:root{
  --paper:#F5F1E6;
  --ink:#26231D;
  --ink-soft:#6B665A;
  --line:#D9D2C1;
  --indigo:#31405E;
  --terracotta:#B25732;
  --teal:#276358;
}

*{box-sizing:border-box;margin:0;padding:0;}

body{
  background:var(--paper);
  color:var(--ink);
  font-family:'Noto Serif TC', serif;
  line-height:1.7;
}

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

.eyebrow{
  font-family:'Oswald', sans-serif;
  font-size:12px;
  letter-spacing:0.22em;
  color:var(--ink-soft);
  text-transform:uppercase;
}

/* ====== 頁首 ====== */
.site-header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:24px 48px;
  border-bottom:1px solid var(--ink);
}
.site-header .logo{
  font-size:22px;
  font-weight:700;
  letter-spacing:0.08em;
}
.site-nav a{
  margin-left:32px;
  font-family:'Oswald', sans-serif;
  font-size:13px;
  letter-spacing:0.1em;
}

/* ====== Hero ====== */
.hero{
  padding:96px 48px;
  max-width:960px;
}
.hero h1{
  font-size:40px;
  font-weight:700;
  margin:16px 0;
  letter-spacing:0.04em;
}
.hero p{
  font-size:16px;
  color:var(--ink-soft);
  max-width:560px;
}

/* ====== 三層產品結構卡片 ====== */
.tier-grid{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  border-top:1px solid var(--ink);
  border-bottom:1px solid var(--ink);
}
.tier{
  padding:40px 32px;
  border-right:1px solid var(--line);
}
.tier:last-child{border-right:none;}
.tier h3{font-size:18px;margin-bottom:8px;}
.tier p{font-size:14px;color:var(--ink-soft);}

/* ====== 頁尾 ====== */
.site-footer{
  padding:32px 48px;
  border-top:1px solid var(--ink);
  display:flex;
  justify-content:space-between;
  font-family:'Oswald', sans-serif;
  font-size:12px;
  letter-spacing:0.1em;
  color:var(--ink-soft);
}

@media(max-width:720px){
  .site-header{flex-direction:column;align-items:flex-start;gap:12px;}
  .site-nav a{margin-left:0;margin-right:24px;}
  .tier-grid{grid-template-columns:1fr;}
  .tier{border-right:none;border-bottom:1px solid var(--line);}
}