, 0.85);
  box-shadow: 0 6px 20px rgba(30, 41, 59, 0.05);
}
.content-card { padding: 1.25rem; }

.card-header { flex-wrap: wrap; gap: 0.5rem; }
.card-title { font-size: 1rem; }

/* 模块 Tab：激活态用主站式深色胶囊 */
.module-tabs { border-radius: 16px; }
.tab-btn { min-width: 0; flex: 1 0 auto; padding: 0.55rem 0.9rem; font-size: 0.8125rem; border-radius: 12px; }
.tab-btn.active {
  background: var(--brand-grad);
  box-shadow: 0 4px 12px rgba(255, 92, 40, 0.3);
}

/* ---------- 按钮 ---------- */
.action-btn { border-radius: 999px; padding: 0.5rem 1rem; font-size: 0.8125rem; }
.btn-primary { background: var(--brand-grad); box-shadow: 0 4px 12px rgba(255, 92, 40, 0.28); }
.btn-primary:hover { background: linear-gradient(135deg, #FF7A33, #FF4511); transform: translateY(-1px); }
.btn-secondary { background: #F8FAFC; border: 1px solid #E2E8F0; }
.btn-success { background: linear-gradient(135deg, #10B981, #059669); }

/* ---------- 词汇/句型标签：软色胶囊，防止重叠换行难看 ---------- */
.word-tags { gap: 0.35rem; }
.word-tag {
  background: var(--primary-light);
  border: 1px solid #FFE0CC;
  padding: 4px 10px;
  font-size: 0.8125rem;
  line-height: 1.4;
}
.word-tag b { color: #EA580C; margin-right: 2px; }

.obj-box { border-radius: 14px; }
.obj-box.vocab { border-left: 4px solid #FF6B2C; }
.obj-box.sentence { border-left: 4px solid #3B82F6; }
.obj-box.phonics { border-left: 4px solid #FFB800; }
.obj-box.mission { border-left: 4px solid #10B981; }
.obj-title { font-size: 0.78rem; }

/* ---------- 授课流程时间线 ---------- */
.timeline-step { border-radius: 14px; }
.step-marker { border-color: var(--primary); }
.step-header { flex-wrap: wrap; gap: 0.4rem; }
.step-name { font-size: 0.9rem; }
.step-time { font-size: 0.72rem; white-space: nowrap; }

/* ---------- 游戏卡片 ---------- */
.game-card { border-radius: 16px; }
.game-card::before { background: linear-gradient(90deg, #FF6B2C, #FFB800); }
.game-title { font-size: 0.92rem; }
.game-meta { font-size: 0.78rem; }

/* ---------- 文档卡片：badge 与说明同行不重叠 ---------- */
.doc-card-header { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; margin: 0.5rem 0 0.35rem; }
.doc-card { border-radius: 16px; }
.doc-badge { font-size: 10px; }

/* ---------- 侧栏激活态 ---------- */
.unit-header-btn.active { background: var(--primary-light); color: #EA580C; border-color: #FED7AA; }
.lesson-nav-btn.active { background: var(--primary-light); color: #EA580C; }
.sidebar-badge { background: var(--primary-light); color: #EA580C; }

/* ---------- 表单聚焦 ---------- */
.form-select:focus, .form-input:focus, .form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 107, 44, 0.15);
}

/* ---------- 定级测/音频卡保留深紫，但按钮胶囊化 ---------- */
.placement-path-badge { background: #FFF3EC; color: #EA580C; border: 1px solid #FED7AA; }
.selector-btn.active { color: var(--primary); }

/* 紧凑化：header 元信息卡顶部色条改橙色 */
.content-card[style*="#4f46e5"] { border-top-color: #FF6B2C !important; }


/* ==========================================================================
   推送打卡任务模态框 (#pu-push-task-modal)
   ========================================================================== */
#pu-push-task-modal {
  z-index: 1000;
}
.ptm-dialog {
  max-width: 820px !important;
  width: 95vw;
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  padding: 0 !important;
  border-radius: 18px !important;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.35);
  background: #ffffff;
  animation: ptmFadeIn 0.2s ease-out;
}
@keyframes ptmFadeIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}
.ptm-header {
  background: linear-gradient(135deg, #FF6B2C 0%, #EA580C 100%);
  padding: 1rem 1.35rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #ffffff;
}
.ptm-body {
  padding: 1.25rem 1.35rem;
  overflow-y: auto;
  flex: 1;
}
.ptm-footer {
  padding: 0.85rem 1.35rem;
  background: #f8fafc;
  border-top: 1px solid #e2e8f0;
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  align-items: center;
}
.ptm-form-group {
  margin-bottom: 1rem;
}
.ptm-label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 6px;
}
.ptm-mini-btn {
  background: #ffedd5;
  color: #c2410c;
  border: 1px solid #fed7aa;
  padding: 2px 10px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
}
.ptm-mini-btn:hover {
  background: #fed7aa;
}
.ptm-students-box {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  max-height: 130px;
  overflow-y: auto;
  background: #f8fafc;
  padding: 8px;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
}
.ptm-stu-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 99px;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  font-size: 12px;
  font-weight: 600;
  color: #334155;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}
.ptm-stu-chip:hover {
  border-color: #f97316;
  background: #fff7ed;
}
.ptm-stu-chip.active {
  background: #fff3ec;
  border-color: #ea580c;
  color: #c2410c;
  font-weight: 700;
}
.ptm-stu-chip input[type="checkbox"] {
  accent-color: #ea580c;
  cursor: pointer;
}
.hidden {
  display: none !important;
}

/* ==========================================================================
   移动端课时折叠导航栏与顶部工具条
   ========================================================================== */
.mobile-nav-toggle-bar {
  display: none;
  gap: 8px;
  margin-bottom: 0.75rem;
}
.mobile-toggle-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 12px;
  background: #fff3ec;
  border: 1px solid #fed7aa;
  color: #ea580c;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}
.mobile-toggle-btn.secondary {
  flex: 0 0 auto;
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #334155;
}

/* ==========================================================================
   阅读舒适度与排版换行规则深度优化 (修复杂乱换行)
   ========================================================================== */
.content-card,
.timeline-step,
.game-card,
.obj-box,
.sentence-item,
.step-desc,
.game-rules {
  word-break: normal;
  overflow-wrap: break-word;
  line-height: 1.65;
}
.sentence-item .en {
  font-size: 0.95rem;
  line-height: 1.5;
  letter-spacing: 0.2px;
  word-break: normal;
  overflow-wrap: break-word;
}
.sentence-item .cn {
  font-size: 0.825rem;
  line-height: 1.5;
  color: #64748b;
  margin-top: 3px;
}
.step-desc {
  font-size: 0.88rem;
  line-height: 1.7;
  color: #334155;
}
.game-rules {
  font-size: 0.84rem;
  line-height: 1.65;
  color: #475569;
  background: #f8fafc;
  padding: 8px 12px;
  border-radius: 8px;
  margin-top: 6px;
  border-left: 3px solid #cbd5e1;
}
.word-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.word-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: normal;
  word-break: normal;
}

/* ==========================================================================
   统一顶部跳转与功能胶囊按钮规范 (Top Navigation Action Pills)
   ========================================================================== */
.top-nav-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  flex-wrap: wrap;
}

/* 统一按钮基类 (兼容 a 链接与 button/div) */
.top-nav-btn,
.top-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 32px;
  padding: 0 11px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
  outline: none;
  background: #ffffff;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05);
  user-select: none;
  box-sizing: border-box;
  -webkit-appearance: none;
}

.top-nav-btn:hover,
.top-nav-link:hover {
  transform: translateY(-1.5px);
  box-shadow: 0 3px 8px rgba(15, 23, 42, 0.1);
  text-decoration: none;
}

.top-nav-btn:active,
.top-nav-link:active {
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05);
}

/* 内部小图标与徽章微排版 */
.top-nav-btn .nav-pill-icon,
.top-nav-link .nav-pill-icon {
  font-size: 13px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.top-nav-btn .nav-pill-text,
.top-nav-link .nav-pill-text {
  letter-spacing: -0.01em;
}

.top-nav-btn .nav-pill-arrow,
.top-nav-link .nav-pill-arrow {
  font-size: 10px;
  opacity: 0.6;
  transition: transform 0.2s ease, opacity 0.2s ease;
  margin-left: -1px;
}

.top-nav-btn:hover .nav-pill-arrow,
.top-nav-link:hover .nav-pill-arrow {
  opacity: 1;
  transform: translate(1px, -1px);
}

/* 1. 教师账号胶囊 (User Identity Pill) - 雅致琥珀金 */
.nav-pill-user {
  background: #ffffff !important;
  border: 1.5px solid #fcd34d !important;
  color: #78350f !important;
  box-shadow: 0 1px 3px rgba(245, 158, 11, 0.12) !important;
  gap: 6px !important;
  padding-left: 9px !important;
  padding-right: 5px !important;
}
.nav-pill-user:hover {
  background: #fffbeb !important;
  border-color: #f59e0b !important;
  box-shadow: 0 3px 10px rgba(245, 158, 11, 0.2) !important;
}
.nav-pill-user #pu-user-name,
.nav-pill-user .nav-pill-name {
  color: #0f172a;
  font-weight: 800;
  max-width: 90px;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.01em;
}
.nav-pill-user #pu-user-role-badge,
.nav-pill-user .nav-pill-role {
  background: #fef3c7;
  color: #b45309;
  padding: 2px 6px;
  border-radius: 9999px;
  font-size: 10px;
  font-weight: 800;
  line-height: 1;
  border: 1px solid #fde68a;
}
.nav-pill-user .nav-pill-action {
  background: #4f46e5;
  color: #ffffff;
  padding: 3px 8px;
  border-radius: 9999px;
  font-size: 10px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.02em;
  transition: background 0.15s ease;
  margin-left: 1px;
}
.nav-pill-user:hover .nav-pill-action {
  background: #4338ca;
}

/* 2. 学员档案 (Student Archive Pill) - 靛蓝雅致 */
.nav-pill-archive {
  background: #eef2ff !important;
  border: 1px solid #c7d2fe !important;
  color: #4338ca !important;
}
.nav-pill-archive:hover {
  background: #e0e7ff !important;
  border-color: #a5b4fc !important;
  color: #3730a3 !important;
}
.nav-pill-archive .nav-pill-count {
  background: #e0e7ff;
  color: #4f46e5;
  padding: 2px 6px;
  border-radius: 9999px;
  font-size: 10px;
  font-weight: 800;
  line-height: 1;
}
.nav-pill-archive:hover .nav-pill-count {
  background: #c7d2fe;
}

/* 3. 学员打卡端 (Student Check-in App) - 活力暖橙 */
.nav-pill-student {
  background: #fff7ed !important;
  border: 1px solid #fed7aa !important;
  color: #c2410c !important;
}
.nav-pill-student:hover {
  background: #ffedd5 !important;
  border-color: #fdba74 !important;
  color: #9a3412 !important;
}

/* 4. 打卡模板库 (Template Studio) - 清新薄荷绿 */
.nav-pill-template {
  background: #ecfdf5 !important;
  border: 1px solid #a7f3d0 !important;
  color: #047857 !important;
}
.nav-pill-template:hover {
  background: #d1fae5 !important;
  border-color: #6ee7b7 !important;
  color: #065f46 !important;
}

/* 5. 排课教务端 (Schedule Admin) - 商务专业蓝 */
.nav-pill-paike {
  background: #eff6ff !important;
  border: 1px solid #bfdbfe !important;
  color: #1d4ed8 !important;
}
.nav-pill-paike:hover {
  background: #dbeafe !important;
  border-color: #93c5fd !important;
  color: #1e40af !important;
}

/* 6. 宠物神兽园 (Pet Garden) - 温暖神兽金 */
.nav-pill-pet {
  background: #fffbeb !important;
  border: 1px solid #fde68a !important;
  color: #b45309 !important;
}
.nav-pill-pet:hover {
  background: #fef3c7 !important;
  border-color: #fcd34d !important;
  color: #92400e !important;
}

/* 7. 手机/竖屏模式切换 (Device Viewport Toggle) - 极简科技灰 */
.nav-pill-device,
.device-toggle-btn {
  background: #f8fafc !important;
  border: 1px solid #cbd5e1 !important;
  color: #475569 !important;
}
.nav-pill-device:hover,
.device-toggle-btn:hover {
  background: #f1f5f9 !important;
  border-color: #94a3b8 !important;
  color: #1e293b !important;
}
body.mode-phone .nav-pill-device,
body.mode-phone .device-toggle-btn {
  background: #f0fdf4 !important;
  border-color: #86efac !important;
  color: #15803d !important;
}

/* ==========================================================================
   移动端与手机竖屏响应式优化 (@media <= 768px 及 body.mode-phone)
   ========================================================================== */
/* ==========================================================================
   移动端与手机竖屏视图极简美化专区 (手机端仅保留【课后作业单】与【课后学情反馈】)
   ========================================================================== */

/* 全局辅助类 */
.tab-full-text { display: inline; }
.tab-mobile-text { display: none; }
.fmt-label-full { display: inline; }
.fmt-label-mobile { display: none; }

.feedback-mode-tabs-wrapper {
  display: flex;
  gap: 0.5rem;
  border-bottom: 2px solid #e2e8f0;
  padding-bottom: 0.75rem;
  margin-bottom: 1.25rem;
}

.mode-tab-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.25rem;
  font-weight: 700;
  font-size: 13.5px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  background: #f1f5f9;
  color: #475569;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.mode-tab-btn.active {
  background: #4f46e5;
  color: #ffffff;
  box-shadow: 0 3px 8px rgba(79, 70, 229, 0.3);
}

/* 手机竖屏模拟容器 (电脑端开启手机模式时) */
body.mode-phone {
  max-width: 520px;
  margin: 0 auto;
  min-height: 100vh;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.16);
  background: #f8fafc;
  border-left: 1px solid #e2e8f0;
  border-right: 1px solid #e2e8f0;
}

/* 统一移动端与模拟手机端规则 */
@media (max-width: 768px) {
  body {
    background: #f8fafc;
  }
}

/* 核心：手机端只保留【课后作业单】与【课后学情反馈】，隐藏其余非必要模块 */
@media (max-width: 768px) {
  .mobile-hidden-tab,
  .desktop-only-btn,
  .desktop-only-hint,
  .desktop-breadcrumb-bar {
    display: none !important;
  }
  .tab-full-text { display: none !important; }
  .tab-mobile-text { display: inline !important; }
  .fmt-label-full { display: none !important; }
  .fmt-label-mobile { display: inline !important; }
}

body.mode-phone .mobile-hidden-tab,
body.mode-phone .desktop-only-btn,
body.mode-phone .desktop-only-hint,
body.mode-phone .desktop-breadcrumb-bar {
  display: none !important;
}
body.mode-phone .tab-full-text { display: none !important; }
body.mode-phone .tab-mobile-text { display: inline !important; }
body.mode-phone .fmt-label-full { display: none !important; }
body.mode-phone .fmt-label-mobile { display: inline !important; }

/* 移动端与手机模式整体结构与头部排版优化 */
@media (max-width: 768px), (body.mode-phone) {
  .app-header {
    padding: 0.65rem 0.75rem !important;
    background: #ffffff !important;
    border-bottom: 1px solid #e2e8f0 !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03) !important;
  }

  .app-header .header-container {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 8px !important;
  }

  .brand-wrapper {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
  }

  .brand-logo-img {
    height: 28px !important;
    max-height: 28px !important;
    width: auto !important;
  }

  /* 快捷药丸导航栏 */
  .top-nav-bar {
    display: flex !important;
    align-items: center !important;
    gap: 6px !important;
    overflow-x: auto !important;
    white-space: nowrap !important;
    scrollbar-width: none !important;
    -webkit-overflow-scrolling: touch !important;
    padding-bottom: 2px !important;
  }
  .top-nav-bar::-webkit-scrollbar {
    display: none !important;
  }

  .top-nav-link {
    padding: 5px 11px !important;
    font-size: 11.5px !important;
    font-weight: 700 !important;
    border-radius: 99px !important;
    flex-shrink: 0 !important;
  }

  .nav-pill-archive {
    background: #eef2ff !important;
    border: 1px solid #c7d2fe !important;
    color: #4338ca !important;
  }

  .nav-pill-student {
    background: #fff3ec !important;
    border: 1px solid #fed7aa !important;
    color: #ea580c !important;
    text-decoration: none !important;
  }

  /* 级别切换：4格等分极简药丸切换器 */
  .level-switcher {
    display: grid !important;
    grid-template-columns: repeat(4, 1fr) !important;
    gap: 5px !important;
    width: 100% !important;
    overflow: visible !important;
    background: #f1f5f9 !important;
    padding: 3px !important;
    border-radius: 10px !important;
  }

  .level-switcher .level-btn {
    padding: 6px 2px !important;
    font-size: 12px !important;
    font-weight: 700 !important;
    border-radius: 7px !important;
    text-align: center !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    border: none !important;
    background: transparent !important;
    color: #475569 !important;
    box-shadow: none !important;
  }

  .level-switcher .level-btn.active {
    background: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%) !important;
    color: #ffffff !important;
    font-weight: 800 !important;
    box-shadow: 0 2px 6px rgba(79, 70, 229, 0.28) !important;
  }

  /* 主体网格单列 */
  .app-body {
    grid-template-columns: 1fr !important;
    padding: 0.6rem !important;
    gap: 0.65rem !important;
  }

  /* 课时选择器展开条 */
  .mobile-nav-toggle-bar {
    display: flex !important;
    align-items: center !important;
    gap: 6px !important;
    margin-bottom: 0.65rem !important;
  }

  .mobile-lesson-btn {
    flex: 1 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    background: linear-gradient(135deg, #f0fdf4 0%, #ecfdf5 100%) !important;
    border: 1px solid #a7f3d0 !important;
    border-radius: 12px !important;
    padding: 9px 12px !important;
    font-size: 13px !important;
    cursor: pointer !important;
    box-shadow: 0 2px 6px rgba(16, 185, 129, 0.08) !important;
  }

  .mobile-lesson-btn:active {
    transform: scale(0.99);
  }

  .mobile-archive-btn {
    flex: 0 0 auto !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    background: #eef2ff !important;
    border: 1px solid #c7d2fe !important;
    color: #4338ca !important;
    font-size: 12px !important;
    font-weight: 800 !important;
    border-radius: 12px !important;
    padding: 9px 12px !important;
    cursor: pointer !important;
    white-space: nowrap !important;
  }

  .mli-arrow {
    font-size: 11px !important;
    background: #d1fae5 !important;
    color: #065f46 !important;
    padding: 3px 8px !important;
    border-radius: 99px !important;
    font-weight: 800 !important;
    white-space: nowrap !important;
  }

  /* 侧边栏折叠面板 (课时选择抽屉) */
  .sidebar {
    max-height: 0 !important;
    overflow: hidden !important;
    transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease !important;
    padding: 0 !important;
    border: none !important;
    background: #ffffff !important;
    border-radius: 14px !important;
  }

  .sidebar.mobile-open {
    max-height: 480px !important;
    overflow-y: auto !important;
    padding: 0.85rem !important;
    border: 1px solid #fed7aa !important;
    margin-bottom: 0.65rem !important;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08) !important;
  }

  /* 手机端专用双 Tab 胶囊切换栏 */
  .module-tabs {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    gap: 6px !important;
    background: #e2e8f0 !important;
    padding: 4px !important;
    border-radius: 12px !important;
    margin-bottom: 0.75rem !important;
    border: none !important;
    overflow: visible !important;
  }

  .module-tabs .tab-btn.mobile-retained-tab {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 6px !important;
    width: 100% !important;
    padding: 10px 8px !important;
    font-size: 13.5px !important;
    font-weight: 800 !important;
    border-radius: 9px !important;
    border: none !important;
    background: transparent !important;
    color: #475569 !important;
    box-shadow: none !important;
    cursor: pointer !important;
  }

  .module-tabs .tab-btn.mobile-retained-tab.active {
    background: #4f46e5 !important;
    color: #ffffff !important;
    box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3) !important;
  }

  /* 卡片容器与内间距美化 */
  .content-card {
    padding: 0.85rem 0.95rem !important;
    border-radius: 14px !important;
    border: 1px solid #e2e8f0 !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03) !important;
  }

  .card-header {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 8px !important;
    padding-bottom: 0.75rem !important;
    border-bottom: 1px solid #f1f5f9 !important;
    margin-bottom: 0.85rem !important;
  }

  .card-title {
    font-size: 0.95rem !important;
    font-weight: 800 !important;
    color: #1e293b !important;
  }

  /* 顶部动作按钮栏 */
  .card-actions-bar {
    width: 100% !important;
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    gap: 6px !important;
  }

  .card-actions-bar .action-btn {
    width: 100% !important;
    padding: 8px 6px !important;
    font-size: 12px !important;
    font-weight: 800 !important;
    text-align: center !important;
    justify-content: center !important;
    border-radius: 8px !important;
  }

  /* 作业单生成器区域 */
  .homework-card-wrapper {
    width: 100% !important;
    gap: 0.75rem !important;
  }

  #homework-customizer-container {
    width: 100% !important;
    max-width: 100% !important;
  }

  .poster-card {
    width: 100% !important;
    max-width: 100% !important;
    border-radius: 14px !important;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06) !important;
    font-size: 13px !important;
  }

  .poster-header {
    padding: 1rem 1.15rem !important;
  }

  .poster-body {
    padding: 1rem 1.15rem !important;
  }

  .poster-section {
    padding: 0.85rem 1rem !important;
    border-radius: 10px !important;
  }

  /* 课后反馈模式切换栏 (班级群发 vs 个人学员) */
  .feedback-mode-tabs-wrapper {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    gap: 6px !important;
    background: #f1f5f9 !important;
    padding: 4px !important;
    border-radius: 12px !important;
    border: none !important;
    margin-bottom: 0.85rem !important;
  }

  .mode-tab-btn {
    padding: 8px 4px !important;
    font-size: 12.5px !important;
    justify-content: center !important;
    border-radius: 8px !important;
    text-align: center !important;
  }

  /* 班级群发文本框 */
  #class-feedback-textarea {
    min-height: 280px !important;
    font-size: 13.5px !important;
    line-height: 1.6 !important;
    padding: 0.75rem !important;
    border-radius: 10px !important;
  }

  /* 个人学员反馈两列变单列 */
  .feedback-editor-grid {
    grid-template-columns: 1fr !important;
    gap: 0.85rem !important;
  }

  .roster-card {
    padding: 0.85rem !important;
    border-radius: 12px !important;
  }

  .class-student-bar {
    flex-direction: column !important;
    gap: 8px !important;
  }

  /* 弹窗在移动端的优化 */
  .modal-content {
    width: 95% !important;
    max-width: 95% !important;
    max-height: 90vh !important;
    padding: 1rem !important;
    border-radius: 16px !important;
  }

  .ptm-dialog {
    max-width: 95% !important;
  }
}