/* ===== 糖心Vlog 主样式 ===== */
/* 版本：1.0 | 风格：温暖治愈·自然生活·人文气息 */

:root {
  --color-primary: #D4A373;
  --color-secondary: #FAEDCD;
  --color-bg: #FEFAE0;
  --color-bg-alt: #F5EDD8;
  --color-text: #3D3028;
  --color-text-light: #7A6A5A;
  --color-accent: #CCD5AE;
  --color-border: #E8D8C0;
  --color-white: #FFFFFF;
  --font-main: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(180,140,100,0.10);
  --shadow-hover: 0 8px 36px rgba(180,140,100,0.18);
  --transition: 0.3s ease;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

/* ===== 布局 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-alt { background: var(--color-bg-alt); }

/* ===== 顶部导航 ===== */
.site-header {
  background: rgba(254,250,224,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: 0 2px 20px rgba(180,140,100,0.12); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: 24px;
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-img { width: 44px; height: 44px; border-radius: 50%; object-fit: cover; }
.logo-text { font-size: 1.25rem; font-weight: 700; color: var(--color-primary); letter-spacing: 0.04em; }

/* 导航菜单 */
.main-nav { display: flex; align-items: center; gap: 0; }
.main-nav a {
  padding: 8px 16px;
  font-size: 0.92rem;
  color: var(--color-text-light);
  border-radius: 6px;
  transition: all var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--color-primary);
  background: var(--color-secondary);
}

/* 搜索框 */
.search-wrap {
  display: flex;
  align-items: center;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  padding: 6px 16px;
  gap: 8px;
  min-width: 200px;
  transition: all var(--transition);
}
.search-wrap:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(212,163,115,0.15);
}
.search-input {
  border: none;
  background: transparent;
  font-size: 0.9rem;
  color: var(--color-text);
  outline: none;
  width: 100%;
  font-family: var(--font-main);
}
.search-input::placeholder { color: var(--color-text-light); }
.search-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-light);
  padding: 0;
  display: flex;
  align-items: center;
  transition: color var(--transition);
}
.search-btn:hover { color: var(--color-primary); }

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===== Hero Banner ===== */
.hero {
  position: relative;
  height: 600px;
  overflow: hidden;
  display: flex;
  align-items: center;
}
.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(62,48,36,0.55) 0%, rgba(62,48,36,0.2) 60%, transparent 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 600px;
  padding: 0 24px;
  margin-left: 8%;
}
.hero-badge {
  display: inline-block;
  background: rgba(212,163,115,0.85);
  color: #fff;
  font-size: 0.8rem;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 0.06em;
}
.hero-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 16px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.2);
}
.hero-subtitle {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.9);
  margin-bottom: 32px;
  line-height: 1.7;
}
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-primary);
  color: #fff;
  padding: 14px 32px;
  border-radius: 32px;
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(212,163,115,0.4);
}
.hero-cta:hover {
  background: #c4935f;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(212,163,115,0.5);
}

/* ===== 标题组件 ===== */
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--color-primary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 10px;
  font-weight: 500;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 14px;
  line-height: 1.4;
}
.section-desc {
  font-size: 1rem;
  color: var(--color-text-light);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
}
.section-updated {
  font-size: 0.78rem;
  color: #b0a090;
  margin-top: 8px;
}

/* ===== 生活哲学 ===== */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.philosophy-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  border: 1px solid var(--color-border);
}
.philosophy-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.philosophy-icon {
  width: 56px;
  height: 56px;
  background: var(--color-secondary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.5rem;
}
.philosophy-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}
.philosophy-card p {
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.video-card {
  background: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  cursor: pointer;
  border: 1px solid var(--color-border);
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.video-thumb-wrap {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #e8d8c0;
}
.video-thumb-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb-wrap img { transform: scale(1.06); }

.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0);
  transition: background var(--transition);
}
.video-card:hover .video-play-btn { background: rgba(0,0,0,0.28); }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(255,255,255,0.92);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}
.video-card:hover .play-icon {
  opacity: 1;
  transform: scale(1);
}
.play-icon svg { margin-left: 4px; }

.video-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 500;
}
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.65);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 6px;
}

.video-info { padding: 18px 20px; }
.video-info h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.5;
}
.video-info p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: #b0a090;
}
.video-meta span { display: flex; align-items: center; gap: 4px; }

/* ===== 数据统计 ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-card {
  text-align: center;
  padding: 36px 20px;
  background: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}
.stat-number {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* ===== 匠人 ===== */
.artisan-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}
.artisan-card {
  display: flex;
  gap: 24px;
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
.artisan-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.artisan-photo {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 3px solid var(--color-secondary);
}
.artisan-info h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 4px;
}
.artisan-role {
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-bottom: 12px;
  font-weight: 500;
}
.artisan-story {
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ===== 媒体报道 ===== */
.media-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.media-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow);
  transition: all var(--transition);
}
.media-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary);
}
.media-source {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: 0.04em;
}
.media-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
  line-height: 1.5;
}
.media-date { font-size: 0.8rem; color: #b0a090; }

/* ===== 加入我们 ===== */
.join-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, #c4935f 100%);
  color: #fff;
  text-align: center;
  padding: 80px 24px;
}
.join-section .section-title { color: #fff; }
.join-section .section-desc { color: rgba(255,255,255,0.85); }
.join-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  color: var(--color-primary);
  padding: 14px 36px;
  border-radius: 32px;
  font-size: 1rem;
  font-weight: 700;
  margin-top: 32px;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
.join-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,0,0,0.2);
}

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
}
.contact-info p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 24px;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 0.95rem;
  color: var(--color-text-light);
}
.contact-icon {
  width: 36px;
  height: 36px;
  background: var(--color-secondary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
}
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.88rem; color: var(--color-text-light); font-weight: 500; }
.form-group input, .form-group textarea, .form-group select {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 0.92rem;
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition);
  resize: vertical;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(212,163,115,0.12);
}
.form-submit {
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 32px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-main);
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(212,163,115,0.3);
}
.form-submit:hover {
  background: #c4935f;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(212,163,115,0.4);
}

/* ===== 用户评论 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.review-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow);
  transition: all var(--transition);
}
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.review-stars { color: #F4A261; font-size: 1rem; margin-bottom: 12px; }
.review-text {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 16px;
  font-style: italic;
}
.review-user {
  display: flex;
  align-items: center;
  gap: 10px;
}
.review-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
}
.review-name { font-size: 0.9rem; font-weight: 600; color: var(--color-text); }
.review-date { font-size: 0.78rem; color: #b0a090; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--transition);
  user-select: none;
}
.faq-question:hover { color: var(--color-primary); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
  font-size: 1rem;
  color: var(--color-primary);
}
.faq-item.active .faq-icon { background: var(--color-primary); color: #fff; transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}
.faq-answer-inner {
  padding: 0 0 20px;
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.8;
}
.faq-item.active .faq-answer { max-height: 300px; }

/* ===== 社交分享 ===== */
.social-bar {
  background: var(--color-bg-alt);
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.social-bar h3 {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 20px;
  font-weight: 500;
}
.social-links { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.social-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 24px;
  font-size: 0.88rem;
  font-weight: 500;
  transition: all var(--transition);
  border: 1px solid var(--color-border);
  background: var(--color-white);
  color: var(--color-text);
}
.social-link:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.social-link.wechat:hover { background: #07C160; color: #fff; border-color: #07C160; }
.social-link.weibo:hover { background: #E6162D; color: #fff; border-color: #E6162D; }
.social-link.xiaohongshu:hover { background: #FE2C55; color: #fff; border-color: #FE2C55; }
.social-link.douyin:hover { background: #000; color: #fff; border-color: #000; }
.social-link.bilibili:hover { background: #00A1D6; color: #fff; border-color: #00A1D6; }

/* ===== 页脚 ===== */
.site-footer {
  background: #2D2318;
  color: rgba(255,255,255,0.75);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand .logo-text { color: var(--color-primary); font-size: 1.3rem; margin-bottom: 12px; display: block; }
.footer-brand p { font-size: 0.88rem; line-height: 1.8; color: rgba(255,255,255,0.6); margin-bottom: 16px; }
.footer-col h4 { font-size: 0.95rem; font-weight: 600; color: rgba(255,255,255,0.9); margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 0.88rem; color: rgba(255,255,255,0.55); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--color-primary); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: 0.82rem; color: rgba(255,255,255,0.45); }
.footer-logo-img { width: 36px; height: 36px; border-radius: 50%; object-fit: cover; }

/* ===== 搜索结果弹窗 ===== */
.search-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
  align-items: flex-start;
  justify-content: center;
  padding-top: 80px;
}
.search-modal.active { display: flex; }
.search-modal-inner {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  width: 90%;
  max-width: 560px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}
.search-modal-title { font-size: 0.9rem; color: var(--color-text-light); margin-bottom: 16px; }
.search-result-list { display: flex; flex-direction: column; gap: 12px; }
.search-result-item {
  padding: 12px;
  border-radius: 8px;
  background: var(--color-bg-alt);
  font-size: 0.9rem;
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition);
}
.search-result-item:hover { background: var(--color-secondary); }
.search-close {
  display: block;
  text-align: right;
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--color-text-light);
  cursor: pointer;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 12px 0;
  font-size: 0.85rem;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb a { color: var(--color-primary); }
.breadcrumb span { color: #b0a090; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .hero { height: 480px; }
  .hero-content { margin-left: 0; padding: 0 20px; }
  .hero-title { font-size: 1.8rem; }
  .philosophy-grid { grid-template-columns: 1fr; gap: 20px; }
  .video-grid { grid-template-columns: 1fr; }
  .artisan-grid { grid-template-columns: 1fr; }
  .media-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .main-nav { display: none; }
  .hamburger { display: flex; }
  .search-wrap { min-width: 140px; }
  .header-inner { gap: 12px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { height: 400px; }
  .hero-cta { padding: 12px 24px; font-size: 0.95rem; }
  .search-wrap { min-width: 120px; }
}

/* ===== 移动端导航 ===== */
.mobile-nav {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  background: rgba(254,250,224,0.98);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 24px;
  z-index: 99;
  flex-direction: column;
  gap: 4px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}
.mobile-nav.active { display: flex; }
.mobile-nav a {
  padding: 12px 16px;
  font-size: 1rem;
  color: var(--color-text);
  border-radius: 8px;
  transition: all var(--transition);
}
.mobile-nav a:hover { background: var(--color-secondary); color: var(--color-primary); }

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp 0.6s ease both; }

/* ===== 回到顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(16px);
  transition: all var(--transition);
  z-index: 50;
  box-shadow: 0 4px 16px rgba(212,163,115,0.4);
  border: none;
  font-size: 1.1rem;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); }
.back-to-top:hover { background: #c4935f; transform: translateY(-2px); }