:root {
  --paper: #faf9f6;
  --ink: #15161a;
  --muted: #5d5f66;
  --line: #e4e1d9;
  --accent: #9a5b2c;      /* 青铜 / 赭石，克制而有质感 */
  --accent-soft: #f1e7dc;
  --card: #ffffff;
  --maxw: 760px;
  --serif: Georgia, "Times New Roman", "Songti SC", "Noto Serif SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

/* ---------- NAV ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  background: rgba(250, 249, 246, 0.86);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav__brand {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-decoration: none;
}
.nav__links a {
  margin-left: 22px;
  text-decoration: none;
  color: var(--muted);
  font-size: 15px;
  transition: color 0.2s;
}
.nav__links a:hover { color: var(--ink); }

/* ---------- LAYOUT ---------- */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px 40px;
}

/* ---------- HERO ---------- */
.hero {
  padding: 84px 0 56px;
  border-bottom: 1px solid var(--line);
}
.hero__eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
}
.hero__name {
  font-family: var(--serif);
  font-size: clamp(56px, 12vw, 92px);
  line-height: 1;
  margin: 0 0 22px;
  font-weight: 700;
}
.hero__tagline {
  font-size: 20px;
  line-height: 1.7;
  margin: 0 0 26px;
  max-width: 620px;
  color: #2a2b30;
}
.hero__tagline strong { color: var(--accent); font-weight: 600; }
.hero__meta {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.3px;
}
.hero__meta .dot { margin: 0 8px; color: var(--line); }

/* ---------- SECTIONS ---------- */
.section { padding: 56px 0; border-bottom: 1px solid var(--line); }
.section:last-of-type { border-bottom: none; }
.section__title {
  font-family: var(--serif);
  font-size: 30px;
  margin: 0 0 8px;
  font-weight: 700;
}
.section__lead { color: var(--muted); margin: 0 0 28px; }

/* ---------- ABOUT ---------- */
.about p { margin: 0 0 18px; }
.about p strong { font-weight: 600; }
.about__chips { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  font-size: 13px;
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: var(--card);
}

/* ---------- POSTS ---------- */
.posts { list-style: none; margin: 0; padding: 0; }
.post { border-top: 1px solid var(--line); }
.post:last-child { border-bottom: 1px solid var(--line); }
.post a {
  display: grid;
  grid-template-columns: 110px 1fr auto;
  grid-template-areas: "date title tag" "date excerpt tag";
  gap: 2px 20px;
  padding: 22px 4px;
  text-decoration: none;
  transition: background 0.2s;
}
.post a:hover { background: var(--accent-soft); }
.post__date { grid-area: date; color: var(--muted); font-size: 13px; padding-top: 4px; }
.post__date .lang { display: inline-block; margin-top: 5px; }
.post__title {
  grid-area: title;
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 700;
  color: var(--ink);
}
.post__excerpt { grid-area: excerpt; color: var(--muted); font-size: 15px; }
.post__tag {
  grid-area: tag;
  align-self: start;
  font-size: 12px;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 3px 11px;
  white-space: nowrap;
}

/* ---------- TOOLS ---------- */
.tools { display: grid; grid-template-columns: 1fr; gap: 16px; }
.tool {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px 24px;
  transition: border-color 0.2s, transform 0.2s;
}
.tool:hover { border-color: var(--accent); transform: translateY(-2px); }
.tool__head { display: flex; align-items: center; justify-content: space-between; }
.tool__head h3 { font-family: var(--serif); font-size: 22px; margin: 0; }
.tool__stars {
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 10px;
  border-radius: 999px;
}
.tool p { color: var(--muted); margin: 12px 0 14px; font-size: 15px; }
.tool__link { color: var(--accent); text-decoration: none; font-size: 14px; font-weight: 600; }
.tool__link:hover { text-decoration: underline; }

/* ---------- CONTACT ---------- */
.contact { list-style: none; padding: 0; margin: 0; }
.contact li { padding: 8px 0; border-bottom: 1px solid var(--line); }
.contact a { color: var(--accent); text-decoration: none; }
.contact a:hover { text-decoration: underline; }

/* ---------- FOOTER ---------- */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 30px 28px 60px;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 13px;
}

/* ---------- POST PAGE ---------- */
.post-page { padding-top: 48px; }
.post-page__title {
  font-family: var(--serif);
  font-size: clamp(30px, 6vw, 42px);
  line-height: 1.2;
  margin: 8px 0 28px;
  font-weight: 700;
}
.post-page h2 {
  font-family: var(--serif);
  font-size: 24px;
  margin: 38px 0 12px;
  font-weight: 700;
}
.post-page p { margin: 0 0 18px; }
.post-page ol, .post-page ul { padding-left: 22px; margin: 0 0 18px; }
.post-page li { margin-bottom: 10px; }
.post-page code {
  background: var(--accent-soft);
  padding: 2px 6px;
  border-radius: 5px;
  font-size: 0.9em;
  font-family: "SFMono-Regular", Consolas, monospace;
}
.tbl {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0 24px;
  font-size: 15px;
}
.tbl th, .tbl td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: right;
}
.tbl th:first-child, .tbl td:first-child { text-align: left; }
.tbl th { background: var(--accent-soft); font-weight: 600; }
.tbl__mid td { font-weight: 700; background: #faf4ec; }

/* ---------- GROUP HEADING ---------- */
.group { margin-top: 34px; }
.group:first-child { margin-top: 0; }
.group__title {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 4px;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.group__title span {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 400;
  color: var(--muted);
}
.group__lead { color: var(--muted); font-size: 14px; margin: 0 0 14px; }

/* ---------- CARDS ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s, transform 0.2s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card__head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.card__head h3 { font-family: var(--serif); font-size: 19px; margin: 0; }
.card__pill {
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}
.card p { color: var(--muted); font-size: 14.5px; margin: 10px 0 14px; }
.card__links { margin-top: auto; display: flex; gap: 16px; font-size: 14px; }
.card__links a { color: var(--accent); text-decoration: none; font-weight: 600; }
.card__links a:hover { text-decoration: underline; }

/* ---------- ARTICLE LIST (writing page) ---------- */
.metaline {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
  margin-top: 6px;
}
.lang {
  font-size: 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 1px 8px;
  color: var(--muted);
}
.more {
  display: inline-block;
  margin-top: 26px;
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  font-size: 15px;
}
.more:hover { text-decoration: underline; }
.backlink { color: var(--accent); text-decoration: none; font-size: 14px; }
.backlink:hover { text-decoration: underline; }

/* ---------- TIMELINE ---------- */
.timeline {
  margin: 28px 0 0;
  padding: 0 0 0 18px;
  border-left: 2px solid var(--line);
  list-style: none;
  display: grid;
  gap: 13px;
}
.timeline li {
  display: grid;
  grid-template-columns: 168px 1fr;
  gap: 16px;
  align-items: baseline;
}
.timeline__role { font-size: 15px; font-weight: 600; color: var(--ink); }
.timeline__note { font-size: 14px; color: var(--muted); }
a.chip { text-decoration: none; }
a.chip:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- LANG SWITCH ---------- */
.lang-switch {
  margin-left: 22px;
  display: inline-flex;
  align-items: center;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}
.lang-switch a {
  margin-left: 0;
  padding: 4px 12px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}
.lang-switch a + a { border-left: 1px solid var(--line); }
.lang-switch a:hover { color: var(--ink); background: rgba(0,0,0,0.03); }
.lang-switch a.is-active { color: #fff; background: var(--ink); }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 600px) {
  .timeline li { grid-template-columns: 1fr; gap: 2px; }
}
@media (max-width: 600px) {
  body { font-size: 16px; }
  .post a {
    grid-template-columns: 1fr;
    grid-template-areas: "date" "title" "excerpt" "tag";
    gap: 6px;
  }
  .post__tag { justify-self: start; }
  .nav__links a { margin-left: 14px; font-size: 14px; }
  .footer { flex-direction: column; gap: 6px; }
}