/* =============================================
   教案管理系统 - 样式表
   设计理念：温暖、亲切、有人情味
   ============================================= */

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

:root {
  --bg: #f7f5f2;
  --surface: #ffffff;
  --border: #e6e0d8;
  --border-light: #f0ece6;

  --text: #2a2724;
  --text-secondary: #7a736e;
  --text-muted: #a8a09a;
  --text-placeholder: #c5bdb6;

  --accent: #4a6cf7;
  --accent-hover: #3b5de7;
  --accent-light: #eef1ff;

  --success: #16a34a;
  --success-light: #f0fdf4;
  --danger: #e11d48;
  --danger-light: #fff1f2;

  --radius-sm: 6px;
  --radius: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 3px rgba(42, 39, 36, 0.06);
  --shadow: 0 2px 8px rgba(42, 39, 36, 0.07);
  --shadow-md: 0 4px 16px rgba(42, 39, 36, 0.08);
  --shadow-lg: 0 8px 32px rgba(42, 39, 36, 0.1);

  --font: -apple-system, BlinkMacSystemFont, "SF Pro", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;

  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

html { font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }

h1, h2, h3, h4 { font-weight: 600; line-height: 1.35; color: var(--text); }

/* ====== 按钮 ====== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 18px;
  font-size: 14px; font-weight: 500; font-family: var(--font);
  line-height: 1.4;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); color: var(--text);
  cursor: pointer; white-space: nowrap;
  transition: all var(--transition);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}
.btn:hover {
  background: #faf8f6;
  border-color: #d6cfc6;
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.btn:active {
  background: #f0ece6;
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-sm { padding: 5px 12px; font-size: 13px; border-radius: 6px; }
.btn-lg { padding: 11px 24px; font-size: 15px; border-radius: 10px; }

.btn-primary {
  background: var(--accent); color: #fff;
  border-color: var(--accent);
  box-shadow: 0 2px 8px rgba(74, 108, 247, 0.25);
}
.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 4px 14px rgba(74, 108, 247, 0.3);
  transform: translateY(-1px);
}

.btn-secondary {
  background: #f0eeeb; color: var(--text);
  border-color: #e6e0d8;
}
.btn-secondary:hover {
  background: #e8e2da;
  border-color: #d6cfc6;
}

.btn-danger {
  background: var(--danger); color: #fff;
  border-color: var(--danger);
  box-shadow: 0 2px 8px rgba(225, 29, 72, 0.2);
}
.btn-danger:hover {
  background: #be123c;
  border-color: #be123c;
  box-shadow: 0 4px 14px rgba(225, 29, 72, 0.25);
}

.btn-outline {
  background: transparent; color: var(--text-secondary);
  border-color: var(--border); box-shadow: none;
}
.btn-outline:hover {
  background: var(--surface);
  color: var(--text);
  border-color: #d6cfc6;
  box-shadow: var(--shadow-sm);
}

.btn:disabled { opacity: 0.5; pointer-events: none; }

/* ====== 提示条 ====== */
.alert {
  padding: 12px 16px; border-radius: var(--radius);
  margin-bottom: 16px; font-size: 14px; line-height: 1.5;
  display: flex; align-items: center; gap: 8px;
}
.alert-error { background: var(--danger-light); color: #9f1239; border: 1px solid #fecdd3; }
.alert-success { background: var(--success-light); color: #166534; border: 1px solid #bbf7d0; }

/* ====== 表单 ====== */
.form-group { margin-bottom: 22px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 6px; color: var(--text); }
.required { color: var(--danger); }
.form-help { font-size: 13px; color: var(--text-muted); margin-bottom: 8px; line-height: 1.5; }

.form-input {
  width: 100%; padding: 10px 14px;
  border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 14px; font-family: var(--font);
  color: var(--text); background: var(--surface);
  outline: none; transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}
.form-input::placeholder { color: var(--text-placeholder); }
.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(74, 108, 247, 0.12);
}

.form-input-lg { padding: 12px 16px; font-size: 16px; border-radius: 10px; }

textarea.form-input { resize: vertical; line-height: 1.8; font-family: var(--font); }

.inline-form { display: inline; }

.inline-form-row {
  display: flex; align-items: flex-end; gap: 12px; flex-wrap: wrap;
}
.inline-form-row .form-group { margin-bottom: 0; }

/* ====== 导航栏 ====== */
.navbar {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.nav-inner {
  max-width: 1120px; margin: 0 auto;
  display: flex; align-items: center;
  padding: 0 28px; height: 60px;
}
.nav-brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.nav-brand-logo {
  width: 30px; height: 30px;
  background: linear-gradient(135deg, #4a6cf7, #6d8ff7);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 2px 6px rgba(74, 108, 247, 0.25);
}
.nav-brand-logo::after {
  content: '';
  width: 14px; height: 14px;
  border: 2px solid rgba(255,255,255,0.9);
  border-radius: 3px;
  border-top: none;
  border-right: none;
  transform: rotate(-45deg);
  margin-top: -2px;
}
.nav-title {
  font-size: 17px; font-weight: 600;
  background: linear-gradient(135deg, #2a2724, #5a5550);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-menu { display: flex; align-items: center; gap: 4px; margin-left: auto; flex-wrap: wrap; justify-content: flex-end; }
.nav-user { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-secondary); padding: 0 10px; }
.user-avatar {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--accent-light); color: var(--accent);
  font-weight: 600; font-size: 14px;
  box-shadow: 0 1px 3px rgba(74, 108, 247, 0.15);
}
.nav-link { font-size: 14px; color: var(--text-secondary); padding: 6px 12px; border-radius: var(--radius); transition: all var(--transition); }
.nav-link:hover { background: var(--border-light); color: var(--text); }
.nav-link-danger { color: var(--text-muted); }
.nav-link-danger:hover { background: var(--danger-light); color: var(--danger); }
.nav-toggle { display: none; align-items: center; justify-content: center; width: 36px; height: 36px; background: none; border: none; border-radius: var(--radius); cursor: pointer; color: var(--text); margin-left: auto; transition: background var(--transition); }
.nav-toggle:hover { background: var(--border-light); }

@media (max-width: 768px) {
  .nav-inner { padding: 0 16px; }
  .nav-menu { display: none; position: absolute; top: 60px; left: 0; right: 0; background: var(--surface); border-bottom: 1px solid var(--border); padding: 12px; flex-direction: column; align-items: stretch; box-shadow: var(--shadow-md); gap: 4px; }
  .nav-menu.show { display: flex; }
  .nav-toggle { display: flex; }
  .nav-link, .nav-user { padding: 10px 12px; }
  .nav-user { border-bottom: 1px solid var(--border-light); margin-bottom: 4px; }
}

/* ====== 主内容区 ====== */
.main-content { max-width: 1120px; margin: 0 auto; padding: 32px 28px; }

.page-header {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin-bottom: 24px;
}
.page-header h2 { font-size: 22px; font-weight: 700; letter-spacing: -0.3px; }
.page-count {
  font-size: 14px; color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2px 12px;
}

/* ====== 空状态 ====== */
.empty-state {
  text-align: center; padding: 64px 24px;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 2px dashed var(--border);
}
.empty-state-title { font-size: 18px; font-weight: 600; margin-bottom: 8px; color: var(--text); }
.empty-state-desc { font-size: 15px; color: var(--text-secondary); margin-bottom: 24px; }

/* ====== 教案卡片 ====== */
.plan-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; }

.plan-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}
.plan-card:hover {
  border-color: #d6cfc6;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.plan-card-thumb { height: 150px; overflow: hidden; background: #f0ece6; display: flex; align-items: center; justify-content: center; }
.plan-card-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.plan-card:hover .plan-card-thumb img { transform: scale(1.05); }

.plan-card-thumb-empty { display: flex; flex-direction: column; align-items: center; gap: 8px; color: var(--text-muted); font-size: 13px; }
.plan-card-thumb-empty .thumb-icon { width: 36px; height: 36px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; }
.plan-card-thumb-empty .thumb-icon::after { content: ''; width: 18px; height: 14px; border: 2px solid #d6cfc6; border-radius: 2px; border-top: none; }
.plan-card-thumb.video-bg { background: #1c1b1a; }
.plan-card-thumb.video-bg .plan-card-thumb-empty { color: rgba(255,255,255,0.4); }
.plan-card-thumb.video-bg .thumb-icon::after { width: 0; height: 0; border: none; border-left: 10px solid rgba(255,255,255,0.4); border-top: 7px solid transparent; border-bottom: 7px solid transparent; }

.plan-card-body { padding: 18px 20px; }

.plan-card-title {
  font-size: 16px; font-weight: 600; margin-bottom: 8px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; line-height: 1.45;
}

.plan-card-meta { font-size: 13px; color: var(--text-secondary); margin-bottom: 14px; line-height: 1.6; }
.plan-card-meta-item { display: inline-flex; align-items: center; gap: 4px; margin-right: 16px; }

.plan-card-actions {
  display: flex; gap: 6px; flex-wrap: wrap;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
}

/* ====== 教案详情 ====== */
.plan-detail { max-width: 800px; margin: 0 auto; }

.detail-actions { display: flex; align-items: center; gap: 8px; margin-bottom: 28px; }
.detail-actions-right { margin-left: auto; display: flex; gap: 8px; }

.detail-header { margin-bottom: 28px; }
.detail-title { font-size: 28px; font-weight: 700; margin-bottom: 12px; line-height: 1.3; letter-spacing: -0.5px; }

.detail-meta { display: flex; gap: 20px; flex-wrap: wrap; font-size: 14px; color: var(--text-secondary); }
.detail-meta span { display: inline-flex; align-items: center; gap: 4px; }

.detail-section { margin-bottom: 32px; }

.detail-content {
  background: var(--surface);
  padding: 28px 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}

.section-label {
  font-size: 16px; font-weight: 600; margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent-light);
  color: var(--text);
}

.content-body { font-size: 15px; line-height: 1.9; color: var(--text); }
.content-body h1, .content-body h2, .content-body h3, .content-body h4 { margin-top: 24px; margin-bottom: 10px; font-weight: 600; }
.content-body p { margin-bottom: 14px; }
.content-body ul, .content-body ol { margin-bottom: 14px; padding-left: 24px; }
.content-body li { margin-bottom: 4px; }
.content-body blockquote { border-left: 3px solid var(--border); padding-left: 20px; margin: 16px 0; color: var(--text-secondary); font-style: italic; }
.content-body img { max-width: 100%; border-radius: var(--radius); margin: 16px 0; box-shadow: var(--shadow-sm); }

/* ====== 图片画廊 ====== */
.image-gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; }
.gallery-item { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface); transition: all var(--transition); }
.gallery-item:hover { border-color: #d6cfc6; box-shadow: var(--shadow-sm); }
.gallery-link { display: block; height: 140px; overflow: hidden; background: #f0ece6; }
.gallery-link img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.4s ease; }
.gallery-item:hover .gallery-link img { transform: scale(1.08); }
.gallery-item-name { padding: 8px 10px; font-size: 12px; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ====== 视频 ====== */
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; }
.video-card { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: #000; box-shadow: var(--shadow-sm); }
.video-player { width: 100%; max-height: 320px; display: block; }
.video-card-info { padding: 10px 12px; background: var(--surface); border-top: 1px solid var(--border); }
.video-card-name { font-size: 13px; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.video-error { padding: 32px; text-align: center; color: var(--danger); background: var(--surface); border-radius: var(--radius); border: 1px solid #fecdd3; font-size: 14px; }
.files-empty { text-align: center; padding: 40px; color: var(--text-muted); background: var(--surface); border-radius: var(--radius-md); border: 2px dashed var(--border); font-size: 14px; }

/* ====== 表单页 ====== */
.form-page { max-width: 800px; margin: 0 auto; }

.plan-form {
  background: var(--surface);
  padding: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.form-section + .form-section { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--border-light); }
.form-section .section-label { font-size: 15px; font-weight: 600; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 2px solid var(--accent-light); color: var(--text); }

.ql-editor { min-height: 360px; font-size: 15px; line-height: 1.8; }
.ql-toolbar { border-radius: var(--radius) var(--radius) 0 0; }
.ql-container { border-radius: 0 0 var(--radius) var(--radius); }

/* ====== 文件上传 ====== */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 24px;
  text-align: center; cursor: pointer;
  transition: all var(--transition);
  background: #faf8f6;
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-light);
  box-shadow: 0 0 0 4px rgba(74, 108, 247, 0.08);
}
.upload-zone.uploading { pointer-events: none; opacity: 0.5; }

.upload-zone-label { font-size: 15px; color: var(--text-secondary); margin-bottom: 6px; }
.upload-zone-hint { font-size: 13px; color: var(--text-muted); }

.upload-progress { margin-top: 16px; text-align: center; }
.progress-bar { height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; margin-bottom: 6px; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent), #6d8ff7); width: 0%; border-radius: 2px; transition: width 0.3s ease; }
.progress-text { font-size: 13px; color: var(--text-secondary); }

.upload-status { margin-top: 12px; }
.status-msg { padding: 6px 10px; border-radius: 6px; font-size: 13px; margin-bottom: 4px; transition: opacity 0.3s; }
.status-success { background: var(--success-light); color: #166534; }
.status-error { background: var(--danger-light); color: #9f1239; }

.file-list { margin-top: 16px; }
.file-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  margin-bottom: 6px;
  font-size: 14px;
  transition: background var(--transition);
}
.file-item:hover { background: #faf8f6; border-color: var(--border); }
.file-item-type { font-size: 12px; font-weight: 500; color: var(--text-secondary); min-width: 30px; }
.file-item-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-item-size { font-size: 12px; color: var(--text-muted); flex-shrink: 0; margin-right: 4px; }
.file-item-remove { background: none; border: none; cursor: pointer; color: var(--text-muted); font-size: 18px; padding: 0 4px; border-radius: 4px; line-height: 1; transition: all 0.1s; }
.file-item-remove:hover { color: var(--danger); }

/* ====== 表单操作 ====== */
.form-actions {
  display: flex; gap: 12px; justify-content: flex-end;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
  margin-top: 28px;
}

/* ====== 文档列表 ====== */
.doc-list { display: flex; flex-direction: column; gap: 6px; }
.doc-item {
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  transition: all var(--transition);
}
.doc-item:hover { border-color: var(--border); background: #faf8f6; }
.doc-link {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 14px; text-decoration: none; color: var(--text);
}
.doc-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  font-size: 11px; font-weight: 700;
  background: var(--accent-light); color: var(--accent);
  flex-shrink: 0;
}
.doc-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 14px; }
.doc-size { font-size: 12px; color: var(--text-muted); flex-shrink: 0; }

/* ====== 卡片 ====== */
.card { background: var(--surface); border-radius: var(--radius-md); border: 1px solid var(--border); overflow: hidden; box-shadow: var(--shadow-sm); }
.card-header { padding: 18px 24px; border-bottom: 1px solid var(--border-light); }
.card-header h3 { font-size: 16px; font-weight: 600; }
.card-body { padding: 24px; }

/* ====== 用户表格 ====== */
.table-wrap { overflow-x: auto; }
.user-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.user-table th, .user-table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border-light); }
.user-table th { font-weight: 500; color: var(--text-secondary); font-size: 13px; background: #faf8f6; }
.user-table tr:last-child td { border-bottom: none; }
.user-table tr:hover td { background: #faf8f6; }
.action-cell { display: flex; gap: 6px; align-items: center; }

.role-badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 500; }
.role-badge-admin { background: var(--accent-light); color: var(--accent); }
.role-badge-user { background: #f0ece6; color: var(--text-secondary); }

/* ====== 登录页 ====== */
.login-page {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #f7f5f2 0%, #eeebe6 100%);
}
.login-container { width: 100%; max-width: 400px; padding: 24px; }
.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 44px 36px;
  box-shadow: var(--shadow-lg);
}
.login-header { text-align: center; margin-bottom: 36px; }
.login-header-title {
  font-size: 24px; font-weight: 700; letter-spacing: -0.5px;
  color: var(--text); margin-bottom: 6px;
}
.login-header-sub { font-size: 15px; color: var(--text-muted); }
.login-form .form-group { margin-bottom: 22px; }
.login-form .form-group label { font-size: 14px; margin-bottom: 6px; }
.login-footer { text-align: center; margin-top: 32px; }
.login-footer-version { font-size: 12px; color: var(--text-muted); }

/* ====== 模态框 ====== */
.modal-overlay { position: fixed; inset: 0; background: rgba(42, 39, 36, 0.4); display: flex; align-items: center; justify-content: center; z-index: 1000; backdrop-filter: blur(4px); }
.modal { background: var(--surface); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); width: 90%; max-width: 420px; }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 18px 24px; border-bottom: 1px solid var(--border-light); }
.modal-header-title { font-size: 17px; font-weight: 600; }
.modal-close { background: none; border: none; font-size: 22px; cursor: pointer; color: var(--text-muted); padding: 4px; line-height: 1; border-radius: var(--radius-sm); transition: all var(--transition); }
.modal-close:hover { color: var(--text); background: var(--border-light); }
.modal-body { padding: 24px; }
.modal-body p { font-size: 14px; color: var(--text-secondary); margin-bottom: 16px; }
.modal-footer { display: flex; gap: 8px; justify-content: flex-end; padding: 16px 24px; border-top: 1px solid var(--border-light); }

/* ====== 响应式 ====== */
@media (max-width: 768px) {
  .main-content { padding: 24px 16px; }
  .plan-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .image-gallery { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  .detail-title { font-size: 22px; }
  .detail-meta { flex-direction: column; gap: 4px; }
  .plan-form { padding: 20px; }
  .detail-content { padding: 20px; }
  .inline-form-row { flex-direction: column; align-items: stretch; }
  .inline-form-row .form-input { width: 100% !important; }
}

@media (max-width: 480px) {
  .login-container { padding: 16px; }
  .login-card { padding: 32px 24px; }
}

/* ====== 课程筛选 ====== */
.course-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 24px; }
.course-tab {
  padding: 8px 18px; border: 1px solid var(--border); border-radius: 20px;
  background: var(--surface); color: var(--text-secondary); cursor: pointer;
  font-size: 14px; transition: all var(--transition); font-family: var(--font);
}
.course-tab:hover { border-color: var(--accent); color: var(--accent); }
.course-tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.course-section { margin-bottom: 32px; }
.course-section-header { display: flex; align-items: baseline; gap: 12px; margin-bottom: 16px; }
.course-section-title { font-size: 18px; font-weight: 600; color: var(--text); }
.course-section-count { font-size: 13px; color: var(--text-muted); }

/* ====== 课时标签 ====== */
.plan-card-session {
  font-size: 12px; color: var(--accent); font-weight: 500;
  background: var(--accent-light); display: inline-block;
  padding: 2px 10px; border-radius: 10px; margin-bottom: 6px;
}

/* ====== 表单行 ====== */
.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }

.detail-course-badge {
  font-size: 12px; background: var(--accent-light); color: var(--accent);
  padding: 2px 10px; border-radius: 10px; font-weight: 500;
}

/* ====== 封面上传 ====== */
.cover-upload { display: flex; align-items: flex-start; gap: 16px; }
.cover-preview { width: 200px; height: 120px; object-fit: cover; border-radius: var(--radius); border: 1px solid var(--border); }
.cover-actions { display: flex; flex-direction: column; gap: 8px; padding-top: 4px; }

/* ====== 数据看板统计条 ====== */
.stats-bar { display: flex; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; }
.stat-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; text-align: center; flex: 1; min-width: 80px; }
.stat-num { display: block; font-size: 24px; font-weight: 700; color: var(--accent); }
.stat-label { display: block; font-size: 11px; color: var(--text-muted); margin-top: 2px; }

/* ====== 标签 ====== */
.tag-badge { display: inline-block; padding: 2px 10px; border-radius: 10px; color: #fff; font-size: 12px; font-weight: 500; margin-right: 4px; }
.plan-card-tags { display: flex; align-items: center; gap: 4px; margin-top: 6px; }
.tag-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; }
.tag-more { font-size: 10px; color: var(--text-muted); }
.detail-tags { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 4px; }
.tag-selector { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-option { cursor: pointer; }
.tag-option input { display: none; }
.tag-option span { display: inline-block; padding: 4px 14px; border-radius: 14px; color: #fff; font-size: 13px; opacity: .6; transition: opacity .2s; }
.tag-option input:checked + span { opacity: 1; box-shadow: 0 0 0 2px rgba(255,255,255,.5); }

/* ====== 筛选栏 ====== */
.filter-bar { margin-bottom: 16px; }
.tag-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.tag-tab { padding: 4px 12px; border-radius: 14px; border: 2px solid var(--border); background: transparent; cursor: pointer; font-size: 12px; color: var(--text); transition: all .2s; }
.tag-tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ====== 详情页操作栏 ====== */
.detail-actions-bar { display: flex; gap: 8px; margin: 16px 0; flex-wrap: wrap; }
.stat-badge { font-size: 12px; color: var(--text-muted); margin-left: 8px; }
.btn-fav-active { background: #f39c12; color: #fff; border-color: #f39c12; }

/* ====== 评论 ====== */
.comment-form { margin: 16px 0; }
.comment-form-actions { display: flex; align-items: center; justify-content: space-between; margin-top: 8px; }
.rating-stars { display: flex; align-items: center; gap: 4px; }
.star { font-size: 24px; cursor: pointer; color: #ddd; transition: color .2s; }
.star:hover, .star.active { color: #f39c12; }
.rating-hint { font-size: 12px; color: var(--text-muted); margin-left: 8px; }
.comments-list { margin-top: 16px; }
.comment-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 16px; margin-bottom: 8px; }
.comment-header { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; font-size: 13px; }
.comment-author { font-weight: 600; }
.comment-rating { color: #f39c12; }
.comment-date { color: var(--text-light); font-size: 12px; }
.comment-delete { margin-left: auto; background: none; border: none; color: var(--danger); cursor: pointer; font-size: 18px; padding: 0 4px; }
.comment-content { font-size: 14px; line-height: 1.6; }
.comments-empty { text-align: center; color: var(--text-muted); padding: 24px; }

/* ====== 版本 ====== */
#versions-section { margin-top: 24px; }
.loading { text-align: center; color: var(--text-muted); padding: 24px; }
.btn-xs { padding: 2px 8px; font-size: 11px; }

/* ====== 标签管理页 ====== */
.tag-manager { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.tag-item { display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px; border-radius: 14px; color: #fff; font-size: 13px; }
.tag-item .tag-del { background: rgba(255,255,255,.3); border: none; color: #fff; border-radius: 50%; width: 16px; height: 16px; font-size: 10px; line-height: 16px; text-align: center; cursor: pointer; }

/* ====== 开关切换 ====== */
.switch-label { display: flex; align-items: center; gap: 12px; cursor: pointer; padding: 8px 0; flex-wrap: wrap; }
.switch-label input[type="checkbox"] { display: none; }
.switch-row { display: flex; align-items: center; gap: 10px; }
.switch-slider { position: relative; width: 44px; height: 24px; background: #3a3530; border-radius: 12px; transition: background .2s; flex-shrink: 0; box-shadow: inset 0 1px 3px rgba(0,0,0,0.3); }
.switch-slider::after { content: ''; position: absolute; top: 2px; left: 2px; width: 20px; height: 20px; background: #8a8580; border-radius: 50%; transition: transform .2s, background .2s; box-shadow: 0 1px 3px rgba(0,0,0,0.3); }
.switch-label input:checked ~ .switch-row .switch-slider { background: #1a1612; }
.switch-label input:checked ~ .switch-row .switch-slider::after { transform: translateX(22px); background: #fff; }
.switch-text { font-size: 14px; color: var(--text); font-weight: 500; flex-shrink: 0; }
.switch-status { font-size: 13px; font-weight: 600; white-space: nowrap; }
.switch-status::before { content: '关闭'; color: var(--text-muted); }
.switch-label input:checked ~ .switch-row .switch-status::before { content: '开启'; color: var(--accent); }

/* ====== 导航激活状态 ====== */
.nav-link-active { color: var(--accent) !important; font-weight: 600; }

/* ====== 温馨小提示 ====== */
.hint { font-size: 12px; color: var(--text-muted); line-height: 1.5; margin: 8px 0; display: flex; align-items: center; gap: 4px; }
.hint-icon { display: inline-flex; align-items: center; justify-content: center; width: 18px; height: 18px; border-radius: 50%; background: var(--accent-light); color: var(--accent); font-size: 10px; font-weight: 700; flex-shrink: 0; }