/* 青瓷灰底 + 墨色文字 + 印泥红「封」章（只用于加密标记） */
:root {
  --bg: #eef1ef;
  --paper: #f7f9f8;
  --fg: #1d2523;
  --muted: #68746f;
  --line: #d3dad7;
  --accent: #2c6a60;
  --seal: #b3382c;
  --code: #e3e9e6;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111615;
    --paper: #171d1c;
    --fg: #e4eae7;
    --muted: #93a09a;
    --line: #2a3331;
    --accent: #7cc4b5;
    --seal: #e0675a;
    --code: #1f2826;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.9 var(--serif);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* 头尾 */
.site-head, .site-foot, .wrap { width: min(100% - 2.5rem, 42rem); margin-inline: auto; }
.site-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
  padding: 1.6rem 0 1.2rem; border-bottom: 1px solid var(--line); font-family: var(--sans);
}
.brand { font: 700 1.15rem/1 var(--serif); color: var(--fg); text-decoration: none; letter-spacing: .08em; }
.site-head nav { display: flex; gap: 1.2rem; font-size: .9rem; }
.site-head nav a { color: var(--muted); text-decoration: none; }
.site-head nav a:hover, .site-head nav a[aria-current] { color: var(--fg); }
.site-foot {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem;
  margin-top: 5rem; padding: 1.4rem 0 3rem; border-top: 1px solid var(--line);
  color: var(--muted); font: .82rem/1.6 var(--sans);
}
.wrap { padding-top: 2.5rem; min-height: 60vh; }

/* 首页 / 列表 */
.hero { padding: 1.5rem 0 2.2rem; }
.hero h1 { margin: 0; font-size: clamp(2.1rem, 7vw, 3rem); line-height: 1.25; letter-spacing: .06em; }
.hero p { margin: .8rem 0 0; color: var(--muted); }
.hero-sm h1 { font-size: 1.8rem; }

.entries { list-style: none; margin: 0; padding: 0; }
.entry {
  display: grid; grid-template-columns: 6.2rem 1fr; gap: 1rem;
  padding: 1.1rem 0; border-top: 1px solid var(--line);
}
.entry time { color: var(--muted); font: .85rem/2.3 var(--sans); font-variant-numeric: tabular-nums; }
.entry h2 { margin: 0; font-size: 1.2rem; line-height: 1.6; }
.entry h2 a { color: var(--fg); text-decoration: none; }
.entry h2 a:hover { color: var(--accent); }
.entry p { margin: .2rem 0 0; color: var(--muted); font-size: .95rem; line-height: 1.8; }
.entry.is-sticky { background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 9%, transparent), transparent 70%); }
.empty { padding: 2rem 0; color: var(--muted); }
@media (max-width: 520px) { .entry { grid-template-columns: 1fr; gap: 0; } .entry time { line-height: 1.6; } }

.pager { display: flex; justify-content: center; align-items: center; gap: 1.5rem; margin-top: 2rem; font: .9rem var(--sans); color: var(--muted); }

/* 「封」章：加密标记 */
.seal {
  display: inline-grid; place-items: center; width: 1.35em; height: 1.35em; margin-left: .5em;
  border: 1.5px solid var(--seal); border-radius: 3px; color: var(--seal);
  font: 700 .7rem/1 var(--serif); vertical-align: .1em; transform: rotate(-4deg);
}

/* 文章 */
.post-head h1 { margin: 0 0 .6rem; font-size: clamp(1.8rem, 6vw, 2.4rem); line-height: 1.35; }
.meta { margin: 0 0 2rem; color: var(--muted); font: .88rem/1.8 var(--sans); }
.meta .tag { margin-left: .8rem; text-decoration: none; }
.meta .tag::before { content: "#"; }

.prose > :first-child { margin-top: 0; }
.prose p { margin: 1.1em 0; }
.prose h2, .prose h3 { margin: 2em 0 .6em; line-height: 1.45; }
.prose h2 { font-size: 1.4rem; }
.prose h3 { font-size: 1.15rem; }
.prose img { max-width: 100%; height: auto; }
.prose blockquote { margin: 1.4em 0; padding: .1em 1.1em; border-left: 3px solid var(--accent); color: var(--muted); }
.prose code { padding: .12em .4em; background: var(--code); border-radius: 3px; font: .86em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.prose pre { overflow-x: auto; padding: 1rem 1.2rem; background: var(--code); border-radius: 4px; line-height: 1.6; }
.prose pre code { padding: 0; background: none; }
.prose table { display: block; overflow-x: auto; border-collapse: collapse; font: .92rem/1.6 var(--sans); }
.prose th, .prose td { padding: .5rem .9rem; border: 1px solid var(--line); text-align: left; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }
.prose-locked { margin-top: 0; animation: reveal .35s ease-out; }
@keyframes reveal { from { opacity: 0; } to { opacity: 1; } }

/* 解锁框：横贯正文的封缄线，中间压一枚章 */
.lock { margin: 2.5rem 0; text-align: center; font-family: var(--sans); }
.lock[hidden] { display: none; }
.lock-rule { position: relative; height: 1.6rem; margin-bottom: .8rem; }
.lock-rule::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; border-top: 1.5px dashed var(--seal); opacity: .6; }
.lock-rule .seal {
  position: absolute; left: 50%; top: 50%; margin: 0; width: 1.9rem; height: 1.9rem; font-size: 1rem;
  background: var(--bg); transform: translate(-50%, -50%) rotate(-4deg);
}
.lock-hint { margin: 0 0 1rem; color: var(--muted); font-size: .92rem; }
.lock-form { display: flex; justify-content: center; gap: .6rem; }
.lock-form input {
  width: min(100%, 15rem); padding: .6rem .8rem; border: 1px solid var(--line); border-radius: 4px;
  background: var(--paper); color: var(--fg); font: 1rem var(--sans);
}
.lock-form button {
  padding: .6rem 1.3rem; border: 0; border-radius: 4px; background: var(--accent); color: var(--bg);
  font: 600 1rem var(--sans); cursor: pointer;
}
.lock-form button:disabled { opacity: .55; cursor: progress; }
.lock-msg { min-height: 1.6em; margin: .8rem 0 0; color: var(--seal); font-size: .88rem; }

@media (prefers-reduced-motion: reduce) { .prose-locked { animation: none; } }