/* =================== 学路 - 全局样式（阳光秋天主题 2026-05-30） =================== */

:root {
  --primary: #E65100;
  --primary-light: rgba(230,81,0,0.1);
  --primary-dark: #BF360C;
  --success: #F9A825;
  --success-light: rgba(249,168,37,0.12);
  --warning: #FF8F00;
  --warning-light: rgba(255,143,0,0.12);
  --danger: #D32F2F;
  --danger-light: rgba(211,47,47,0.1);
  --bg: #FFF8E7;
  --card: rgba(255,255,255,0.85);
  --text: #3E2723;
  --text-secondary: #5D4037;
  --text-muted: #8D6E63;
  --border: rgba(230,81,0,0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.12);
  --transition: all 0.25s ease;
  --nav-height: 60px;
  --max-width: 768px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height:1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

/* 秋天阳光粒子 */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(2px 2px at 8% 20%, rgba(255,193,7,0.5), transparent),
    radial-gradient(1.5px 1.5px at 22% 55%, rgba(255,193,7,0.35), transparent),
    radial-gradient(2.5px 2.5px at 38% 15%, rgba(255,213,79,0.45), transparent),
    radial-gradient(1px 1px at 52% 70%, rgba(255,193,7,0.3), transparent),
    radial-gradient(2px 2px at 68% 25%, rgba(255,213,79,0.4), transparent),
    radial-gradient(1.5px 1.5px at 82% 60%, rgba(255,193,7,0.35), transparent),
    radial-gradient(2px 2px at 92% 35%, rgba(255,213,79,0.4), transparent),
    radial-gradient(1px 1px at 12% 80%, rgba(255,193,7,0.25), transparent),
    radial-gradient(2px 2px at 32% 8%, rgba(230,81,0,0.3), transparent),
    radial-gradient(1.5px 1.5px at 58% 40%, rgba(230,81,0,0.25), transparent),
    radial-gradient(2px 2px at 75% 12%, rgba(216,67,21,0.3), transparent),
    radial-gradient(1px 1px at 18% 35%, rgba(230,81,0,0.2), transparent),
    radial-gradient(2.5px 2.5px at 88% 75%, rgba(230,81,0,0.25), transparent),
    radial-gradient(1px 1px at 45% 88%, rgba(255,248,225,0.4), transparent),
    radial-gradient(1.5px 1.5px at 5% 48%, rgba(255,248,225,0.35), transparent),
    radial-gradient(1px 1px at 28% 92%, rgba(255,248,225,0.3), transparent),
    radial-gradient(2px 2px at 65% 82%, rgba(255,248,225,0.35), transparent);
  background-size: 200% 200%;
  animation: autumnFloat 90s ease-in-out infinite;
}

@keyframes autumnFloat {
  0% { background-position: 0% 100%; }
  50% { background-position: 100% 0%; }
  100% { background-position: 0% 100%; }
}

/* 确保内容在背景之上 */
.app-container, .nav-bar, .modal-overlay, .bottom-nav {
  position: relative;
  z-index: 1;
}

/* =================== 顶部导航 =================== */
.nav-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,248,231,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom:1px solid rgba(230,81,0,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  height: var(--nav-height);
  padding:0 16px;
  box-shadow: 0 1px 0 rgba(230,81,0,0.08), 0 4px 20px rgba(0,0,0,0.06);
}

.nav-brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  margin-right: auto;
  letter-spacing: 1px;
}

.nav-tabs {
  display: flex;
  gap: 4px;
}

.nav-tab {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  white-space: nowrap;
}

.nav-tab:hover { background: rgba(230,81,0,0.08); color: var(--primary); }
.nav-tab.active { background: var(--primary); color: #FFFFFF; }

/* =================== 主容器 =================== */
.app-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px;
  min-height: calc(100vh - var(--nav-height) - 60px);
}

.page { display: none; }
.page.active { display: block; animation: fadeIn 0.3s ease; }

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

/* =================== 卡片 =================== */
.card {
  background: var(--card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
}

.card-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

/* =================== 按钮 =================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary { background: var(--primary); color: #FFFFFF; font-weight: 600; }
.btn-primary:hover { background: #FF9800; box-shadow: 0 0 20px rgba(230,81,0,0.3); }
.btn-success { background: var(--success); color: #3E2723; }
.btn-success:hover { background: #FFC107; }
.btn-warning { background: var(--warning); color: #3E2723; }
.btn-warning:hover { background: #FFB300; }
.btn-outline {
  background: transparent;
  border: 1.5px solid var(--primary);
  color: var(--primary);
}
.btn-outline:hover { background: var(--primary-light); }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #B71C1C; }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* =================== 表单 =================== */
.form-group { margin-bottom: 16px; }

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}

.form-input, .form-select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  transition: var(--transition);
  background: rgba(0,0,0,0.03);
  color: var(--text);
}

.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(230,81,0,0.15), 0 0 12px rgba(230,81,0,0.1);
}

.form-input::placeholder { color: var(--text-muted); }
.form-select { color-scheme: light; }
.form-select option { background: #FFF8E7; color: #3E2723; }

/* =================== 单元列表 =================== */
.unit-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.unit-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
}

.unit-item:hover {
  border-color: var(--primary);
  box-shadow: 0 0 16px rgba(230,81,0,0.1), var(--shadow);
  transform: translateY(-1px);
}

.unit-info { flex: 1; min-width: 0; }

.unit-name {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 4px;
}

.unit-meta {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.unit-status {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  margin-left: 12px;
}

.status-badge {
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.status-mastered {
  background: rgba(76,175,80,0.12);
  color: #4CAF50;
}

.status-learning {
  background: rgba(255,152,0,0.12);
  color: #FF9800;
}

.status-unlearned {
  background: rgba(0,0,0,0.04);
  color: var(--text-muted);
}

/* =================== 知识点 =================== */
.knowledge-points {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}

.kp-tag {
  padding: 6px 12px;
  background: rgba(230,81,0,0.08);
  border-radius: 16px;
  font-size: 13px;
  color: var(--primary);
}

/* =================== 内容预览 =================== */
.chapter-preview {
  margin: 16px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.chapter-preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: rgba(0,0,0,0.02);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  user-select: none;
  transition: var(--transition);
}
.chapter-preview-header:hover { background: rgba(0,0,0,0.04); }

.chapter-toggle-icon {
  font-size: 10px;
  transition: transform 0.25s ease;
  color: var(--text-secondary);
}
.chapter-preview.collapsed .chapter-toggle-icon { transform: rotate(-90deg); }

.chapter-preview-body {
  padding: 12px 16px 16px;
  transition: max-height 0.3s ease;
}
.chapter-preview.collapsed .chapter-preview-body { display: none; }

.chapter-summary {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--border);
}

.chapter-sections {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chapter-section {
  padding-left: 2px;
}

.chapter-section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 6px;
}

.chapter-section-points {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chapter-section-points li {
  font-size: 13px;
  color: var(--text-secondary);
  padding-left: 14px;
  position: relative;
  line-height: 1.7;
}

.chapter-section-points li::before {
  content: '·';
  position: absolute;
  left: 2px;
  font-weight: bold;
  color: var(--primary);
}

/* =================== 答题界面 =================== */
.question-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 12px;
  border: 1px solid var(--border);
}

.question-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.question-number {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
}

.question-type-badge {
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 500;
}

.question-text {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 12px;
  white-space: pre-wrap;
}

.answer-input {
  width: 100%;
  min-height: 80px;
  padding: 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
  line-height: 1.6;
  background: rgba(0,0,0,0.03);
  color: var(--text);
}

.answer-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(230,81,0,0.15);
}

.answer-feedback {
  margin-top: 8px;
  padding: 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  display: none;
}

.answer-feedback.show { display: block; }
.answer-feedback.correct { background: var(--success-light); color: var(--success); }
.answer-feedback.wrong { background: var(--danger-light); color: var(--danger); }

/* =================== 进度 =================== */
.progress-ring {
  position: relative;
  width: 140px;
  height: 140px;
  margin: 0 auto 20px;
}

.progress-ring svg { transform: rotate(-90deg); }

.progress-ring .bg-circle {
  fill: none;
  stroke: var(--border);
  stroke-width: 10;
}

.progress-ring .fg-circle {
  fill: none;
  stroke: var(--primary);
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.8s ease;
}

.progress-ring .percent-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.progress-ring .percent-num {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
}

.progress-ring .percent-label {
  font-size: 12px;
  color: var(--text-secondary);
}

.subject-progress {
  margin-top: 16px;
}

.subject-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.subject-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.subject-bar .bar-label {
  width: 40px;
  font-size: 14px;
  font-weight: 500;
  flex-shrink: 0;
}

.subject-bar .bar-track {
  flex: 1;
  height: 10px;
  background: rgba(0,0,0,0.06);
  border-radius: 5px;
  overflow: hidden;
}

.subject-bar .bar-fill {
  height: 100%;
  border-radius: 5px;
  transition: width 0.5s ease;
}

.subject-bar .bar-percent {
  width: 40px;
  font-size: 13px;
  font-weight: 500;
  text-align: right;
  flex-shrink: 0;
}

/* =================== 背诵 =================== */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: var(--card);
}

.upload-zone:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.upload-zone .upload-icon {
  font-size: 48px;
  margin-bottom: 12px;
}

.upload-zone p {
  color: var(--text-secondary);
  font-size: 14px;
}

.extracted-text {
  background: rgba(0,0,0,0.03);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-size: 14px;
  line-height: 1.8;
  max-height: 300px;
  overflow-y: auto;
  white-space: pre-wrap;
  margin: 12px 0;
}

.recite-question {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 12px;
}

.recite-type-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  margin-bottom: 8px;
}

.type-continuation { background: #E3F2FD; color: #1565C0; }
.type-fill { background: #FFEBEE; color: #C62828; }
.type-understanding { background: #E8F5E9; color: #2E7D32; }

/* =================== 设置 =================== */
.settings-section {
  margin-bottom: 24px;
}

.settings-section h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* =================== 报告 =================== */
.stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

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

.stat-num {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-secondary);
}

.timeline {
  border-left: 2px solid var(--border);
  margin-left: 8px;
  padding-left: 20px;
}

.timeline-item {
  position: relative;
  margin-bottom: 16px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -27px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid var(--card);
}

.timeline-date {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 2px;
}

.timeline-content {
  font-size: 14px;
}

/* =================== 弹窗 =================== */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.show { display: flex; }

.modal {
  background: rgba(255,248,231,0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 500px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 0 40px rgba(230,81,0,0.08), var(--shadow-lg);
  border: 1px solid rgba(230,81,0,0.12);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.06);
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.modal-close:hover { background: rgba(0,0,0,0.1); color: var(--text); }

.modal-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 20px;
}

/* =================== 年级筛选 =================== */
.grade-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.grade-chip {
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text-secondary);
}

.grade-chip:hover { border-color: var(--primary); color: var(--primary); background: rgba(230,81,0,0.06); }
.grade-chip.active { background: var(--primary); color: #FFFFFF; border-color: var(--primary); }

/* =================== 学期切换 =================== */
.semester-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 12px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}

.semester-tab {
  flex: 1;
  padding: 8px 16px;
  text-align: center;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  background: var(--card);
  border: none;
  color: var(--text-secondary);
}

.semester-tab:first-child { border-right: 1px solid var(--border); }
.semester-tab.active { background: var(--primary); color: #FFFFFF; }

/* =================== Toast =================== */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 24px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  z-index: 300;
  animation: toastIn 0.3s ease;
  white-space: nowrap;
  box-shadow: var(--shadow-lg);
}

.toast-success { background: var(--success); color: #3E2723; }
.toast-error { background: var(--danger); color: white; }
.toast-info { background: var(--primary); color: white; }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(20px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* =================== 加载 =================== */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid rgba(0,0,0,0.1);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-text {
  margin-left: 12px;
  font-size: 14px;
  color: var(--text-secondary);
}

/* =================== 空状态 =================== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
}

.empty-icon { font-size: 48px; margin-bottom: 12px; }
.empty-text { font-size: 15px; color: var(--text-secondary); }

/* =================== 响应式 =================== */
@media (max-width: 600px) {
  .app-container { padding: 12px; }

  .nav-tab { padding: 6px 10px; font-size: 13px; }

  .stat-cards { grid-template-columns: repeat(2, 1fr); }

  .card { padding: 14px; }

  .question-card { padding: 14px; }

  .progress-ring { width: 110px; height: 110px; }
  .progress-ring .percent-num { font-size: 26px; }

  .grade-filter { gap: 4px; }
  .grade-chip { padding: 5px 10px; font-size: 12px; }
}

/* =================== 底部导航（移动端） =================== */
@media (max-width: 600px) {
  .bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(255,248,231,0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid rgba(230,81,0,0.12);
    z-index: 100;
    box-shadow: 0 -4px 20px rgba(0,0,0,0.08);
  }

  .bottom-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px 4px;
    cursor: pointer;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 11px;
    gap: 2px;
    transition: var(--transition);
  }

  .bottom-nav-item .bn-icon { font-size: 20px; }
  .bottom-nav-item.active { color: var(--primary); }

  .app-container { padding-bottom: 80px; }
}

/* =================== 教材原文预览入口按钮 =================== */
.material-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 12px 16px;
  margin-bottom: 16px;
  background: rgba(255,152,0,0.08);
  border: 1px solid rgba(255,152,0,0.25);
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  font-size: 14px;
  font-weight: 500;
  color: #E65100;
}

.material-btn:hover {
  background: rgba(255,152,0,0.14);
  transform: translateY(-1px);
  box-shadow: 0 3px 10px rgba(255,152,0,0.12);
}

.material-btn .material-btn-icon { font-size: 20px; }

.material-btn .material-btn-text {
  flex: 1;
  text-align: left;
}

.material-btn .material-btn-text strong {
  display: block;
  font-size: 14px;
  color: #E65100;
}

.material-btn .material-btn-text span {
  display: block;
  font-size: 12px;
  color: #BF360C;
  margin-top: 1px;
}

.material-btn .material-btn-arrow {
  font-size: 16px;
  color: #BF360C;
}

/* =================== 教材预览全屏弹窗 =================== */
.material-modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.85);
  z-index: 500;
  flex-direction: column;
}

.material-modal-overlay.show { display: flex; }

.material-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: #FFF8E7;
  color: #3E2723;
  flex-shrink: 0;
}

.material-modal-title {
  font-size: 15px;
  font-weight: 600;
  flex: 1;
  margin: 0 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.material-modal-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.08);
  color: #3E2723;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  flex-shrink: 0;
}

.material-modal-close:hover { background: rgba(0,0,0,0.15); }

.material-modal-body {
  flex: 1;
  overflow: hidden;
  position: relative;
  background: #F5F5F5;
}

/* PDF 预览 */
.material-pdf-viewer {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* 图片预览 */
.material-img-viewer {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.material-img-slider {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.material-img-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
  overflow: auto;
}

.material-img-slide.active { opacity: 1; }

.material-img-slide img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 4px;
}

.material-img-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 10px 16px;
  background: #FFF8E7;
  flex-shrink: 0;
}

.material-img-nav-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.15);
  background: rgba(255,255,255,0.8);
  color: #3E2723;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.material-img-nav-btn:hover:not(:disabled) { background: rgba(255,255,255,1); }
.material-img-nav-btn:disabled { opacity: 0.3; cursor: default; }

.material-img-counter {
  color: #5D4037;
  font-size: 14px;
  min-width: 60px;
  text-align: center;
}

/* 无素材占位 */
.material-empty {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: rgba(0,0,0,0.4);
  gap: 12px;
}

.material-empty-icon { font-size: 48px; }
.material-empty-text { font-size: 14px; }
.material-empty-hint { font-size: 12px; color: rgba(0,0,0,0.25); }

/* =================== 用户认证 =================== */

/* 导航栏登录入口 */
.nav-auth {
  margin-left: 12px;
  display: flex;
  align-items: center;
}

.auth-entry-btn {
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: 1.5px solid var(--primary);
  background: var(--primary);
  color: #FFFFFF;
  transition: var(--transition);
  white-space: nowrap;
}

.auth-entry-btn:hover {
  background: #FF9800;
  border-color: #FF9800;
  box-shadow: 0 0 16px rgba(230,81,0,0.3);
}

.auth-user-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.7);
}

.auth-user-btn:hover {
  background: rgba(230,81,0,0.08);
  border-color: var(--primary);
}

.auth-avatar {
  font-size: 20px;
  line-height: 1;
}

.auth-username {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  max-width: 80px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 登录弹窗 */
.auth-modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 200;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

.auth-modal-overlay.show {
  display: flex;
}

.auth-modal {
  background: rgba(255,248,231,0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 16px;
  width: 92%;
  max-width: 380px;
  padding: 32px 28px 24px;
  position: relative;
  box-shadow: 0 0 40px rgba(230,81,0,0.08), var(--shadow-lg);
  border: 1px solid rgba(230,81,0,0.12);
  animation: slideUp 0.25s ease;
}

.auth-modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  width: 32px;
  height: 32px;
  border: none;
  background: rgba(0,0,0,0.06);
  font-size: 18px;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.auth-modal-close:hover {
  background: rgba(0,0,0,0.1);
  color: var(--text);
}

/* 登录/注册切换标签 */
.auth-tabs {
  display: flex;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--border);
}

.auth-tab {
  flex: 1;
  padding: 10px 0;
  border: none;
  background: transparent;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.auth-tab.active {
  color: var(--primary);
}

.auth-tab.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

/* 认证表单 */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.auth-form .form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.auth-form .form-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}

.auth-form .form-input {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  outline: none;
  transition: var(--transition);
  background: rgba(0,0,0,0.03);
}

.auth-form .form-input:focus {
  border-color: var(--primary);
  background: var(--card);
  box-shadow: 0 0 0 3px rgba(230,81,0,0.12);
}

.auth-submit-btn {
  margin-top: 4px;
  padding: 11px 0;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  letter-spacing: 2px;
}

.auth-switch {
  text-align: center;
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.auth-switch a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.auth-switch a:hover {
  text-decoration: underline;
}

/* 错误提示 */
.auth-error {
  background: var(--danger-light);
  color: var(--danger);
  font-size: 13px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  border: 1px solid rgba(211,47,47,0.2);
}

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

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* =================== 用户下拉菜单 =================== */
.user-menu-dropdown {
  position: fixed;
  z-index: 250;
  background: rgba(255,248,231,0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(230,81,0,0.18);
  border-radius: var(--radius);
  padding: 16px;
  min-width: 220px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.12), 0 0 20px rgba(230,81,0,0.06);
  animation: slideUp 0.2s ease;
}

.um-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 4px;
}

.um-avatar {
  font-size: 36px;
  line-height: 1;
  flex-shrink: 0;
}

.um-user-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.um-nickname {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.um-username {
  font-size: 12px;
  color: var(--text-muted);
}

.um-divider {
  height: 1px;
  background: var(--border);
  margin: 12px 0;
}

.um-sub-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-secondary);
}

.um-sub-badge {
  padding: 2px 10px;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 500;
}

.um-sub-subscribed {
  background: var(--success-light);
  color: var(--success);
}

.um-sub-trial {
  background: var(--warning-light);
  color: var(--warning);
}

.um-sub-expired {
  background: var(--danger-light);
  color: var(--danger);
}

.um-sub-unsubscribed {
  background: rgba(0,0,0,0.04);
  color: var(--text-muted);
}

.um-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 10px 12px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.um-item:hover {
  background: rgba(0,0,0,0.04);
}

.um-logout:hover {
  background: var(--danger-light);
  color: var(--danger);
}

/* =================== 倒计时 =================== */
.cd-card {
  background: linear-gradient(135deg, #FFF8E7 0%, #FFE0B2 40%, #FFF8E7 100%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius);
  padding: 28px 20px 24px;
  margin-bottom: 16px;
  text-align: center;
  color: #3E2723;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(230,81,0,0.15);
  box-shadow:
    0 0 40px rgba(230,81,0,0.06),
    0 0 80px rgba(216,67,21,0.03),
    inset 0 0 60px rgba(230,81,0,0.03);
}

/* 角标装饰 */
.cd-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background:
    linear-gradient(to right, rgba(230,81,0,0.2) 0%, transparent 15%, transparent 85%, rgba(230,81,0,0.2) 100%) top / 100% 1px no-repeat,
    linear-gradient(to right, rgba(230,81,0,0.2) 0%, transparent 15%, transparent 85%, rgba(230,81,0,0.2) 100%) bottom / 100% 1px no-repeat,
    linear-gradient(to bottom, rgba(230,81,0,0.2) 0%, transparent 15%, transparent 85%, rgba(230,81,0,0.2) 100%) left / 1px 100% no-repeat,
    linear-gradient(to bottom, rgba(230,81,0,0.2) 0%, transparent 15%, transparent 85%, rgba(230,81,0,0.2) 100%) right / 1px 100% no-repeat;
  pointer-events: none;
}

/* 扫描线 */
.cd-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(230,81,0,0.015) 2px,
    rgba(230,81,0,0.015) 4px
  );
  pointer-events: none;
}

.cd-title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 6px;
  position: relative;
  z-index: 1;
}

.cd-title {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 2px;
  opacity: 0.7;
  text-transform: uppercase;
}

.cd-edit-btn {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid rgba(230,81,0,0.3);
  background: rgba(230,81,0,0.08);
  color: rgba(230,81,0,0.8);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  flex-shrink: 0;
  line-height: 1;
  position: relative;
  z-index: 1;
}

.cd-edit-btn:hover {
  background: rgba(230,81,0,0.18);
  border-color: rgba(230,81,0,0.5);
  box-shadow: 0 0 12px rgba(230,81,0,0.25);
}

.cd-target-date {
  font-size: 12px;
  opacity: 0.5;
  margin-bottom: 20px;
  letter-spacing: 1px;
  position: relative;
  z-index: 1;
}

.cd-digits {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: relative;
  z-index: 1;
}

.cd-digit-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

/* 超大数字 */
.cd-num {
  font-size: clamp(80px, 25vw, 180px);
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  font-family: 'SF Mono', 'JetBrains Mono', 'Consolas', 'Menlo', 'Courier New', monospace;
  line-height: 1;
  text-align: center;
  color: #E65100;
  text-shadow:
    0 0 10px rgba(230,81,0,0.3),
    0 0 30px rgba(230,81,0,0.2),
    0 0 60px rgba(230,81,0,0.1),
    0 0 100px rgba(230,81,0,0.06),
    0 4px 8px rgba(0,0,0,0.08);
  animation: cdGlowPulse 4s ease-in-out infinite;
}

@keyframes cdGlowPulse {
  0%, 100% {
    text-shadow:
      0 0 10px rgba(230,81,0,0.4),
      0 0 30px rgba(230,81,0,0.25),
      0 0 60px rgba(230,81,0,0.12),
      0 0 100px rgba(230,81,0,0.08);
  }
  50% {
    text-shadow:
      0 0 14px rgba(230,81,0,0.5),
      0 0 40px rgba(230,81,0,0.3),
      0 0 80px rgba(230,81,0,0.18),
      0 0 120px rgba(230,81,0,0.12);
  }
}

.cd-label {
  font-size: clamp(18px, 5vw, 28px);
  font-weight: 600;
  letter-spacing: 3px;
  color: rgba(230,81,0,0.5);
  text-shadow:
    0 0 8px rgba(230,81,0,0.25),
    0 0 20px rgba(230,81,0,0.08);
}

.cd-expired {
  font-size: clamp(28px, 8vw, 48px);
  font-weight: 700;
  opacity: 0.8;
  padding: 12px 0;
  position: relative;
  z-index: 1;
  text-shadow: 0 0 20px rgba(76,175,80,0.3);
}

/* 倒计时响应式 */
@media (max-width: 600px) {
  .cd-card {
    padding: 24px 12px 20px;
    border-radius: 0;
    margin-left: -12px;
    margin-right: -12px;
    border-left: none;
    border-right: none;
  }

  .cd-num {
    font-size: clamp(72px, 28vw, 140px);
  }

  .cd-label {
    font-size: clamp(16px, 5vw, 24px);
  }
}

/* =================== 主页仪表盘 =================== */

/* 顶部栏 */
.home-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,248,231,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(230,81,0,0.15);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 20px;
}

.home-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.home-logo-img {
  width: 28px;
  height: 28px;
}

.home-logo-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 1px;
}

.home-auth {
  display: flex;
  align-items: center;
}

/* 主体 */
.home-main {
  max-width: 700px;
  margin: 0 auto;
  padding: 24px 20px 100px;
  position: relative;
  z-index: 1;
}

/* 倒计时区域 */
.countdown-section {
  margin-bottom: 32px;
}

/* PWA 安装按钮 */
.pwa-install-btn {
  display: block;
  width: 100%;
  max-width: 500px;
  margin: 12px auto 0;
  padding: 12px 20px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 12px rgba(102, 126, 234, 0.3);
}

.pwa-install-btn:active {
  transform: scale(0.97);
  box-shadow: 0 1px 6px rgba(102, 126, 234, 0.2);
}

@media (max-width: 600px) {
  .pwa-install-btn {
    border-radius: 8px;
    font-size: 14px;
    padding: 10px 16px;
  }
}

/* 工具区域 */
.tools-section {
  margin-top: 8px;
}

.tools-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tools-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--border), transparent);
}

/* 工具网格 */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.tool-card {
  background: var(--card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1.5px solid var(--border);
  border-radius: 14px;
  padding: 0 12px 14px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--tool-color, var(--primary));
  box-shadow: 0 8px 24px rgba(0,0,0,0.1), 0 0 24px rgba(230,81,0,0.06);
}

.tool-card:active {
  transform: scale(0.97);
}

/* 顶栏色条 — 始终可见 */
.tool-accent-bar {
  height: 3px;
  background: var(--tool-color, var(--primary));
  margin: 0 -12px;
  border-radius: 0 0 2px 2px;
}

/* 禁用态 */
.tool-card-disabled {
  cursor: default;
  opacity: 0.5;
}

.tool-card-disabled:hover {
  transform: none;
  border-color: var(--border);
  box-shadow: none;
}

.tool-card-disabled .tool-accent-bar {
  opacity: 0.3;
}

/* 免费标签 */
.tool-badge-free {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 10px;
  background: rgba(76,175,80,0.15);
  color: #4CAF50;
  padding: 2px 7px;
  border-radius: 8px;
  font-weight: 500;
  line-height: 1.4;
}

/* 即将标签 */
.tool-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 10px;
  background: rgba(0,0,0,0.06);
  color: var(--text-muted);
  padding: 2px 7px;
  border-radius: 8px;
  font-weight: 500;
}

/* 图标区 */
.tool-icon-wrap {
  padding-top: 14px;
  margin-bottom: 10px;
}

.tool-icon-bg {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--tool-color, var(--primary)) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--tool-color, var(--primary)) 22%, transparent);
  transition: all 0.2s ease;
}

.tool-card:hover .tool-icon-bg {
  background: color-mix(in srgb, var(--tool-color, var(--primary)) 18%, transparent);
  border-color: color-mix(in srgb, var(--tool-color, var(--primary)) 40%, transparent);
  box-shadow: 0 0 14px color-mix(in srgb, var(--tool-color, var(--primary)) 20%, transparent);
}

.tool-icon {
  font-size: 24px;
  line-height: 1;
  display: block;
}

/* 工具名 */
.tool-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

/* 价值主张 — 动词流 */
.tool-value-prop {
  font-size: 11px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 10px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 分割线 */
.tool-divider {
  height: 0.5px;
  background: var(--border);
  margin: 0 2px 8px;
}

/* 数据位 */
.tool-stat {
  font-size: 11px;
  color: var(--tool-color, var(--primary));
  margin-bottom: 6px;
  min-height: 16px;
  transition: all 0.2s ease;
}

/* 进入箭头 */
.tool-enter {
  font-size: 12px;
  color: var(--text-muted);
  transition: all 0.2s ease;
  display: inline-block;
}

.tool-card:hover .tool-enter {
  color: var(--tool-color, var(--primary));
  transform: translateX(4px);
}

/* 底部导航 */
.home-bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255,248,231,0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid rgba(230,81,0,0.12);
  display: flex;
  justify-content: center;
  gap: 0;
  z-index: 100;
  padding: 8px 0 env(safe-area-inset-bottom, 8px);
}

.home-bn-item {
  flex: 1;
  max-width: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 6px 8px;
  font-size: 11px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 10px;
  transition: all 0.2s ease;
}

.home-bn-item:hover {
  color: var(--primary);
  background: rgba(230,81,0,0.06);
}

.home-bn-icon {
  font-size: 20px;
  line-height: 1;
}

/* Toast 容器 */
.toast-container {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  pointer-events: none;
}

/* =================== 主页响应式 =================== */

@media (max-width: 600px) {
  .home-main {
    padding: 16px 12px 100px;
  }

  .tool-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .tool-card {
    padding: 16px 8px 12px;
  }

  .tool-icon {
    font-size: 30px;
  }

  .tool-name {
    font-size: 12px;
  }

  .tool-desc {
    font-size: 10px;
  }

  .home-bottom-nav {
    padding: 6px 0 env(safe-area-inset-bottom, 6px);
  }
}

@media (max-width: 360px) {
  .tool-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
  }

  .tool-card {
    padding: 12px 6px 10px;
  }

  .tool-icon {
    font-size: 26px;
  }
}

/* 平板及以上 */
@media (min-width: 768px) {
  .tool-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
  }
}

@media (min-width: 1024px) {
  .tool-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
  }
}

/* =================== 课程推广卡片 =================== */
.course-promo-section {
  margin-top: 32px;
  padding-bottom: 16px;
}

.course-promo-card {
  background: linear-gradient(135deg, rgba(230,81,0,0.06) 0%, rgba(230,81,0,0.1) 50%, rgba(230,81,0,0.04) 100%);
  border: 1.5px solid rgba(230,81,0,0.18);
  border-radius: 16px;
  padding: 28px 24px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.course-promo-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 20%, rgba(230,81,0,0.04) 0%, transparent 60%),
            radial-gradient(ellipse at 70% 80%, rgba(230,81,0,0.04) 0%, transparent 60%);
  pointer-events: none;
}

.course-promo-card:hover {
  transform: translateY(-4px);
  border-color: rgba(230,81,0,0.35);
  box-shadow: 0 8px 32px rgba(230,81,0,0.1), 0 0 60px rgba(230,81,0,0.05);
}

.course-promo-badge {
  display: inline-block;
  padding: 4px 14px;
  background: linear-gradient(135deg, var(--primary), #D84315);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.course-promo-icon {
  font-size: 48px;
  margin-bottom: 10px;
  filter: drop-shadow(0 0 12px rgba(230,81,0,0.25));
}

.course-promo-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.course-promo-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.course-promo-features {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 22px;
}

.cpf-item {
  padding: 6px 14px;
  background: rgba(255,255,255,0.7);
  border: 1px solid rgba(0,0,0,0.08);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.course-promo-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 32px;
  background: linear-gradient(135deg, var(--primary), #D84315);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  border: none;
  border-radius: 28px;
  cursor: pointer;
  transition: all 0.25s ease;
  letter-spacing: 1px;
}

.course-promo-cta:hover {
  box-shadow: 0 4px 20px rgba(230,81,0,0.3), 0 0 40px rgba(230,81,0,0.15);
  transform: scale(1.03);
}

.course-promo-cta.unlocked {
  background: linear-gradient(135deg, var(--success), #388E3C);
}

/* 底部导航锁标 */
.home-bn-item {
  position: relative;
}

.home-bn-lock {
  position: absolute;
  top: 2px;
  right: 12px;
  font-size: 10px;
  opacity: 0.8;
  filter: grayscale(0.3);
}

.home-bn-lock.hidden {
  display: none;
}

/* 课程推广响应式 */
@media (max-width: 600px) {
  .course-promo-card {
    padding: 22px 16px 20px;
  }

  .course-promo-icon {
    font-size: 40px;
  }

  .course-promo-title {
    font-size: 18px;
  }

  .course-promo-desc {
    font-size: 13px;
  }

  .course-promo-features {
    gap: 6px;
  }

  .cpf-item {
    font-size: 11px;
    padding: 4px 10px;
  }

  .course-promo-cta {
    padding: 10px 28px;
    font-size: 14px;
  }
}

/* ICP备案 */
.site-footer {
  text-align: center;
  padding: 16px 12px 100px;
  font-size: 12px;
  color: #999;
  background: #f8f9fb;
}
.site-footer a {
  color: #999;
  text-decoration: none;
}
.site-footer a:hover {
  color: #667eea;
}

/* PWA Toast 动画 */
@keyframes pwaToastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(20px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}