/* ============================================================
   我的学习 —— 样式表
   无外部依赖：系统字体 + 本地图片，可离线渲染
   ============================================================ */
:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --fg: #1b1f24;
  --fg-soft: #454c55;
  --muted: #6b7279;
  --line: #e7e5e0;
  --line-soft: #f0eeea;
  --accent: #2f6feb;
  --accent-soft: #eaf0fe;
  --code-bg: #f3f2ef;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 24, 30, .04), 0 8px 24px rgba(20, 24, 30, .05);
  --shadow-hover: 0 2px 6px rgba(20, 24, 30, .06), 0 14px 36px rgba(20, 24, 30, .10);
  --max: 66rem;      /* 列表/网格宽度 */
  --prose: 42rem;    /* 正文栏宽度 */
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1013;
    --surface: #15181d;
    --fg: #e6e8ec;
    --fg-soft: #c3c8d0;
    --muted: #9aa1ac;
    --line: #252a31;
    --line-soft: #1d2126;
    --accent: #79a6ff;
    --accent-soft: #17233a;
    --code-bg: #1a1e24;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    --shadow-hover: 0 2px 6px rgba(0, 0, 0, .35), 0 14px 36px rgba(0, 0, 0, .35);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.75 system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }
.narrow { max-width: var(--prose); margin: 0 auto; }

/* ---------------- 顶栏 ---------------- */
.site-head {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.6) blur(10px);
  border-bottom: 1px solid var(--line-soft);
}
.site-head .inner {
  max-width: var(--max); margin: 0 auto; padding: .7rem 1.25rem;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: .55rem; font-weight: 700;
  color: var(--fg); font-size: 1.02rem; letter-spacing: .01em; }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 50%; }
.brand span small { display: block; font-weight: 400; font-size: .72rem;
  color: var(--muted); letter-spacing: .04em; }
.site-head nav { display: flex; gap: .3rem; flex-wrap: wrap; }
.site-head nav a {
  color: var(--muted); font-size: .92rem; padding: .3rem .7rem; border-radius: 8px;
}
.site-head nav a:hover { color: var(--fg); background: var(--line-soft); text-decoration: none; }
.site-head nav a.active { color: var(--accent); background: var(--accent-soft); }

/* ---------------- 首页大图 ---------------- */
.hero {
  position: relative; margin: 1.5rem auto 2.5rem; border-radius: 20px;
  overflow: hidden; box-shadow: var(--shadow);
  background: #2a2f36 url("/assets/img/hero.jpg") center/cover no-repeat;
  min-height: 340px; display: flex; align-items: flex-end;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(8, 11, 16, .30) 0%, rgba(8, 11, 16, .48) 45%, rgba(8, 11, 16, .86) 100%);
}
.hero .hero-inner { position: relative; z-index: 1; padding: 2.4rem 2.2rem; color: #fff; width: 100%; }
.hero h1 { margin: 0 0 .5rem; font-size: 2.15rem; line-height: 1.25; letter-spacing: .01em;
  text-shadow: 0 2px 18px rgba(0, 0, 0, .35); }
.hero p { margin: 0; max-width: 34rem; color: rgba(255, 255, 255, .84); font-size: 1rem; text-shadow: 0 1px 10px rgba(0, 0, 0, .3); }
.hero .hero-tags { margin-top: 1.1rem; display: flex; gap: .5rem; flex-wrap: wrap; }
.hero .hero-tags span {
  font-size: .8rem; padding: .22rem .7rem; border-radius: 999px;
  background: rgba(255, 255, 255, .16); color: #fff; backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, .18);
}

/* ---------------- 区块标题 ---------------- */
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1rem; margin: 0 0 1.1rem;
}
.section-head h2 { margin: 0; font-size: 1.15rem; letter-spacing: .02em; }
.section-head .more { font-size: .88rem; color: var(--muted); }

/* ---------------- 文章卡片 ---------------- */
.list { display: grid; grid-template-columns: repeat(auto-fill, minmax(288px, 1fr)); gap: 1.3rem; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: transparent; }
.card .thumb { display: block; aspect-ratio: 16 / 10; overflow: hidden; background: var(--code-bg); }
.card .thumb img, .post-cover img, .gallery img { background: var(--code-bg); }
.card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
.card:hover .thumb img { transform: scale(1.035); }
.card .body { padding: 1.05rem 1.15rem 1.2rem; display: flex; flex-direction: column; flex: 1; }
.card h2 { margin: 0 0 .4rem; font-size: 1.1rem; line-height: 1.45;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card h2 a { color: var(--fg); }
.card h2 a:hover { color: var(--accent); text-decoration: none; }
.card .meta { margin: 0 0 .5rem; color: var(--muted); font-size: .82rem; }
.card .summary { margin: 0; color: var(--fg-soft); font-size: .93rem;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card .tags { margin-top: auto; padding-top: .8rem; }
.tag { color: var(--muted); font-size: .8rem; margin-right: .5rem; white-space: nowrap; }
.tag:hover { color: var(--accent); text-decoration: none; }
.tag small { opacity: .6; }
.more-link { display: inline-block; margin: 1.8rem 0 0; font-size: .92rem; }
.tagcloud { display: flex; flex-wrap: wrap; gap: .55rem .7rem; justify-content: center; margin: 1.6rem 0 0; }
.tagpage .page-title { text-align: center; }
.tagcloud .tag {
  padding: .4rem .95rem; border: 1px solid var(--line); border-radius: 999px;
  background: var(--surface); line-height: 1.2;
}
.tagcloud .tag:hover { border-color: var(--accent); text-decoration: none; }

/* ---------------- 正文 ---------------- */
.post-head { margin: 2.2rem 0 0; }
.post-head h1 { font-size: 2rem; line-height: 1.35; margin: 0 0 .7rem; letter-spacing: .01em; }
.post-head .meta { color: var(--muted); font-size: .88rem; margin: 0; }
.post-cover { margin: 1.6rem 0 0; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.post-cover img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.prose { margin-top: 2rem; font-size: 1.03rem; }
.prose h2 { font-size: 1.34rem; margin: 2.4rem 0 .8rem; padding-left: .7rem; border-left: 3px solid var(--accent); line-height: 1.4; }
.prose h3 { font-size: 1.12rem; margin: 1.9rem 0 .6rem; }
.prose p { margin: 0 0 1.1rem; }
.prose ul, .prose ol { padding-left: 1.35rem; margin: 0 0 1.1rem; }
.prose li { margin: .35rem 0; }
.prose img { border-radius: 10px; margin: 1.4rem 0; }
.prose blockquote {
  margin: 0 0 1.1rem; padding: .8rem 1rem; border-radius: 10px;
  border-left: 3px solid var(--accent); background: var(--accent-soft); color: var(--fg-soft);
}
.prose blockquote p { margin: 0; }
.prose code {
  background: var(--code-bg); padding: .14em .4em; border-radius: 5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .88em;
}
.prose pre {
  position: relative;
  background: var(--code-bg); border: 1px solid var(--line); padding: 1.35rem 1.1rem 1rem;
  border-radius: 12px; overflow-x: auto; margin: 0 0 1.1rem; line-height: 1.65;
}
.prose pre[data-lang]::after {
  content: attr(data-lang); position: absolute; top: .45rem; right: .7rem;
  font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.prose pre code { background: none; padding: 0; font-size: .86rem; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.2rem 0; }
.prose table { width: 100%; border-collapse: collapse; margin: 0 0 1.1rem; font-size: .94rem; }
.prose th, .prose td { border: 1px solid var(--line); padding: .5rem .65rem; text-align: left; }
.prose th { background: var(--code-bg); font-weight: 600; }
.prose a { border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); }
.prose a:hover { text-decoration: none; border-bottom-color: var(--accent); }

/* ---------------- 相册 ---------------- */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: .9rem; margin-top: 1.6rem; }
.gallery figure { margin: 0; border-radius: 12px; overflow: hidden; background: var(--surface);
  border: 1px solid var(--line); box-shadow: var(--shadow); }
.gallery img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; transition: transform .35s ease; }
.gallery figure:hover img { transform: scale(1.04); }
.gallery figcaption { padding: .55rem .7rem; font-size: .85rem; color: var(--muted); }

/* ---------------- 关于 ---------------- */
.about-photo { margin: 1.8rem 0 2rem; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.about-photo img { width: 100%; }

/* ---------------- 归档 ---------------- */
h1.page-title { font-size: 1.65rem; margin: 2.2rem 0 1.4rem; }
h2.year { font-size: .95rem; color: var(--muted); font-weight: 600; letter-spacing: .06em; margin: 1.8rem 0 .6rem; }
ul.archive { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line-soft); }
ul.archive li { display: flex; gap: .9rem; padding: .55rem 0; border-bottom: 1px solid var(--line-soft); }
ul.archive time { color: var(--muted); font-size: .85rem; font-variant-numeric: tabular-nums; flex: 0 0 3.4rem; }

/* ---------------- 文末导航 ---------------- */
.post-nav { display: flex; gap: 1rem; margin: 3.4rem 0 1rem; justify-content: space-between; }
.post-nav a {
  display: flex; flex-direction: column; gap: .2rem; max-width: 48%; font-size: .93rem;
  padding: .8rem 1rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface);
}
.post-nav a:hover { text-decoration: none; border-color: var(--accent); }
.post-nav a span { color: var(--muted); font-size: .78rem; }
.post-nav .next { text-align: right; margin-left: auto; }

/* ---------------- 页脚 ---------------- */
.site-foot { margin-top: 4rem; border-top: 1px solid var(--line); background: var(--surface); }
.site-foot .inner {
  max-width: var(--max); margin: 0 auto; padding: 2rem 1.25rem 3rem;
  color: var(--muted); font-size: .86rem;
  display: flex; flex-wrap: wrap; gap: .4rem 1.5rem; align-items: center; justify-content: space-between;
}
.site-foot nav { display: flex; gap: .9rem; flex-wrap: wrap; }
.site-foot p { margin: 0; }
.site-foot .icp { color: var(--muted); }
.site-foot .icp a { color: var(--muted); }
.notfound { text-align: center; padding: 4rem 0; }
.notfound h1 { font-size: 3.6rem; margin: 0 0 .4rem; }

/* ---------------- 自适应 ---------------- */
@media (max-width: 720px) {
  .hero { min-height: 240px; border-radius: 16px; margin: 1rem auto 1.8rem; }
  .hero .hero-inner { padding: 1.5rem 1.3rem; }
  .hero h1 { font-size: 1.5rem; }
  .hero p { font-size: .92rem; }
  .post-head h1 { font-size: 1.55rem; }
  .prose { font-size: 1rem; }
  .list { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}