/* ==================== 全局样式 ==================== */
:root {
  /* 颜色变量 */
  --bg-primary: #FAF9F6;
  --bg-card: #FFFFFF;
  --bg-tag: #F0F9F6;
  --bg-note: #FFF9F0;
  
  --text-primary: #2D3436;
  --text-secondary: #636E72;
  --text-light: #B2BEC3;
  
  --accent-teal: #00B894;
  --accent-teal-light: #55EFC4;
  --accent-pink: #FD79A8;
  --accent-purple: #A29BFE;
  --accent-orange: #FFEAA7;
  --accent-blue: #74B9FF;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 50%;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.4s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ==================== 头部区域 ==================== */
.header {
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1400px;
  margin: 0 auto;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header__logo-icon {
  font-size: 32px;
}

.header__logo-text {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
}

.header__search {
  position: relative;
  width: 300px;
}

.header__search-input {
  width: 100%;
  padding: 12px 20px 12px 44px;
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  font-size: 14px;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.header__search-input:focus {
  outline: none;
  border-color: var(--accent-teal);
  box-shadow: var(--shadow-md);
}

.header__search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 16px;
  color: var(--text-light);
}

/* ==================== 标签导航 ==================== */
.nav-tabs {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 0 32px;
  margin-bottom: 32px;
}

.nav-tab {
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.nav-tab:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.nav-tab--active {
  background: var(--accent-teal);
  color: white;
  font-weight: 600;
}

/* ==================== 子分类筛选 ==================== */
.subcategory-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0 32px;
  margin-bottom: 24px;
  justify-content: center;
}

.subcategory-btn {
  padding: 8px 18px;
  border: 1px solid #E8E8E8;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
}

.subcategory-btn:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
}

.subcategory-btn--active {
  background: var(--accent-teal);
  border-color: var(--accent-teal);
  color: white;
}

/* ==================== 内容区域 ==================== */
.content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 32px 60px;
}

.content__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

/* ==================== 卡片样式 ==================== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
}

.card__title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__date {
  font-size: 12px;
  color: var(--text-light);
  white-space: nowrap;
  margin-left: 12px;
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.card__tag {
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
  background: var(--bg-tag);
  color: var(--accent-teal);
}

.card__tag--pink {
  background: #FFF0F5;
  color: var(--accent-pink);
}

.card__tag--purple {
  background: #F5F0FF;
  color: var(--accent-purple);
}

.card__tag--orange {
  background: #FFF8E1;
  color: #FDCB6E;
}

.card__tag--blue {
  background: #EBF5FF;
  color: var(--accent-blue);
}

.card__note {
  background: var(--bg-note);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--text-secondary);
  border-left: 3px solid var(--accent-orange);
}

.card__content {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.card__description {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  background: var(--accent-teal);
  color: white;
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: var(--transition-fast);
}

.card__link:hover {
  background: #00A385;
  transform: scale(1.02);
}

.card__edit-btn {
  padding: 8px 16px;
  border: 1px solid #E8E8E8;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
}

.card__edit-btn:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
}

/* ==================== 视频区域 ==================== */
.videos-section {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid #E8E8E8;
}

.videos-section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.videos-section__title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
}

.videos-section__scroll {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding-bottom: 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--accent-teal) transparent;
}

.videos-section__scroll::-webkit-scrollbar {
  height: 6px;
}

.videos-section__scroll::-webkit-scrollbar-track {
  background: transparent;
}

.videos-section__scroll::-webkit-scrollbar-thumb {
  background: var(--accent-teal);
  border-radius: 3px;
}

.video-card {
  flex-shrink: 0;
  width: 180px;
  cursor: pointer;
  transition: var(--transition-normal);
}

.video-card:hover {
  transform: translateY(-4px);
}

.video-card__thumbnail {
  width: 180px;
  height: 320px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-teal-light), var(--accent-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  margin-bottom: 12px;
  position: relative;
  overflow: hidden;
}

.video-card__duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 500;
}

.video-card__title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==================== 漂浮图标 ==================== */
.floating-icons {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 1000;
}

.floating-icons__trigger {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--accent-teal);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: var(--shadow-lg);
  transition: var(--transition-normal);
  animation: float 3s ease-in-out infinite;
}

.floating-icons__trigger:hover {
  transform: scale(1.1);
  animation-play-state: paused;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

.floating-icons__panel {
  position: absolute;
  bottom: 70px;
  right: 0;
  width: 280px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px) scale(0.95);
  transition: var(--transition-normal);
}

.floating-icons__panel--open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.floating-icons__panel-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid #E8E8E8;
}

.floating-icons__list {
  list-style: none;
  max-height: 300px;
  overflow-y: auto;
}

.floating-icons__item {
  padding: 10px 0;
  border-bottom: 1px solid #F0F0F0;
}

.floating-icons__item:last-child {
  border-bottom: none;
}

.floating-icons__item-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  transition: var(--transition-fast);
}

.floating-icons__item-link:hover {
  color: var(--accent-teal);
}

.floating-icons__item-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: var(--bg-tag);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
}

.floating-icons__item-text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.floating-icons__empty {
  text-align: center;
  color: var(--text-light);
  font-size: 13px;
  padding: 20px 0;
}

/* ==================== 模态框 ==================== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.modal--open {
  opacity: 1;
  visibility: visible;
}

.modal__content {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 90%;
  max-width: 500px;
  transform: scale(0.9);
  transition: var(--transition-normal);
}

.modal--open .modal__content {
  transform: scale(1);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal__title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.modal__close {
  width: 32px;
  height: 32px;
  border: none;
  background: var(--bg-primary);
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.modal__close:hover {
  background: #E8E8E8;
}

.modal__form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.modal__input,
.modal__textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid #E8E8E8;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-family: inherit;
  transition: var(--transition-fast);
  resize: none;
}

.modal__input:focus,
.modal__textarea:focus {
  outline: none;
  border-color: var(--accent-teal);
}

.modal__textarea {
  min-height: 120px;
}

.modal__actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 8px;
}

.modal__btn {
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
}

.modal__btn--cancel {
  background: var(--bg-primary);
  border: 1px solid #E8E8E8;
  color: var(--text-secondary);
}

.modal__btn--cancel:hover {
  background: #E8E8E8;
}

.modal__btn--save {
  background: var(--accent-teal);
  border: none;
  color: white;
}

.modal__btn--save:hover {
  background: #00A385;
}

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

.empty-state__icon {
  font-size: 64px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state__text {
  font-size: 16px;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
  .header {
    padding: 16px 20px;
    flex-direction: column;
    gap: 16px;
  }
  
  .header__search {
    width: 100%;
  }
  
  .nav-tabs {
    padding: 0 20px;
    gap: 10px;
  }
  
  .nav-tab {
    padding: 10px 18px;
    font-size: 14px;
  }
  
  .subcategory-filter {
    padding: 0 20px;
  }
  
  .content {
    padding: 0 20px 100px;
  }
  
  .content__grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .floating-icons {
    bottom: 20px;
    right: 20px;
  }
  
  .floating-icons__trigger {
    width: 50px;
    height: 50px;
    font-size: 20px;
  }
  
  .floating-icons__panel {
    width: 260px;
    right: -10px;
  }
  
  .videos-section__scroll {
    gap: 16px;
  }
  
  .video-card {
    width: 150px;
  }
  
  .video-card__thumbnail {
    width: 150px;
    height: 267px;
  }
}

@media (max-width: 480px) {
  .nav-tabs {
    overflow-x: auto;
    justify-content: flex-start;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }
  
  .nav-tab {
    flex-shrink: 0;
  }
  
  .subcategory-filter {
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 8px;
  }
  
  .subcategory-btn {
    flex-shrink: 0;
  }
}

/* ==================== 隐藏类 ==================== */
.hidden {
  display: none !important;
}