@import url('https://fonts.googleapis.com/css2?family=Calistoga:ital@0;1&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  --cream:#f5e6c8;
  --caramel:#d4a574;
  --ink:#262117;
  --paper:#f8eeda;
  --ink-soft:#5c5140;
  --line:rgba(38,33,23,.2);
  --serif:'Calistoga', Georgia, 'Songti SC', 'Noto Serif SC', serif;
  --sans:'Inter', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

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

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.72;
  font-weight:400;
  overflow-x:hidden;
}

body::after{
  content:'';
  position:fixed;
  inset:0;
  z-index:70;
  pointer-events:none;
  opacity:.26;
  mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
  background-size:160px 160px;
}

a{ color:inherit; }

a:focus-visible{
  outline:3px solid var(--caramel);
  outline-offset:2px;
}

section[id]{ scroll-margin-top:6.2rem; }

/* ---------- 顶栏 ---------- */
.dock{
  position:sticky;
  top:0;
  z-index:50;
  display:flex;
  align-items:center;
  gap:.7rem;
  padding:.62rem clamp(.8rem, 3vw, 1.8rem);
  background:rgba(245,230,200,.95);
  border-bottom:2px solid var(--ink);
  box-shadow:0 6px 0 -4px var(--caramel);
}

.mark{
  flex:0 0 auto;
  width:42px;
  height:42px;
  display:grid;
  place-items:center;
  background:var(--ink);
  color:var(--cream);
  border:2px solid var(--ink);
  text-decoration:none;
  overflow:hidden;
}

.mark-img{ width:100%; height:100%; object-fit:cover; display:block; }

.mark-txt{
  font-family:var(--serif);
  font-size:1.25rem;
  line-height:1;
}

.nav{
  flex:1 1 auto;
  min-width:0;
  overflow-x:auto;
  scrollbar-width:none;
}

.nav::-webkit-scrollbar{ height:0; }

.nav-list{
  display:flex;
  align-items:center;
  gap:.38rem;
  margin:0;
  padding:.15rem .1rem;
  list-style:none;
}

.nav-list a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:.5rem .82rem;
  font-size:.95rem;
  font-weight:500;
  letter-spacing:.01em;
  white-space:nowrap;
  text-decoration:none;
  color:var(--ink);
  border:1.5px solid var(--ink);
  border-radius:999px;
  transition:background .18s ease, color .18s ease;
}

.nav-list a:hover,
.nav-list a:focus-visible{
  background:var(--ink);
  color:var(--cream);
}

.nav-list a.is-active{
  background:var(--caramel);
  border-color:var(--caramel);
  color:var(--ink);
}

.cta{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:.5rem 1.05rem;
  font-size:.95rem;
  font-weight:600;
  text-decoration:none;
  color:var(--cream);
  background:var(--ink);
  border-radius:999px;
  transition:background .18s ease;
}

.cta:hover,
.cta:focus-visible{ background:var(--caramel); color:var(--ink); }

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  display:grid;
  grid-template-columns:1fr;
  min-height:70vh;
  padding:5.4rem clamp(1.1rem, 4vw, 3rem) 7rem;
  background:var(--ink);
  color:var(--cream);
  clip-path:polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 3.4rem));
  overflow:hidden;
}

.hero::before{
  content:'';
  position:absolute;
  inset:0 0 auto 0;
  height:9px;
  background:repeating-linear-gradient(90deg, var(--caramel) 0 15px, transparent 15px 26px);
}

.hero::after{
  content:'';
  position:absolute;
  top:-14%;
  right:-12%;
  width:58%;
  height:74%;
  pointer-events:none;
  mix-blend-mode:screen;
  background:radial-gradient(circle at 68% 32%, rgba(212,165,116,.5), transparent 64%);
}

.hero-plate{
  position:relative;
  margin:0;
  min-height:26vh;
  max-height:44vh;
  overflow:hidden;
  background:repeating-linear-gradient(135deg, rgba(212,165,116,.4) 0 11px, rgba(38,33,23,.65) 11px 22px);
}

.hero-img{
  display:block;
  width:100%;
  height:118%;
  object-fit:cover;
  filter:sepia(.34) saturate(.82) contrast(1.06);
}

.hero-copy{
  position:relative;
  z-index:2;
  padding-top:1.3rem;
  text-align:right;
}

.hero-copy h1{
  margin:0;
  font-family:var(--serif);
  font-weight:400;
  font-size:clamp(2rem, 7.2vw, 4.2rem);
  line-height:1.06;
  letter-spacing:.005em;
  color:var(--cream);
}

/* ---------- 主体 ---------- */
.split{
  display:grid;
  grid-template-columns:1fr;
  gap:2.2rem;
  max-width:1180px;
  margin:0 auto;
  padding:3.4rem clamp(1.1rem, 4vw, 3rem) 4.2rem;
}

.prose{ min-width:0; }

.prose > section{
  padding-bottom:2.6rem;
  margin-bottom:2.6rem;
  border-bottom:2px solid var(--line);
}

.prose > section:last-child{
  padding-bottom:0;
  margin-bottom:0;
  border-bottom:0;
}

.prose h2{
  margin:0 0 .75rem;
  padding-left:.72rem;
  border-left:5px solid var(--caramel);
  font-family:var(--serif);
  font-weight:400;
  font-size:clamp(1.45rem, 3.6vw, 2.05rem);
  line-height:1.22;
}

.prose h3{
  margin:1.9rem 0 .55rem;
  font-family:var(--sans);
  font-size:1.15rem;
  font-weight:700;
  line-height:1.35;
}

.prose p{ margin:0 0 1.05rem; }

.prose p.subtitle,
.prose .subtitle{
  color:var(--ink-soft);
  font-size:.98rem;
  line-height:1.6;
}

.prose a{
  color:var(--ink);
  text-decoration:underline;
  text-decoration-color:var(--caramel);
  text-decoration-thickness:2px;
  text-underline-offset:3px;
}

.prose a:hover{ background:rgba(212,165,116,.4); }

.prose ul,
.prose ol{
  margin:0 0 1.1rem;
  padding-left:1.25rem;
}

.prose li{ margin-bottom:.45rem; }

.prose strong{ font-weight:700; }

.prose figure{ margin:1.5rem 0; }

.prose figure img{ width:100%; height:auto; display:block; }

.prose img{ max-width:100%; height:auto; }

.prose blockquote{
  margin:1.5rem 0;
  padding:1rem 1.2rem;
  border-left:5px solid var(--ink);
  background:rgba(212,165,116,.24);
  font-size:.98rem;
}

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

.prose hr{
  border:0;
  border-top:2px dashed var(--line);
  margin:2rem 0;
}

.prose table{
  width:100%;
  border-collapse:collapse;
  font-size:.95rem;
}

.prose th,
.prose td{
  border-bottom:1px solid var(--line);
  padding:.55rem .5rem;
  text-align:left;
}

/* ---------- 右侧栏 ---------- */
.rail{ min-width:0; }

.rail h2{
  margin:0 0 .55rem;
  padding-bottom:.6rem;
  border-bottom:3px solid var(--ink);
  font-family:var(--serif);
  font-weight:400;
  font-size:1.3rem;
  line-height:1.25;
}

.rail .subtitle{
  margin:0;
  color:var(--ink-soft);
  font-size:.95rem;
  line-height:1.6;
}

.rail-list{
  margin:1.15rem 0 0;
  padding:0;
  list-style:none;
  border-top:1px solid var(--line);
}

.rail-list li{ margin:0; }

.rail-list a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:.45rem .1rem;
  font-size:.95rem;
  text-decoration:none;
  color:var(--ink);
  border-bottom:1px dashed var(--line);
}

.rail-list a::before{
  content:'';
  width:9px;
  height:9px;
  margin-right:.6rem;
  flex:0 0 auto;
  background:var(--caramel);
}

.rail-list a:hover{ background:rgba(212,165,116,.3); }

/* ---------- 页脚 ---------- */
footer{
  background:var(--ink);
  color:var(--cream);
  padding:3.4rem clamp(1.1rem, 4vw, 3rem) 2.2rem;
}

footer p{ margin:0 0 1.1rem; }

.foot-big a{
  display:inline-block;
  font-family:var(--serif);
  font-weight:400;
  font-size:clamp(1.7rem, 6.5vw, 3rem);
  line-height:1.12;
  color:var(--cream);
  text-decoration:none;
  border-bottom:3px solid var(--caramel);
}

.foot-links{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.25rem .65rem;
  font-size:.95rem;
}

.foot-links a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  color:var(--caramel);
  text-decoration:none;
}

.foot-links a:hover{ text-decoration:underline; }

.foot-links span{ color:rgba(245,230,200,.45); }

footer small{
  display:block;
  margin-top:1.2rem;
  padding-top:1.2rem;
  border-top:1px solid rgba(245,230,200,.22);
  font-size:.95rem;
  color:rgba(245,230,200,.72);
}

/* ---------- 动效 ---------- */
.prose > div.stagger{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .55s ease, transform .55s ease;
}

.prose > div.stagger.in{
  opacity:1;
  transform:none;
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  .prose > div.stagger{
    opacity:1;
    transform:none;
    transition:none;
  }
}

/* ---------- 断点 ---------- */
@media (max-width:640px){
  .dock{ flex-wrap:wrap; }
  .nav{ order:3; flex-basis:100%; }
  .cta{ margin-left:auto; }
  .hero{ min-height:0; padding-top:4.6rem; }
  .hero-plate{ min-height:30vh; max-height:52vh; }
}

@media (min-width:900px){
  .hero{
    grid-template-columns:1.05fr .95fr;
    gap:2.6rem;
    align-items:end;
    padding-left:0;
    padding-bottom:8.2rem;
  }
  .hero-plate{
    align-self:stretch;
    max-height:none;
    min-height:0;
  }
  .hero-copy{ padding-bottom:.6rem; }
}

@media (min-width:1000px){
  .split{
    grid-template-columns:minmax(0,1fr) 276px;
    gap:3.4rem;
  }
  .rail{
    position:sticky;
    top:5.8rem;
    align-self:start;
  }
}

button[aria-expanded]{min-width:44px;min-height:44px}