/* ========================================
   Layout - 布局样式（经典简洁版）
   ======================================== */

/* === Header 导航 === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid var(--border-light);
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
}




.search-overlay.active {
  opacity: 1;
  visibility: visible;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  position: relative;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--primary);
  background: var(--primary-pale);
}

.nav-link.active {
  color: var(--primary);
  background: var(--primary-pale);
}

/* === 下拉导航 === */
.nav-item {
  position: relative;
}

.nav-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  user-select: none;
}

.nav-arrow {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.nav-item.has-dropdown:hover .nav-arrow,
.nav-item.has-dropdown:focus-within .nav-arrow {
  transform: rotate(180deg);
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 240px;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: var(--z-dropdown);
  pointer-events: none;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-item.has-dropdown:hover .nav-dropdown,
.nav-item.has-dropdown:focus-within .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.nav-dropdown::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 12px;
  height: 12px;
  background: var(--surface);
  border-left: 1px solid var(--border-light);
  border-top: 1px solid var(--border-light);
  transform: translateX(-50%) rotate(45deg);
  border-radius: 2px;
}

.nav-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  transition: background var(--transition-fast);
  text-decoration: none;
}

.nav-dropdown-item:hover {
  background: var(--primary-pale);
}

.nav-dropdown-icon {
  font-size: var(--text-xl);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-pale);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.nav-dropdown-item:hover .nav-dropdown-icon {
  background: var(--primary);
  color: white;
}

.nav-dropdown-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-dropdown-text strong {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

.nav-dropdown-text small {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: var(--space-2);
  cursor: pointer;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* === Hero 轮播区域 === */
.hero-carousel {
  position: relative;
  min-height: calc(100vh - 72px);
  padding-top: 72px;
  overflow: hidden;
}

.carousel-container {
  position: relative;
  width: 100%;
  height: calc(100vh - 72px);
}

.carousel-slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s ease, visibility 0.8s ease;
}

.carousel-slide.active {
  opacity: 1;
  visibility: visible;
}

.carousel-slide .slide-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.carousel-slide .slide-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 2px 2px, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
}

.slide-content {
  position: relative;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-16) var(--space-6);
  color: var(--text-light);
}

.slide-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  background: var(--primary-pale);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--primary);
  margin-bottom: var(--space-6);
}

.slide-title {
  margin-bottom: var(--space-6);
}

.slide-title-main {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: var(--font-bold);
  color: white;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
  line-height: 1.2;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.slide-title-sub {
  display: block;
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: var(--font-normal);
  color: rgba(255,255,255,0.9);
  margin-top: var(--space-2);
}

.slide-desc {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: rgba(255,255,255,0.85);
  line-height: var(--leading-relaxed);
  max-width: 600px;
  margin: 0 auto var(--space-10);
  text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.slide-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* 轮播指示器 */
.carousel-indicators {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--space-3);
  z-index: 10;
}

.indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.indicator:hover {
  background: rgba(255, 255, 255, 0.6);
}

.indicator.active {
  background: white;
  transform: scale(1.2);
}

/* 轮播控制按钮 */
.carousel-control {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: white;
  font-size: 24px;
  cursor: pointer;
  transition: all 0.3s ease;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.carousel-control:hover {
  background: rgba(255, 255, 255, 0.3);
}

.carousel-control.prev {
  left: 20px;
}

.carousel-control.next {
  right: 20px;
}

/* 保持原有hero-desc兼容性 */
.hero-desc {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 600px;
  margin: 0 auto var(--space-10);
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-12);
  margin-top: var(--space-12);
  padding-top: var(--space-10);
  border-top: 1px solid var(--border-light);
}

.hero-stat {
  text-align: center;
}

.hero-stat-value {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--primary);
  line-height: 1;
  margin-bottom: var(--space-1);
}

.hero-stat-label {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* === Philosophy 理念 === */
.philosophy-section {
  background: linear-gradient(180deg, #e8f0e8 0%, #ffffff 100%);
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.philosophy-card {
  position: relative;
  text-align: center;
  padding: var(--space-8);
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-base);
}

.philosophy-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.philosophy-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--space-5);
  background: var(--primary-pale);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  transition: all var(--transition-base);
}

.philosophy-card:hover .philosophy-icon {
  background: var(--primary);
  color: var(--text-light);
}

.philosophy-icon svg {
  width: 32px;
  height: 32px;
}

.philosophy-card h3 {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-3);
  color: var(--text-primary);
}

.philosophy-card p {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
}

/* === Systems 六大体系 === */
.systems-section {
  background: linear-gradient(135deg, #1a4d3a 0%, #2d5a47 100%);
  position: relative;
}

.systems-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 2px 2px, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
}

.systems-section .section-header {
  position: relative;
}

.systems-section .section-tag {
  background: rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.systems-section .section-title {
  color: #ffffff;
}

.systems-section .section-desc {
  color: rgba(255, 255, 255, 0.7);
}

.systems-section .system-card {
  background: rgba(255, 255, 255, 0.95);
}

.systems-section .system-card:hover {
  background: #ffffff;
}

.systems-section .system-card h3 {
  color: var(--text-primary);
}

.systems-section .system-card p {
  color: var(--text-secondary);
}

.systems-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.system-card {
  position: relative;
  display: block;
  padding: var(--space-6);
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-base);
}

.system-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.system-card.highlight {
  border: 2px solid var(--primary);
}

.system-card.highlight .system-badge {
  position: absolute;
  top: -1px;
  right: 16px;
  background: var(--primary);
  color: var(--text-light);
  font-size: 11px;
  font-weight: var(--font-semibold);
  padding: 4px 12px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.system-icon {
  width: 56px;
  height: 56px;
  margin-bottom: var(--space-4);
  background: var(--primary-pale);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  transition: all var(--transition-base);
}

.system-card:hover .system-icon {
  background: var(--primary);
  color: var(--text-light);
}

.system-icon svg {
  width: 28px;
  height: 28px;
}

.system-card h3 {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.system-card p {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.system-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--primary);
}

.system-link:hover {
  gap: var(--space-2);
}

.system-link svg {
  width: 14px;
  height: 14px;
}

/* === Team 团队预览 === */
.team-preview {
  background: linear-gradient(180deg, #ffffff 0%, #f5faf5 100%);
}

.team-preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.team-card {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-base);
}

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

.team-avatar {
  position: relative;
  width: 100px;
  height: 100px;
  margin: 0 auto var(--space-5);
  border-radius: 50%;
  overflow: hidden;
  background: var(--primary);
}

.team-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-3xl);
  color: var(--text-light);
  font-family: var(--font-serif);
}

.team-card h3 {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-1);
  color: var(--text-primary);
}

.team-title {
  font-size: var(--text-sm);
  color: var(--primary);
  font-weight: var(--font-medium);
  margin-bottom: var(--space-3);
}

.team-bio {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
}

/* === Testimonials 学员评价 === */
.testimonials {
  background: linear-gradient(135deg, #1a4d3a 0%, #2d5a47 100%);
  position: relative;
}

.testimonials::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 2px 2px, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
}

.testimonials .section-header {
  position: relative;
}

.testimonials .section-tag {
  background: rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.testimonials .section-title {
  color: #ffffff;
}

.testimonials .section-desc {
  color: rgba(255, 255, 255, 0.7);
}

.testimonials-slider {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.testimonial-card {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.testimonials .testimonial-card {
  background: rgba(255, 255, 255, 0.95);
}

.testimonial-rating {
  display: flex;
  gap: var(--space-1);
  color: var(--accent);
  font-size: var(--text-base);
  margin-bottom: var(--space-3);
}

.testimonial-content {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-5);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-family: var(--font-serif);
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
}

.testimonial-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.author-name {
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  color: var(--text-primary);
}

.author-course {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* === News 新闻动态 === */
.news-preview {
  background: linear-gradient(180deg, #f5faf5 0%, #ffffff 100%);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.news-card {
  position: relative;
  display: block;
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-base);
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.news-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
}

.news-tag-course { background: var(--primary-pale); color: var(--primary); }
.news-tag-activity { background: rgba(74, 144, 217, 0.1); color: #4a90d9; }
.news-tag-notice { background: var(--accent-pale); color: #a08030; }

.news-card h3 {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
  line-height: var(--leading-snug);
  color: var(--text-primary);
}

.news-card p {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-3);
}

.news-meta {
  display: flex;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* === CTA 行动召唤 === */
.cta-section {
  padding: var(--space-16) 0;
  background: linear-gradient(135deg, #1a4d3a 0%, #2d5a47 100%);
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 2px 2px, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
}

.cta-box {
  position: relative;
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-lg);
  padding: var(--space-12);
  text-align: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.cta-box h2 {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.cta-box p {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.cta-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* === 课程预告 === */
.course-preview { background: var(--bg); }
.course-preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}
@media (max-width: 900px) { .course-preview-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .course-preview-grid { grid-template-columns: 1fr; } }
.course-preview-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: 28px;
  border: 1px solid var(--border);
  position: relative;
  transition: all 0.3s;
}
.course-preview-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(45,90,74,0.12);
  border-color: var(--primary-light);
}
.course-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
  background: var(--primary);
  color: white;
  margin-bottom: 12px;
}
.course-preview-card h3 { font-size: 18px; margin-bottom: 6px; }
.course-date { font-size: 13px; color: var(--text-muted); margin-bottom: 8px; }
.course-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; }
.course-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.course-preview-card .btn-sm { padding: 8px 20px; font-size: 13px; }

/* === 视频展示 === */
.video-showcase {
  background: var(--bg);
  padding: var(--section-padding) 0;
}
.video-showcase-wrapper {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 32px;
  align-items: start;
}
/* 主视频播放器 */
.video-main {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: #000;
  box-shadow: 0 8px 40px rgba(0,0,0,0.15);
}
.video-main::before {
  content: '';
  display: block;
  padding-top: 56.25%; /* 16:9 */
}
.video-main iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: none;
}
.video-main-placeholder {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a3a2f 0%, #2D5A4A 100%);
  color: #fff;
  gap: 12px;
}
.video-main-placeholder svg {
  width: 56px; height: 56px;
  opacity: 0.6;
}
.video-main-placeholder span {
  font-size: 13px;
  opacity: 0.5;
}
.video-info {
  padding: 20px 0 0;
}
.video-info h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--primary);
}
.video-info p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}
/* 视频列表 */
.video-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.video-thumb {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 12px;
  align-items: center;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 10px;
  cursor: pointer;
  transition: all 0.25s;
  text-decoration: none;
  color: inherit;
}
.video-thumb:hover,
.video-thumb.active {
  border-color: var(--primary);
  box-shadow: 0 4px 16px rgba(45,90,74,0.12);
  transform: translateX(3px);
}
.video-thumb.active {
  background: rgba(45,90,74,0.05);
}
.video-thumb-cover {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: linear-gradient(135deg, #1a3a2f, #2D5A4A);
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
}
.video-thumb-cover svg {
  width: 28px; height: 28px;
  color: #fff;
  opacity: 0.9;
  filter: drop-shadow(0 1px 3px rgba(0,0,0,0.4));
  transition: transform 0.2s;
}
.video-thumb:hover .video-thumb-cover svg {
  transform: scale(1.1);
}
.video-thumb-cover span {
  position: absolute;
  bottom: 4px; right: 6px;
  font-size: 10px;
  color: #fff;
  background: rgba(0,0,0,0.5);
  padding: 1px 5px;
  border-radius: 3px;
}
.video-thumb-info h4 {
  font-size: 13px;
  margin-bottom: 4px;
  line-height: 1.4;
}
.video-thumb-info p {
  font-size: 11px;
  color: var(--text-muted);
}

/* === 每日一症 === */
.daily-tip { background: linear-gradient(135deg, rgba(45,90,74,0.03) 0%, rgba(201,169,76,0.03) 100%); }
.daily-tip-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}
@media (max-width: 900px) { .daily-tip-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .daily-tip-grid { grid-template-columns: 1fr; } }
.tip-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: 24px;
  border: 1px solid var(--border);
  transition: all 0.3s;
}
.tip-card:hover { transform: translateY(-3px); box-shadow: 0 8px 32px rgba(45,90,74,0.1); }
.tip-category {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
  background: rgba(201,169,76,0.15);
  color: var(--accent);
  margin-bottom: 12px;
}
.tip-card h3 { font-size: 17px; margin-bottom: 10px; }
.tip-content { font-size: 13px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 12px; }
.tip-solution {
  background: rgba(45,90,74,0.05);
  border-radius: var(--radius-md);
  padding: 12px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}
.tip-solution strong { color: var(--primary); }
.tip-link { font-size: 13px; color: var(--primary); text-decoration: none; font-weight: 500; }
.tip-link:hover { text-decoration: underline; }

/* === Footer 页脚 === */
.footer {
  background: #1a1a1a;
  color: rgba(255, 255, 255, 0.6);
  padding: var(--space-12) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-10);
  margin-bottom: var(--space-10);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.footer-logo .logo-icon {
  background: var(--text-light);
  color: var(--primary);
}

.footer-logo .logo-text {
  color: var(--text-light);
  font-size: var(--text-lg);
}

.footer-brand p {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
  line-height: var(--leading-relaxed);
}

.footer-social {
  display: flex;
  gap: var(--space-3);
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--primary);
  color: var(--text-light);
}

.footer-social svg {
  width: 18px;
  height: 18px;
}

.footer-links h4,
.footer-contact h4 {
  color: var(--text-light);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-4);
}

.footer-links ul li,
.footer-contact ul li {
  margin-bottom: var(--space-3);
}

.footer-links a {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
  transition: all var(--transition-fast);
}

.footer-links a:hover {
  color: #c9a84c;
}

.footer-contact ul li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast);
}

.footer-contact ul li:hover {
  color: #c9a84c;
}

.footer-contact svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: #c9a84c;
}

.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-bottom p {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.35);
}

/* === Section 区块 === */
.section {
  padding: var(--space-16) 0;
}

.section-alt {
  background: var(--surface-alt);
}