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

:root{
  --ink:#000000;
  --card:#121212;
  --line:#1c1c1c;
  --txt:#e6e6e6;
  --dim:#8b8b8b;
  --accent:#7cf7c8;
  --accent2:#7fb0ff;
  --radius:18px;
  --shadow:0 24px 52px rgba(0,0,0,.86);
  color-scheme:dark;
}

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

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  background:#000;
}

body{
  margin:0;
  background:var(--ink);
  color:var(--txt);
  font:400 17px/1.68 'Rubik',system-ui,-apple-system,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
p{margin:0 0 14px}
::selection{background:var(--accent);color:#03130d}

a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
  border-radius:8px;
}

.shell{display:block}

/* ---------- 顶栏 ---------- */
.topbar{
  position:fixed;
  inset:0 0 auto 0;
  z-index:40;
  background:rgba(0,0,0,.84);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid #141414;
}

.brandrow{
  max-width:1180px;
  margin:0 auto;
  padding:10px 20px 6px;
}

.logo{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:42px;
  font:700 1.1rem/1 'Outfit',sans-serif;
  letter-spacing:.02em;
  color:#fff;
}

.logo .mark{
  width:32px;
  height:32px;
  border-radius:10px;
  object-fit:cover;
  box-shadow:0 0 14px rgba(124,247,200,.28);
}

.menubar{
  max-width:1180px;
  margin:0 auto;
  padding:0 20px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  border-top:1px solid #121212;
}

.sitemenu{display:block}
.sitemenu summary{
  display:inline-flex;
  align-items:center;
  gap:11px;
  min-height:48px;
  padding:0 6px;
  cursor:pointer;
  list-style:none;
  font-weight:600;
  font-size:.9rem;
  letter-spacing:.24em;
  color:#dcdcdc;
}
.sitemenu summary::-webkit-details-marker{display:none}
.sitemenu summary::before{
  content:"";
  width:20px;
  height:2px;
  background:var(--accent);
  box-shadow:0 6px 0 var(--accent),0 -6px 0 var(--accent);
  transition:box-shadow .25s;
}
.sitemenu[open] summary{
  position:fixed;
  z-index:61;
  top:12px;
  right:18px;
  padding:0 16px;
  min-height:44px;
  border:1px solid #2b2b2b;
  border-radius:12px;
  background:#0a0a0a;
  letter-spacing:.18em;
}

.sitemenu menu{
  list-style:none;
  margin:0;
  padding:0;
}
.sitemenu[open] menu{
  position:fixed;
  inset:0;
  z-index:60;
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:4px;
  padding:92px 24px 44px;
  background:rgba(0,0,0,.97);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  overflow-y:auto;
}
.sitemenu[open] menu li{
  width:100%;
  max-width:540px;
  margin:0 auto;
}
.sitemenu[open] menu li a{
  display:block;
  padding:15px 8px;
  font:700 clamp(1.3rem,4.6vw,2.2rem)/1.24 'Outfit',sans-serif;
  letter-spacing:-.01em;
  color:#f2f2f2;
  border-bottom:1px solid rgba(255,255,255,.07);
  transition:color .22s,transform .22s;
}
.sitemenu[open] menu li a:hover{
  color:var(--accent);
  transform:translateX(10px);
  text-shadow:0 0 16px rgba(124,247,200,.45);
}

.cta{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:0 18px;
  border-radius:999px;
  background:var(--accent);
  color:#04150f;
  font-weight:700;
  font-size:.9rem;
  letter-spacing:.04em;
  box-shadow:0 0 20px rgba(124,247,200,.24);
  transition:transform .2s,filter .2s;
}
.cta:hover{transform:translateY(-2px);filter:brightness(1.12)}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  min-height:100svh;
  display:grid;
  place-items:center;
  text-align:center;
  padding:158px 20px 118px;
  overflow:hidden;
  background:radial-gradient(130% 78% at 50% 0%,#15181c 0%,#000 62%);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 74px),0 100%);
}

.hero-shot{position:absolute;inset:0;z-index:0}
.hero-shot img{width:100%;height:100%;object-fit:cover;opacity:.42}

.hero::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  background:radial-gradient(72% 58% at 50% 42%,rgba(0,0,0,.1),rgba(0,0,0,.93) 80%);
}

.hero-copy{
  position:relative;
  z-index:2;
  max-width:880px;
}

.kicker{
  display:inline-block;
  margin-bottom:20px;
  font-size:.78rem;
  font-weight:600;
  letter-spacing:.42em;
  color:var(--accent);
  text-shadow:0 0 12px rgba(124,247,200,.55);
}

.hero h1{
  margin:0;
  font:700 clamp(2.05rem,8.4vw,4.7rem)/1.07 'Outfit',sans-serif;
  letter-spacing:-.025em;
  color:#fff;
  text-shadow:0 0 30px rgba(255,255,255,.16);
  overflow-wrap:anywhere;
}

/* ---------- 正文骨架 ---------- */
.stage{
  max-width:1180px;
  margin:0 auto;
  padding:78px 20px 0;
  display:grid;
  grid-template-columns:236px minmax(0,1fr);
  gap:36px;
  align-items:start;
}

.rail{
  position:sticky;
  top:126px;
  align-self:start;
  background:#0b0b0b;
  border:1px solid #191919;
  border-radius:var(--radius);
  padding:22px 18px;
  box-shadow:0 20px 44px rgba(0,0,0,.72);
}

.rail h2{
  margin:0 0 10px;
  font:600 .76rem/1 'Rubik',sans-serif;
  letter-spacing:.26em;
  color:var(--dim);
}
.rail h2 span{color:var(--accent);text-shadow:0 0 10px rgba(124,247,200,.5)}

.rail ul{
  list-style:none;
  margin:0 0 22px;
  padding:0;
}
.rail li a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:6px 0;
  font-size:.94rem;
  color:#cdcdcd;
  border-bottom:1px dashed #1b1b1b;
  transition:color .2s,padding-left .2s;
}
.rail li a:hover{color:var(--accent);padding-left:6px}

.totop{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  font-size:.9rem;
  font-weight:600;
  color:var(--accent);
  letter-spacing:.06em;
}

.body{min-width:0}

.body > section{
  background:var(--card);
  border:1px solid #1b1b1b;
  border-radius:var(--radius);
  padding:34px 28px 22px;
  box-shadow:var(--shadow);
  scroll-margin-top:132px;
  transition:transform .35s ease,border-color .35s ease;
}
.body > section + section{margin-top:22px}
.body > section:hover{transform:translateY(-3px);border-color:#2b2b2b}

.body h2{
  display:flex;
  align-items:center;
  gap:12px;
  margin:0 0 16px;
  font:700 clamp(1.32rem,2.7vw,1.78rem)/1.26 'Outfit',sans-serif;
  letter-spacing:-.01em;
  color:#fff;
  scroll-margin-top:132px;
}
.body h2::before{
  content:"";
  flex:0 0 auto;
  width:6px;
  height:1.05em;
  border-radius:3px;
  background:var(--accent);
  box-shadow:0 0 14px rgba(124,247,200,.6);
}

.body h3{
  margin:22px 0 10px;
  font:600 1.16rem/1.4 'Outfit',sans-serif;
  color:#f0f0f0;
}

.body p{color:#cecece;line-height:1.82}

.body a{
  color:var(--accent2);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}
.body a:hover{color:var(--accent)}

.body ul,.body ol{
  margin:0 0 16px;
  padding-left:1.25em;
  color:#c8c8c8;
}
.body li{margin:.45em 0;line-height:1.75}

.body blockquote{
  margin:18px 0;
  padding:14px 18px;
  border-left:3px solid var(--accent);
  background:#0c0f0e;
  border-radius:0 14px 14px 0;
  color:#d8d8d8;
}

.body strong{color:#fff}
.body hr{border:0;border-top:1px solid #202020;margin:26px 0}

/* ---------- 页脚 ---------- */
.end{
  margin-top:92px;
  border-top:1px solid #161616;
  background:#050505;
  padding:58px 20px 26px;
}

.endgrid{
  max-width:1180px;
  margin:0 auto;
  display:grid;
  grid-template-columns:1.7fr 1fr 1fr 1fr;
  gap:34px;
}

.endgrid dl{margin:0}
.endgrid dt{
  margin-bottom:12px;
  font:600 .75rem/1 'Rubik',sans-serif;
  letter-spacing:.26em;
  color:var(--dim);
}
.endgrid dd{margin:0}
.endgrid dd a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  font-size:.95rem;
  color:#bcbcbc;
  transition:color .2s;
}
.endgrid dd a:hover{color:var(--accent)}

.subttl{
  margin:0 0 4px;
  font:600 .75rem/1 'Rubik',sans-serif;
  letter-spacing:.26em;
  color:var(--dim);
}

.sub form{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:12px;
}

.sub input{
  flex:1 1 160px;
  min-height:46px;
  padding:0 14px;
  border-radius:12px;
  border:1px solid #262626;
  background:#0d0d0d;
  color:#eee;
  font:inherit;
  font-size:.95rem;
}
.sub input::placeholder{color:#6c6c6c;letter-spacing:.14em}

.sub button{
  min-height:46px;
  padding:0 22px;
  border:0;
  border-radius:12px;
  background:var(--accent);
  color:#04150f;
  font-weight:700;
  font-size:.95rem;
  cursor:pointer;
  transition:filter .2s,transform .2s;
}
.sub button:hover{filter:brightness(1.1);transform:translateY(-1px)}

.copy{
  max-width:1180px;
  margin:38px auto 0;
  padding-top:18px;
  border-top:1px solid #131313;
  font-size:.85rem;
  color:#737373;
  letter-spacing:.05em;
}

/* ---------- 入场 ---------- */
.rv{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s ease,transform .6s ease;
}
.rv.in{opacity:1;transform:none}
.rv.in:hover{transform:translateY(-3px)}

@keyframes rise{
  from{opacity:0;transform:translateY(22px)}
  to{opacity:1;transform:none}
}
.hero-copy .kicker{animation:rise .6s ease both}
.hero h1{animation:rise .7s .1s ease both}

/* ---------- 断点 ---------- */
@media (max-width:900px){
  .stage{
    grid-template-columns:1fr;
    gap:26px;
    padding-top:52px;
  }
  .rail{position:static;top:auto}
  .rail ul{margin-bottom:16px}
  .endgrid{grid-template-columns:1fr 1fr;gap:28px}
  .sub{grid-column:1 / -1}
  .hero{padding-top:142px}
}

@media (max-width:560px){
  body{font-size:16px}
  .brandrow{padding:8px 16px 4px}
  .menubar{padding:0 16px}
  .hero{padding:134px 16px 96px;clip-path:polygon(0 0,100% 0,100% calc(100% - 48px),0 100%)}
  .kicker{letter-spacing:.3em;margin-bottom:14px}
  .stage{padding:44px 16px 0}
  .body > section{padding:26px 18px 16px;border-radius:14px}
  .endgrid{grid-template-columns:1fr}
  .end{padding:46px 16px 22px;margin-top:64px}
  .sitemenu[open] menu{padding:86px 18px 36px}
  .copy{margin-top:28px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none;transition:none}
  .body > section,.cta,.sub button{transition:none}
  .hero-copy .kicker,.hero h1{animation:none}
}

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