@import url('https://fonts.googleapis.com/css2?family=Nunito+Sans:wght@300;400;500;600;700&family=Rubik:wght@300;400;500;600;700&display=swap');

:root{
  --ink:#172623;
  --deep:#101b19;
  --mint:#5cc6b0;
  --sand:#d4c4a8;
  --paper:#f4eee4;
  --clay:#c67b5c;
  --olive:#6b7b3c;
  --line:#ddd2c0;
  --text:#22322e;
}

*{box-sizing:border-box}

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

body{
  margin:0;
  font-family:Rubik,"Nunito Sans",system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.72;
  color:var(--text);
  background:var(--paper);
  background-image:
    repeating-linear-gradient(90deg,rgba(212,196,168,.30) 0 1px,transparent 1px 7px),
    linear-gradient(180deg,#f7f1e8,#f1e9dd 55%,#efe6d8);
  -webkit-font-smoothing:antialiased;
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:8;
  pointer-events:none;
  opacity:.45;
  background-image:radial-gradient(rgba(23,38,35,.20) 1px,transparent 1px);
  background-size:4px 4px;
}

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

a{color:var(--ink)}

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

.skip{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:60;
  background:var(--mint);
  color:var(--deep);
  padding:12px 18px;
  text-decoration:none;
  font-weight:600;
}
.skip:focus{left:0}

/* 顶栏 */
.bar{
  position:sticky;
  top:0;
  z-index:20;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:9px 18px;
  background:var(--deep);
  background-image:repeating-linear-gradient(90deg,rgba(92,198,176,.13) 0 1px,transparent 1px 9px);
  border-bottom:3px solid var(--mint);
}

.brand{
  display:flex;
  align-items:center;
  gap:9px;
  min-height:46px;
  padding:6px 2px;
  color:#f2f8f4;
  font-weight:600;
  font-size:1.06rem;
  letter-spacing:.05em;
  text-decoration:none;
}
.brand .logo{width:30px;height:30px;object-fit:contain}

.burger{
  min-width:64px;
  min-height:44px;
  padding:10px 14px;
  font:inherit;
  font-size:.95rem;
  letter-spacing:.14em;
  color:#eaf4ee;
  background:transparent;
  border:2px solid rgba(212,196,168,.6);
  border-radius:0;
  cursor:pointer;
  transition:background .25s ease-out,color .25s ease-out,border-color .25s ease-out;
}
.burger:hover,.burger:focus-visible{
  background:var(--mint);
  border-color:var(--mint);
  color:var(--deep);
}
body.menu-open .bar{z-index:40}

/* 全屏菜单 */
.veil{
  position:fixed;
  inset:0;
  z-index:30;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:76px 18px 32px;
  overflow-y:auto;
  background:rgba(16,27,25,.97);
  background-image:
    repeating-linear-gradient(45deg,rgba(212,196,168,.10) 0 2px,transparent 2px 7px),
    radial-gradient(circle at 82% 12%,rgba(92,198,176,.28),transparent 60%);
  opacity:0;
  visibility:hidden;
  transition:opacity .34s ease-out,visibility .34s ease-out;
}
body.menu-open .veil{opacity:1;visibility:visible}

.veil-nav ol{
  counter-reset:mv;
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:2px;
}
.veil-nav li{counter-increment:mv}
.veil-nav a{
  display:block;
  min-height:52px;
  padding:13px 16px 13px 46px;
  position:relative;
  color:#eef6f1;
  font-size:1.2rem;
  letter-spacing:.03em;
  text-decoration:none;
  border-left:3px solid transparent;
  transition:background .25s ease-out,border-color .25s ease-out,color .25s ease-out,padding-left .25s ease-out;
}
.veil-nav a::before{
  content:counter(mv,decimal-leading-zero);
  position:absolute;
  left:16px;
  top:50%;
  transform:translateY(-50%);
  font-size:.8rem;
  letter-spacing:.1em;
  color:var(--sand);
}
.veil-nav a:hover,.veil-nav a:focus-visible{
  background:rgba(92,198,176,.16);
  border-left-color:var(--mint);
  color:#fff;
  padding-left:52px;
}

/* 主视觉 */
.hero{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  align-items:stretch;
  min-height:45vh;
  background:var(--ink);
  color:#f0f6f1;
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(240,246,241,.055) 0 1px,transparent 1px 6px);
}

.hero-art{
  position:relative;
  margin:0;
  min-height:200px;
  background:linear-gradient(150deg,#213a33,#172623 62%,#25413a);
}
.hero-art img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
}

.hero-copy{
  position:relative;
  z-index:2;
  align-self:center;
  padding:38px 30px;
  text-align:right;
}
.hero-copy h1{
  margin:0;
  font-size:clamp(1.55rem,4.4vw,2.6rem);
  line-height:1.28;
  letter-spacing:.01em;
  font-weight:600;
  text-shadow:0 1px 0 rgba(0,0,0,.25);
}

.tag{
  position:absolute;
  top:14px;
  left:14px;
  z-index:3;
  margin:0;
  padding:6px 12px;
  font-size:.85rem;
  font-weight:600;
  letter-spacing:.12em;
  color:var(--deep);
  background:var(--mint);
}

/* 主体 */
.shell{
  max-width:1140px;
  margin:0 auto;
  padding:32px 20px 54px;
  display:grid;
  grid-template-columns:238px minmax(0,1fr);
  gap:34px;
  align-items:start;
}

.rail{
  position:sticky;
  top:84px;
  padding:18px 16px 22px;
  background:var(--sand);
  background-image:repeating-linear-gradient(45deg,rgba(255,255,255,.42) 0 2px,transparent 2px 6px);
  border-top:6px solid var(--mint);
}
.rail h2{
  margin:0;
  font-size:.86rem;
  font-weight:600;
  letter-spacing:.24em;
  color:#3d4a3c;
}
.rail hr{
  width:46px;
  margin:9px 0 12px;
  border:0;
  border-top:2px solid var(--clay);
}
.rail ul{
  list-style:none;
  margin:0;
  padding:0;
}
.rail a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:8px 4px;
  font-size:.97rem;
  color:#22322e;
  text-decoration:none;
  border-bottom:1px solid rgba(23,38,35,.14);
  transition:padding-left .22s ease-out,color .22s ease-out,background .22s ease-out;
}
.rail a:hover,.rail a:focus-visible{
  padding-left:10px;
  color:var(--deep);
  background:rgba(92,198,176,.34);
}

section[id]{scroll-margin-top:96px}

.prose{
  font-size:1.06rem;
  line-height:1.78;
  min-width:0;
}
.prose > *{max-width:64ch}
.prose p{margin:0 0 1.15em}
.prose h2{
  margin:2.3rem 0 .7rem;
  font-size:1.42rem;
  line-height:1.35;
  letter-spacing:.01em;
  color:var(--ink);
}
.prose h3{
  margin:1.8rem 0 .6rem;
  font-size:1.14rem;
  line-height:1.4;
  color:#2b3f39;
}
.prose hr{
  width:68px;
  margin:0 0 1.2rem;
  border:0;
  border-top:2px solid var(--mint);
}
.prose ul,.prose ol{padding-left:1.35em;margin:0 0 1.2em}
.prose li{margin:.35em 0}
.prose a{
  color:#1d5f52;
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:2px;
  text-decoration-color:rgba(92,198,176,.75);
  transition:background .2s ease-out;
}
.prose a:hover,.prose a:focus-visible{background:rgba(92,198,176,.34)}
.prose strong{color:var(--ink)}
.prose blockquote{
  margin:1.4em 0;
  padding:14px 18px;
  background:var(--sand);
  border-left:5px solid var(--olive);
  font-style:normal;
}
.prose blockquote p:last-child{margin-bottom:0}
.prose figure{margin:1.5em 0}
.prose figcaption{
  padding-top:8px;
  font-size:.9rem;
  color:#4d5c54;
}
.prose img{width:100%}
.prose table{
  width:100%;
  border-collapse:collapse;
  font-size:.98rem;
  background:#fbf7f0;
}
.prose th,.prose td{
  padding:10px 12px;
  text-align:left;
  border-bottom:1px solid var(--line);
}
.prose th{background:var(--sand);color:var(--ink)}
.prose code{
  padding:2px 5px;
  font-size:.92em;
  background:#e7ddcb;
}

/* 页脚 */
.foot{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:4px 20px;
  padding:14px 20px;
  background:var(--deep);
  background-image:repeating-linear-gradient(90deg,rgba(212,196,168,.10) 0 1px,transparent 1px 8px);
  border-top:3px solid var(--mint);
  color:#c9d8d0;
  text-align:center;
}
.f-brand a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:6px 4px;
  font-weight:600;
  letter-spacing:.06em;
  color:#f2f8f4;
  text-decoration:none;
}
.f-nav dl{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:0 2px;
  margin:0;
}
.f-nav dt{margin:0}
.f-nav a{
  display:block;
  min-height:42px;
  padding:11px 8px;
  font-size:.9rem;
  color:#c9d8d0;
  text-decoration:none;
  transition:color .2s ease-out,background .2s ease-out;
}
.f-nav a:hover,.f-nav a:focus-visible{
  color:var(--deep);
  background:var(--mint);
}
.f-copy p{
  margin:0;
  padding:10px 4px;
  font-size:.88rem;
  letter-spacing:.05em;
}

/* 动效 */
.motion .rv{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .55s ease-out,transform .55s ease-out;
}
.motion .rv.in{
  opacity:1;
  transform:none;
}

/* 窄屏 */
@media (max-width:860px){
  .shell{
    grid-template-columns:minmax(0,1fr);
    gap:24px;
    padding:22px 18px 44px;
  }
  .rail{position:static;top:auto}
  .rail ul{
    display:flex;
    flex-wrap:wrap;
    gap:0 8px;
  }
  .rail a{
    min-height:40px;
    border-bottom:0;
    padding:6px 2px;
    font-size:.94rem;
  }
  .rail a:hover,.rail a:focus-visible{padding-left:2px;background:transparent;text-decoration:underline}
  .hero{
    grid-template-columns:minmax(0,1fr);
    min-height:0;
  }
  .hero-art{min-height:186px;height:186px}
  .hero-copy{
    padding:26px 18px 24px;
    text-align:left;
  }
  .tag{top:10px;left:10px}
  .veil-nav a{font-size:1.08rem;padding:12px 14px 12px 42px}
  .veil-nav a::before{left:14px}
  .veil-nav a:hover,.veil-nav a:focus-visible{padding-left:46px}
  .prose{font-size:1.02rem}
  .foot{gap:2px 10px;padding:12px 14px}
  .f-nav a{font-size:.86rem;padding:10px 6px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .motion .rv{
    opacity:1;
    transform:none;
    transition:none;
  }
  .burger,.veil,.veil-nav a,.rail a,.f-nav a,.prose a{transition:none}
}

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