:root {
  --reading-font: "Iowan Old Style", "Palatino Linotype", "Source Han Serif SC", "Noto Serif SC", "Songti SC", serif;
  --ui-font: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --reading-max-width: 78ch;
  /* 与论文精读 / 408 讲义共用的暖纸色板 */
  --paper: #f5f2eb;
  --paper-card: #fcfaf5;
  --paper-line: #d8d1c4;
  --paper-soft: #efeae1;
  --ink: #34312d;
  --ink-soft: #676157;
  --accent: #675747;
  --accent-warm: #81582c;
}

body {
  font-family: var(--ui-font);
}

.post-content,
post-custom {
  padding-left: 12%;
  padding-right: 12%;
}

.post-content .markdown-body {
  font-family: var(--reading-font);
  font-size: 1.06rem;
  line-height: 1.95;
  letter-spacing: 0.008em;
  text-rendering: optimizeLegibility;
  max-width: var(--reading-max-width);
  margin-left: auto;
  margin-right: auto;
}

.post-content .markdown-body p {
  margin: 1.15em 0;
  text-align: justify;
  text-justify: inter-ideograph;
}

.post-content .markdown-body > h2,
.post-content .markdown-body > h3,
.post-content .markdown-body > h4 {
  line-height: 1.5;
}

.post-content .markdown-body > h2 {
  margin-top: 2.6em;
  margin-bottom: 1em;
  padding-bottom: 0.35em;
  border-bottom: 1px solid var(--line-color);
}

.post-content .markdown-body > h3 {
  margin-top: 2em;
  margin-bottom: 0.8em;
}

.post-content .markdown-body ul,
.post-content .markdown-body ol {
  margin-top: 0.9em;
  margin-bottom: 1.2em;
  padding-left: 1.4em;
}

.post-content .markdown-body li {
  margin: 0.48em 0;
}

.post-content .markdown-body blockquote {
  margin: 1.4em 0;
  padding: 0.9em 1.1em;
  border-left: 4px solid var(--post-link-color);
  border-radius: 8px;
  background-color: var(--board-bg-color);
}

.post-content .markdown-body table {
  margin: 1.4em 0;
  width: 100%;
  font-size: 0.95em;
  border-radius: 10px;
  overflow: hidden;
}

.post-content .markdown-body th {
  font-weight: 700;
  background-color: var(--board-bg-color);
}

.post-content .markdown-body code {
  border-radius: 4px;
  padding: 0.12em 0.28em;
}

.post-content .markdown-body hr {
  margin: 2.3em 0;
}

@media (max-width: 991px) {
  .post-content,
  post-custom {
    padding-left: 6%;
    padding-right: 6%;
  }

  .post-content .markdown-body {
    font-size: 1.02rem;
    line-height: 1.88;
  }
}

@media (max-width: 767px) {
  .post-content,
  post-custom {
    padding-left: 1.2rem;
    padding-right: 1.2rem;
  }

  .post-content .markdown-body {
    max-width: 100%;
    font-size: 1rem;
    line-height: 1.82;
  }

  .post-content .markdown-body > h2 {
    margin-top: 2.2em;
  }
}

/* ========================================================== */
/*  🌾 Warm paper: 与论文精读 / 408 讲义共用一套视觉语言        */
/* ========================================================== */

body { background-color: var(--paper); color: var(--ink); }

/* 导航：纸面底色 + 一条细线，不再用深蓝底 */
.navbar {
  backdrop-filter: blur(12px) saturate(120%);
  -webkit-backdrop-filter: blur(12px) saturate(120%);
  border-bottom: 1px solid var(--paper-line);
  box-shadow: none !important;
  transition: background-color .24s ease, box-shadow .24s ease !important;
}
/* Fluid 首页的 navbar 默认透明，叠在深色头图上；这里改成实心纸面 */
#navbar.navbar,
#navbar.navbar.scrolling-navbar {
  background-color: var(--paper-soft) !important;
}
#navbar.navbar .nav-link,
#navbar.navbar .navbar-brand {
  color: var(--ink) !important;
}
#navbar.navbar .nav-link:hover {
  color: var(--accent-warm) !important;
}

/* 门厅：一句定位 + 两个入口，不是营销大图 */
.welcome { max-width: 860px; padding: 8px 4px 24px; }
.welcome-kicker {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .16em;
}
.welcome h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--reading-font);
  font-size: clamp(2rem, 4vw, 2.7rem);
  font-weight: 600;
  letter-spacing: -.01em;
}
.welcome-lede {
  max-width: 34em;
  margin: 10px 0 26px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.8;
}
.welcome-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.welcome-card {
  display: block;
  border: 1px solid var(--paper-line);
  border-radius: 14px;
  background: var(--paper-card);
  padding: 22px 22px 20px;
  color: var(--ink);
  text-decoration: none;
  transition: border-color .18s ease, transform .18s ease;
}
.welcome-card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.welcome-card__meta { display: block; color: var(--ink-soft); font-size: 12px; letter-spacing: .02em; }
.welcome-card h3 {
  margin: 8px 0 6px;
  font-family: var(--reading-font);
  font-size: 24px;
  font-weight: 600;
}
.welcome-card p { margin: 0 0 16px; color: var(--ink-soft); font-size: 13.5px; line-height: 1.75; }
.welcome-card__go { color: var(--accent); font-size: 13px; font-weight: 650; }
.welcome-card:hover .welcome-card__go { color: var(--accent-warm); }

/* 文章卡片：同一套纸面语法，去掉玻璃发光与流光 */
.index-card {
  border: 1px solid var(--paper-line) !important;
  border-radius: 14px !important;
  background: var(--paper-card);
  box-shadow: none !important;
  transition: border-color .18s ease !important;
}
.index-card:hover { border-color: var(--accent) !important; box-shadow: none !important; }
.index-card::after { display: none !important; }

/* 标签与徽章 */
.post-meta a, .tagcloud a, .badge { border-radius: 999px !important; transition: color .2s ease !important; }
.index-info .post-metas a:hover { color: var(--accent-warm) !important; text-decoration: none; }

/* 代码块与滚动条 */
.markdown-body pre { border-radius: 12px !important; border: 1px solid var(--paper-line) !important; box-shadow: none !important; }
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(103, 87, 71, .28); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: rgba(103, 87, 71, .45); }

html { scroll-behavior: smooth; }

/* 暗色模式沿用深色纸面 */
[data-user-color-scheme="dark"] body { background-color: #181c27; }
[data-user-color-scheme="dark"] .welcome-card,
[data-user-color-scheme="dark"] .index-card { background: #252d38; border-color: #435266 !important; }
[data-user-color-scheme="dark"] .welcome h2 { color: #ddd8cf; }
[data-user-color-scheme="dark"] .welcome-card h3 { color: #ddd8cf; }

@media (prefers-reduced-motion: reduce) {
  .welcome-card, .index-card { transition: none; }
  html { scroll-behavior: auto; }
}