/* Intro region */
.intro-section {
  background: linear-gradient(145deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  padding: 2rem 1.5rem;
  border-left: 4px solid #0097C9;
  border-radius: 8px;
  max-width: 1000px;
  margin: 2rem auto;
  line-height: 1.7;
  font-size: 1.05rem;
  color: #EEE;
}

.intro-section h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: #23DAFA;
  text-align: left;
}

.intro-section p {
  margin-bottom: 1rem;
  text-align: justify;
  color: #32FAD5
}

/* sub-pages format */
.sub-container {
  background: linear-gradient(145deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  max-width: 1000px;
  margin: 2rem auto;
  padding: 2rem 1.5rem;
  border-radius: 10px;
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.06);
  color: #DFF;
  /*display: block;*/       
}


.sub-container h1 {
  color: #23DAFA;
  margin-top: 2rem;
  font-size: 2rem;     
  text-align: center;   
}


.sub-container h2 {
  color: #23DAFA;
  margin-top: 2rem;
}

.sub-container p {
  color: #A7FDEB;
  line-height: 1.7;
  text-align: justify;
}

.sub-container a {
  color: #23DAFA;        
  text-decoration: underline;  
}

.sub-container .tcolorbox a {
  color: #32FAD5;
  text-decoration: underline;
}


.tagline {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
  line-height: 1.7;
  font-size: 1rem;
  text-align: left; /* 取消 text-align: center */
}



.logo-container {
  display: block;  
  text-align: center;
  margin: 2rem auto;
  padding: 1rem;
  background: linear-gradient(135deg, #0F2027, #203A43, #2C5364);
  border-radius: 8px;
  max-width: 220px;    /* 根据 logo 大小微调 */
}

.logo {
  max-width: 200px;
  width: 100%;
  display: inline-block;
}

/* background */
body {
  margin: 0;
  padding: 0;
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #0F2027, #203A43, #2C5364);
  color: #FFF;
  overflow-x: hidden;
}

/* drawer */
.drawer {
  position: fixed;
  top: 0; right: 0;
  width: 0;
  height: 100vh;
  background: rgba(15, 32, 39, 0.95);
  overflow: hidden;
  transition: width 0.3s ease;
  z-index: 1000;
  padding-top: 60px;
}
.drawer.open {
  width: 375px;
}
.drawer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.drawer li {
  margin: 20px;
}
.drawer a {
  color: #23DAFA;
  text-decoration: none;
  font-size: 18px;
}

/* 抽屉开关按钮 */
.drawer-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  font-size: 28px;
  background: none;
  border: none;
  color: #FFF;
  cursor: pointer;
  z-index: 1100;
}


/* 90% width */
.img-wrap {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  max-width: 90%;
  margin: 1.5rem auto;
}
.img-wrap img {
  max-width: 100%;
  height: auto;
}
/* stack  */
.img-wrap.stack {
  flex-direction: column;
}

/* cell phone view */
@media (max-width: 600px) {
  .drawer.open { width: 370px; }

  /* 所有圖片在手機上 100% 寬度 */
  .img-wrap img,
  .gif-border,
  .gif-border-intro {
    width: 100% !important;
    max-width: 100% !important;
  }
}

/* Dropdown submenu inside drawer */
.drawer ul li {
  position: relative;
}

.drawer ul li .submenu {
  display: none;
  margin-top: 5px;
  margin-left: 10px;
  padding-left: 10px;
  border-left: 2px solid #23DAFA;
}

.drawer ul li:hover .submenu {
  display: block;
}

.drawer ul li .submenu li {
  margin: 10px 0;
}

.gif-container {
  text-align: center;  /* 父容器文本居中 */
}

.gif-border-intro {
  width: 65%;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 8px;
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.2), 
              0 0 30px rgba(255, 255, 255, 0.1);
}

.gif-border {
  max-width: 85%;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 8px;
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.2), 
              0 0 30px rgba(255, 255, 255, 0.1);
}

.math-block {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  border-left: 3px solid #23DAFA;
  background: rgba(255,255,255,0.02);
  border-radius: 4px;
  text-align: center;
}

.alg-block {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0.1rem;
  margin: 0.25rem 0;               /* 竖直间距改小 */
  border: 3px solid #23DAFA;      /* 四边都要线 */
  background: rgba(255,255,255,0.02);
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  white-space: pre;
  text-align: left;
  line-height: 1.0;               /* 缩小空行距离 */
}


/* 容器：只负责定位按钮和留白 */
.code-copy-container {
  position: relative;
  margin: 0.5rem 0;       /* 上下间距 */
  padding: 1rem;          /* 四边留白 */
  max-width: 100%;
  box-sizing: border-box;
  background: rgba(0, 0, 0, 0.1);       /* 半透明深色底 */
  border: 2px dashed #23DAFA;           /* 浅色虚线边框 */
}

/* 滚动区：真正的横向滚动 */
.code-copy-container .code-scroll {
  overflow-x: auto;
  overflow-y: hidden;     /* 隐藏垂直滚动 */
  -webkit-overflow-scrolling: touch;
  background: rgba(255, 255, 255, 0.05); /* 半透明浅色底 */
  border-radius: 4px;
  padding: 0.5rem;
}

/* 保证 <pre> 至少和容器同宽，滚动才会生效 */
.code-copy-container .code-scroll pre {
  display: block;
  min-width: 100%;
  margin: 0;              /* 去掉默认 <pre> 外边距 */
  padding: 0;             /* 内边距统一给外层处理 */
  white-space: pre;       /* 保留缩进和换行 */
  font-family: 'Courier New', monospace;
  box-sizing: border-box;
  background: transparent;
}

/* 固定定位按钮 */
.code-copy-container .copy-btn {
  z-index: 10;
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: #23DAFA;
  border: none;
  color: #0F2027;
  padding: 0.2rem 0.5rem;
  font-size: 0.8rem;
  border-radius: 4px;
  cursor: pointer;
  opacity: 0.8;
}
.code-copy-container .copy-btn:hover {
  opacity: 1;
}

/* 可选：WebKit 浏览器下去掉竖向滚动条的小轨道 */
.code-copy-container .code-scroll::-webkit-scrollbar:vertical {
  z-index: 0; display: none;
}
/* recover <code> </code> shrinking issue */
/* 全局保留不动 */
code {
  font-size: inherit ;
  line-height: inherit;
}
/* 子页强制覆盖 */
.sub-container code {
  font-size: 1rem;
  line-height: 1.4;
}




/* 目录大纲样式: decomposition page */
.outline-list {
  list-style: none;
  padding-left: 0;
  margin: 1rem 0 2rem;
}
.outline-list li {
  margin: 0.5rem 0;
}
.outline-list a {
  color: #23DAFA;
  text-decoration: underline;
  font-weight: 500;
}

/* reference */
.reference-list {
  list-style: none;
  padding-left: 0;
  margin: 1rem 0 2rem;
  font-size: 0.9rem;       /* 略小于正文 */
  line-height: 1.4;        /* 行距稍密 */
}
.reference-list li {
  position: relative;
  padding-left: 1.5em;     
  margin: 0.5rem 0;
}
.reference-list li::before {
  content: counter(ref)".";
  counter-increment: ref;
  position: absolute;
  left: 0;
  color: #23DAFA;
  font-weight: bold;
}
section#references {
  counter-reset: ref;       /* 重置引用编号 */
}


/* for input files */
.input-list {
  list-style: none;
  counter-reset: inputRef;
  padding-left: 0;
  margin: 1rem 0 2rem;
}
.input-list li {
  position: relative;
  padding-left: 1.5em;
  counter-increment: inputRef;
  margin: 0.5rem 0;
}
.input-list li::before {
  content: counter(inputRef) ".";
  position: absolute;
  left: 0;
  color: #23DAFA;
  font-weight: bold;
}



/* ==== 左图右表等高布局 ==== */
/* 容器：大屏左右并排，手机上下堆叠 */
.flex-table {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  margin: 2rem 0;
}

/* 左侧图 */
.flex-table .flex-image {
  flex: 1 1 45%;
  text-align: center;
}
.flex-table .flex-image img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 0 15px rgba(0,0,0,0.3);
}
.flex-table .figure-caption {
  margin-top: 0.5rem;
  color: #23DAFA;
  font-size: 0.9rem;
}

/* 右侧表格 */
.flex-table .flex-data {
  flex: 1 1 55%;
  overflow-x: auto; /* 防止极端长表在小视窗下溢出 */
}
.flex-table .flex-data table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(255,255,255,0.05);
  color: #E0F7FA;
}
.flex-table .flex-data th,
.flex-table .flex-data td {
  padding: 0.5rem 0.75rem;
  border: 1px solid rgba(255,255,255,0.15);
  text-align: left;
}
.flex-table .flex-data th {
  background: rgba(35,218,250,0.2);
  color: #FFF;
  font-weight: 600;
}
.flex-table .flex-data tr:nth-child(even) td {
  background: rgba(255,255,255,0.02);
}

/* 手机端：上下堆叠 */
@media (max-width: 600px) {
  .flex-table {
    flex-direction: column;
  }
  .flex-table .flex-image,
  .flex-table .flex-data {
    flex: none;
    width: 100%;
  }
}