/* =====================================================================
   风雨墨 · 笔记 — 全局样式
   ---------------------------------------------------------------------
   设计语言：墨黑 + 纸张白 + 印章红，整体像一本宣纸册子
   ===================================================================== */

/* ---------- 调色板与字体变量 ---------- */
:root {
  /* 颜色 */
  --ink:           #1a1a1a;   /* 浓墨 — 主文字 */
  --ink-soft:      #5e5e5e;   /* 淡墨 — 次文字 */
  --ink-faint:     #a8a3a8;   /* 薄墨 — 辅助文字、标签 */
  --ink-light:     #d7d2c5;   /* 极淡 — 分隔线 */
  --paper:         #f8f5ef;   /* 宣纸白 — 主背景 */
  --paper-warm:    #f3eee3;   /* 纸张阴影 */
  --seal:          #a83c2f;   /* 印章红 — 点缀 */
  --seal-soft:     #c25548;   /* 印章红浅版 */

  /* 字体 */
  --font-serif:    "Noto Serif SC", "Source Han Serif SC",
                   "Songti SC", "SimSun", "STSong", "FangSong", serif;
  --font-sans:     -apple-system, BlinkMacSystemFont, "Segoe UI",
                   "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono:     "SF Mono", Menlo, Consolas, monospace;

  /* 排版 */
  --max-width:     720px;
  --reading-width: 680px;
  --gutter:        1.5rem;
}

/* ---------- 暗色模式：墨色反转 ---------- */
@media (prefers-color-scheme: dark) {
  :root {
    --ink:        #e8e4d9;
    --ink-soft:   #b8b3a4;
    --ink-faint:  #6e6a5e;
    --ink-light:  #3a3a36;
    --paper:      #15140f;
    --paper-warm: #1c1b15;
    --seal:       #d97a6c;
    --seal-soft:  #c46454;
  }
}

/* ---------- 基础重置 ---------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-serif);
  color: var(--ink);
  background: var(--paper);
  background-image:
    radial-gradient(at 15% 15%, rgba(168, 60, 47, 0.025) 0%, transparent 45%),
    radial-gradient(at 85% 85%, rgba(26, 26, 26, 0.02) 0%, transparent 45%);
  min-height: 100vh;
  padding: 3rem 1.5rem 4rem;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.site-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* =====================================================================
   1. 首页头部：站名 + 简介
   ===================================================================== */

.site-header {
  text-align: center;
  padding: 3rem 0 4rem;
  border-bottom: 1px solid var(--ink-light);
  margin-bottom: 4rem;
}

.site-name {
  font-size: 3.5rem;
  font-weight: 500;
  letter-spacing: 0.4em;
  margin-bottom: 2rem;
  padding-left: 0.4em;       /* 视觉居中补偿 */
  color: var(--ink);
  font-family: var(--font-serif);
}

.site-bio {
  font-size: 0.95rem;
  line-height: 2.2;
  color: var(--ink-soft);
  max-width: 480px;
  margin: 0 auto;
  letter-spacing: 0.05em;
}

/* =====================================================================
   2. 板块小标题（笔记 / 近期落墨）
   ===================================================================== */

.section-title {
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.6em;
  padding-left: 0.6em;
  text-align: center;
  margin-bottom: 0.75rem;
  color: var(--ink-soft);
  font-family: var(--font-serif);
}

.section-sub {
  text-align: center;
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin-bottom: 2.5rem;
  font-family: var(--font-serif);
  font-style: italic;
  letter-spacing: 0.05em;
}

/* =====================================================================
   3. 主板块：5 个子栏目卡片
   ===================================================================== */

.categories {
  margin-bottom: 5rem;
}

.category-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.cat-card {
  display: block;
  padding: 1.75rem 1.5rem 1.5rem;
  border: 1px solid var(--ink-light);
  border-radius: 2px;
  text-decoration: none;
  color: var(--ink);
  background: var(--paper);
  transition: transform 0.35s ease,
              box-shadow 0.35s ease,
              border-color 0.35s ease;
  position: relative;
}

/* hover 时浮起，呼应"风起" */
.cat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(26, 26, 26, 0.08);
  border-color: var(--ink-soft);
}

/* 印章样式的圆形图标 */
.cat-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border: 2px solid var(--seal);
  color: var(--seal);
  font-size: 1.7rem;
  font-weight: 600;
  border-radius: 50%;
  margin-bottom: 1rem;
  letter-spacing: 0;
  font-family: var(--font-serif);
}

.cat-card h3.cat-title {
  font-size: 1.4rem;
  font-weight: 500;
  margin-bottom: 0.2rem;
  letter-spacing: 0.25em;
  padding-left: 0.25em;
}

.cat-section {
  font-size: 0.78rem;
  color: var(--ink-faint);
  letter-spacing: 0.15em;
  margin-bottom: 0.85rem;
  font-family: var(--font-sans);
  padding-left: 0.15em;
}

.cat-desc {
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.75;
  letter-spacing: 0.02em;
}

/* =====================================================================
   4. 近期落墨文章列表
   ===================================================================== */

.recent-posts {
  margin-bottom: 5rem;
}

.post-list {
  list-style: none;
  border-top: 1px solid var(--ink-light);
}

.post-list li {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--ink-light);
  font-size: 0.95rem;
  transition: background-color 0.2s ease;
}

.post-list li:hover {
  background: var(--paper-warm);
}

.post-list time {
  flex-shrink: 0;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  min-width: 6.5rem;
}

.post-cat {
  flex-shrink: 0;
  display: inline-block;
  font-size: 0.72rem;
  color: var(--seal);
  border: 1px solid var(--seal);
  padding: 0.1rem 0.55rem;
  border-radius: 1px;
  font-family: var(--font-sans);
  letter-spacing: 0.1em;
  min-width: 3.5rem;
  text-align: center;
}

.post-list a {
  color: var(--ink);
  text-decoration: none;
  flex: 1;
  transition: color 0.2s ease;
  letter-spacing: 0.02em;
}

.post-list a:hover {
  color: var(--seal);
}

/* =====================================================================
   5. 关于页
   ===================================================================== */

.page-header {
  padding: 1rem 0 3rem;
  border-bottom: 1px solid var(--ink-light);
  margin-bottom: 3rem;
}

.breadcrumb {
  font-size: 0.82rem;
  color: var(--ink-faint);
  margin-bottom: 1.5rem;
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
}

.breadcrumb a {
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumb a:hover {
  color: var(--seal);
}

.breadcrumb .sep {
  margin: 0 0.5rem;
  color: var(--ink-light);
}

.page-title {
  font-size: 2.2rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  padding-left: 0.25em;
  color: var(--ink);
}

.post-content {
  max-width: var(--reading-width);
  font-size: 1.05rem;
  line-height: 1.95;
  color: var(--ink);
}

.content-section {
  margin-bottom: 3.5rem;
}

.content-section:last-child {
  margin-bottom: 0;
}

.post-content p {
  margin-bottom: 1.25rem;
  color: var(--ink-soft);
}

.lede {
  font-size: 1.1rem;
  color: var(--ink) !important;
  font-weight: 500;
}

.ink-quote {
  margin: 2rem 0;
  padding: 1.5rem 1.5rem 1.5rem 2rem;
  border-left: 3px solid var(--seal);
  background: rgba(168, 60, 47, 0.04);
  color: var(--ink);
  font-size: 1.1rem;
  line-height: 2;
}

.post-content h2 {
  font-size: 1.3rem;
  font-weight: 500;
  margin: 0 0 1.25rem;
  padding-left: 0.9rem;
  border-left: 3px solid var(--seal);
  letter-spacing: 0.15em;
  color: var(--ink);
}

/* 栏目列表（关于页内） */
.cat-list {
  list-style: none;
  border-top: 1px solid var(--ink-light);
}

.cat-list li {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--ink-light);
  font-size: 0.95rem;
}

.cat-list .cat-name {
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.1em;
  color: var(--seal);
  min-width: 3.5rem;
}

.cat-list .cat-meta {
  font-size: 0.8rem;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
  font-family: var(--font-sans);
  min-width: 8rem;
}

.cat-list .cat-desc {
  color: var(--ink-soft);
}

/* =====================================================================
   6. 文末签名 + 站点底部
   ===================================================================== */

.site-footer {
  text-align: center;
  padding: 3rem 0 1rem;
  border-top: 1px solid var(--ink-light);
  margin-top: 4rem;
}

.signature {
  font-size: 1.05rem;
  line-height: 2;
  color: var(--ink-soft);
  letter-spacing: 0.18em;
  margin-bottom: 2rem;
  font-style: italic;
}

.footer-links {
  font-size: 0.85rem;
  margin-bottom: 1rem;
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
}

.footer-links a {
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.2s ease;
  margin: 0 0.25rem;
}

.footer-links a:hover {
  color: var(--seal);
}

.footer-links .dot {
  color: var(--ink-faint);
  margin: 0 0.4rem;
}

.copyright {
  font-size: 0.75rem;
  color: var(--ink-faint);
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
  margin-top: 0.5rem;
}

/* =====================================================================
   7. 通用元素
   ===================================================================== */

a {
  color: var(--ink);
}

::selection {
  background: var(--seal);
  color: var(--paper);
}

/* =====================================================================
   8. 响应式
   ===================================================================== */

@media (max-width: 640px) {
  html {
    font-size: 16px;
  }

  body {
    padding: 1.5rem 1rem 3rem;
  }

  .site-header {
    padding: 1.5rem 0 2.5rem;
    margin-bottom: 3rem;
  }

  .site-name {
    font-size: 2.4rem;
    letter-spacing: 0.3em;
    padding-left: 0.3em;
  }

  .site-bio {
    font-size: 0.88rem;
    line-height: 2;
  }

  .categories {
    margin-bottom: 4rem;
  }

  .category-nav {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .recent-posts {
    margin-bottom: 4rem;
  }

  .post-list li {
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.75rem 0;
  }

  .post-list time {
    min-width: auto;
  }

  .page-title {
    font-size: 1.7rem;
  }

  .cat-list li {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }

  .signature {
    letter-spacing: 0.12em;
  }
}

/* =====================================================================
   9. 栏目索引页（posts/{cat}/index.html）
   ===================================================================== */

.page-header--center {
  text-align: center;
}

.cat-icon-large {
  width: 72px;
  height: 72px;
  font-size: 2.2rem;
  margin: 0 auto 1.5rem;
}

.page-tagline {
  font-size: 0.88rem;
  color: var(--ink-faint);
  letter-spacing: 0.2em;
  margin-top: 0.75rem;
  font-family: var(--font-sans);
  padding-left: 0.2em;
}

.cat-intro {
  margin: 2.5rem 0 3rem;
  padding: 1.5rem 1.5rem 1.5rem 2rem;
  border-left: 3px solid var(--ink-light);
  background: var(--paper-warm);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.cat-intro p {
  margin-bottom: 0.5rem;
}

.cat-intro p:last-child {
  margin-bottom: 0;
}

/* 移动端栏目页调整 */
@media (max-width: 640px) {
  .cat-icon-large {
    width: 56px;
    height: 56px;
    font-size: 1.7rem;
  }

  .page-tagline {
    font-size: 0.8rem;
  }

  .cat-intro {
    margin: 2rem 0 2.5rem;
    padding: 1.25rem;
  }
}

/* =====================================================================
   10. 文章页（posts/{cat}/yyyy-mm-dd-slug.html）
   ===================================================================== */

.article-header {
  text-align: center;
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--ink-light);
}

.article-header .cat-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--seal-red);
  margin-bottom: 1rem;
}

.article-header h1 {
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--ink);
  margin-bottom: 1rem;
}

.article-meta {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
}

.article-meta .sep {
  margin: 0 0.6rem;
  color: var(--ink-light);
}

.article-body {
  font-size: 1.06rem;
  line-height: 1.95;
  color: var(--ink-soft);
}

.article-body p {
  margin-bottom: 1.4rem;
  text-indent: 2em;
}

.article-body p:first-child {
  text-indent: 0;
}

.article-body h2 {
  font-size: 1.3rem;
  font-weight: 500;
  margin: 2.5rem 0 1.2rem;
  padding-left: 0.8rem;
  border-left: 3px solid var(--seal-red);
  color: var(--ink);
}

.article-body h3 {
  font-size: 1.1rem;
  font-weight: 500;
  margin: 2rem 0 1rem;
  color: var(--ink);
}

.article-body blockquote {
  margin: 2rem 0;
  padding: 1rem 1.5rem;
  border-left: 3px solid var(--ink-light);
  background: var(--paper-warm);
  font-size: 0.95rem;
  color: var(--ink-faint);
  font-style: italic;
}

.article-body blockquote p {
  text-indent: 0;
  margin-bottom: 0.5rem;
}

.article-body blockquote p:last-child {
  margin-bottom: 0;
}

.article-body ul,
.article-body ol {
  margin: 1.5rem 0 1.5rem 2em;
}

.article-body li {
  margin-bottom: 0.5rem;
  line-height: 1.85;
}

.article-body code {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.9em;
  background: var(--paper-warm);
  padding: 0.1em 0.4em;
  border-radius: 3px;
  color: var(--seal-red);
}

.article-body hr {
  border: none;
  border-top: 1px dashed var(--ink-light);
  margin: 3rem 0;
}

.article-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px dashed var(--ink-light);
}

.article-signature {
  text-align: center;
  margin: 2rem 0 3rem;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
  line-height: 1.9;
}

.article-nav {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  margin-top: 2rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
}

.article-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border: 1px solid var(--ink-light);
  border-radius: 4px;
  transition: all 0.2s;
}

.article-nav a:hover {
  border-color: var(--seal-red);
  color: var(--seal-red);
}

.article-nav .nav-placeholder {
  visibility: hidden;
}

@media (max-width: 640px) {
  .article-header h1 {
    font-size: 1.5rem;
  }

  .article-body {
    font-size: 1rem;
  }

  .article-nav {
    flex-direction: column;
  }

  .article-nav a {
    text-align: center;
  }
}

/* =====================================================================
   11. 文章列表中的"待写"标记
   ===================================================================== */

.post-list .post-status {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--ink-faint);
  font-style: italic;
  margin-left: 0.3rem;
}