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

:root{
  --green:#00ff80;
  --blue:#0000ff;
  --ink:#000000;
  --fg:#ffffff;
  --rail:114px;
}

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

html{
  scroll-behavior:smooth;
  background:var(--ink);
}

body{
  margin:0;
  overflow-x:hidden;
  background-color:var(--ink);
  background-image:radial-gradient(rgba(0,255,128,.17) 1px,transparent 1.7px);
  background-size:16px 16px;
  color:var(--fg);
  font-family:'Noto Sans KR',system-ui,-apple-system,'Segoe UI','Microsoft YaHei',sans-serif;
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}

a{color:var(--green);text-decoration:none}
strong,b{font-weight:700;color:var(--green)}
img{max-width:100%}
p{margin:0 0 1.15em;max-width:70ch}
ul,ol{margin:0 0 1.2em;padding-left:1.4em}
li{margin:.4em 0}
blockquote{
  margin:1.4em 0;
  padding:16px 20px;
  border-left:6px solid var(--blue);
  background:#0a0a0a;
  border-radius:0;
}
hr{border:0;border-top:3px solid var(--blue);margin:2em 0}
::selection{background:var(--green);color:#000}
:focus-visible{outline:3px solid var(--green);outline-offset:3px}

/* ---------- 左侧固定竖栏 ---------- */
.rail{
  position:fixed;
  top:0;bottom:0;left:0;
  width:var(--rail);
  z-index:60;
  display:flex;
  flex-direction:column;
  gap:14px;
  padding:14px 12px;
  background:#000;
  border-right:3px solid var(--green);
}

.mark{
  display:flex;
  align-items:center;
  justify-content:center;
  height:58px;
  border:3px solid var(--green);
  background:#000;
  color:var(--green);
  font-weight:700;
  font-size:26px;
  overflow:hidden;
}
.mark:hover{background:var(--green);color:#000}
.mark img,.mark-img{display:block;width:100%;height:100%;object-fit:cover}

.menu-wrap{position:relative}
.menu-wrap>summary{
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:8px 4px;
  list-style:none;
  cursor:pointer;
  background:var(--blue);
  border:3px solid var(--blue);
  color:#fff;
  font-weight:700;
  font-size:16px;
  letter-spacing:.16em;
  user-select:none;
}
.menu-wrap>summary::-webkit-details-marker{display:none}
.menu-wrap>summary::marker{content:''}
.menu-wrap[open]>summary{background:#000;color:var(--green);border-color:var(--green)}

.menu-wrap menu{
  position:absolute;
  left:calc(100% + 14px);
  top:-3px;
  z-index:70;
  margin:0;
  padding:10px;
  list-style:none;
  display:grid;
  gap:8px;
  min-width:238px;
  background:#000;
  border:3px solid var(--green);
}
.menu-wrap menu a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 12px;
  border:2px solid #fff;
  color:#fff;
  font-weight:700;
  font-size:16px;
}
.menu-wrap menu a:hover,
.menu-wrap menu a:focus-visible{background:var(--green);color:#000;border-color:#000}

.rail-cta{
  margin-top:auto;
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  min-height:44px;
  padding:10px 6px;
  border:3px solid var(--green);
  border-radius:999px;
  color:var(--green);
  font-weight:700;
  font-size:16px;
  line-height:1.25;
}
.rail-cta:hover{background:var(--green);color:#000}

/* ---------- 主体骨架 ---------- */
.shell{margin-left:var(--rail)}

main{
  display:grid;
  grid-template-columns:minmax(0,1fr) 300px;
  gap:32px;
  align-items:start;
  padding:32px;
}

section{min-width:0;max-width:880px}

section>article{
  padding:46px 0;
  border-top:3px solid rgba(255,255,255,.24);
  scroll-margin-top:90px;
}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  isolation:isolate;
  display:grid;
  place-items:center;
  min-height:70vh;
  padding:64px 22px;
  border:3px solid var(--green);
  border-radius:18px;
  overflow:hidden;
  background:#000;
  background-image:radial-gradient(rgba(0,255,128,.3) 1.2px,transparent 1.9px);
  background-size:20px 20px;
}

.hero-shot{
  position:absolute;
  z-index:2;
  margin:0;
  width:min(36%,230px);
  border:3px solid var(--green);
  background:#111;
  transform:translate3d(0,var(--py,0px),0);
  will-change:transform;
}
.hero-shot .hero-img{display:block;width:100%;height:100%;aspect-ratio:3/4;object-fit:cover}
.shot-a{left:3%;top:7%}
.shot-b{right:3%;bottom:7%;border-color:var(--blue)}

.hero-inner{
  position:relative;
  z-index:3;
  max-width:24ch;
  padding:26px 22px;
  border:3px solid #fff;
  background:rgba(0,0,0,.72);
  text-align:center;
}
.hero h1{
  margin:0;
  font-size:clamp(2rem,7vw,4.4rem);
  line-height:1.06;
  font-weight:700;
  letter-spacing:-.02em;
  color:#fff;
  text-shadow:5px 5px 0 var(--blue);
}

/* ---------- 正文排版 ---------- */
h2{
  margin:.5em 0 .6em;
  font-size:clamp(1.45rem,3.2vw,2.1rem);
  line-height:1.25;
  font-weight:700;
  letter-spacing:-.01em;
}
h3{
  margin:1.4em 0 .5em;
  font-size:1.25rem;
  line-height:1.35;
  font-weight:700;
}
small{
  display:block;
  font-size:15px;
  font-weight:700;
  letter-spacing:.2em;
  color:var(--green);
  margin-bottom:10px;
}
h2 small,h3 small{margin:0 0 10px}
section a{border-bottom:2px solid var(--green)}
section a:hover{background:var(--green);color:#000}
section img{display:block;height:auto;border:3px solid var(--blue)}
section figure{margin:1.4em 0}

/* ---------- 右侧栏 ---------- */
.side{
  position:sticky;
  top:28px;
  display:grid;
  gap:14px;
  padding:18px;
  border:3px solid var(--blue);
  border-radius:18px;
  background:#000;
}
.side h2{margin:0;font-size:1.35rem;line-height:1.3;color:var(--green)}
.side small{margin:0;color:#fff;letter-spacing:.24em}
.side menu{
  margin:0;
  padding:0;
  list-style:none;
  display:grid;
  gap:8px;
}
.side menu a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:9px 12px;
  border:2px solid #fff;
  border-radius:18px;
  color:#fff;
  font-size:16px;
  line-height:1.4;
}
.side menu a:hover,
.side menu a:focus-visible{background:var(--blue);border-color:var(--green)}

/* ---------- 页脚 ---------- */
.site-foot{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) minmax(0,1.3fr) auto;
  gap:22px;
  align-items:center;
  margin-top:56px;
  padding:26px 32px 42px;
  border-top:3px solid var(--green);
  background:#000;
}
.f-mark{
  display:flex;
  align-items:center;
  justify-content:center;
  width:54px;
  height:54px;
  border:3px solid var(--green);
  color:var(--green);
  font-weight:700;
  font-size:24px;
  overflow:hidden;
}
.f-mark:hover{background:var(--green);color:#000}
.f-mark img{display:block;width:100%;height:100%;object-fit:cover}

.f-cta{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  flex-wrap:wrap;
  padding:14px 18px;
  border:3px solid var(--blue);
  border-radius:18px;
}
.f-cta strong{
  font-size:clamp(1.1rem,2.4vw,1.6rem);
  color:var(--green);
  letter-spacing:-.01em;
  line-height:1.2;
}
.f-top{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 16px;
  border:3px solid var(--green);
  border-radius:999px;
  color:var(--green);
  font-weight:700;
  font-size:16px;
}
.f-top:hover{background:var(--green);color:#000}

.f-nav{display:flex;flex-wrap:wrap;gap:8px}
.f-nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:6px 12px;
  border:2px solid #fff;
  border-radius:999px;
  color:#fff;
  font-size:15px;
  line-height:1.3;
}
.f-nav a:hover{background:var(--green);color:#000;border-color:#000}

.f-copy{
  text-align:right;
  color:#9c9c9c;
  font-size:15px;
  line-height:1.5;
  white-space:nowrap;
}

/* ---------- 平板 ---------- */
@media (max-width:1180px){
  main{grid-template-columns:minmax(0,1fr) 260px;gap:24px;padding:24px}
  .site-foot{grid-template-columns:auto minmax(0,1fr) auto;padding:24px}
  .f-nav{grid-column:1 / -1;order:4}
}

/* ---------- 移动 ---------- */
@media (max-width:900px){
  :root{--rail:0px}
  .rail{
    position:sticky;
    top:0;bottom:auto;left:0;
    width:auto;
    height:auto;
    flex-direction:row;
    align-items:center;
    gap:10px;
    padding:10px 12px;
    border-right:0;
    border-bottom:3px solid var(--green);
  }
  .mark{width:46px;height:46px;font-size:20px;flex:0 0 auto}
  .menu-wrap menu{left:0;top:calc(100% + 10px);min-width:220px}
  .rail-cta{margin:0 0 0 auto;padding:8px 14px;font-size:15px}

  .shell{margin-left:0}
  main{grid-template-columns:minmax(0,1fr);gap:22px;padding:16px}
  section{max-width:none}
  .side{position:static;order:2}
  section>article{padding:34px 0;scroll-margin-top:78px}

  .hero{min-height:58vh;padding:40px 14px}
  .hero-inner{padding:20px 14px;max-width:20ch}
  .hero-shot{width:33%}
  .shot-a{left:2%;top:4%}
  .shot-b{right:2%;bottom:4%}

  .site-foot{grid-template-columns:auto minmax(0,1fr);gap:16px;padding:18px 16px 32px}
  .f-cta{justify-content:flex-start}
  .f-nav{order:4}
  .f-copy{order:5;text-align:left;grid-column:1 / -1;white-space:normal}
}

@media (max-width:420px){
  body{font-size:16px}
  .hero h1{font-size:1.9rem;text-shadow:4px 4px 0 var(--blue)}
  .hero-shot{width:30%}
  .f-nav a{font-size:14px}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .hero-shot{transform:none}
}

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