/* ============================================================
   dapeng.blog — 2026-11
   晴空蓝 / 暖白纸 / 宋体标题
   ============================================================ */

:root{
  --bg:#f7fbff;
  --ink:#0f2137;
  --soft:#5d7a97;
  --line:rgba(15,33,55,.10);
  --blue:#2f86e0;
  --blue-deep:#1a5fae;
  --blue-pale:#e3f0ff;
  --card:#ffffff;
  --serif:"Songti SC","Source Han Serif SC","Noto Serif CJK SC",Georgia,"Times New Roman",serif;
  --sans:"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  min-height:100vh;background:var(--bg);color:var(--ink);font-family:var(--sans);
  line-height:1.75;-webkit-font-smoothing:antialiased;position:relative;overflow-x:hidden;
}

/* ---------------- 天空 ---------------- */
.sky{
  position:absolute;inset:0 0 auto 0;height:520px;z-index:0;pointer-events:none;
  background:linear-gradient(180deg,#cfe6ff 0%,#e4f1ff 42%,rgba(247,251,255,0) 100%);
}
.sky::before,.sky::after{content:"";position:absolute;border-radius:50%;filter:blur(46px)}
.sky::before{width:520px;height:320px;left:-120px;top:-90px;background:rgba(255,255,255,.95)}
.sky::after{width:640px;height:360px;right:-160px;top:40px;background:rgba(255,255,255,.8)}

.wrap{position:relative;z-index:1;max-width:820px;margin:0 auto;padding:0 34px}

/* ---------------- 顶栏 ---------------- */
.top{display:flex;align-items:center;justify-content:space-between;padding:26px 0;gap:20px}
.mark{
  font-family:var(--serif);font-size:17px;letter-spacing:.14em;
  display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;
}
.mark b{color:var(--blue);font-weight:400}
.mark i{width:8px;height:8px;border-radius:50%;background:var(--blue);display:block;flex:0 0 auto}
.top nav{display:flex;gap:22px;font-size:12.5px;letter-spacing:.1em}
.top nav a{color:var(--soft);text-decoration:none;transition:.2s}
.top nav a:hover{color:var(--blue)}

/* ---------------- 首页 hero ---------------- */
.hero{padding:clamp(44px,8vh,80px) 0 clamp(30px,5vh,48px);text-align:center}
.hero .over{
  display:inline-block;font-family:var(--mono);font-size:10.5px;letter-spacing:.3em;
  text-transform:uppercase;color:var(--blue-deep);background:rgba(255,255,255,.72);
  border:1px solid rgba(47,134,224,.22);border-radius:999px;padding:5px 15px;margin-bottom:24px;
  backdrop-filter:blur(6px);
}
.hero h1{
  font-family:var(--serif);font-weight:400;font-size:clamp(34px,6.8vw,58px);
  line-height:1.3;letter-spacing:.03em;
}
.hero h1 em{font-style:normal;color:var(--blue);position:relative;z-index:0}
.hero h1 em::after{
  content:"";position:absolute;left:-.06em;right:-.06em;bottom:.06em;height:.34em;z-index:-1;
  background:linear-gradient(90deg,rgba(47,134,224,.20),rgba(47,134,224,.06));border-radius:2px;
}
.hero .sub{
  margin-top:20px;font-size:14.5px;color:var(--soft);
  max-width:30em;margin-left:auto;margin-right:auto;line-height:1.85;
}

/* ---------------- 区块标题 ---------------- */
.sec{display:flex;align-items:baseline;gap:12px;margin:44px 0 20px}
.sec h2{font-family:var(--serif);font-size:14.5px;letter-spacing:.34em;font-weight:400;color:var(--ink)}
.sec .n{font-family:var(--mono);font-size:10.5px;color:var(--blue);letter-spacing:.1em}
.sec .rule{flex:1;height:1px;background:linear-gradient(90deg,var(--line),transparent)}

/* ---------------- 文章卡 ---------------- */
.list{display:grid;gap:10px}
.card{
  display:block;text-decoration:none;color:inherit;position:relative;
  padding:22px 24px;border-radius:14px;
  background:rgba(255,255,255,.78);border:1px solid rgba(47,134,224,.13);
  box-shadow:0 1px 2px rgba(15,33,55,.03),0 8px 24px -16px rgba(47,134,224,.5);
  transition:.26s ease;backdrop-filter:blur(6px);
}
.card:hover{
  border-color:rgba(47,134,224,.4);transform:translateY(-2px);
  box-shadow:0 2px 4px rgba(15,33,55,.04),0 16px 34px -18px rgba(47,134,224,.75);
}
.card h2{
  font-family:var(--serif);font-size:clamp(19px,2.9vw,24px);font-weight:400;
  line-height:1.45;letter-spacing:.01em;transition:.24s;
}
.card:hover h2{color:var(--blue-deep)}
.card .meta{
  margin-top:8px;display:flex;gap:14px;align-items:baseline;flex-wrap:wrap;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;color:var(--soft);
}
.card .meta time{flex:0 0 auto}
.card .meta .sum{
  font-family:var(--sans);font-size:13px;letter-spacing:0;color:#5f7d9c;line-height:1.65;
}
.empty{
  padding:26px 24px;border-radius:14px;border:1px dashed rgba(47,134,224,.28);
  color:var(--soft);font-size:14px;text-align:center;background:rgba(255,255,255,.5);
}

/* ---------------- 关于 ---------------- */
.about{padding-bottom:10px}
.about p{font-size:15px;color:#1c334b;max-width:38em}
.about p + p{margin-top:12px}
.about p.dim{color:var(--soft)}

/* ---------------- 文章页 ---------------- */
.post-head{padding:clamp(30px,6vh,54px) 0 0}
.post-head .kicker{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.28em;text-transform:uppercase;
  color:var(--blue-deep);margin-bottom:20px;
}
.post-head h1{
  font-family:var(--serif);font-weight:400;font-size:clamp(27px,5.6vw,40px);
  line-height:1.4;letter-spacing:.02em;
}
.post-head .meta{
  margin-top:16px;padding-bottom:22px;border-bottom:1px solid var(--line);
  font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;color:var(--soft);
  display:flex;flex-wrap:wrap;align-items:center;gap:12px;
}
.post-head .tags{display:inline-flex;gap:7px;flex-wrap:wrap}
.post-head .tag{
  font-family:var(--sans);font-size:11px;letter-spacing:.06em;padding:1px 9px;
  border:1px solid rgba(47,134,224,.28);border-radius:999px;color:var(--blue-deep);
  background:rgba(227,240,255,.6);
}

article.post{padding:28px 0 10px;font-size:16.5px;line-height:1.95}
article.post > * + *{margin-top:20px}
article.post p{font-size:16.5px;max-width:none}
article.post h2{
  font-family:var(--serif);font-size:22px;line-height:1.5;letter-spacing:.02em;
  margin-top:44px;color:var(--ink);
}
article.post h3{
  font-family:var(--serif);font-size:18.5px;line-height:1.55;letter-spacing:.02em;
  margin-top:32px;color:var(--ink);
}
article.post h2 + *,article.post h3 + *{margin-top:12px}
article.post a{
  color:var(--blue-deep);text-decoration:none;
  border-bottom:1px solid rgba(47,134,224,.35);transition:.2s;
}
article.post a:hover{border-bottom-color:currentColor}
article.post strong{font-weight:600}
article.post blockquote{
  border-left:2px solid var(--blue);padding:2px 0 2px 18px;color:var(--soft);
}
article.post blockquote p{font-size:16px}
article.post ul,article.post ol{padding-left:1.35em}
article.post li{font-size:16.5px;margin-top:8px}
article.post li::marker{color:var(--blue)}
article.post hr{border:0;border-top:1px solid var(--line);margin:36px 0}
article.post code{
  font-family:var(--mono);font-size:.88em;background:rgba(47,134,224,.09);
  padding:1px 5px;border-radius:4px;
}
article.post pre{
  background:#fff;border:1px solid rgba(47,134,224,.18);border-radius:12px;
  padding:16px 18px;overflow-x:auto;
  box-shadow:0 6px 20px -14px rgba(47,134,224,.6);
}
article.post pre code{background:none;padding:0;font-size:13px;line-height:1.7}
article.post img{max-width:100%;height:auto;border-radius:10px;display:block}
article.post figure{width:100%}
article.post figcaption{
  margin-top:8px;font-size:12.5px;color:var(--soft);text-align:center;
}

/* ---------------- 页脚 ---------------- */
footer{
  margin-top:64px;padding:22px 0 52px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;
  color:var(--soft);text-transform:uppercase;
}
footer a{color:var(--soft);text-decoration:none;text-transform:none;letter-spacing:.06em}
footer a:hover{color:var(--blue)}

@media (max-width:640px){
  .wrap{padding:0 22px}
  .sky{height:420px}
  .hero h1{font-size:30px}
  .card{padding:18px}
  .sec{margin:34px 0 16px}
  article.post{font-size:16px;line-height:1.9}
  article.post p,article.post li{font-size:16px}
  footer{padding-bottom:38px}
}