/* ============================================================
   码外 — 随笔
   只有排版，没有装饰。无 JS、无框架、无外链字体。
   ============================================================ */

:root {
  --bg: #fcfbf8;
  --text: #1f1e1c;
  --text-soft: #45423d;
  --muted: #8b8781;
  --line: #e7e3da;
  --accent: #a63b2c;

  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, SimSun, serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171614;
    --text: #d9d4ca;
    --text-soft: #b3ada2;
    --muted: #7b766e;
    --line: #2b2825;
    --accent: #c9715c;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  color-scheme: light dark;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.95;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

::selection {
  background: rgba(166, 59, 44, 0.16);
}

/* ---------- 容器 ---------- */
.page {
  max-width: 660px;
  margin: 0 auto;
  padding: 0 24px 96px;
}

/* ---------- 站头 ---------- */
.masthead {
  padding: 72px 0 34px;
  border-bottom: 1px solid var(--line);
}

.masthead h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.masthead h1 a {
  transition: color 0.2s ease;
}

.masthead h1 a:hover {
  color: var(--accent);
}

.masthead p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* ---------- 列表 ---------- */
.log {
  list-style: none;
  margin: 0;
  padding: 0;
}

.log li {
  display: flex;
  gap: 20px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.log time {
  flex: 0 0 74px;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.log a {
  font-size: 17px;
  line-height: 1.6;
  transition: color 0.2s ease;
}

.log a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.log .ext::after {
  content: " ↗";
  font-size: 0.8em;
  color: var(--muted);
}

/* ---------- 文章页 ---------- */
.topnav {
  padding: 40px 0 0;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.topnav a {
  transition: color 0.2s ease;
}

.topnav a:hover {
  color: var(--accent);
}

.post-head {
  padding: 40px 0 36px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 38px;
}

.post-head h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.55;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.post-head .meta {
  margin: 14px 0 0;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.prose p {
  margin: 0 0 1.5em;
  letter-spacing: 0.01em;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose .sign {
  margin-top: 2.6em;
  color: var(--muted);
  font-size: 15px;
}

/* ---------- 页脚 ---------- */
.foot {
  margin-top: 56px;
  font-family: var(--sans);
  font-size: 12.5px;
  line-height: 1.9;
  letter-spacing: 0.03em;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- 小屏 ---------- */
@media (max-width: 560px) {
  body {
    font-size: 16.5px;
  }

  .page {
    padding: 0 20px 72px;
  }

  .masthead {
    padding: 52px 0 26px;
  }

  .log li {
    display: block;
    padding: 14px 0;
  }

  .log time {
    display: block;
    margin-bottom: 4px;
    font-size: 12.5px;
  }

  .post-head {
    padding: 28px 0 26px;
    margin-bottom: 28px;
  }

  .post-head h1 {
    font-size: 24px;
  }

  .topnav {
    padding-top: 28px;
  }
}