@charset "UTF-8";

/* --------------------------
   Footer - 精简、去重、修正版
   -------------------------- */

/* 基础变量回退（如果项目已在其他文件定义，这里不会覆盖） */
:root {
  --border-color: rgba(0,0,0,0.06);
  --light: #fff;
  --surface: #ffffff;
  --dark: #111;
  --gray: #6c757d;
  --primary: #007bff;
  --theme-transition: 220ms ease;
}

/* 页脚容器（固定底部） */
.site-footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  box-sizing: border-box;
  width: 100%;
  padding: 14px 0;
  border-top: 1px solid var(--border-color);
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface) 95%, transparent), var(--surface));
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background var(--theme-transition), color var(--theme-transition);
}

/* 内部内容区 */
.footer-content {
  width: min(100%, 1200px);
  padding: 0 1.5rem;
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  box-sizing: border-box;
}

/* 左侧版权 */
.footer-copyright {
  color: var(--gray);
  font-size: 0.875rem;
}
.footer-copyright p {
  margin: 0;
}

/* 中间统计信息 */
.footer-stats {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}
.stat-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--gray);
  font-size: 0.875rem;
}
.stat-item i {
  font-size: 1rem;
  color: var(--primary);
}
.stat-value {
  font-weight: 500;
  color: var(--dark);
}
.stat-label {
  color: var(--gray);
}

/* 右侧社交图标组 */
.footer-links {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}
.footer-icon {
  width: 36px;
  height: 36px;
  background: var(--light);
  color: var(--gray);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 1rem;
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease;
  position: relative;
  border-radius: 30% / 40%;
}
.footer-icon:hover {
  transform: scale(1.15);
  color: #fff;
}

/* 社交悬停颜色（按 title 匹配） */
.footer-icon[title="西风"]:hover {
  background: #002FA7;
}
.footer-icon[title="X"]:hover {
  background: #1DA1F2;
}
.footer-icon[title="GitHub"]:hover {
  background: #24292e;
}
.footer-icon[title="Weibo"]:hover {
  background: #e6162d;
}
.footer-icon[title="YouTube"]:hover {
  background: #ff0000;
}
.footer-icon[title="WeChat"]:hover {
  background: #07c160;
}

/* 微信二维码弹窗 */
.wechat-popup {
  display: none;
  position: absolute;
  bottom: 44px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--light);
  padding: 8px;
  border-radius: 6px;
  width: 140px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.12);
  z-index: 300;
}
.footer-icon.wechat:hover .wechat-popup {
  display: block;
}
.wechat-popup img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

/* footer-right：放置主题切换与回到顶部按钮 */
.footer-right {
  display: inline-flex;
  gap: 8px;
  align-items: center;
}

/* ===========================
   主题切换：Uiverse.io 开关
   From Uiverse.io by Galahhad
   =========================== */

/* 主题切换开关样式 */
.ui-switch {
  /* switch */
  --switch-bg: rgb(135, 150, 165);
  --switch-width: 48px;
  --switch-height: 20px;
  /* circle */
  --circle-diameter: 32px;
  --circle-bg: rgb(0, 56, 146);
  --circle-inset: calc((var(--circle-diameter) - var(--switch-height)) / 2);

  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.ui-switch input {
  display: none;
}

.ui-switch .slider {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  width: var(--switch-width);
  height: var(--switch-height);
  background: var(--switch-bg);
  border-radius: 999px;
  position: relative;
  cursor: pointer;
}

.ui-switch .slider .circle {
  top: calc(var(--circle-inset) * -1);
  left: 0;
  width: var(--circle-diameter);
  height: var(--circle-diameter);
  position: absolute;
  background: var(--circle-bg);
  border-radius: inherit;
  background-image: url("data:image/svg+xml;base64,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");
  background-repeat: no-repeat;
  background-position: center center;
  transition: left 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms, transform 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;
  box-shadow: 0px 2px 1px -1px rgba(0,0,0,0.2), 0px 1px 1px 0px rgba(0,0,0,0.14), 0px 1px 3px 0px rgba(0,0,0,0.12);
}

/* 选中状态 */
.ui-switch input:checked + .slider .circle {
  left: calc(100% - var(--circle-diameter));
  background-image: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIGhlaWdodD0iMjAiIHdpZHRoPSIyMCIgdmlld0JveD0iMCAwIDIwIDIwIj4KICAgIDxwYXRoIGZpbGw9IiNmZmYiCiAgICAgICAgZD0iTTQuMiAyLjVsLS43IDEuOC0xLjguNyAxLjguNy43IDEuOC42LTEuOEw2LjcgNWwtMS45LS43LS42LTEuOHptMTUgOC4zYTYuNyA2LjcgMCAxMS02LjYtNi42IDUuOCA1LjggMCAwMDYuNiA2LjZ6IiAvPgo8L3N2Zz4=");
}

/* 暗色模式调整 */
html[data-theme="dark"] .ui-switch {
  --switch-bg: rgba(255, 255, 255, 0.1);
  --circle-bg: rgb(30, 136, 229);
}

/* 回到顶部按钮（小圆形）*/
.back-to-top {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.06);
  border: none;
  color: inherit;
  cursor: pointer;
  transition: transform 180ms ease, background var(--theme-transition), opacity 220ms ease;
}
.back-to-top:hover {
  transform: translateY(-2px);
  background: rgba(0,0,0,0.08);
}

/* 初始隐藏回到顶部，可由 JS 切换 .visible */
.back-to-top {
  opacity: 0;
  pointer-events: none;
  transform: translateY(6px);
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* 小屏样式：垂直排列，隐藏旧有主题标签文本（若仍有） */
@media (max-width: 768px) {
  .footer-content {
    padding: 0 1rem;
    flex-direction: column;
    gap: 8px;
    text-align: center;
    align-items: center;
  }
  .footer-stats {
    order: 2;
    justify-content: center;
  }
  .footer-links {
    order: 1;
  }
  .footer-right {
    order: 3;
  }
  .theme-toggle-footer .theme-label {
    display: none;
  }
  .footer-icon {
    width: 32px;
    height: 32px;
  }
}

/* 极小屏微调 */
@media (max-width: 480px) {
  .footer-icon {
    width: 28px;
    height: 28px;
    font-size: 0.9rem;
  }
  .footer-stats {
    flex-direction: column;
    gap: 6px;
  }
  .stat-item {
    justify-content: center;
  }
}

/* Dark mode helpers - 主题变量由全局 html[data-theme="dark"] 控制 */
html[data-theme="dark"] {
  /* 继承 header.css 的暗色变量 */
  --footer-bg: rgba(15, 17, 22, 0.95);
  --footer-border: rgba(255, 255, 255, 0.04);
  --footer-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);

  /* 按钮和控件 */
  --btn-bg: rgba(255, 255, 255, 0.03);
  --btn-hover: rgba(255, 255, 255, 0.08);
  --btn-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* 暗色模式样式覆盖 */
html[data-theme="dark"] .site-footer {
  background: var(--footer-bg);
  border-top-color: var(--footer-border);
  box-shadow: var(--footer-shadow);
}

html[data-theme="dark"] .footer-icon {
  background: var(--btn-bg);
  color: var(--gray);
}

html[data-theme="dark"] .footer-icon:hover {
  background: var(--btn-hover);
  box-shadow: var(--btn-shadow);
}

/* Uiverse 开关在暗色下也能通用，无需额外背景覆盖
   如需自定义，可在此调整 slider/circle 颜色 */
html[data-theme="dark"] .back-to-top {
  background: var(--btn-bg);
}
html[data-theme="dark"] .back-to-top:hover {
  background: var(--btn-hover);
}

html[data-theme="dark"] .wechat-popup {
  background: var(--surface);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
  border: 1px solid var(--footer-border);
}