/* 美化增强样式表 - 简约风格 */

/* 全局颜色变量 */
:root {
  --primary-color: #3498db;
  --secondary-color: #2ecc71;
  --accent-color: #e74c3c;
  --text-color: #333333;
  --light-text-color: #666666;
  --background-color: #ffffff;
  --secondary-background: #f8f9fa;
  --border-color: #e0e0e0;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --success-color: #2ecc71;
  --warning-color: #f39c12;
  --error-color: #e74c3c;
}

/* 美化基础元素 */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  padding: 1rem;
  max-width: 100%;
  margin: 0 auto;
}

/* 标题美化 */
h1, h2, h3, h4, h5, h6 {
  margin-top: 1.5rem;
  margin-bottom: 1rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-color);
}

h1 {
  font-size: 1.8rem;
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.3rem;
}

h3 {
  font-size: 1.3rem;
}

/* 段落美化 */
p {
  margin-bottom: 1.2rem;
  text-align: justify;
}

/* 链接美化 */
a {
  color: var(--primary-color);
  text-decoration: none;
  border-bottom: 1px dotted var(--primary-color);
  transition: color 0.2s ease, border-bottom 0.2s ease;
}

a:hover, a:focus {
  color: var(--secondary-color);
  border-bottom: 1px solid var(--secondary-color);
}

/* 列表美化 */
ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
  position: relative;
}

ul li::before {
  content: "•";
  color: var(--primary-color);
  font-weight: bold;
  display: inline-block;
  width: 1em;
  margin-left: -1em;
}

ol {
  counter-reset: item;
}



ol li::before {
  color: var(--primary-color);
  font-weight: bold;
  display: inline-block;
  margin-left: -1.5em;
  margin-right: 0.5em;
}

/* 引用块美化 */
blockquote {
  border-left: 4px solid var(--primary-color);
  padding: 0.5rem 1rem;
  margin: 1.5rem 0;
  background-color: var(--secondary-background);
  border-radius: 0 4px 4px 0;
  font-style: italic;
  color: var(--light-text-color);
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* 代码块美化 */
pre, code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  background-color: var(--secondary-background);
  border-radius: 4px;
}

code {
  padding: 0.2rem 0.4rem;
  font-size: 0.9em;
  color: var(--accent-color);
}

pre {
  padding: 1rem;
  margin: 1.5rem 0;
  overflow-x: auto;
  border: 1px solid var(--border-color);
}

pre code {
  padding: 0;
  color: inherit;
  background-color: transparent;
}

/* 表格美化 */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  overflow-x: auto;
  display: block;
  border-radius: 4px;
  box-shadow: 0 2px 4px var(--shadow-color);
}

.table-responsive {
  margin: 1.5rem 0;
  overflow-x: auto;
  border-radius: 4px;
  box-shadow: 0 2px 4px var(--shadow-color);
}

th, td {
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

th {
  background-color: var(--secondary-background);
  font-weight: 600;
  color: var(--text-color);
}

tr:nth-child(even) {
  background-color: var(--secondary-background);
}

/* 图片美化 */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.5rem auto;
  border-radius: 4px;
  box-shadow: 0 2px 8px var(--shadow-color);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

img:hover {
  transform: scale(1.01);
  box-shadow: 0 4px 12px var(--shadow-color);
}

.responsive-img {
  max-width: 100%;
  height: auto;
}

/* 导航菜单美化 */
.nav-toggle {
  display: block;
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 50%;
  width: 3rem;
  height: 3rem;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 2px 5px var(--shadow-color);
  transition: background-color 0.3s ease, transform 0.3s ease;
}

.nav-toggle:hover {
  background: var(--secondary-color);
  transform: scale(1.05);
}

.nav-menu {
  position: fixed;
  top: 0;
  left: -100%;
  width: 80%;
  height: 100%;
  background: var(--background-color);
  box-shadow: 2px 0 10px var(--shadow-color);
  transition: left 0.3s ease;
  z-index: 999;
  overflow-y: auto;
  padding: 4rem 1rem 1rem;
}

.nav-menu ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-menu li {
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.nav-menu li::before {
  display: none;
}

.nav-menu a {
  display: block;
  padding: 0.75rem 0;
  color: var(--text-color);
  border-bottom: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.nav-menu a:hover {
  color: var(--primary-color);
  padding-left: 0.5rem;
  border-bottom: none;
}

.nav-menu.active {
  left: 0;
}

.nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 998;
  display: none;
  backdrop-filter: blur(2px);
}

.nav-overlay.active {
  display: block;
}

/* 返回顶部按钮美化 */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--primary-color);
  color: white;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  opacity: 0;
  transition: opacity 0.3s ease, background-color 0.3s ease, transform 0.3s ease;
  z-index: 99;
  font-size: 1.5rem;
  box-shadow: 0 2px 5px var(--shadow-color);
  border-bottom: none;
}

.back-to-top:hover {
  background: var(--secondary-color);
  transform: scale(1.05);
  border-bottom: none;
}

.back-to-top.visible {
  opacity: 1;
}

/* iframe响应式容器美化 */
.iframe-responsive {
  position: relative;
  overflow: hidden;
  padding-top: 56.25%; /* 16:9 比例 */
  margin: 1.5rem 0;
  border-radius: 4px;
  box-shadow: 0 2px 8px var(--shadow-color);
}

.iframe-responsive iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* 暗色模式切换按钮 */
.dark-mode-toggle {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  background: var(--primary-color);
  color: white;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  box-shadow: 0 2px 5px var(--shadow-color);
  transition: background-color 0.3s ease, transform 0.3s ease;
  z-index: 99;
}

.dark-mode-toggle:hover {
  background: var(--secondary-color);
  transform: scale(1.05);
}

/* 暗色模式样式 */
body.dark-mode {
  --text-color: #f0f0f0;
  --light-text-color: #cccccc;
  --background-color: #121212;
  --secondary-background: #1e1e1e;
  --border-color: #333333;
  --shadow-color: rgba(0, 0, 0, 0.3);
}

/* 动画效果 */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.container {
  animation: fadeIn 0.5s ease-in-out;
}

/* 媒体查询优化 */
@media (min-width: 768px) {
  .container {
    padding: 2rem;
  }
  
  h1 {
    font-size: 2.2rem;
  }
  
  h2 {
    font-size: 1.8rem;
  }
  
  h3 {
    font-size: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: 960px;
    padding: 2rem 0;
  }
  
  .nav-toggle, .nav-overlay {
    display: none;
  }
  
  .nav-menu {
    position: static;
    width: auto;
    height: auto;
    box-shadow: none;
    background: transparent;
    padding: 0;
    overflow: visible;
  }
  
  .nav-menu ul {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
  }
  
  .nav-menu li {
    margin: 0 1rem;
    border-bottom: none;
  }
  
  .nav-menu a {
    padding: 0.5rem;
  }
  
  .nav-menu a:hover {
    padding-left: 0.5rem;
  }
}

@media (min-width: 1280px) {
  .container {
    max-width: 1140px;
  }
}

/* 打印样式优化 */
@media print {
  .nav-toggle, .nav-menu, .back-to-top, .dark-mode-toggle {
    display: none !important;
  }
  
  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }
  
  a {
    color: #000;
    text-decoration: underline;
    border-bottom: none;
  }
  
  img {
    max-width: 100% !important;
    box-shadow: none;
  }
  
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
    page-break-inside: avoid;
  }
  
  p, blockquote, ul, ol, dl, table {
    page-break-inside: avoid;
  }
  
  table {
    display: table;
    width: 100%;
    box-shadow: none;
  }
}