@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Orbitron:wght@700;900&display=swap');

:root{
  --ink:#172623;
  --ink-2:#101b19;
  --teal:#5cc6b0;
  --sand:#d4c4a8;
  --clay:#b06a4c;
  --olive:#6b7b3c;
  --line:rgba(212,196,168,.18);
  --r:4px;
  --maxw:1160px;
  --pad:clamp(16px,4vw,40px);
}

*{box-sizing:border-box}

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

body{
  margin:0;
  background:var(--ink);
  color:#e4dbcb;
  font-family:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,'PingFang SC','Microsoft YaHei',sans-serif;
  font-size:17px;
  line-height:1.68;
  overflow-x:clip;
  -webkit-font-smoothing:antialiased;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.5;
  background-image:radial-gradient(rgba(255,255,255,.06) 1px, transparent 1px);
  background-size:3px 3px;
}

img{max-width:100%}

/* ---------- 顶栏 ---------- */
.bar{
  position:sticky;
  top:0;
  z-index:40;
  display:flex;
  align-items:center;
  gap:8px;
  padding:8px var(--pad);
  background:rgba(16,27,25,.94);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(8px);
}

.brand{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  justify-content:center;
  min-width:44px;
  min-height:44px;
  border-radius:var(--r);
  background:rgba(92,198,176,.12);
  text-decoration:none;
}

.mark-img{
  width:26px;
  height:26px;
  display:block;
  border-radius:2px;
}

.mark-txt{
  display:flex;
  align-items:center;
  justify-content:center;
  width:26px;
  height:26px;
  font-family:'Orbitron',sans-serif;
  font-weight:900;
  font-size:16px;
  color:var(--teal);
}

.jump{
  flex:1 1 auto;
  min-width:0;
  overflow-x:auto;
  scrollbar-width:none;
  -webkit-overflow-scrolling:touch;
}

.jump::-webkit-scrollbar{display:none}

.jump ul{
  display:flex;
  align-items:center;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}

.jump li{flex:0 0 auto}

.jump a{
  display:flex;
  align-items:center;
  gap:7px;
  min-height:44px;
  padding:0 12px;
  border-radius:var(--r);
  color:var(--sand);
  text-decoration:none;
  font-size:16px;
  white-space:nowrap;
}

.jump a:hover,
.jump a:focus-visible{
  background:rgba(212,196,168,.11);
  color:#fff;
}

.tick{
  width:6px;
  height:6px;
  flex:0 0 auto;
  border-radius:1px;
  background:var(--olive);
}

.jump a:hover .tick,
.jump a:focus-visible .tick{background:var(--teal)}

.cta{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 18px;
  border-radius:var(--r);
  background:var(--teal);
  color:var(--ink);
  font-weight:700;
  font-size:16px;
  text-decoration:none;
}

.cta:hover{background:#7ad6c2}

/* ---------- 主区 ---------- */
main{position:relative;z-index:1}

.hero{
  position:relative;
  overflow:hidden;
  max-width:var(--maxw);
  margin:0 auto;
  padding:34px var(--pad) 38px;
  display:grid;
  grid-template-columns:1.05fr .95fr;
  gap:clamp(20px,4vw,48px);
  align-items:center;
  min-height:45vh;
  border-bottom:1px solid var(--line);
}

.hero-num{
  position:absolute;
  right:6%;
  top:-10%;
  z-index:0;
  font-family:'Orbitron',sans-serif;
  font-weight:900;
  font-size:clamp(120px,22vw,250px);
  line-height:1;
  color:rgba(92,198,176,.1);
  pointer-events:none;
  user-select:none;
  will-change:transform;
}

.hero-copy{
  position:relative;
  z-index:1;
}

.eyebrow{
  display:inline-block;
  margin-bottom:10px;
  font-size:16px;
  letter-spacing:.26em;
  color:var(--teal);
}

.hero h1{
  margin:0 0 14px;
  font-family:'Orbitron','PingFang SC',sans-serif;
  font-weight:900;
  font-size:clamp(28px,4.6vw,44px);
  line-height:1.26;
  color:#fff;
  letter-spacing:.01em;
}

.lede{
  margin:0;
  max-width:34em;
  color:var(--sand);
  font-size:16px;
}

.hero-art{
  position:relative;
  z-index:1;
  margin:0;
}

.hero-art img{
  display:block;
  width:100%;
  height:auto;
  border-radius:var(--r);
  box-shadow:0 18px 40px -24px rgba(0,0,0,.9);
}

.hero-blank{
  display:block;
  aspect-ratio:4/3;
  border-radius:var(--r);
  background:linear-gradient(150deg,#2c4038,#1d2f2a 58%,#243430);
}

.stage{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--pad) 60px;
  display:grid;
  grid-template-columns:minmax(0,1fr) 272px;
  gap:clamp(20px,4vw,48px);
  align-items:start;
}

/* ---------- 正文 ---------- */
.prose{
  min-width:0;
  padding-top:8px;
}

.prose section{
  scroll-margin-top:110px;
  padding:34px 0;
  border-top:1px solid var(--line);
}

.prose section:first-child{border-top:0;padding-top:6px}

.prose small{
  display:block;
  margin-bottom:8px;
  font-size:16px;
  letter-spacing:.22em;
  color:var(--clay);
}

.prose h2{
  margin:0 0 14px;
  font-family:'Orbitron','PingFang SC',sans-serif;
  font-weight:700;
  font-size:clamp(21px,2.8vw,27px);
  line-height:1.36;
  color:#fff;
}

.prose h3{
  margin:24px 0 10px;
  font-size:19px;
  line-height:1.45;
  color:var(--sand);
}

.prose p{margin:0 0 14px;color:#ded5c5}

.prose ul,
.prose ol{
  margin:0 0 16px;
  padding-left:1.35em;
  color:#ded5c5;
}

.prose li{margin-bottom:6px}

.prose a{
  color:var(--teal);
  text-underline-offset:3px;
}

.prose figure{
  margin:18px 0;
  padding:0;
}

.prose img{
  display:block;
  width:100%;
  height:auto;
  border-radius:var(--r);
}

.prose blockquote{
  margin:18px 0;
  padding:14px 18px;
  border-left:3px solid var(--clay);
  border-radius:0 var(--r) var(--r) 0;
  background:rgba(212,196,168,.07);
  color:var(--sand);
}

.prose table{
  width:100%;
  border-collapse:collapse;
  font-size:16px;
}

.prose th,
.prose td{
  padding:9px 10px;
  border-bottom:1px solid var(--line);
  text-align:left;
  vertical-align:top;
}

.prose code{
  padding:1px 5px;
  border-radius:2px;
  background:rgba(92,198,176,.13);
  color:#cfeee5;
  font-size:16px;
}

/* ---------- 右侧栏 ---------- */
.rail{
  position:sticky;
  top:110px;
  margin-top:36px;
  padding:16px 16px 12px;
  border-radius:var(--r);
  background:rgba(212,196,168,.07);
}

.rail small{
  display:block;
  margin-bottom:6px;
  font-size:16px;
  letter-spacing:.22em;
  color:var(--clay);
}

.rail h2{
  margin:0 0 12px;
  font-family:'Orbitron','PingFang SC',sans-serif;
  font-size:18px;
  color:#fff;
}

.rail-list{
  margin:0;
  padding:0;
  list-style:none;
  counter-reset:rail;
}

.rail-list li{
  counter-increment:rail;
  border-top:1px dashed var(--line);
}

.rail-list li:first-child{border-top:0}

.rail-list a{
  display:flex;
  align-items:center;
  gap:9px;
  min-height:40px;
  color:var(--sand);
  text-decoration:none;
  font-size:16px;
  line-height:1.4;
}

.rail-list a::before{
  content:counter(rail,decimal-leading-zero);
  flex:0 0 auto;
  font-family:'Orbitron',sans-serif;
  font-size:16px;
  color:var(--teal);
}

.rail-list a:hover{color:#fff}

/* ---------- 页脚 ---------- */
footer{
  position:relative;
  z-index:1;
  padding:36px var(--pad) 22px;
  background:var(--ink-2);
  border-top:1px solid var(--line);
}

.foot-cta{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  max-width:var(--maxw);
  margin:0 auto 30px;
  padding:22px 24px;
  min-height:68px;
  border-radius:var(--r);
  background:linear-gradient(118deg,rgba(92,198,176,.18),rgba(176,106,76,.18));
  color:#fff;
  text-decoration:none;
}

.foot-cta strong{
  font-family:'Orbitron','PingFang SC',sans-serif;
  font-weight:900;
  font-size:clamp(20px,3.6vw,30px);
  line-height:1.3;
}

.foot-cta span{
  flex:0 0 auto;
  color:var(--sand);
  font-size:16px;
  white-space:nowrap;
}

.foot-cta:hover{background:linear-gradient(118deg,rgba(92,198,176,.3),rgba(176,106,76,.26))}

.foot-cols{
  max-width:var(--maxw);
  margin:0 auto;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:26px;
  align-items:start;
}

footer address{
  display:flex;
  align-items:center;
  gap:10px;
  font-style:normal;
  font-size:16px;
  color:var(--sand);
}

footer address .mark-img,
footer address .mark-txt{
  width:28px;
  height:28px;
  flex:0 0 auto;
}

.foot-links{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}

.foot-links a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:0 6px;
  border-radius:var(--r);
  color:var(--sand);
  text-decoration:none;
  font-size:16px;
}

.foot-links a:hover{
  color:var(--teal);
  background:rgba(212,196,168,.08);
}

.copy{
  max-width:var(--maxw);
  margin:28px auto 0;
  padding-top:16px;
  border-top:1px solid var(--line);
  text-align:center;
  font-size:16px;
  color:rgba(212,196,168,.72);
}

/* ---------- 动效 ---------- */
.reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .65s ease-out,transform .65s ease-out;
}

.reveal.in{
  opacity:1;
  transform:none;
}

/* ---------- 断点 ---------- */
@media (max-width:880px){
  .hero{
    grid-template-columns:1fr;
    min-height:0;
    padding-top:26px;
  }
  .hero-art{order:2}
  .hero-num{
    top:-4%;
    right:2%;
    font-size:clamp(96px,30vw,150px);
  }
  .stage{grid-template-columns:1fr}
  .rail{
    position:static;
    margin-top:4px;
    order:2;
  }
  .foot-cols{grid-template-columns:1fr}
}

@media (max-width:560px){
  body{font-size:16px}
  .jump a{padding:0 10px}
  .cta{padding:0 14px}
  .foot-links{grid-template-columns:1fr}
  .foot-cta{padding:18px}
  .foot-cta span{display:none}
  .copy{font-size:16px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .hero-num{transform:none!important}
}

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