@import url('https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:wght@400;700&display=swap');

:root{
  --ink:#192617;
  --ink-deep:#0a120b;
  --ink-soft:#142013;
  --neon:#87ff71;
  --cyan:#01cdfe;
  --bloom:#ff9be0;
  --paper:#eaf7e6;
  --dim:#a8c6a1;
  --glass:rgba(18,32,15,.6);
  --line:rgba(135,255,113,.2);
  --r:28px;
  --tap:44px;
}

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

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

body{
  margin:0;
  font-size:17px;
  line-height:1.75;
  color:var(--paper);
  font-family:'Atkinson Hyperlegible',system-ui,-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  background:
    radial-gradient(760px 420px at 78% -8%,rgba(1,205,254,.25),transparent 68%),
    radial-gradient(620px 380px at 10% 3%,rgba(135,255,113,.16),transparent 70%),
    linear-gradient(180deg,var(--ink-deep) 0%,var(--ink-soft) 46%,var(--ink-deep) 100%);
  background-attachment:fixed;
  overflow-x:hidden;
}

body::after{
  content:'';
  position:fixed;
  inset:0;
  z-index:80;
  pointer-events:none;
  background:repeating-linear-gradient(180deg,rgba(0,0,0,.24) 0 1px,transparent 1px 3px);
  opacity:.45;
}

/* ---------- 顶部两行 ---------- */
.topbar{
  position:sticky;
  top:0;
  z-index:90;
  background:rgba(10,18,11,.86);
  backdrop-filter:blur(14px) saturate(150%);
  -webkit-backdrop-filter:blur(14px) saturate(150%);
  border-bottom:1px solid var(--line);
}

.ticker{
  margin:0;
  padding:6px 18px;
  font-size:16px;
  font-weight:700;
  letter-spacing:.16em;
  text-align:center;
  color:#0b1509;
  background:linear-gradient(90deg,var(--neon),var(--cyan) 62%,var(--bloom));
}

.bar{
  max-width:1180px;
  margin:0 auto;
  padding:8px 18px 12px;
}

.bar-brand{display:flex;align-items:center;padding:2px 0 10px}

.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  min-height:var(--tap);
  padding:6px 12px 6px 8px;
  border-radius:16px;
  text-decoration:none;
  color:var(--paper);
  font-size:20px;
  font-weight:700;
  letter-spacing:.04em;
}
.brand:hover,.brand:focus-visible{background:rgba(135,255,113,.12)}

.mark{
  display:grid;
  place-items:center;
  flex:none;
  width:34px;
  height:34px;
  border-radius:12px;
  font-size:17px;
  color:#0b1509;
  background:linear-gradient(135deg,var(--neon),var(--cyan));
  box-shadow:0 0 18px rgba(1,205,254,.55);
}

.menu ul{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin:0;
  padding:0;
  list-style:none;
}

.menu a{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:var(--tap);
  padding:8px 13px;
  border:1px solid transparent;
  border-radius:14px;
  font-size:16px;
  color:#d6ecd0;
  text-decoration:none;
}
.menu a:hover,.menu a:focus-visible{
  color:#0b1509;
  background:linear-gradient(135deg,var(--neon),var(--cyan));
}

.ico{
  flex:none;
  width:8px;
  height:8px;
  border-radius:2px;
  background:var(--neon);
  box-shadow:0 0 9px var(--neon);
}
.menu a:hover .ico{background:#0b1509;box-shadow:none}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  display:flex;
  flex-direction:column;
  gap:18px;
  min-height:45vh;
  padding:26px 20px 0;
}

.hero::before{
  content:'';
  position:absolute;
  inset:0;
  z-index:-2;
  background:
    radial-gradient(560px 240px at 20% 10%,rgba(1,205,254,.22),transparent 70%),
    linear-gradient(180deg,rgba(255,155,224,.12),transparent 58%);
}

.hero::after{
  content:'';
  position:absolute;
  left:-22%;
  right:-22%;
  bottom:0;
  height:56%;
  z-index:-1;
  background-image:
    linear-gradient(rgba(1,205,254,.42) 1px,transparent 1px),
    linear-gradient(90deg,rgba(1,205,254,.3) 1px,transparent 1px);
  background-size:52px 26px;
  transform:perspective(320px) rotateX(64deg);
  transform-origin:bottom center;
  opacity:.6;
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 58%);
  mask-image:linear-gradient(180deg,transparent,#000 58%);
}

.hero-copy{max-width:1180px;margin:0 auto;width:100%}

.hero h1{
  margin:0;
  font-size:clamp(2rem,8vw,3.4rem);
  line-height:1.15;
  letter-spacing:.02em;
  background:linear-gradient(120deg,var(--neon),var(--cyan) 60%,var(--bloom));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 18px rgba(1,205,254,.45));
}

.hero-art{
  margin-top:auto;
  max-width:1180px;
  width:100%;
  margin-left:auto;
  margin-right:auto;
  overflow:hidden;
  border-radius:var(--r) var(--r) 0 0;
}

.hero-img{
  display:block;
  width:100%;
  height:auto;
  max-height:40vh;
  object-fit:cover;
  border:1px solid rgba(1,205,254,.32);
  border-bottom:0;
  border-radius:var(--r) var(--r) 0 0;
  box-shadow:0 -18px 54px rgba(1,205,254,.22);
  transform:scale(1.06);
  transform-origin:center top;
  will-change:transform;
}

/* ---------- 主体骨架 ---------- */
.wrap{
  display:grid;
  grid-template-columns:minmax(0,1fr) 292px;
  gap:26px;
  align-items:start;
  max-width:1160px;
  margin:0 auto;
  padding:30px 18px 46px;
}

.content{min-width:0}

.prose article,.prose{min-width:0}

.prose > div{
  margin:0 0 24px;
  padding:24px 22px;
  border:1px solid var(--line);
  border-radius:var(--r);
  background:var(--glass);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  box-shadow:0 18px 44px rgba(0,0,0,.3);
  scroll-margin-top:172px;
}
.prose > div:last-child{margin-bottom:0}

.prose h2{
  margin:0 0 10px;
  font-size:clamp(1.35rem,3.6vw,1.7rem);
  line-height:1.35;
  color:var(--neon);
  text-shadow:0 0 18px rgba(135,255,113,.32);
}

.prose h3{
  margin:20px 0 8px;
  font-size:1.15rem;
  line-height:1.4;
  color:var(--cyan);
}

.prose p{margin:0 0 14px}
.prose p:last-child{margin-bottom:0}

.prose a{
  color:var(--cyan);
  text-decoration:underline;
  text-underline-offset:3px;
}
.prose a:hover{color:var(--neon)}

.prose ul,.prose ol{margin:0 0 14px;padding-left:1.25em}
.prose li{margin:0 0 8px}
.prose strong{color:#fff}
.prose img{max-width:100%;height:auto;border-radius:18px}
.prose blockquote{
  margin:0 0 14px;
  padding:12px 16px;
  border-left:3px solid var(--cyan);
  background:rgba(1,205,254,.08);
  border-radius:0 18px 18px 0;
}
.prose code{
  padding:2px 6px;
  border-radius:8px;
  background:rgba(1,205,254,.14);
  font-size:16px;
}

/* ---------- 右侧栏 ---------- */
.rail{
  position:sticky;
  top:176px;
  padding:20px 18px;
  border:1px solid var(--line);
  border-radius:var(--r);
  background:var(--glass);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}

.rail h2{
  margin:0 0 4px;
  font-size:1.15rem;
  line-height:1.4;
  color:var(--neon);
  text-shadow:0 0 16px rgba(135,255,113,.28);
}

.subtitle{
  margin:0 0 14px;
  font-size:16px;
  color:var(--dim);
}

.rail-list{margin:0 0 16px;padding:0;list-style:none}

.rail-list a{
  display:flex;
  align-items:center;
  gap:9px;
  min-height:var(--tap);
  padding:6px 4px;
  font-size:16px;
  color:#d6ecd0;
  text-decoration:none;
  border-bottom:1px dashed rgba(135,255,113,.16);
}
.rail-list a:hover,.rail-list a:focus-visible{color:var(--neon)}

.rail-list .ico{background:var(--cyan);box-shadow:0 0 9px var(--cyan)}

.to-top{
  display:flex;
  align-items:center;
  justify-content:center;
  width:100%;
  min-height:var(--tap);
  padding:8px;
  border:1px solid var(--line);
  border-radius:14px;
  font-size:16px;
  color:var(--neon);
  text-decoration:none;
}
.to-top:hover,.to-top:focus-visible{background:rgba(135,255,113,.14)}

/* ---------- 页脚 ---------- */
.foot{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:22px 18px;
  max-width:1160px;
  margin:0 auto;
  padding:16px 18px 42px;
  border-top:1px solid var(--line);
}

.cta{
  grid-column:1/-1;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:26px 22px;
  border:1px solid rgba(1,205,254,.32);
  border-radius:var(--r);
  background:linear-gradient(135deg,rgba(135,255,113,.16),rgba(1,205,254,.18));
}

.cta-line{
  margin:0;
  font-size:clamp(1.3rem,4.4vw,2rem);
  font-weight:700;
  color:#f2fff0;
  text-shadow:0 0 22px rgba(1,205,254,.42);
}

.cta-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:var(--tap);
  padding:10px 20px;
  border-radius:16px;
  font-size:16px;
  font-weight:700;
  color:#0b1509;
  text-decoration:none;
  background:linear-gradient(135deg,var(--neon),var(--cyan));
}
.cta-btn:hover,.cta-btn:focus-visible{filter:hue-rotate(-18deg)}

.foot-col{margin:0}

.foot-col dt{
  margin-bottom:6px;
  font-size:16px;
  letter-spacing:.1em;
  color:var(--cyan);
}

.foot-col dd{margin:0;font-size:16px;color:#cfe4c9}
.foot-col ul{margin:0;padding:0;list-style:none}

.foot-col li a,.foot-col dd > a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:4px 0;
  font-size:16px;
  color:#cfe4c9;
  text-decoration:none;
}
.foot-col a:hover,.foot-col a:focus-visible{color:var(--neon)}

.foot-bar{
  grid-column:1/-1;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding-top:14px;
  border-top:1px solid rgba(135,255,113,.14);
  font-size:16px;
  color:var(--dim);
}

.foot-bar a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:4px 8px;
  color:var(--neon);
  text-decoration:none;
}

/* ---------- 滚动显现 ---------- */
html.js .prose > div,
html.js .rail,
html.js .foot-col,
html.js .cta{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .5s ease,transform .55s cubic-bezier(.2,.7,.3,1);
}

html.js .in{opacity:1;transform:none}

/* ---------- 断点 ---------- */
@media(max-width:900px){
  .wrap{grid-template-columns:minmax(0,1fr);padding-top:22px}
  .rail{position:static;order:2;top:auto}
  .rail-list{display:grid;grid-template-columns:1fr 1fr;gap:0 12px}
  .rail-list a{border-bottom:1px dashed rgba(135,255,113,.14)}
  .prose > div{scroll-margin-top:196px}
}

@media(max-width:620px){
  .foot{grid-template-columns:1fr 1fr}
  .cta{flex-direction:column;align-items:flex-start}
  .ticker{letter-spacing:.08em}
}

@media(max-width:400px){
  .bar{padding-left:12px;padding-right:12px}
  .hero{padding-left:14px;padding-right:14px;min-height:0}
  .wrap{padding-left:14px;padding-right:14px}
  .foot{padding-left:14px;padding-right:14px}
  .rail-list{grid-template-columns:1fr}
}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  html.js .prose > div,
  html.js .rail,
  html.js .foot-col,
  html.js .cta{opacity:1;transform:none;transition:none}
  .hero-img{transform:none}
}

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