/* ================= 全局样式 ================= */
body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  background: url("images/bg-hero.jpg") no-repeat center center fixed;
  background-size: cover;
  color: #222;
  overflow-x: hidden;
}


/* ================= 顶部导航 ================= */
.topbar { 
  background: black;
  color: white;
  display: flex; 
  justify-content: space-between;   /* 左中右布局 */
  align-items: center;
  padding: 30px 0px;                /* 桌面端厚度 */
  position: fixed;                  /* 固定在页面顶端 */
  top: 0; 
  left: 0; 
  width: 100%; 
  z-index: 20; 
}

/* ================= 中间区域占位 ================= */
.center {
  flex: 1; 
  display: flex;
  justify-content: center;
  align-items: center;
}

/* ================= 导航文字容器 ================= */
.nav {
  text-align: center;
}

/* 小标题（如果有的话） */
.nav-title {
  font-size: 14px;
  margin-bottom: 5px;
}

/* ================= 导航链接 ================= */
.nav-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 30px;                        /* 链接间距（桌面端） */
  justify-content: center;
}

.nav-links a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  font-size: 18px;                  /* 桌面端字体 */
}

.nav-links a:hover {
  text-decoration: underline;
}

/* ================= 响应式调整 ================= */
@media (max-width: 768px) {
  .topbar {
    padding: 15px 0px;              /* 手机端更薄 */
  }

  .nav-links {
    gap: 15px;                      /* 缩小间距 */
  }

  .nav-links a {
    font-size: 14px;                /* 手机端字体更小 */
  }
}

/* ================= 彩点装饰条 ================= */
#dotsCanvas {
  display: block;
  width: 100%;
  height: 40px;
  background: transparent;
}


/* ================= Hero 区域 ================= */
.hero {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 80vh; /* 占满视口高度 */
  text-align: center;
  color: black;
  position: relative;
  z-index: 5;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
}

.hero-sub {
  font-size: 20px;
  margin: 10px 0 20px;
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  background: black;
  color: white;
  text-decoration: none;
  border-radius: 5px;
  font-weight: 500;
}

.btn:hover {
  background: #444;
}


/* ================= 分类区 ================= */
.categories {
  list-style: none;
  padding: 40px;
  margin: 0 auto;
  max-width: 600px;
}

.cat-title {
  font-size: 20px;
  font-family: 'Playfair Display', serif;
  background: none;
  border: none;
  font-weight: bold;
  margin: 10px 0;
  cursor: pointer;
}

.sublinks {
  list-style: none;
  margin-left: 20px;
  display: none;
}

.category:hover .sublinks {
  display: block;
}


/* ================= About & Contact ================= */
.panel {
  padding: 60px;
  text-align: center;
  margin-left: 200px;   /* 或者您想要的任何值，可以是百分比、像素等 */
  margin-right: 200px;
}


.panel h2 {
  font-size: 28px;
  margin-bottom: 20px;
}

/* ================= 竖向循环文字 ================= */
.vertical-text {
  position: fixed;
  top: 0;
  bottom: 0;
  width: 120px;
  display: flex;
  justify-content: center;
  align-items: center;
  pointer-events: none;
  font-family: 'Sen', sans-serif;
  overflow: hidden;
  writing-mode: vertical-lr; /* 改为 vertical-lr */
  text-orientation: mixed;
  font-size: 50px;
  font-weight: 300;
  color: black;
  background: transparent;
  -webkit-font-smoothing: antialiased;
  z-index: 1000;
}

.vertical-text.left  { 
  left: 0; 
  margin-left: 40px;
  transform: ; /* 左侧旋转180度 */
}

.vertical-text.right { 
  right: 0; 
}

.vertical-text .scroller {
  width: 100%;
  height: 200%;
  display: flex;
  flex-direction: column;
  animation: scrollDown 10s linear infinite; /* 统一动画 */
}

.vertical-text .text-item {
  height: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  writing-mode: vertical-lr; /* 改为 vertical-lr */
  text-orientation: upright;
  white-space: nowrap;
  letter-spacing: 6px;
}

@keyframes scrollDown {
  0%   { transform: translateY(0%); }
  100% { transform: translateY(50%); }
}



/* ================= 固定 Logo ================= */
.logo-fixed {
  position: fixed;
  bottom: 20px;
  right: 20px;
  text-align: right;
}

.logo-text {
  font-size: 28px;
  font-weight: 700;
}

.logo-sub {
  display: block;
  font-size: 12px;
  margin-top: 5px;
}

/* ================= 分类区链接样式 ================= */
.sublinks a {
  color: black;              /* 默认黑色 */
  text-decoration: none;     /* 去掉下划线 */
  font-weight: 500;
}

.sublinks a:visited {
  color: black;              /* 点击后仍然是黑色 */
}

.sublinks a:hover {
  color: #555;               /* 悬停时深灰 */
  text-decoration: underline;
}

/* ================= 分类区链接样式 ================= */
.sublinks a {
  color: black;              /* 默认黑色 */
  text-decoration: none;     /* 去掉下划线 */
  font-weight: 500;
}

.sublinks a:visited {
  color: black;              /* 点击后仍然是黑色 */
}

.sublinks a:hover {
  color: #555;               /* 悬停时深灰 */
  text-decoration: underline;
}


/* ================= 手机端优化 ================= */
@media (max-width: 768px) {

  /* 取消 panel 的大边距，文字正常换行 */
  .panel {
    margin-left: 20px;
    margin-right: 20px;
    padding: 20px;
    text-align: left;  /* 手机端更自然 */
  }

  /* Hero 区域文字缩小 */
  .hero-title {
    font-size: 28px;
  }

  .hero-sub {
    font-size: 16px;
  }

  /* 按钮更适合触屏 */
  .btn {
    font-size: 14px;
    padding: 12px 18px;
    display: inline-block;
    margin: 10px auto;
  }

  /* 导航栏竖排显示 */
  .nav-links {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

  .nav-links a {
    font-size: 16px;
  }

  /* 竖向文字在手机端隐藏（不挡内容） */
  .vertical-text {
    display: none;
  }
}