/* ===== 艾复思学习手记 · 轻样式（清爽留白风）=====
   以新站 my-site 的轻量基调重写：
   米白底、墨字、青绿强调、浅边、无衬线、无纸纹
   保留全部原有 class 选择器，HTML / JS 零改动
================================================== */
:root {
  --bg: #fbfbf9;
  --bg-card: #ffffff;
  --ink: #2b2b2b;
  --ink-soft: #555555;
  --ink-faint: #999999;
  --accent: #3a7d6e;
  --accent-deep: #2f6b5e;
  --accent-soft: #eaf2ef;
  --seal: #3a7d6e;
  --seal-ink: #ffffff;
  --border: #e7e7e2;
  --border-strong: #d8d8d2;
  --tag-bg: #f1f1ec;
  --cat-bg: #eaf2ef;
  --shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
  --radius: 10px;
  --serif: "Noto Serif SC", "Songti SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: "JetBrains Mono", Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
/* 轻样式：纯净底，去掉纸面颗粒 */
.container { width: min(820px, 92%); margin: 0 auto; }
a { color: var(--accent-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== 印章（简化为轻量方块标记）===== */
.seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  background: var(--seal);
  color: var(--seal-ink);
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 1px;
  border-radius: 8px;
  user-select: none;
}

/* ===== 导航 ===== */
.site-header { background: rgba(255,255,255,0.85); backdrop-filter: saturate(180%) blur(8px); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 10; }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; }
.site-title { display: flex; align-items: center; gap: 10px; color: var(--ink); font-size: 1.2rem; font-weight: 700; letter-spacing: 1px; }
.site-title:hover { text-decoration: none; }
.site-sub { font-family: var(--sans); font-size: 0.72rem; font-weight: 400; color: var(--ink-faint); margin-left: 2px; letter-spacing: 2px; }
.site-nav a { color: var(--ink-soft); margin-left: 22px; font-size: 0.92rem; }
.site-nav a:hover { color: var(--accent-deep); text-decoration: none; }
.site-nav a.active { color: var(--accent-deep); font-weight: 600; }

main.container { flex: 1; padding: 40px 0 64px; }

/* ===== 首页 Hero ===== */
.hero {
  display: flex;
  gap: 30px;
  align-items: stretch;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 44px;
  margin-bottom: 40px;
}
.hero-main { flex: 1; min-width: 0; }
.hero-title { font-size: 1.9rem; color: var(--ink); letter-spacing: 1px; margin-bottom: 14px; font-weight: 700; }
.hero-desc { color: var(--ink-soft); font-size: 0.98rem; max-width: 580px; line-height: 1.8; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.hero-meta span { font-size: 0.78rem; color: var(--accent-deep); background: var(--accent-soft); border-radius: 999px; padding: 4px 14px; letter-spacing: 1px; }
.hero-side { display: flex; align-items: center; justify-content: flex-end; flex: 0 0 auto; padding-top: 4px; }
.hero-motto {
  writing-mode: vertical-rl;
  font-size: 0.92rem;
  letter-spacing: 4px;
  color: var(--accent-deep);
  line-height: 1.7;
  border-left: 1px solid var(--border-strong);
  padding-left: 14px;
  max-height: 100%;
}

.section-label {
  font-size: 1.15rem;
  letter-spacing: 2px;
  margin: 30px 0 18px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
  font-weight: 700;
}

/* ===== 知情行三栏 ===== */
.triptych { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 40px; }
.tri-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 22px;
  color: var(--ink);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.tri-card:hover { transform: translateY(-3px); box-shadow: 0 6px 16px rgba(0,0,0,0.08); border-color: var(--accent); text-decoration: none; }
.tri-glyph { display: block; font-size: 2rem; color: var(--accent); line-height: 1; margin-bottom: 12px; font-weight: 700; }
.tri-name { display: block; font-size: 1.1rem; font-weight: 700; letter-spacing: 2px; margin-bottom: 6px; }
.tri-desc { display: block; font-size: 0.82rem; color: var(--ink-faint); line-height: 1.7; }

/* ===== 筛选条 ===== */
.filter-bar {
  display: flex; align-items: center; gap: 10px;
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 16px;
  margin-bottom: 22px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.clear-filter { border: none; background: none; color: var(--accent-deep); cursor: pointer; font-size: 0.9rem; margin-left: auto; }
.clear-filter:hover { text-decoration: underline; }
.filter-bar .tag-chip.active { background: var(--accent); color: #fff; }

/* ===== 文章卡片 ===== */
.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 28px;
  margin-bottom: 18px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.post-card:hover { transform: translateY(-2px); box-shadow: 0 5px 16px rgba(0,0,0,0.08); border-color: var(--border-strong); }
.post-card-section { font-size: 0.74rem; color: var(--accent-deep); letter-spacing: 3px; margin-bottom: 6px; }
.post-card-title { font-size: 1.28rem; font-weight: 700; letter-spacing: 1px; margin-bottom: 8px; }
.post-card-title a { color: var(--ink); }
.post-card-title a:hover { color: var(--accent-deep); text-decoration: none; }
.post-card-meta { font-size: 0.8rem; color: var(--ink-faint); margin-bottom: 10px; }
.post-card-summary { color: var(--ink-soft); font-size: 0.92rem; margin-bottom: 14px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }

/* 光影卡片：顶部封面 + 内容区 */
.post-card.photos-card { padding: 0; overflow: hidden; }
.photos-card .post-card-inner { padding: 18px 26px 22px; }
.photo-cover { height: 180px; position: relative; background: linear-gradient(135deg, #d9e6e0 0%, #b8ccc4 45%, #8aa79a 100%); }
.photo-cover-label {
  position: absolute; right: 14px; bottom: 12px;
  font-size: 0.72rem; letter-spacing: 2px;
  color: #fff; background: rgba(46, 40, 30, 0.4);
  border-radius: 4px; padding: 2px 10px;
}
.photo-cover-img { width: 100%; height: 100%; object-fit: cover; display: block; }

.tag-chip, .cat-chip {
  display: inline-block;
  font-size: 0.76rem;
  padding: 2px 12px;
  border-radius: 999px;
  letter-spacing: 1px;
}
.tag-chip { background: var(--tag-bg); color: var(--ink-soft); }
.cat-chip { background: var(--cat-bg); color: var(--accent-deep); }
a.tag-chip:hover, a.cat-chip:hover { background: var(--accent-soft); color: var(--accent-deep); text-decoration: none; }

.empty-tip { text-align: center; color: var(--ink-faint); padding: 60px 0; letter-spacing: 2px; }

/* ===== 分类导航区 ===== */
.taxo-map { margin-top: 44px; }
.taxo-row { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 14px; }
.taxo-key { font-size: 0.85rem; color: var(--ink-faint); white-space: nowrap; line-height: 28px; width: 68px; }
.taxo-chips { display: flex; flex-wrap: wrap; gap: 8px; }

/* ===== 栏目页 ===== */
.section-header { margin-bottom: 26px; }
.page-title { font-size: 1.7rem; letter-spacing: 2px; }
.page-desc { color: var(--ink-faint); font-size: 0.9rem; margin-top: 8px; }

/* ===== 文章页 ===== */
.back-link { display: inline-block; font-size: 0.9rem; color: var(--ink-soft); margin-bottom: 22px; }
.back-link:hover { color: var(--accent-deep); }
.article { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 44px 50px; }
.article-header { margin-bottom: 28px; }
.article-title { font-size: 1.8rem; line-height: 1.5; letter-spacing: 1px; margin-bottom: 12px; font-weight: 700; }
.article-meta { color: var(--ink-faint); font-size: 0.85rem; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.article-meta .chips { margin-left: 6px; }

/* ===== Markdown 排版 ===== */
.markdown-body { color: #33312a; }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 { color: var(--ink); line-height: 1.5; letter-spacing: 1px; margin: 1.8em 0 0.7em; }
.markdown-body h2 { font-size: 1.3rem; border-bottom: 1px solid var(--border-strong); padding-bottom: 8px; }
.markdown-body h3 { font-size: 1.12rem; }
.markdown-body p { margin: 0.95em 0; }
.markdown-body blockquote { border-left: 4px solid var(--accent); background: var(--accent-soft); border-radius: 0 6px 6px 0; padding: 12px 20px; margin: 1.2em 0; color: var(--ink-soft); }
.markdown-body blockquote p { margin: 0.3em 0; }
.markdown-body ul, .markdown-body ol { padding-left: 1.6em; margin: 0.95em 0; }
.markdown-body code { font-family: var(--mono); font-size: 0.88em; background: var(--tag-bg); border-radius: 4px; padding: 2px 6px; }
.markdown-body pre { background: #2c2f26; color: #e5e3d4; border-radius: 6px; padding: 18px 20px; overflow-x: auto; margin: 1.2em 0; line-height: 1.6; }
.markdown-body pre code { background: none; color: inherit; padding: 0; }
.markdown-body img { max-width: 100%; border-radius: 6px; margin: 1em 0; box-shadow: 0 2px 10px rgba(0,0,0,0.08); }
.markdown-body video { display: block; width: 100%; border-radius: 6px; margin: 1.2em 0; background: #191c15; }
.img-pending { border: 2px dashed var(--border-strong); border-radius: 6px; padding: 28px 18px; text-align: center; color: var(--ink-faint); font-size: 0.85rem; margin: 1em 0; background: var(--tag-bg); }
.markdown-body hr { border: none; border-top: 1px dashed var(--border-strong); margin: 2.2em 0; }
.markdown-body table { border-collapse: collapse; width: 100%; margin: 1.2em 0; font-size: 0.92rem; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border-strong); padding: 8px 12px; text-align: left; }
.markdown-body th { background: var(--tag-bg); letter-spacing: 1px; }
.markdown-body p.ai-decl { font-size: 0.78rem; color: var(--ink-faint); line-height: 1.8; margin-top: 1.5em; letter-spacing: 0.2px; }
.markdown-body p.ai-decl strong { font-weight: 500; color: var(--ink-soft); }

.ai-note {
  margin-top: 2.6em;
  padding: 12px 18px;
  background: var(--tag-bg);
  border-left: 3px solid var(--ink-faint);
  border-radius: 0 6px 6px 0;
  font-size: 0.8rem;
  color: var(--ink-faint);
}

/* ===== 上下篇 ===== */
.article-nav { display: flex; justify-content: space-between; gap: 16px; margin-top: 24px; }
.article-nav a { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; font-size: 0.9rem; color: var(--ink-soft); max-width: 48%; box-shadow: var(--shadow); }
.article-nav a:hover { border-color: var(--accent); text-decoration: none; color: var(--accent-deep); }
.article-nav .nav-label { display: block; font-size: 0.74rem; color: var(--ink-faint); margin-bottom: 4px; letter-spacing: 2px; }
.article-nav .nav-next { margin-left: auto; text-align: right; }

/* ===== 页脚 ===== */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-card); padding: 26px 0; text-align: center; color: var(--ink-soft); font-size: 0.9rem; letter-spacing: 1px; }
.footer-creed { color: var(--accent-deep); font-size: 0.84rem; letter-spacing: 4px; margin-bottom: 8px; }
.footer-creed .dot { color: var(--accent); margin: 0 2px; }
.footer-meta { color: var(--ink-faint); font-size: 0.74rem; margin-top: 4px; letter-spacing: 0; }
.footer-meta a { color: var(--ink-faint); text-decoration: none; border-bottom: 1px dotted var(--border); }
.footer-meta a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .header-inner { flex-direction: column; gap: 10px; }
  .site-nav a { margin: 0 9px; }
  .article { padding: 28px 22px; }
  .article-title { font-size: 1.45rem; }
  .hero { flex-direction: column; padding: 26px 24px; gap: 20px; }
  .hero-side { justify-content: flex-start; }
  .hero-motto { height: 150px; letter-spacing: 6px; border-left: none; border-top: 1px solid var(--border-strong); padding: 14px 0 0; }
  .triptych { grid-template-columns: 1fr; }
  .article-nav { flex-direction: column; }
  .article-nav a { max-width: 100%; }
  .article-nav .nav-next { text-align: left; }
  .taxo-row { flex-direction: column; gap: 6px; }
}