:root{
  --paper:#F3EFE4;
  --paper-2:#EAE4D4;
  --ink:#2B2A26;
  --ink-soft:#5A564C;
  --jade:#5E6E4F;
  --clay:#A66B4F;
  --line:#D7CFB9;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,.brush{
  font-family:"Songti SC","STSong","SimSun","Noto Serif SC",serif;
  font-weight:600;
  color:var(--ink);
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* ---- layout shell ---- */
.wrap{max-width:860px;margin:0 auto;padding:0 28px}

header.site{
  border-bottom:1px solid var(--line);
  position:sticky;top:0;background:var(--paper);z-index:10;
}
header.site .wrap{
  display:flex;align-items:center;justify-content:space-between;
  height:72px;
}
.logo{font-family:"Songti SC","STSong",serif;font-size:20px;letter-spacing:.04em}
.logo span{color:var(--jade)}
nav.main ul{display:flex;list-style:none;gap:30px}
nav.main a{font-size:15px;color:var(--ink-soft);padding:4px 0;border-bottom:1px solid transparent}
nav.main a:hover,nav.main a.active{color:var(--ink);border-color:var(--jade)}
.nav-toggle{display:none;background:none;border:none;font-size:22px;color:var(--ink);cursor:pointer}

@media(max-width:720px){
  nav.main{
    position:absolute;top:72px;left:0;right:0;background:var(--paper);
    border-bottom:1px solid var(--line);
    max-height:0;overflow:hidden;transition:max-height .3s ease;
  }
  nav.main.open{max-height:320px}
  nav.main ul{flex-direction:column;gap:0;padding:8px 0}
  nav.main a{display:block;padding:14px 28px;border-bottom:1px solid var(--line)}
  .nav-toggle{display:block}
}

/* ---- hero ---- */
.hero{padding:96px 0 72px;text-align:center;position:relative}
.hero .mark{
  width:1px;height:48px;background:var(--jade);margin:0 auto 28px;
}
.hero h1{font-size:clamp(28px,4.4vw,42px);line-height:1.5;letter-spacing:.02em}
.hero p.sub{
  margin-top:20px;color:var(--ink-soft);font-size:16px;
  max-width:560px;margin-left:auto;margin-right:auto;
}

.hero.page{padding:64px 0 48px;text-align:left}
.hero.page .mark{margin:0 0 20px}
.hero.page h1{font-size:clamp(26px,4vw,36px)}
.hero.page p.sub{margin-left:0;margin-right:0;max-width:640px}

/* ---- pillars grid on home ---- */
.pillars{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:var(--line);border:1px solid var(--line);
  margin:40px 0 80px;
}
.pillars a{
  background:var(--paper);padding:36px 22px;text-align:center;
  display:flex;flex-direction:column;gap:10px;
}
.pillars a:hover{background:var(--paper-2)}
.pillars .ci{font-size:26px;color:var(--jade)}
.pillars h3{font-size:17px}
.pillars p{font-size:13px;color:var(--ink-soft);line-height:1.6}
@media(max-width:720px){.pillars{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.pillars{grid-template-columns:1fr}}

/* ---- section / article blocks ---- */
section.block{padding:52px 0;border-top:1px solid var(--line)}
section.block:first-of-type{border-top:none}
section.block h2{font-size:22px;margin-bottom:8px}
section.block .lead{color:var(--ink-soft);font-size:15px;margin-bottom:28px;max-width:620px}

.cards{display:grid;grid-template-columns:1fr 1fr;gap:28px}
@media(max-width:640px){.cards{grid-template-columns:1fr}}
.card{padding-bottom:4px}
.card h4{font-size:16px;margin-bottom:8px}
.card p{font-size:14px;color:var(--ink-soft)}
.card .tag{font-size:12px;color:var(--clay);margin-bottom:6px;display:block}

.quote{
  border-left:2px solid var(--jade);padding:4px 0 4px 22px;
  margin:36px 0;color:var(--ink-soft);font-size:15px;font-style:normal;
}

/* ---- contact ---- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;padding:48px 0 80px}
@media(max-width:640px){.contact-grid{grid-template-columns:1fr}}
.field{margin-bottom:20px}
.field label{display:block;font-size:13px;color:var(--ink-soft);margin-bottom:6px}
.field input,.field textarea{
  width:100%;border:1px solid var(--line);background:var(--paper-2);
  padding:12px 14px;font-size:14px;font-family:inherit;color:var(--ink);
}
.field textarea{resize:vertical;min-height:120px}
button.submit{
  background:var(--ink);color:var(--paper);border:none;
  padding:13px 30px;font-size:14px;cursor:pointer;letter-spacing:.03em;
}
button.submit:hover{background:var(--jade)}
.info-list{list-style:none}
.info-list li{padding:14px 0;border-bottom:1px solid var(--line);font-size:14px}
.info-list span{display:block;color:var(--ink-soft);font-size:12px;margin-bottom:4px}

/* ---- footer ---- */
footer.site{border-top:1px solid var(--line);padding:32px 0;margin-top:40px}
footer.site .wrap{
  display:flex;justify-content:space-between;align-items:center;
  font-size:13px;color:var(--ink-soft);flex-wrap:wrap;gap:10px;
}

:focus-visible{outline:2px solid var(--jade);outline-offset:2px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}nav.main{transition:none}}