:root {
  --bg-color: #ffffff;
  --text-color: #333333;
  --link-color: #0066cc;
  --border-color: #eeeeee;
  --header-height: 60px;
  --hover-bg: #f5f5f5;
  --accent-color: #347df8;
  --meta-color: #888888;
}

[data-theme="dark"] {
  --bg-color: #1a1a1a;
  --text-color: #e0e0e0;
  --link-color: #5aa9fa;
  --border-color: #333333;
  --hover-bg: #2a2a2a;
  --meta-color: #aaaaaa;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
  /* 防止通栏图片导致的水平滚动条 */
  overflow-x: hidden; 
}

a { color: var(--link-color); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Wrapper */
.wrapper {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  height: var(--header-height);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  background-color: var(--bg-color); 
  z-index: 100;
  display: flex;
  align-items: center;
}
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}
.site-title {
  font-weight: bold;
  font-size: 1.2rem;
  color: var(--text-color);
}
.header-controls {
  display: flex;
  gap: 15px;
  align-items: center;
}
.nav-link {
  color: var(--text-color);
  font-size: 0.9rem;
}

/* Toggles */
.toggle-btn {
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
}
.toggle-btn input { display: none; }
.toggle-label {
  font-size: 0.8rem;
  padding: 2px 6px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--meta-color);
}
.toggle-btn input:checked + .toggle-label {
  background-color: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
}

/* Filters (Home) */
.filter-bar {
  display: flex;
  align-items: center;
  padding: 15px 0;
  border-bottom: 1px dashed var(--border-color);
  overflow-x: auto;
  white-space: nowrap;
  /* 隐藏滚动条 */
  scrollbar-width: none; 
  -ms-overflow-style: none;
}
.filter-bar::-webkit-scrollbar { display: none; }

.filter-label {
  font-weight: bold;
  margin-right: 15px;
  font-size: 0.9rem;
  flex-shrink: 0;
}
.filter-options {
  display: flex;
  gap: 10px;
}
.filter-btn {
  background: none;
  border: 1px solid transparent;
  padding: 4px 10px;
  border-radius: 15px;
  cursor: pointer;
  color: var(--text-color);
  font-size: 0.9rem;
  transition: all 0.2s;
  white-space: nowrap;
}
.filter-btn:hover {
  background-color: var(--hover-bg);
}
.filter-btn.active {
  background-color: var(--accent-color);
  color: white;
}

/* Post List */
.post-list { margin-top: 20px; }
.post-item {
  padding: 15px 0;
  border-bottom: 1px solid var(--border-color);
}
.post-link {
  display: flex;
  align-items: baseline;
  color: var(--text-color);
  text-decoration: none;
}
.post-link:hover .post-title { color: var(--link-color); }
.post-date {
  font-family: monospace;
  color: var(--meta-color);
  margin-right: 15px;
  min-width: 50px;
  flex-shrink: 0;
}
.post-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: normal;
}

/* ===== Post Detail & Banner ===== */

/* 通栏图片容器技巧：突破父级 max-width */
.post-banner-fullwidth {
  width: 100vw;
  position: relative;
  left: 50%;
  right: 50%;
  margin-left: -50vw;
  margin-right: -50vw;
  margin-bottom: 30px;
  background-color: var(--hover-bg); /* 图片加载前的占位色 */
}

.post-banner-img {
  width: 100%;
  height: 360px; /* 固定高度，可根据需要调整 */
  object-fit: cover; /* 保证图片填满且不变形 */
  display: block;
  margin: 0;
  border-radius: 0; /* 通栏图不需要圆角 */
}

.post-header { margin: 20px 0 30px; }
.post-title-main { margin-bottom: 10px; font-size: 2rem; line-height: 1.3; }
.post-meta { color: var(--meta-color); font-size: 0.9rem; display: flex; gap: 10px; }
.post-tags-meta { opacity: 0.7; }

.entry-content {
  font-size: 1.05rem;
  line-height: 1.8;
}
.entry-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 20px 0;
  border-radius: 4px;
}
.post-footer {
  margin-top: 50px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 600px) {
  .post-link { flex-direction: column; }
  .post-date { margin-bottom: 5px; font-size: 0.85rem; }
  
  /* 移动端减小通栏高度 */
  .post-banner-img { height: 200px; }
  .post-title-main { font-size: 1.5rem; }
}