:root {
  --bg: #ffffff;
  --fg: #000000;
  --line: #000000;
  --muted: #6b6b6b;
  --soft: #f4f4f4;
  --font-mono: "Fusion Pixel 12px Proportional Simplified Chinese",
    "Fusion Pixel 12px Proportional Latin", ui-monospace, SFMono-Regular, Consolas,
    "Microsoft YaHei", monospace;
  --font-pixel-mono: "Fusion Pixel 12px Monospaced Latin", ui-monospace, SFMono-Regular, Consolas,
    monospace;
}

[data-theme="dark"] {
  --bg: #000000;
  --fg: #ffffff;
  --line: #ffffff;
  --muted: #a2a2a2;
  --soft: #171717;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-mono);
}

a {
  color: inherit;
}

/* 上栏 */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  background: var(--bg);
  border-bottom: 2px solid var(--line);
}

.tabs {
  display: flex;
}

.tab {
  display: inline-block;
  padding: 5px 14px;
  font-size: 16px;
  line-height: 24px;
  text-decoration: none;
  border: 2px solid var(--line);
  border-right: none;
  white-space: nowrap;
}

.tab:last-child {
  border-right: 2px solid var(--line);
}

.tab.active {
  background: var(--line);
  color: var(--bg);
}

.theme-toggle,
.sort-toggle {
  margin-left: auto;
  padding: 5px 14px;
  font-family: inherit;
  font-size: 14px;
  line-height: 24px;
  color: var(--fg);
  background: var(--bg);
  border: 2px solid var(--line);
  cursor: pointer;
  white-space: nowrap;
}

.theme-toggle:hover,
.sort-toggle:hover {
  background: var(--soft);
}

.sort-toggle {
  margin-left: 0;
}

/* 内容区 */
.wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 28px 16px 64px;
}

/* 列表工具栏 */
.list-bar {
  display: flex;
  gap: 8px;
  align-items: stretch;
  justify-content: flex-end;
  margin-bottom: 12px;
}

.search-box {
  position: relative;
  display: flex;
  flex: 1 1 auto;
  min-width: 0;
}

.search-input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 5px 10px;
  font-family: inherit;
  font-size: 14px;
  line-height: 24px;
  color: var(--fg);
  background: var(--bg);
  border: 2px solid var(--line);
}

.search-input::placeholder {
  color: var(--muted);
  opacity: 1;
}

.search-input:focus {
  outline: none;
  background: var(--soft);
}

.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 20;
  margin-top: 4px;
  max-height: 320px;
  overflow-y: auto;
  background: var(--bg);
  border: 2px solid var(--line);
}

.search-results[hidden] {
  display: none;
}

.search-item {
  display: block;
  padding: 8px 10px;
  text-decoration: none;
  border-bottom: 2px solid var(--line);
}

.search-item:last-child {
  border-bottom: none;
}

.search-item:hover,
.search-item.is-active {
  background: var(--soft);
}

.search-item-title {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
}

.search-item-snippet {
  display: block;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.search-empty {
  margin: 0;
  padding: 10px;
  color: var(--muted);
  font-size: 14px;
}

/* 文章列表 */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.post-card {
  border: 2px solid var(--line);
}

.post-card-link {
  display: flex;
  gap: 20px;
  padding: 16px;
  text-decoration: none;
}

.post-card-link:hover {
  background: var(--soft);
}

.post-card-main {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  min-width: 0;
}

.post-card-title {
  margin: 0 0 10px;
  font-size: clamp(20px, 3.6vw, 28px);
  line-height: 1.35;
  word-break: break-word;
}

.post-card-excerpt {
  margin: 0;
  color: var(--muted);
  font-size: clamp(14px, 2.4vw, 16px);
  line-height: 1.7;
  word-break: break-word;
}

.post-card-date {
  align-self: flex-end;
  margin-top: 16px;
  color: var(--muted);
  font-size: 14px;
}

.post-card-cover {
  flex: 0 0 180px;
  width: 180px;
}

.post-card-cover img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 120px;
  object-fit: cover;
}

/* 文章详情 / 独立页 */
.post-title,
.page-title {
  margin: 0 0 10px;
  font-size: clamp(24px, 5vw, 36px);
  line-height: 1.3;
  word-break: break-word;
}

.post-date {
  display: block;
  margin-bottom: 28px;
  color: var(--muted);
  font-size: 14px;
}

.post-content {
  font-size: 16px;
  line-height: 1.9;
  word-break: break-word;
}

.post-content h2 {
  margin: 36px 0 12px;
  padding-bottom: 6px;
  font-size: 22px;
  border-bottom: 2px solid var(--line);
}

.post-content h3 {
  margin: 28px 0 10px;
  font-size: 18px;
}

.post-content p {
  margin: 0 0 16px;
}

.post-content ul,
.post-content ol {
  margin: 0 0 16px;
  padding-left: 26px;
}

.post-content li {
  margin-bottom: 6px;
}

.post-content a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.post-content blockquote {
  margin: 0 0 16px;
  padding: 4px 16px;
  color: var(--muted);
  border-left: 6px solid var(--line);
}

/* 代码用等宽的像素字体，保证字符对齐 */
.post-content code,
.post-content pre,
.post-content pre code {
  font-family: var(--font-pixel-mono);
}

.post-content code {
  padding: 2px 5px;
  background: var(--soft);
  border: 1px solid var(--line);
}

.post-content pre {
  margin: 0 0 16px;
  padding: 14px;
  overflow-x: auto;
  background: var(--soft);
  border: 2px solid var(--line);
}

.post-content pre code {
  padding: 0;
  background: none;
  border: none;
}

.post-content table {
  width: 100%;
  margin: 0 0 16px;
  font-size: 15px;
  border-collapse: collapse;
}

.post-content th,
.post-content td {
  padding: 8px 10px;
  text-align: left;
  border: 2px solid var(--line);
}

.post-content th {
  background: var(--soft);
}

.post-content hr {
  margin: 28px 0;
  border: none;
  border-top: 2px solid var(--line);
}

.post-content figure {
  margin: 0 0 16px;
}

/* 上一篇 / 下一篇 */
.post-nav {
  display: flex;
  gap: 16px;
  justify-content: space-between;
  margin-top: 40px;
  padding-top: 16px;
  font-size: 15px;
  border-top: 2px solid var(--line);
}

.post-nav a {
  text-decoration: underline;
}

.post-nav .next {
  margin-left: auto;
}

/* 分页 */
.page-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 32px;
  font-size: 15px;
}

.page-nav a,
.page-nav span {
  padding: 4px 10px;
  text-decoration: none;
  border: 2px solid var(--line);
}

.page-nav .current {
  background: var(--line);
  color: var(--bg);
}

/* 空状态 */
.empty {
  color: var(--muted);
  font-size: 16px;
}

/* 小屏适配 */
@media (max-width: 640px) {
  .topbar {
    padding: 8px 12px;
  }

  .tab,
  .theme-toggle,
  .sort-toggle {
    padding: 4px 10px;
    font-size: 13px;
  }

  .search-input {
    padding: 4px 8px;
    font-size: 13px;
  }

  .wrap {
    padding: 20px 12px 48px;
  }

  /* 窄屏也保持"左文右图"，只是把缩略图收窄一点，给文字留出空间 */
  .post-card-link {
    gap: 12px;
    padding: 12px;
  }

  .post-card-cover {
    flex: 0 0 104px;
    width: 104px;
  }

  .post-card-cover img {
    min-height: 96px;
  }
}

/* 彩蛋：连点主题按钮时的掉落层 */
.egg-layer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 50;
  overflow: hidden;
  pointer-events: none;
}

.egg-item {
  position: absolute;
  top: 0;
  left: 0;
  will-change: transform;
}

.egg-sprite {
  display: block;
  width: 100%;
  height: 100%;
  transform-origin: center center;
  user-select: none;
  -webkit-user-drag: none;
}

/* 个人名片页（关于页） */
.profile {
  text-align: center;
}

.profile-avatar {
  display: block;
  width: 160px;
  height: 160px;
  margin: 0 auto 24px;
  object-fit: cover;
  border: 2px solid var(--line);
  border-radius: 50%;
}

.profile-name {
  margin: 0 0 20px;
  font-size: clamp(28px, 6vw, 40px);
  line-height: 1.3;
}

.profile-bio {
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.9;
  text-align: left;
}

.profile-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  margin: 0 0 44px;
  padding: 0;
  list-style: none;
  font-size: 15px;
}

.profile-links a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.profile-projects {
  text-align: left;
}

.profile-projects h2 {
  margin: 0 0 20px;
  padding: 0;
  font-size: 22px;
  text-align: center;
  border-bottom: none;
}

.project-card {
  margin-bottom: 16px;
  padding: 16px;
  border: 2px solid var(--line);
}

.project-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
}

.project-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

@media (max-width: 640px) {
  .profile-avatar {
    width: 130px;
    height: 130px;
    margin-bottom: 18px;
  }

  .project-card {
    padding: 14px;
  }
}

/* ==================== 页面切换与滚动动效 ==================== */

/*
  入场动画（html.nav-enter-forward / nav-enter-back）写在 layout.ejs 的 <head> 内联样式里，
  这样新页面第一帧就带着动画，不会出现"先正常画出来、CSS 到了才突然消失再滑入"的闪烁。
*/

/* 离场：点击站内链接时内容区先滑出去 */
body.nav-leave-forward .wrap {
  animation: wrap-out-to-left 200ms cubic-bezier(0.4, 0, 1, 1) both;
}

body.nav-leave-back .wrap {
  animation: wrap-out-to-right 200ms cubic-bezier(0.4, 0, 1, 1) both;
}

@keyframes wrap-out-to-left {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(-38px);
  }
}

@keyframes wrap-out-to-right {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(38px);
  }
}

/*
  打开文章时的"容器扩展"层：从卡片矩形连续放大到整页。
  这是离场侧的样式；新页面侧的同一套样式内联在 <head>，保证首帧就位。
*/
.card-expander {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 300;
  background: var(--bg);
  border: 2px solid var(--line);
  transform-origin: top left;
  pointer-events: none;
  will-change: transform;
}

/* 文章卡片：滚动进入视口时向上归位，逐张错开 */
.js-anim .post-card {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 480ms ease, transform 480ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.js-anim .post-card.is-in {
  opacity: 1;
  transform: none;
}

/* 系统开启"减少动态效果"时全部关掉 */
@media (prefers-reduced-motion: reduce) {
  html.nav-enter-forward .wrap,
  html.nav-enter-back .wrap,
  body.nav-leave-forward .wrap,
  body.nav-leave-back .wrap {
    animation: none;
  }

  .js-anim .post-card {
    opacity: 1;
    transform: none;
    transition: none;
  }

}

/*
  深浅色切换：切换瞬间给 <html> 挂上 .theme-fading，
  让它下面所有元素的颜色在 320ms 内渐变过去，而不是硬切。
*/
html.theme-fading,
html.theme-fading * {
  transition: background-color 380ms ease-in-out, color 380ms ease-in-out,
    border-color 380ms ease-in-out !important;
}

@media (prefers-reduced-motion: reduce) {
  html.theme-fading,
  html.theme-fading * {
    transition: none !important;
  }
}

/* ==================== 页脚 ==================== */

.site-footer {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px 16px 40px;
  border-top: 2px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  line-height: 24px;
  text-align: center;
}

.site-footer a {
  color: inherit;
  text-decoration: none;
  border-bottom: 2px solid currentColor;
}

.site-footer a:hover {
  color: var(--bg);
  background: var(--fg);
}