:root {
  --paper: #fbfaf8;
  --paper-soft: #f4f1ea;
  --ink: #1b1a18;
  --ink-soft: #55514a;
  --ink-faint: #7d7972;
  --rule: #e3dfd7;
  --seal: #9c2b1f;
  --seal-soft: rgba(156, 43, 31, .12);
  --band: #171614;
  --gold: #8a6a2f;
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "SimSun", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "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: 1rem;
  line-height: 1.9;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--seal); text-decoration: none; border-bottom: 1px solid rgba(156, 43, 31, .32); }
a:hover { border-bottom-color: var(--seal); }

img { max-width: 100%; display: block; }

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 100;
  background: var(--paper);
  padding: .5rem .8rem;
}

/* ---------- top bar ---------- */

.topbar {
  background: var(--band);
  color: #f2efe9;
}

.topbar-inner {
  max-width: 68rem;
  margin: 0 auto;
  padding: .85rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .35rem 1.25rem;
}

.brand {
  font-family: var(--serif);
  font-size: 1.06rem;
  letter-spacing: .1em;
  color: #f2efe9;
  border: 0;
  white-space: nowrap;
}

.brand small {
  display: block;
  font-family: var(--sans);
  font-size: .68rem;
  letter-spacing: .14em;
  color: #a9a49a;
  margin-top: .1rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: .2rem .95rem;
  margin-left: auto;
  font-size: .86rem;
}

.nav a {
  color: #d9d4ca;
  border: 0;
  padding: .15rem 0;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: #fff;
  border-bottom: 1px solid var(--seal);
}

/* ---------- layout ---------- */

.wrap {
  max-width: 68rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.narrow {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

main { display: block; }

.hero {
  padding: 4.5rem 0 3.5rem;
  border-bottom: 1px solid var(--rule);
}

.eyebrow {
  font-size: .78rem;
  letter-spacing: .18em;
  color: var(--seal);
  text-transform: uppercase;
  margin: 0 0 .9rem;
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: .01em;
  margin: 0 0 1rem;
  max-width: 18ch;
}

.hero .sub {
  font-family: var(--serif);
  font-size: 1.08rem;
  color: var(--ink-soft);
  max-width: 34rem;
  margin: 0 0 1.75rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1rem;
  align-items: center;
}

.btn {
  display: inline-block;
  background: var(--seal);
  color: #fff;
  border: 1px solid var(--seal);
  padding: .68rem 1.2rem;
  font-size: .94rem;
  line-height: 1.4;
  border-radius: 3px;
}

.btn:hover { background: #842319; border-color: #842319; }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}

.btn-ghost:hover { background: var(--ink); color: var(--paper); }

.section {
  padding: 3.25rem 0;
  border-bottom: 1px solid var(--rule);
}

.section:last-of-type { border-bottom: 0; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .4rem 1rem;
  margin-bottom: 1.75rem;
}

.section-head h2 {
  font-family: var(--serif);
  font-size: 1.5rem;
  line-height: 1.5;
  margin: 0;
}

.section-head p {
  margin: 0;
  color: var(--ink-faint);
  font-size: .88rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 0;
  border-top: 1px solid var(--rule);
}

.grid-3 > article {
  padding: 1.5rem 1.5rem 1.5rem 0;
  border-bottom: 1px solid var(--rule);
}

@media (min-width: 52rem) {
  .grid-3 > article + article {
    border-left: 1px solid var(--rule);
    padding-left: 1.5rem;
  }
}

.grid-3 h3 {
  font-family: var(--serif);
  font-size: 1.15rem;
  margin: 0 0 .55rem;
}

.grid-3 p {
  margin: 0 0 .8rem;
  color: var(--ink-soft);
  font-size: .95rem;
}

.grid-3 .more {
  font-size: .88rem;
}

.num {
  font-family: var(--serif);
  color: var(--seal);
  font-size: .82rem;
  letter-spacing: .12em;
  display: block;
  margin-bottom: .35rem;
}

/* ---------- article body ---------- */

.article {
  max-width: 46rem;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

.article h1 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  line-height: 1.5;
  margin: 0 0 .9rem;
}

.article .meta {
  font-size: .85rem;
  color: var(--ink-faint);
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 2rem;
}

.article h2 {
  font-family: var(--serif);
  font-size: 1.25rem;
  margin: 2.5rem 0 1rem;
  padding-left: .7rem;
  border-left: 3px solid var(--seal);
  line-height: 1.6;
}

.article h3 {
  font-size: 1.02rem;
  margin: 1.75rem 0 .5rem;
}

.article p { margin: 0 0 1.1rem; }

.lead {
  font-family: var(--serif);
  font-size: 1.04rem;
  background: var(--paper-soft);
  border-left: 3px solid var(--seal);
  padding: 1rem 1.15rem;
  margin: 0 0 1.75rem;
}

.note,
.boundary {
  background: var(--paper-soft);
  padding: 1rem 1.15rem;
  margin: 1.75rem 0;
  font-size: .93rem;
  color: var(--ink-soft);
}

.boundary { border-left: 3px solid var(--gold); }

.closing {
  font-family: var(--serif);
  font-size: 1.05rem;
  text-align: center;
  color: var(--seal);
  margin: 2.5rem 0 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1rem;
  margin: 2rem 0 0;
}

/* ---------- lists ---------- */

.rule-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.rule-list li {
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--rule);
}

.rule-list li:first-child { border-top: 1px solid var(--rule); }

.rule-list b {
  font-family: var(--serif);
  font-size: 1.05rem;
  display: inline-block;
  min-width: 5.5rem;
}

.rule-list span { color: var(--ink-soft); }

/* ---------- sancai tool ---------- */

.tool {
  background: var(--paper-soft);
  border: 1px solid var(--rule);
  padding: 1.5rem 1.35rem;
  margin: 2rem 0;
}

.tool h2 { margin-top: 0; border: 0; padding-left: 0; }

.dim {
  margin: 1.5rem 0 0;
}

.dim h3 {
  font-family: var(--serif);
  font-size: 1.02rem;
  margin: 0 0 .6rem;
}

.q {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem .75rem;
  align-items: baseline;
  padding: .55rem 0;
  border-bottom: 1px dashed var(--rule);
}

.q p {
  flex: 1 1 16rem;
  margin: 0;
  font-size: .93rem;
}

.q label {
  font-size: .86rem;
  color: var(--ink-soft);
  white-space: nowrap;
}

.q input { margin: 0 .2rem 0 .55rem; accent-color: var(--seal); }

.tool button {
  margin-top: 1.4rem;
  background: var(--seal);
  color: #fff;
  border: 1px solid var(--seal);
  padding: .65rem 1.2rem;
  font-size: .94rem;
  border-radius: 3px;
  cursor: pointer;
}

.tool button:hover { background: #842319; }

.result {
  margin-top: 1.4rem;
  padding: 1.1rem 1.15rem;
  background: #fff;
  border-left: 3px solid var(--seal);
  display: none;
}

.result.show { display: block; }

.result b { font-family: var(--serif); }

/* ---------- article list ---------- */

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-list li {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--rule);
}

.post-list li:first-child { border-top: 1px solid var(--rule); }

.post-list time {
  font-size: .8rem;
  color: var(--ink-faint);
  letter-spacing: .06em;
}

.post-list h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  margin: .35rem 0 .5rem;
}

.post-list p {
  margin: 0;
  color: var(--ink-soft);
  font-size: .94rem;
}

/* ---------- footer ---------- */

.footer {
  background: var(--band);
  color: #a9a49a;
  font-size: .83rem;
  line-height: 1.85;
  padding: 2rem 1.25rem 2.5rem;
  margin-top: 2rem;
}

.footer-inner {
  max-width: 68rem;
  margin: 0 auto;
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
}

.footer a { color: #e3ddd2; border-bottom-color: rgba(227, 221, 210, .35); }

.footer h3 {
  font-family: var(--serif);
  color: #f2efe9;
  font-size: .95rem;
  margin: 0 0 .5rem;
}

.footer p { margin: 0; }

.footer .compliance {
  grid-column: 1 / -1;
  border-top: 1px solid #33312c;
  padding-top: 1.2rem;
  color: #8f8a80;
}

.qr {
  width: 7.5rem;
  border: 1px solid #3a3833;
  margin-top: .5rem;
}

/* ---------- misc ---------- */

.avatar {
  width: 6.5rem;
  height: 6.5rem;
  object-fit: cover;
  border-radius: 50%;
  border: 1px solid var(--rule);
}

.about-head {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  margin-bottom: 2rem;
}

.about-head h1 {
  font-family: var(--serif);
  font-size: 1.7rem;
  margin: 0 0 .35rem;
}

.tag {
  display: inline-block;
  font-size: .78rem;
  color: var(--seal);
  border: 1px solid rgba(156, 43, 31, .35);
  padding: .05rem .5rem;
  margin: 0 .35rem .35rem 0;
  border-radius: 2px;
}

.faq-item {
  border-bottom: 1px solid var(--rule);
  padding: 1.1rem 0;
}

.faq-item:first-child { border-top: 1px solid var(--rule); }

.faq-item h3 {
  font-family: var(--serif);
  font-size: 1.02rem;
  margin: 0 0 .4rem;
}

.faq-item p { margin: 0; color: var(--ink-soft); font-size: .94rem; }

@media (max-width: 40rem) {
  .hero { padding: 3rem 0 2.5rem; }
  .nav { margin-left: 0; width: 100%; }
  .section { padding: 2.5rem 0; }
}