/* 卡片式博客样式 —— 参考截图布局 */

:root {
  /* Claude / Anthropic 暖色系 */
  --bg: #faf9f5;
  --surface: #ffffff;
  --text: #141413;
  --text-secondary: #3d3d3a;
  --text-muted: #87867f;
  --border: #e8e6dc;
  --tag-bg: #e3dacc;
  --tag-text: #5e5d59;
  --tag-active-bg: #d4c4a8;
  --accent: #d97757;
  --accent-deep: #c6613f;
  --shadow: 0 1px 3px rgba(20, 20, 19, 0.05), 0 4px 14px rgba(20, 20, 19, 0.04);
  --radius: 14px;
  --radius-sm: 999px;
  --container: 1080px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font);
  line-height: 1.7;
  font-weight: 400;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  opacity: 0.75;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* —— 顶部导航 —— */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 58px;
  gap: 1rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  flex-wrap: wrap;
}

.site-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
}

.site-title:hover {
  opacity: 1;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.site-nav a.active {
  color: var(--text);
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  color: var(--text-secondary);
}

.icon-btn:hover {
  background: var(--bg);
  opacity: 1;
  color: var(--text);
}

/* —— 主区域 —— */
.site-main {
  padding: 2rem 0 3rem;
}

/* —— 首页双栏 —— */
.blog-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 1.5rem;
  align-items: start;
}

.blog-heading {
  margin: 0 0 1.25rem;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.post-card,
.content-card,
.sidebar-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.post-card {
  padding: 1.5rem 1.6rem 1.35rem;
  transition: box-shadow 0.2s ease;
}

.post-card:hover {
  box-shadow: 0 2px 8px rgba(20, 20, 19, 0.07), 0 8px 20px rgba(20, 20, 19, 0.05);
}

.post-card-title {
  margin: 0 0 0.7rem;
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.4;
}

.post-card-title a:hover {
  opacity: 0.7;
}

.post-card-excerpt {
  margin: 0 0 1.1rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.post-card-date,
.post-meta time {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.icon-calendar {
  flex-shrink: 0;
}

.post-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.15rem;
  padding: 0.22rem 0.7rem;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--tag-bg);
  color: var(--tag-text);
  font-family: inherit;
  font-size: 0.8rem;
  line-height: 1.5;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease;
}

a.tag-pill:hover,
button.tag-pill:hover {
  background: var(--tag-active-bg);
  opacity: 1;
}

.tag-pill.is-active {
  background: var(--accent);
  font-weight: 600;
  color: #faf9f5;
}

.tag-count {
  opacity: 0.75;
}

.filter-empty {
  margin: 1.5rem 0 0;
  color: var(--text-muted);
  text-align: center;
}

/* —— 侧栏 —— */
.blog-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: sticky;
  top: 74px;
}

.sidebar-card {
  padding: 1.15rem 1.2rem 1.25rem;
}

.sidebar-title {
  margin: 0 0 0.85rem;
  font-size: 1rem;
  font-weight: 700;
}

.sort-select {
  width: 100%;
  padding: 0.55rem 2rem 0.55rem 0.85rem;
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238a8a8a' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E") no-repeat right 0.75rem center;
  border: 1px solid var(--border);
  border-radius: 10px;
  appearance: none;
  outline: none;
  cursor: pointer;
}

.sort-select:focus {
  border-color: var(--accent);
}

.sidebar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

/* —— 文章 / 页面卡片 —— */
.content-card {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 2.2rem 2.5rem;
}

.post-header,
.page-header {
  margin-bottom: 1.75rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.post-title,
.page-title {
  margin: 0 0 0.85rem;
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.35;
}

.post-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.post-content,
.page-content {
  color: var(--text);
  font-size: 1rem;
  line-height: 1.85;
}

.post-content h2,
.page-content h2 {
  margin: 2rem 0 0.9rem;
  font-size: 1.35rem;
  font-weight: 700;
}

.post-content h3,
.page-content h3 {
  margin: 1.6rem 0 0.7rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.post-content p,
.page-content p {
  margin: 0 0 1.15rem;
}

.post-content ul,
.post-content ol,
.page-content ul,
.page-content ol {
  margin: 0 0 1.15rem;
  padding-left: 1.4rem;
}

.post-content li,
.page-content li {
  margin-bottom: 0.35rem;
}

.post-content blockquote,
.page-content blockquote {
  margin: 0 0 1.15rem;
  padding: 0.15rem 0 0.15rem 1rem;
  border-left: 3px solid var(--accent);
  color: var(--text-secondary);
}

.post-content code,
.page-content code {
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.88em;
  background: var(--bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.post-content pre,
.page-content pre {
  margin: 0 0 1.15rem;
  padding: 1rem 1.15rem;
  background: var(--bg);
  border-radius: 10px;
  overflow-x: auto;
  line-height: 1.55;
  font-size: 0.88rem;
}

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

.post-content img,
.page-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.4rem auto;
  border-radius: 10px;
}

.post-content hr,
.page-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

.post-content a,
.page-content a {
  color: var(--accent-deep);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.post-content a:hover,
.page-content a:hover {
  color: var(--accent);
  opacity: 1;
}

/* —— 标签页 —— */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.tag-cloud a {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.85rem;
}

.tag-cloud a:hover {
  background: var(--tag-active-bg);
  opacity: 1;
}

.tag-group {
  margin-bottom: 2rem;
}

.tag-group h2 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
  font-weight: 700;
  scroll-margin-top: 5rem;
}

.tag-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tag-group li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

.tag-group li a {
  font-weight: 500;
}

.tag-group li time {
  color: var(--text-muted);
  font-size: 0.85rem;
  white-space: nowrap;
}

/* —— 搜索页 —— */
.search-form {
  margin-bottom: 1.5rem;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  background: var(--bg);
  outline: none;
}

.search-input:focus {
  border-color: var(--accent);
  background: var(--surface);
}

.search-results {
  list-style: none;
  margin: 0;
  padding: 0;
}

.search-results li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

.search-results h3 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
  font-weight: 600;
}

.search-results p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.search-empty {
  color: var(--text-muted);
  border-bottom: none !important;
}

/* —— 页脚 —— */
.site-footer {
  padding: 1.5rem 0 2.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

.site-footer a {
  color: var(--text-muted);
}

.site-footer a:hover {
  color: var(--text);
  opacity: 1;
}

/* —— 响应式 —— */
@media (max-width: 900px) {
  .blog-layout {
    grid-template-columns: 1fr;
  }

  .blog-sidebar {
    position: static;
    order: -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }
}

@media (max-width: 640px) {
  .header-left {
    gap: 1rem;
  }

  .site-nav {
    gap: 0.9rem;
    font-size: 0.9rem;
  }

  .blog-sidebar {
    grid-template-columns: 1fr;
  }

  .content-card {
    padding: 1.4rem 1.2rem 1.8rem;
  }

  .post-title,
  .page-title {
    font-size: 1.45rem;
  }

  .blog-heading {
    font-size: 1.45rem;
  }

  .post-card {
    padding: 1.25rem;
  }

  .post-card-title {
    font-size: 1.2rem;
  }
}