/* base.css — 全站基础：主题变量、基础布局、导航、页脚、Toast、回到顶部、通用工具。
   由 style.css 按规则拆分而来；所有页面都按 base→home→blog→post→admin→site 顺序加载全部文件，顺序不要调换。改了任何 css 文件后全站 ?v= 一起 +1。 */

/* --- 1. 变量与主题定义（浅色 = 淡蓝底 + 白卡片） --- */
:root {
  --bg-color: #08090b;
  --card-bg: #17181b;
  --card-hover: #2c2c2e;
  --text-primary: #f5f5f7;
  --text-secondary: #a1a1a8;
  --nav-bg: rgba(8, 9, 11, 0.82);
  --border-color: rgba(255, 255, 255, 0.12);
  --accent-color: #58b5ff;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[data-theme="light"] {
  color-scheme: light;
  /* 底色从原来的 #eaf6f7（近乎白的青）换成明确一点的淡蓝。
     原因：卡片是白的（--card-bg 约等于 #fff），底色一旦也接近白，
     卡片和页面之间就没有分界线，整个首页看起来是"糊"在一起的一片白。
     拉开这层明度差之后，白卡片才立得起来。改这个值前先想清楚这一点。 */
  --bg-color: #dce8f7;
  --card-bg: rgba(255, 255, 255, 0.92);
  --card-hover: #ffffff;
  --text-primary: #1d1d1f;
  --text-secondary: #45535b;
  --nav-bg: rgba(220, 232, 247, 0.88);
  --border-color: rgba(21, 46, 55, 0.14);
  --accent-color: #006ba7;
}

/* --- 2. 基础布局 --- */
html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
  margin: 0;
  padding: 0;
  transition:
    background-color 0.4s ease,
    color 0.4s ease;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* --- 3. 导航栏 --- */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 0;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-links > a,
.nav-links > button {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  line-height: 1;
}

.nav-links > a {
  margin-left: 0;
}

.nav-links > button {
  margin-left: 10px;
}

/* 跳至正文（键盘用户专用的可达性入口，聚焦时才出现） */
.skip-link {
  position: fixed;
  top: -64px;
  left: 20px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--card-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 0 0 14px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.25);
  transition: top 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.skip-link:focus-visible {
  top: 0;
  outline: 2px solid var(--accent-color);
  outline-offset: -2px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 6px;
}

.logo-svg {
  height: 60px;
  width: auto;
  display: block;
}

.logo a {
  color: var(--text-primary);
  text-decoration: none;
  border: none;
  transition: opacity 0.2s;
}

.logo span {
  color: var(--text-secondary);
}

.logo-icon {
  display: inline-flex;
  align-items: center;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: background 0.2s;
}

.logo-icon:hover {
  background: rgba(128, 128, 128, 0.15);
}

.logo-icon svg {
  display: block;
}

/* 下拉菜单容器 */
.menu-wrapper {
  position: relative;
}

/* 下拉菜单 */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  min-width: 176px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 6px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: opacity 0.2s, transform 0.2s;
  z-index: 300;
}

.nav-dropdown.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.nav-dropdown-link {
  display: block;
  padding: 10px 14px;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 8px;
  transition: background 0.15s;
}

.nav-dropdown-link:hover {
  background: rgba(128, 128, 128, 0.1);
}

.nav-dropdown-link[aria-current="page"] {
  background: color-mix(in srgb, var(--accent-color), transparent 90%);
  color: var(--accent-color);
}

.logo a:hover {
  opacity: 0.6;
  color: var(--text-primary);
}

.logo span {
  color: var(--text-secondary);
}

/* --- 4. Bento Grid 核心系统 --- */
.container {
  max-width: 1200px;
  margin: 100px auto 50px;
  padding: 20px;
}

/* 淡入效果 */
.fade-in {
  opacity: 0;
  transform: translateY(8px);
  animation: fadeInUp 520ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 滚动入场：由 theme-init.js 在首次绘制前打上的 has-reveal 类启用（细节见 reveal.js 注释）。
   类不存在时上面那条 .fade-in 就是唯一行为——加载即播、内容始终可见，
   所以 JS 失效或用户要求减少动效都不会把内容藏起来。 */
.has-reveal .fade-in {
  opacity: 0;
  transform: translateY(14px);
  animation: none;
}

.has-reveal .fade-in.is-revealed {
  animation: fadeInUp 520ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

/* Toast 通知 */
.toast-notification {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: 28px;
  background: rgba(0, 0, 0, 0.85);
  color: #fff;
  padding: 10px 16px;
  border-radius: 12px;
  font-size: 0.95rem;
  z-index: 9999;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  transition:
    transform 180ms ease,
    opacity 180ms ease;
}

.toast-notification.fade-out {
  opacity: 0;
  transform: translateX(-50%) translateY(8px);
}

.delay-01 { animation-delay: 0.1s; }

.delay-02 { animation-delay: 0.2s; }

.delay-03 { animation-delay: 0.3s; }

.delay-04 { animation-delay: 0.4s; }

.delay-05 { animation-delay: 0.5s; }

.delay-06 { animation-delay: 0.6s; }

.delay-07 { animation-delay: 0.7s; }

/* 导航主题切换按钮 */
.nav-theme-toggle {
  font-size: 1.2rem;
  margin-left: 10px;
  text-decoration: none;
  background: transparent;
  border: none;
  color: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 8px;
}

.nav-theme-toggle:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 3px;
}

.theme-icon-img {
  width: 24px;
  height: 24px;
  display: inline-block;
  vertical-align: middle;
}

.icon-sun {
  display: inline-block;
  filter: invert(1);
}

.icon-moon {
  display: none;
}

/* 屏幕阅读器专用——业界标准写法，!important 是必须的 */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* 头像呼吸灯 */
@keyframes avatar-breathe {
  0%,
  100% {
    box-shadow: 0 0 8px rgba(41, 151, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.2);
  }
  50% {
    box-shadow: 0 0 25px rgba(41, 151, 255, 0.7);
    border-color: rgba(41, 151, 255, 0.5);
  }
}

/* 3. 浅色模式主题图标切换 */
[data-theme="light"] .icon-sun {
  display: none;
}

[data-theme="light"] .icon-moon {
  display: inline-block;
  filter: none;
}

/* 4. 悬停旋转特效 */
.nav-theme-toggle:hover .theme-icon-img {
  transform: rotate(30deg) scale(1.1);
  filter: invert(1) drop-shadow(0 0 5px rgba(255, 255, 255, 0.8));
}

[data-theme="light"] .nav-theme-toggle:hover .theme-icon-img {
  filter: drop-shadow(0 0 5px rgba(0, 0, 0, 0.2));
  transform: rotate(-30deg) scale(1.1);
}

/* --- Email 卡片尺寸一致性 --- */

* {
  box-sizing: border-box;
}

/* =========================================
   手机端强制适配
   ========================================= */
@media (max-width: 768px) {

  .nav-container {
    padding: 0 15px;
  }
  .logo a {
    font-size: 1.1rem;
  }
}

/* =========================================
   手机端强制适配
   ========================================= */
@media (max-width: 768px) {

  html,
  body {
    overflow-x: hidden;
    width: 100%;
    position: relative;
  }
}

/* 回到顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 99;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 0.3s, transform 0.3s;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent-color);
  color: #fff;
  border-color: var(--accent-color);
}

@media (prefers-reduced-motion: reduce) {

  html {
    scroll-behavior: auto;
  }

  .fade-in {
    animation: none !important;
    opacity: 1;
    transform: none;
  }
}