*{margin:0;padding:0;box-sizing:border-box;scrollbar-width:thin;scrollbar-color:#db91f3 #ffd6d6}::-webkit-scrollbar{width:5px;height:5px;background:#ffd6d6}::-webkit-scrollbar-button{display:none}::-webkit-scrollbar-track{background:#ffd6d6}::-webkit-scrollbar-track-piece{display:none}::-webkit-scrollbar-thumb{background:#db91f3;border-radius:3px;transition:background .2s}::-webkit-scrollbar-thumb:hover{background:#b63f9a}::-webkit-scrollbar-corner{background:#ffd6d6}body{min-height:100vh;display:flex;flex-direction:column;font-family:Arial,sans-serif;line-height:1.6;background:#f5f5f5}header{background:#f8f9fa;padding:1rem;box-shadow:0 2px 4px rgba(0,0,0,.1);position:fixed;width:100%;top:0;z-index:1001}.header-content{max-width:1300px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.header-logo{width:50px;height:50px}.header-logo img{width:100%;height:100%;transition:transform .3s cubic-bezier(.68,-.55,.265,1.55)}.header-logo img:hover{transform:scale(1.15)}nav.top-nav{display:flex;gap:.5rem}nav.top-nav a{text-decoration:none;color:#333;transition:color .3s}nav.top-nav a:hover{color:#007bff}.menu-toggle{display:none;flex-direction:column;justify-content:space-between;width:30px;height:21px;cursor:pointer;z-index:1002}.menu-toggle span{display:block;height:3px;width:100%;background:#333;border-radius:3px;transition:all .3s}.menu-toggle.active span:nth-child(1){transform:translateY(9px) rotate(45deg)}.menu-toggle.active span:nth-child(2){opacity:0}.menu-toggle.active span:nth-child(3){transform:translateY(-9px) rotate(-45deg)}.sidebar{width:200px;background:#fff;height:calc(100vh - 64px);position:fixed;left:0;top:88px;box-shadow:2px 0 5px rgba(0,0,0,.1);overflow-y:auto;z-index:1000;-webkit-overflow-scrolling:touch;overscroll-behavior:smooth}.sidebar-logo{padding:10px;text-align:center;border-bottom:1px solid #eee}.sidebar-logo h1{font-size:20px;color:#333}.category{border-bottom:1px solid #f0f0f0}.category-header{padding:10px 40px;display:flex;align-items:center;justify-content:space-between;cursor:pointer;background:#fff;transition:background .3s}.category-header:hover{background:#f8f8f8}.category-title{display:flex;align-items:center;gap:10px;font-size:16px;color:#333}.category-icon{width:24px;height:24px;display:flex;align-items:center;justify-content:center;background:#f5f5f5;border-radius:50%}.arrow{width:20px;height:20px;display:flex;align-items:center;justify-content:center;transition:transform .3s}.arrow::after{content:"›";font-size:20px;color:#666}.category.active .arrow{transform:rotate(90deg)}.subcategories{display:none;padding:10px 0;background:#f9f9f9}.category.active .subcategories{display:block}.subcategory{padding:8px 20px 8px 54px;font-size:14px;color:#666;display:flex;align-items:center;cursor:pointer;transition:all .2s}.subcategory:hover{background:#f0f0f0;color:#4a90e2}.subcategory.active{background:#e6f0fa;color:#4a90e2;font-weight:500}.subcategory::before{content:"•";margin-right:8px;color:#999}.main-content{margin-left:200px;margin-top:60px;padding:20px;flex-grow:1}.content-section{display:none;animation:fadeIn .3s}.content-section.active{display:block}.content-header{background:#fff;padding:10px;border-radius:8px;margin-bottom:10px;box-shadow:0 2px 4px rgba(0,0,0,.1)}.content-body{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}.venue-card{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 2px 4px rgba(0,0,0,.1);transition:transform .2s;cursor:pointer}.venue-card:hover{transform:translateY(-3px)}.venue-image{width:100%;height:160px;background:#eee;display:flex;align-items:center;justify-content:center;color:#999;background-position:center;object-fit:cover}.venue-image img{width:100%;height:100%;object-fit:cover;transition:opacity .3s}img[data-src]{opacity:0}img:not([data-src]){opacity:1}.venue-info{padding:15px}.venue-name{font-size:16px;font-weight:700;margin-bottom:8px;color:#333}.venue-description{font-size:14px;color:#666;line-height:1.4}.venue-link{text-decoration:none;color:inherit;display:block;transition:all .3s}.пословица{background:#f5f5f5;border-radius:8px;padding:8px;margin:8px auto;box-shadow:0 2px 5px rgba(0,0,0,.1);width:100%;max-width:1300px;transition:all .3s}#quoteDisplay{font-size:1rem;line-height:1.6;color:#000;text-align:center;margin:0}.timer{background:#f5f5f5;border-radius:8px;padding:8px;margin:8px auto;box-shadow:0 2px 5px rgba(0,0,0,.1);width:100%;max-width:1300px;text-align:center;position:relative}iframe{display:block;width:100%;height:365px;box-shadow:0 4px 8px rgba(0,0,0,.1);border-radius:10px}footer{margin-top:auto;padding:20px;background:#f8f9fa;text-align:center}@keyframes fadeIn{from{opacity:0}to{opacity:1}}@media screen and (min-width:1300px){.пословица{padding:10px}#quoteDisplay{font-size:1.4rem}}@media (max-width:1300px){iframe{height:450px}}@media (max-width:1100px){iframe{height:750px}}@media screen and (max-width:991px){.пословица{width:100%;padding:10px}}@media (max-width:768px){.menu-toggle{display:flex}.header-content{padding:0 20px}.sidebar{width:250px;transform:translateX(-100%);transition:transform .3s;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:auto;touch-action:pan-y}.sidebar.active{transform:translateX(0)}.sidebar::-webkit-scrollbar{width:3px}.sidebar::-webkit-scrollbar-thumb{border-radius:1.5px}.main-content{margin-left:0}iframe{height:750px}}@media screen and (max-width:576px){.пословица{width:100%;padding:8px;margin:6px auto}#quoteDisplay{font-size:1rem;line-height:1.4}}@media (max-width:480px){iframe{height:600px}}@media (prefers-color-scheme:dark){*{scrollbar-color:#db91f3 #2d2d2d}::-webkit-scrollbar,::-webkit-scrollbar-track,::-webkit-scrollbar-corner,.sidebar::-webkit-scrollbar,.sidebar::-webkit-scrollbar-track,.sidebar::-webkit-scrollbar-corner{background:#2d2d2d}}
/* ====== 返回顶部按钮样式 ====== */
#backToTop {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 72px;
  height: 72px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(12px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
  cursor: pointer;
  display: none;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: all 0.4s ease;
  z-index: 999;
  overflow: hidden;
  animation: breathing 3s ease-in-out infinite;
}

/* 呼吸闪动 */
@keyframes breathing {
  0%, 100% { box-shadow: 0 0 15px rgba(54 243 178 / 58%); }
  50% { box-shadow: 0 0 25px rgba(184 73 218 / 58%); }
}

/* 图片 */
#backToTop img {
  width: 60%;
  height: 60%;
  object-fit: contain;
  position: absolute;
  z-index: 2;
  transition: transform 0.4s ease;
}

/* 滚动进度环 */
.progress-ring {
  position: absolute;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
  z-index: 1;
}
.progress-ring__background {
  fill: none;
  stroke: rgba(230 157 157 / 32%);
  stroke-width: 8;
}
.progress-ring__circle {
  fill: none;
  stroke: #d786dc;
  stroke-width: 8;
  stroke-dasharray: 283;
  stroke-dashoffset: 283;
  transition: stroke-dashoffset 0.2s ease;
}

/* 显示状态 */
#backToTop.show {
  display: flex;
  opacity: 1;
  animation: fadeInUp 0.4s ease, breathing 3s ease-in-out infinite;
}

/* 悬停动效 */
#backToTop:hover {
  transform: scale(1.08) translateY(-4px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35);
}
#backToTop:hover img {
  transform: translateY(-2px) rotate(-8deg);
}

/* 点击反馈 */
#backToTop:active {
  transform: scale(0.9);
}

/* 出现动画 */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 暗色模式 */
@media (prefers-color-scheme: dark) {
  #backToTop {
    background: rgba(40, 40, 40, 0.6);
  }
  .progress-ring__background {
    stroke: rgba(255, 255, 255, 0.1);
  }
}

/* 手机端优化 */
@media (max-width: 768px) {
  #backToTop {
    width: 60px;
    height: 60px;
    bottom: 25px;
    right: 25px;
  }
}

.back-link {
    display: inline-block;
    margin: 20px 0;
    color: #3498db;
    text-decoration: none;
    font-weight: 500
}

.back-link:hover {
    text-decoration: underline
}