:root {
	font-size:16px;
}

/* Grid
  –––––––––––––––––––––––––––––––––––––––––––––––––– */
  .container {
	position:relative;
	width:100%;
	max-width:37.5rem;     				/* 600px */
    text-align:center;
	margin:0 auto;
	padding:3rem 1.25rem 0 1.25rem;
	box-sizing:border-box;
}
.container-left {
	position:relative;
	width:100%;
	max-width:37.5rem;
	text-align:left;
	margin:0 auto;
	padding:0 1.25rem;
	box-sizing:border-box;
}
.container-left p {
	margin-bottom: 1rem;  				/* 16px space between paragraphs */
  }
.column {
	position:center;
	width:100%;
	float:center;
	box-sizing:border-box;
}
/* For devices larger than 400px */
  @media (min-width:25rem) {            /* 400px */
    .container {
	width:85%;
	padding-left:0;
	padding-right:0;
}
}/* For devices larger than 550px */
  @media (min-width:34.375rem) {        /* 550px */
    .container {
	width:80%;
}
.column,.columns {
	margin-left:0;
}
.column:first-child,.columns:first-child {
	margin-left:0;
}
}

/* Base Styles
  –––––––––––––––––––––––––––––––––––––––––––––––––– */
  body {
	margin:0;
	padding:0;
	background-color:#ffffff;
	color:#1a1a1a;
	font-family:"Open Sans",system-ui;
	font-size:1.125rem;     				/* 18px */
    font-weight:400;
	line-height:1.6;
}

/* Typography
  –––––––––––––––––––––––––––––––––––––––––––––––––– */
  h1 {
	margin:0 0 0.5rem 0;
	font-size:3rem;         		/* 48px */
    font-weight:800;
	line-height:1;
	letter-spacing:0;
	word-wrap:break-word;
	overflow-wrap:break-word;
	hyphens:auto;           		/* Delete this to remove automatic hyphen on line break */
}
.container p {
	margin:0 0 2rem 0;
}

/* Base Typography Settings
–––––––––––––––––––––––––––––––––––––––––––––––––– */
/* Base size - 16px browser default */
:root {
  font-size:16px;           /* Using a 1.25 modular scale for typography */
  --scale-0:1rem;           /* 16px */
  --scale-1:1.25rem;        /* 20px */
  --scale-2:1.563rem;       /* 25px */
  --scale-3:1.953rem;       /* 31px */
  --scale-4:2.441rem;       /* 39px */
  --scale-5:3.052rem;       /* 49px */
  
  /* Spacing units */
  --spacing-xs:0.5rem;      /* 8px */
  --spacing-s:1rem;         /* 16px */
  --spacing-m:1.5rem;       /* 24px */
  --spacing-l:2rem;         /* 32px */
  --spacing-xl:3rem;        /* 48px */
  --spacing-xxl:4rem;       /* 64px */
}

/* Avatar */
.avatar {
	width: 10rem;             /* 128px */
	height: 10rem;
	border-radius: 50%;
	object-fit: cover;
	background-position: center;
	margin-bottom: var(--spacing-l);
	margin-left: auto;
	margin-right: auto;
	display: block;
  }

/* Typography Scale */
h1 {
	margin:0 0 var(--spacing-m) 0;
	font-size:var(--scale-3);           /* ~49px */
  	font-weight:800;
	line-height:1.1;
	letter-spacing:-0.02em;
	word-wrap:break-word;
	overflow-wrap:break-word;
}
body {
	font-size:var(--scale-1);           /* 20px */
  	line-height:1.6;
}
.container p {
	margin:0 0 var(--spacing-xl) 0;
	font-size:var(--scale-1);
	line-height:1.6;
	font-size: 14px;
	color: #999;
}

/* Container spacing */
.container {
	padding:var(--spacing-xl) var(--spacing-m) 0 var(--spacing-m);
	text-align:center;
}

/* Footer */
footer {
	margin:var(--spacing-xxl) 0;            /* 4rem (64px) top and bottom */
    font-size:var(--scale-0);
  bottom: 0; /* 新增 */
  left: 0; /* 新增 */
  width: 100%; /* 新增 */
  padding: 1rem 1.25rem; /* 调整内边距，确保内容不会紧贴边缘 */
  display: flex; /* 新增 */
  flex-direction: column; /* 新增：使子元素垂直排列 */
  align-items: center;   /* 新增：水平居中子元素 */
  justify-content: center; /* 新增：垂直方向上也居中（如果 footer 高度大于内容）*/
  z-index: 999; /* 新增：确保 footer 在页面内容之上，但低于模态框 */
  font-size:var(--scale-0); /* 保持原有字体大小 */
  text-align: center; /* 保持，用于 footer 内 a 标签文本的居中 */
}

/* Responsive adjustments */
@media (max-width:34.375rem) {              /* 550px */
  h1 {
	font-size:var(--scale-4);
}
body {
	font-size:var(--scale-0);
}
.container p {
	font-size:var(--scale-0);
}
.avatar {
	margin-bottom:var(--spacing-m);
}
footer {
	margin:var(--spacing-s) 0;         	/* 3rem (48px) top and bottom */
}
}

/* Links
  –––––––––––––––––––––––––––––––––––––––––––––––––– */
  a {
	text-decoration:none;
	color: #999;
	font-size: 14px;
}
a:hover {
	color:#777;
}

/* Buttons
–––––––––––––––––––––––––––––––––––––––––––––––––– */
.button,button {
	display:inline-flex;
	align-items:center;
	justify-content:center;
	width:18.75rem;             	/* 300px */
 	min-height:3.7rem;                /* 48px */
  	padding:0.75rem 1rem;         	/* 12px ; 16px */
  	font-size:1.125rem;           	/* 18px */
  	font-weight:700;
	text-decoration:none;
	white-space:normal;
  	background-color:var(--button-background,transparent);
	color:var(--button-text,#000000);
	border:var(--button-border,none);
	border-radius:0.5rem;
	cursor:pointer;
	box-sizing:border-box;
	hyphens:auto;               	/* Delete this to remove automatic hyphen on line break */
  	margin-bottom:1rem;
	text-align:center;
	line-height:1.3;
}

/* Icons
–––––––––––––––––––––––––––––––––––––––––––––––––– */
.icon {
	width:2rem;
	height:2em;
	margin-right:1rem;
	flex-shrink:1;
}

/* Avatar
  –––––––––––––––––––––––––––––––––––––––––––––––––– */
.avatar {
	width: 10rem;             /* 128px */
	height: 10rem;
	object-fit: cover;
	background-position: center;
	margin-bottom: var(--spacing-l);
  }

   /* Modifier for no avatar rounding */
   .avatar--none {
	border-radius: 0%;
  }

  /* Modifier for rounded avatar */
  .avatar--rounded {
	border-radius: 50%;
  }
  
  /* Modifier for slightly rounded corners */
  .avatar--soft {
	border-radius: 0.5rem;   /* 8px rounded corners */
  }

/* Theme System
  –––––––––––––––––––––––––––––––––––––––––––––––––– */
/* Light theme is default above */
  
/* Dark theme */
:root.theme-dark {
	color-scheme:dark;
}
:root.theme-dark :focus-visible {
	outline: 2px solid #4899F7;
	outline-offset: 2px;
  }
:root.theme-dark body {
	background-color:#121212;
	color:#ffffff;
}
:root.theme-dark a:not(.button) {
	color:#999;
}
:root.theme-dark a:not(.button):hover {
	color:#fff;
}

/* Auto theme */
:root.theme-auto {
	color-scheme:light dark;
}
@media (prefers-color-scheme:dark) {
	:root.theme-auto body {
	background-color:#121212;
	color:#ffffff;
}
:root.theme-auto :focus-visible {
    outline: 2px solid #4899F7;
    outline-offset: 2px;
  }
:root.theme-auto a:not(.button) {
	color:#4899F7;
}
:root.theme-auto a:not(.button):hover {
	color:#7AB8FF;
}
}

/* Button Text Color Override
    –––––––––––––––––––––––––––––––––––––––––––––––––– */
    .button:hover,button:hover {
	color:var(--button-text);
}

/* Responsive Typography
  –––––––––––––––––––––––––––––––––––––––––––––––––– */
  @media (max-width:34.375rem) {            /* 550px */
    h1 {
	font-size:1.5rem;                         /* 32px */
	}
	body {
	font-size:1rem;                    		/* 16px */
	background: #fafafa;
	}
}

/* Privacy Page Styles
  –––––––––––––––––––––––––––––––––––––––––––––––––– */
nav {
	margin:var(--spacing-l) 0;
	text-align:left;
}
section {
	margin:var(--spacing-xl) 0;
	text-align:left;
}
h2 {
	font-size:var(--scale-3);
	font-weight:700;
	margin-bottom:var(--spacing-m);
}
h3 {
	font-size:var(--scale-2);
	font-weight:600;
	margin:var(--spacing-l) 0 var(--spacing-s) 0;
}
ul {
	list-style:none;
	padding:0;
	margin:0 0 var(--spacing-m) 0;
}
ul li {
	margin-bottom:var(--spacing-xs);
}

/* Privacy page specific responsive adjustments */
  @media (max-width:34.375rem) {
	h2 {
	font-size:var(--scale-2);
	}
	h3 {
	font-size:var(--scale-1);
	}
	section {
	margin:var(--spacing-l) 0;
	}
}
/* 新增 */
      /* --- Theme Toggle Button Styles (灯光按钮) --- */
      .theme-toggle-container {
       
        /* margin-top: 0.5rem;  将由父容器控制间距 */
      }
      .theme-toggle-checkbox,
      .acceleration-toggle-checkbox { /* 合并通用隐藏样式 */
        display: none;
      }
      .theme-toggle-label,
      .acceleration-toggle-label { /* 合并通用标签样式 */
        display: block;
        width: 90px;
        height: 30px;
        border-radius: 15px;
        position: relative;
        cursor: pointer;
        transition: background-color 0.3s ease;
      }
      .theme-toggle-label .theme-toggle-switch,
      .acceleration-toggle-label .acceleration-toggle-switch { /* 合并通用滑块圆点样式 */
        display: block;
        width: 22px;
        height: 22px;
        background-color: white; /* 默认圆点颜色 */
        border-radius: 50%;
        position: absolute;
        top: 4px;
        left: 5px;
        transition: transform 0.3s ease;
        z-index: 1;
      }

      /* 灯光按钮 spécifique */
      .theme-toggle-label {
        background-color: #eee; /* 浅色模式，未选中（开灯状态）时轨道的背景色 */
      }
      .theme-toggle-checkbox:checked + .theme-toggle-label {
        background-color: #0D67D9; /* 浅色模式，选中（关灯状态）时轨道的背景色 */
      }
      .theme-toggle-checkbox:checked + .theme-toggle-label .theme-toggle-switch {
        transform: translateX(58px);
      }
      .theme-toggle-label::before,
      .theme-toggle-label::after {
        content: "";
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        font-size: 12px;
        transition: opacity 0.3s ease, color 0.3s ease;
        z-index: 0;
      }
      .theme-toggle-label::before { content: "夜晚模式"; left: 10px; }
      .theme-toggle-label::after { content: "夜晚模式"; right: 10px; }
      .theme-toggle-checkbox + .theme-toggle-label::before { opacity: 0; color: #333; }
      .theme-toggle-checkbox + .theme-toggle-label::after { opacity: 1; color: #999; }
      .theme-toggle-checkbox:checked + .theme-toggle-label::before { opacity: 1; color: #fff; }
      .theme-toggle-checkbox:checked + .theme-toggle-label::after { opacity: 0; color: #fff; }
      :root.theme-dark .theme-toggle-label { background-color: #555; }
      :root.theme-dark .theme-toggle-checkbox:checked + .theme-toggle-label { background-color: #4899F7; }
      :root.theme-dark .theme-toggle-label .theme-toggle-switch { background-color: #ddd; }
      :root.theme-dark .theme-toggle-checkbox + .theme-toggle-label::before { color: #aaa; }
      :root.theme-dark .theme-toggle-checkbox + .theme-toggle-label::after { color: #fff; }
      :root.theme-dark .theme-toggle-checkbox:checked + .theme-toggle-label::before { color: #fff; }
      :root.theme-dark .theme-toggle-checkbox:checked + .theme-toggle-label::after { color: #a0cfff; }


      /* --- Acceleration Toggle Button Styles (加速按钮) --- */
      .acceleration-toggle-container {
         /* 与主题切换按钮保持一致 */
      }
      /* 加速按钮特定的轨道背景色 */
      .acceleration-toggle-label {
        background-color: #eee; /* 未激活时的轨道背景 */
		margin-left: 1rem;
      }
      .acceleration-toggle-checkbox:checked + .acceleration-toggle-label {
        background-color: #e9643c; /* 激活时的轨道背景 (例如绿色) */
      }
       /* 加速按钮滑块移动 */
      .acceleration-toggle-checkbox:checked + .acceleration-toggle-label .acceleration-toggle-switch {
        transform: translateX(58px);
      }
      /* 加速按钮文字 (使用与灯光按钮相同的伪元素逻辑，但内容不同) */
      .acceleration-toggle-label::before,
      .acceleration-toggle-label::after {
        content: "";
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        font-size: 12px;
        transition: opacity 0.3s ease, color 0.3s ease;
        z-index: 0;
      }
      .acceleration-toggle-label::before { content: "链接加速"; right: 10px; } /* 或 "关闭" */
      .acceleration-toggle-label::after { content: "已开加速"; left: 10px; } /* 或 "开启" */

      /* 加速按钮文字显隐及颜色 - 未选中 (原速) */
      .acceleration-toggle-checkbox + .acceleration-toggle-label::before { opacity: 1; color: #999; } /* 显示 "原速" */
      .acceleration-toggle-checkbox + .acceleration-toggle-label::after { opacity: 0; color: #333; }  /* 隐藏 "加速" */
      /* 加速按钮文字显隐及颜色 - 选中 (加速) */
      .acceleration-toggle-checkbox:checked + .acceleration-toggle-label::before { opacity: 0; color: #fff; } /* 隐藏 "原速" */
      .acceleration-toggle-checkbox:checked + .acceleration-toggle-label::after { opacity: 1; color: #fff; }  /* 显示 "加速" */

      /* 深色模式下的加速按钮特定样式 */
      :root.theme-dark .acceleration-toggle-label {
        background-color: #555; /* 深色模式未激活轨道背景 */
      }
      :root.theme-dark .acceleration-toggle-checkbox:checked + .acceleration-toggle-label {
        background-color: #e9643c; /* 深色模式激活轨道背景 (例如深色友好绿色) */
      }
      :root.theme-dark .acceleration-toggle-label .acceleration-toggle-switch {
          background-color: #ddd; /* 确保圆点在深色模式下可见 */
      }
      /* 深色模式下的加速按钮文字颜色 - 未选中 (原速) */
      :root.theme-dark .acceleration-toggle-checkbox + .acceleration-toggle-label::before { color: #fff; }
      :root.theme-dark .acceleration-toggle-checkbox + .acceleration-toggle-label::after { color: #aaa; }
      /* 深色模式下的加速按钮文字颜色 - 选中 (加速) */
      :root.theme-dark .acceleration-toggle-checkbox:checked + .acceleration-toggle-label::before { color: #a0cfff; } /* 或与背景对比好的颜色 */
      :root.theme-dark .acceleration-toggle-checkbox:checked + .acceleration-toggle-label::after { color: #fff; }

      /* 新增：用于包裹两个切换按钮的容器 */
      .footer-toggles-wrapper {
        display: flex;
        justify-content: center; /* 水平居中两个按钮 */
        /*gap: 1rem;  两个按钮之间的间距 */
        margin-top: 1.75rem; /* 与上方页脚文本的间距 */
      }

/*
* PWA Install Prompt Styles
* –––––––––––––––––––––––––––––––––––––––––––––––– */
#install-prompt,#apk-prompt,#ios-prompt {
  display: none; /* Initially hidden */
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.5);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
  color: var(--button-text, #000);
  box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
  z-index: 2000;
  transition: transform 0.3s ease-in-out;
  transform: translateY(100%); /* Start off-screen */
}
#ozhuyesu-prompt {
  display: none; /* Initially hidden */
  border-radius: 10rem;
  position: fixed;
  top: 2.5%;
  left: 5%;
  width: 90%;
  background: rgba(255, 255, 255, 0.5);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
  color: var(--button-text, #000);
  box-shadow: 0px 10px 20px 5px rgba(0, 0, 0, 0.05);
  z-index: 2000;
  transition: transform 0.3s ease-in-out;
  transform: translateY(100%); /* Start off-screen */
}

#install-prompt[style*="display: block"] {
    transform: translateY(0); /* Slide in */
}
#apk-prompt[style*="display: block"] {
    transform: translateY(0); /* Slide in */
}
#ios-prompt[style*="display: block"] {
    transform: translateY(0); /* Slide in */
}
#ozhuyesu-prompt[style*="display: block"] {
  transform: translateY(0); /* Slide in */
}

.install-prompt-container {
  /* max-width: 600px; Match the main container width */
  margin: 0 auto;
  padding: 1rem 1.25rem;
}

.install-prompt-content {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.install-prompt-icon {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  flex-shrink: 0;
}

.install-prompt-text {
  flex-grow: 1;
  text-align: left;
}

.install-prompt-title {
  font-weight: 700;
  font-size: 1rem;
}

.install-prompt-description {
  font-size: 0.875rem;
  opacity: 0.8;
}

.install-prompt-button {
  background-color: #0d67d9;
  color: #ffffff;
  border: none;
  border-radius: 0.5rem;
  padding: 0.5rem 1rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  margin-bottom: 0rem;
  width: 5rem;
  text-align: center;
}

.install-prompt-button:hover {
  filter: brightness(110%);
}

.install-prompt-close {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--button-text, #000);
  opacity: 0.6;
  cursor: pointer;
  padding: 0 0.5rem;
  width: 2rem;
  margin-bottom: 0rem;
}
.install-prompt-close:hover {
  opacity: 1;
}
/* --- Specific styles for iOS instructional prompt --- */
.ios-instruction-text {
  font-size: 0.9rem;
  line-height: 1.4;
}

.ios-share-icon {
  display: inline-block;
  width: 1.4em;
  height: 1.2em;
  margin: 0 0.2em;
  vertical-align: text-bottom;
  background-image: url('../images/ios-share.png');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}