/* ============================================================
   日落孤城 · 站点样式（冷灰蓝科技风）
   灵感：范仲淹《渔家傲·秋思》—— 千嶂里，长烟落日孤城闭
   ============================================================ */

:root {
  --paper: #f8fafc;
  --card: #ffffff;
  --ink: #1e293b;
  --ink-soft: #64748b;
  --ink-faint: #94a3b8;
  --accent: #4f46e5;
  --accent-deep: #4338ca;
  --line: #e2e8f0;
  --line-soft: #eef2f7;

  /* 落日图景（冷调：靛蓝暮色下的城） */
  --sky-top: #f1f5f9;
  --sky-bottom: #c7d2fe;
  --sun: #6366f1;
  --ridge-far: #cbd5e1;
  --ridge-near: #94a3b8;
  --wall: #334155;
  --wall-dark: #1e293b;
  --bird: #334155;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f172a;
    --card: #1e293b;
    --ink: #e2e8f0;
    --ink-soft: #94a3b8;
    --ink-faint: #64748b;
    --accent: #818cf8;
    --accent-deep: #6366f1;
    --line: #334155;
    --line-soft: #293548;

    --sky-top: #0f172a;
    --sky-bottom: #1a2242;
    --sun: #818cf8;
    --ridge-far: #1e293b;
    --ridge-near: #172032;
    --wall: #0b1220;
    --wall-dark: #070d18;
    --bird: #0b1220;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN",
    "Songti SC", "SimSun", "NSimSun", serif;
  font-size: 17px;
  line-height: 1.9;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--sun); color: #eef2ff; }

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  transition: color .18s ease, border-color .18s ease;
}
a:hover { color: var(--accent-deep); border-bottom-color: var(--accent-deep); }

.wrap {
  width: min(var(--wrap-width, 90%), 100%);
  max-width: none;
  margin: 0 auto;
  padding: 0 12px;
}

/* ---------- 顶部导航 ---------- */
.site-nav {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 26px 0 0;
  font-size: 15px;
}
.site-nav .brand {
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--ink);
  border-bottom: none;
}
.site-nav .links a { margin-left: 20px; border-bottom: none; }
.site-nav .links a:hover { color: var(--accent-deep); }

/* ---------- 首页题图 ---------- */
.hero { margin-top: 26px; }
.hero svg { display: block; width: 100%; height: auto; }
.hero .title { text-align: center; margin: 26px 0 6px; }
.hero .title h1 {
  font-size: 40px;
  letter-spacing: .3em;
  text-indent: .3em; /* 抵消末字间距，视觉居中 */
  margin: 0;
  font-weight: 700;
}
.hero .subtitle {
  text-align: center;
  color: var(--ink-soft);
  font-size: 15px;
  letter-spacing: .08em;
  margin: 0 0 10px;
}
.hero .subtitle .divider {
  display: inline-block;
  margin: 0 14px;
  color: var(--ink-faint);
}

.home-intro {
  text-align: center;
  color: var(--ink-soft);
  margin: 30px 0 -6px;
}

/* ---------- 通用板块标题 ---------- */
.section-title {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 54px 0 8px;
  font-size: 15px;
  letter-spacing: .35em;
  color: var(--ink-soft);
  font-weight: 400;
}
.section-title::before,
.section-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

/* ---------- 文章列表 ---------- */
.article-list { margin: 26px 0 10px; }
.article-item {
  display: block;
  padding: 26px 4px 24px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--ink);
}
.article-item:first-child { border-top: 1px solid var(--line-soft); }
.article-item:hover { background: var(--card); }
.article-item .date {
  font-size: 13px;
  color: var(--ink-faint);
  letter-spacing: .12em;
  font-family: "JetBrains Mono", "Courier New", monospace;
}
.article-item h2 {
  margin: 6px 0 8px;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: .02em;
}
.article-item:hover h2 { color: var(--accent); }
.article-item p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15.5px;
  line-height: 1.85;
}
.article-item .meta {
  margin-top: 10px;
  font-size: 13px;
  color: var(--ink-faint);
}

.year-heading {
  font-size: 18px;
  color: var(--ink-soft);
  letter-spacing: .2em;
  margin: 46px 0 -8px;
  font-weight: 400;
}

/* ---------- 标签 ---------- */
.tag-cloud { margin: 20px 0 6px; line-height: 2.4; }
.tag-cloud .tag {
  display: inline-block;
  font-size: 13px;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 1px 12px;
  margin-right: 8px;
  border-bottom: 1px solid var(--line);
}
.tag-cloud .tag:hover { color: var(--accent-deep); border-color: var(--accent); }
.tag-cloud .tag.active { color: #fff8ee; background: var(--accent); border-color: var(--accent); }
.tag-cloud .tag.clear { border-style: dashed; }

/* ---------- 文章页 ---------- */
.article-header { margin: 56px 0 8px; }
.article-header .date {
  font-size: 13.5px;
  color: var(--ink-faint);
  letter-spacing: .12em;
  font-family: "JetBrains Mono", "Courier New", monospace;
}
.article-header h1 {
  font-size: 30px;
  line-height: 1.5;
  margin: 10px 0 6px;
  font-weight: 700;
}
.article-header .meta {
  color: var(--ink-faint);
  font-size: 14px;
  margin-bottom: 8px;
}

.article-body { font-size: 17px; margin: 30px 0 10px; }
.article-body p { margin: 0 0 1.4em; }
.article-body blockquote {
  margin: 1.6em 0;
  padding: 2px 0 2px 20px;
  border-left: 3px solid var(--sun);
  color: var(--ink-soft);
}
.article-body h2 {
  font-size: 20px;
  margin: 2em 0 .8em;
  letter-spacing: .05em;
}
.article-body h3 { font-size: 18px; margin: 1.6em 0 .7em; }
.article-body code {
  font-family: "JetBrains Mono", "Courier New", monospace;
  font-size: .88em;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 6px;
}
.article-body pre {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px 18px;
  overflow-x: auto;
  line-height: 1.6;
}
.article-body pre code {
  background: none;
  border: none;
  padding: 0;
}
.article-body ul, .article-body ol { padding-left: 1.6em; }
.article-body li { margin: .35em 0; }
.article-body hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2.2em auto;
  width: 42%;
}

/* StreamField 代码块 */
.code-block { margin: 1.6em 0; }
.code-block pre {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px 18px;
  overflow-x: auto;
  line-height: 1.6;
  margin: 0;
}
.code-block pre code {
  font-family: "JetBrains Mono", "Courier New", monospace;
  font-size: .88em;
}
.code-block figcaption {
  font-size: 13px;
  color: var(--ink-faint);
  text-align: center;
  margin-top: 8px;
}

/* Markdown：表格 / 代码高亮容器 */
.article-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.6em 0;
  font-size: .95em;
}
.article-body th, .article-body td {
  border: 1px solid var(--line);
  padding: 6px 12px;
  text-align: left;
}
.article-body th { background: var(--card); }
.article-body .codehilite { margin: 1.6em 0; }
.article-body .codehilite pre { margin: 0; }

/* 富文本图片：对齐/宽度（wagtail image format 的 class） */
.richtext-image { height: auto; border-radius: 8px; }
.richtext-image--left { float: left; max-width: 48%; margin: 4px 1.4em 1em 0; }
.richtext-image--right { float: right; max-width: 48%; margin: 4px 0 1em 1.4em; }
.richtext-image--center { display: block; margin: 1.6em auto; max-width: 100%; }
.richtext-image--full { display: block; width: 100%; margin: 1.6em 0; }
.article-body::after { content: ""; display: table; clear: both; }

.article-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 44px 0 10px;
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
  font-size: 15px;
}
.article-nav a { max-width: 48%; }
.article-nav .next { text-align: right; margin-left: auto; }
.article-nav .label {
  display: block;
  font-size: 12.5px;
  color: var(--ink-faint);
  letter-spacing: .2em;
  margin-bottom: 2px;
}

.back-home {
  display: inline-block;
  margin-top: 40px;
  font-size: 14.5px;
  border-bottom: none;
  color: var(--ink-soft);
}
.back-home:hover { color: var(--accent); }

.empty-hint { color: var(--ink-faint); text-align: center; margin: 40px 0; }

/* ---------- 页脚 ---------- */
.site-footer {
  margin: 70px 0 0;
  padding: 26px 0 34px;
  border-top: 1px solid var(--line);
  text-align: center;
  font-size: 13.5px;
  color: var(--ink-faint);
  line-height: 2;
}
.site-footer a { border-bottom: none; color: var(--ink-soft); }
.site-footer a:hover { color: var(--accent); }
.site-footer .sep { margin: 0 10px; color: var(--line); }

/* ---------- 小屏适配 ---------- */
@media (max-width: 560px) {
  body { font-size: 16px; }
  .hero .title h1 { font-size: 30px; }
  .article-header h1 { font-size: 24px; }
  .site-nav .links a { margin-left: 14px; }
  .article-nav { flex-direction: column; }
  .article-nav .next { text-align: left; }
}