/* ============================================================
   阿奇带你环游世界 · 站群首页
   Web3 暗色霓虹风格
   ============================================================ */
:root{
  --bg:#07090B;
  --bg-2:#0D1114;
  --panel:rgba(255,255,255,.035);
  --panel-brd:rgba(255,255,255,.09);
  --orange:#E86A17;
  --orange-2:#FF9440;
  --cyan:#28E0C8;
  --txt:#EAF0F2;
  --txt-dim:#93A0A6;
  --txt-mute:#5A666C;
  --radius:18px;
  --font-body:'Noto Sans SC',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',monospace;
  --font-disp:'ZCOOL QingKe HuangYou','Noto Sans SC',sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--txt);font-family:var(--font-body);
  line-height:1.7;overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
::selection{background:var(--orange);color:#fff}

/* ---------- 背景 ---------- */
.grain{
  position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.035;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.grid-bg{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 90% 72% at 50% 0%,#000 30%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse 90% 72% at 50% 0%,#000 30%,transparent 78%);
}
.container{max-width:1200px;margin:0 auto;padding:0 28px;position:relative;z-index:2}
.section{padding:110px 0;position:relative;z-index:2}
.section-dark{background:linear-gradient(180deg,transparent,rgba(232,106,23,.035),transparent)}

/* ---------- NAV ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:background .35s,backdrop-filter .35s,border-color .35s;border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(7,9,11,.82);backdrop-filter:blur(16px);border-bottom-color:var(--panel-brd)}
.nav-inner{max-width:1200px;margin:0 auto;padding:16px 28px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:16px}
.brand-dot{width:10px;height:10px;border-radius:50%;background:var(--orange);box-shadow:0 0 12px var(--orange);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.8)}}
.brand-text em{color:var(--orange);font-style:normal}
.nav-links{display:flex;gap:26px;margin-left:auto;font-size:14px;color:var(--txt-dim)}
.nav-links a{transition:color .25s}
.nav-links a:hover{color:var(--orange)}
.nav-cta{display:flex;align-items:center;gap:7px;font-size:14px;font-weight:500;padding:9px 18px;border-radius:100px;background:linear-gradient(135deg,var(--orange),var(--orange-2));color:#fff;box-shadow:0 0 24px rgba(232,106,23,.35);transition:transform .25s,box-shadow .25s}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 0 32px rgba(232,106,23,.55)}
@media(max-width:900px){.nav-links{display:none}}

/* ---------- HERO ---------- */
.hero{min-height:100vh;display:flex;flex-direction:column;justify-content:center;padding:140px 0 80px;position:relative;z-index:2;overflow:hidden}
.hero-glow{position:absolute;top:-22%;right:-12%;width:760px;height:760px;border-radius:50%;background:radial-gradient(circle,rgba(232,106,23,.22),transparent 68%);filter:blur(64px);animation:floaty 9s ease-in-out infinite}
@keyframes floaty{0%,100%{transform:translate(0,0)}50%{transform:translate(-30px,30px)}}
.hero-inner{max-width:1200px;margin:0 auto;padding:0 28px;width:100%;display:grid;grid-template-columns:1.25fr .75fr;gap:60px;align-items:center}
.tag-line{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--cyan);text-transform:uppercase;padding:7px 15px;border-radius:100px;border:1px solid rgba(40,224,200,.28);background:rgba(40,224,200,.05);margin-bottom:26px}
.tag-line .pulse{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.hero-title{font-family:var(--font-disp);font-size:clamp(48px,8vw,104px);line-height:1.04;font-weight:400;margin-bottom:26px}
.hl{color:var(--orange);text-shadow:0 0 36px rgba(232,106,23,.5)}
.hl2{color:var(--cyan);text-shadow:0 0 36px rgba(40,224,200,.45)}
.hero-sub{font-size:17px;color:var(--txt-dim);max-width:520px;margin-bottom:36px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:52px}
.btn{display:inline-flex;align-items:center;gap:9px;padding:15px 30px;border-radius:100px;font-size:15px;font-weight:500;transition:transform .25s,box-shadow .25s,background .25s;cursor:pointer}
.btn-primary{background:linear-gradient(135deg,var(--orange),var(--orange-2));color:#fff;box-shadow:0 0 30px rgba(232,106,23,.4)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 0 46px rgba(232,106,23,.6)}
.btn-ghost{border:1px solid var(--panel-brd);color:var(--txt);background:var(--panel);backdrop-filter:blur(8px)}
.btn-ghost:hover{transform:translateY(-3px);border-color:var(--orange);color:var(--orange-2)}
.hero-stats{display:flex;gap:46px}
.stat{display:flex;flex-direction:column}
.stat-num{font-family:var(--font-mono);font-size:38px;font-weight:700;color:var(--orange);line-height:1}
.stat-lbl{font-size:13px;color:var(--txt-mute);margin-top:7px}

/* hero 右侧 */
.hero-right{display:flex;flex-direction:column;align-items:center;gap:26px}
.arki-float{position:relative;width:320px;height:320px;display:grid;place-items:center}
.arki-ring{position:absolute;inset:0;border-radius:50%;border:1px dashed rgba(232,106,23,.4);animation:spin 22s linear infinite}
.arki-ring-2{inset:28px;border-color:rgba(40,224,200,.28);animation:spin 32s linear infinite reverse}
.arki-ring::before{content:'';position:absolute;top:0;left:50%;width:9px;height:9px;border-radius:50%;background:var(--orange);box-shadow:0 0 16px var(--orange);transform:translate(-50%,-50%)}
.arki-ring-2::before{background:var(--cyan);box-shadow:0 0 16px var(--cyan)}
@keyframes spin{to{transform:rotate(360deg)}}
.arki-img{width:240px;filter:drop-shadow(0 0 46px rgba(232,106,23,.45));animation:bob 4.5s ease-in-out infinite}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-18px)}}
.arki-bubble{position:relative;max-width:270px;text-align:center;padding:15px 22px;border-radius:16px;font-size:14px;color:var(--txt-dim);background:var(--panel);border:1px solid var(--panel-brd);backdrop-filter:blur(10px)}
.arki-bubble .bubble-name{display:block;font-weight:700;color:var(--orange);font-size:13px;margin-bottom:3px}
.scroll-hint{position:absolute;bottom:34px;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:7px;font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--txt-mute);text-transform:uppercase}
.scroll-hint i{animation:bob 2s infinite}
@media(max-width:900px){
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .hero-right{order:-1}
  .arki-float{width:230px;height:230px}
  .arki-img{width:175px}
  .hero-stats{gap:28px}
}

/* ---------- SECTION HEAD ---------- */
.sec-head{max-width:720px;margin-bottom:60px}
.sec-tag{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.1em;color:var(--cyan);margin-bottom:16px}
.sec-title{font-family:var(--font-disp);font-size:clamp(30px,4.2vw,50px);line-height:1.16;font-weight:400;margin-bottom:20px}
.sec-desc{font-size:16px;color:var(--txt-dim);max-width:640px}

/* ---------- CITY GRID ---------- */
.city-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.city-card{
  position:relative;display:block;border-radius:20px;overflow:hidden;aspect-ratio:4/5;
  border:1px solid var(--panel-brd);cursor:pointer;
  transition:transform .38s cubic-bezier(.22,1,.36,1),border-color .38s,box-shadow .38s;
}
.city-card.live:hover{transform:translateY(-8px);border-color:var(--orange);box-shadow:0 26px 60px rgba(0,0,0,.6),0 0 44px rgba(232,106,23,.2)}
.city-bg{position:absolute;inset:0;background-size:cover;background-position:center;transition:transform .7s;filter:saturate(.9) brightness(.6)}
.city-card.live:hover .city-bg{transform:scale(1.09);filter:saturate(1.1) brightness(.72)}
.city-veil{position:absolute;inset:0;background:linear-gradient(180deg,rgba(7,9,11,.15) 0%,rgba(7,9,11,.55) 45%,rgba(7,9,11,.95) 100%)}
.city-content{position:absolute;left:0;right:0;bottom:0;padding:26px;z-index:3}
.city-badge{position:absolute;top:18px;right:18px;z-index:3;font-family:var(--font-mono);font-size:11px;font-weight:700;padding:5px 13px;border-radius:100px;backdrop-filter:blur(6px)}
.city-badge.live{color:#fff;background:linear-gradient(135deg,var(--orange),var(--orange-2));box-shadow:0 0 22px rgba(232,106,23,.55)}
.city-badge.soon{color:var(--cyan);background:rgba(40,224,200,.1);border:1px solid rgba(40,224,200,.32)}
.city-en{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;color:var(--orange-2);text-transform:uppercase;margin-bottom:7px}
.city-name{font-family:var(--font-disp);font-size:34px;font-weight:400;line-height:1.1;margin-bottom:9px}
.city-desc{font-size:13.5px;color:var(--txt-dim);line-height:1.6;margin-bottom:14px}
.city-tags{display:flex;gap:7px;flex-wrap:wrap}
.city-tags span{font-size:11.5px;color:var(--txt-dim);padding:4px 10px;border-radius:100px;background:rgba(255,255,255,.06);border:1px solid var(--panel-brd)}
.city-enter{display:flex;align-items:center;gap:7px;margin-top:16px;font-size:13.5px;font-weight:600;color:var(--orange-2);transition:gap .3s}
.city-card.live:hover .city-enter{gap:12px}
.city-card.soon{opacity:.62;cursor:not-allowed}
.city-card.soon .city-bg{filter:saturate(.4) brightness(.45)}
@media(max-width:1000px){.city-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.city-grid{grid-template-columns:1fr}}

/* ---------- ABOUT ---------- */
.about-layout{display:grid;grid-template-columns:.85fr 1.15fr;gap:64px;align-items:center}
.about-visual{display:flex;flex-direction:column;align-items:center;gap:22px}
.arki-showcase{position:relative;width:300px;height:300px;display:grid;place-items:center}
.as-ring{position:absolute;inset:0;border-radius:50%;border:1px dashed rgba(232,106,23,.35);animation:spin 26s linear infinite}
.as-ring::before{content:'';position:absolute;top:0;left:50%;width:10px;height:10px;border-radius:50%;background:var(--orange);box-shadow:0 0 18px var(--orange);transform:translate(-50%,-50%)}
.as-img{width:220px;filter:drop-shadow(0 0 42px rgba(232,106,23,.45));animation:bob 5s ease-in-out infinite}
.as-caption{font-family:var(--font-mono);font-size:12.5px;color:var(--txt-mute);letter-spacing:.06em}
.about-body .sec-title{margin-bottom:18px}
.about-lead{font-size:16px;color:var(--txt-dim);margin-bottom:36px;max-width:560px}
.about-feats{display:flex;flex-direction:column;gap:22px}
.af-item{display:flex;gap:18px;align-items:flex-start}
.af-item > i{flex-shrink:0;width:46px;height:46px;border-radius:13px;display:grid;place-items:center;font-size:22px;color:var(--orange);background:rgba(232,106,23,.1);border:1px solid rgba(232,106,23,.28)}
.af-item h3{font-size:16.5px;font-weight:700;margin-bottom:5px}
.af-item p{font-size:14px;color:var(--txt-dim);line-height:1.65}
@media(max-width:900px){.about-layout{grid-template-columns:1fr;gap:44px}}

/* ---------- STEPS ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.step-card{position:relative;overflow:hidden;padding:36px 30px;border-radius:var(--radius);background:var(--panel);border:1px solid var(--panel-brd);backdrop-filter:blur(10px);transition:transform .3s,border-color .3s,box-shadow .3s}
.step-card:hover{transform:translateY(-6px);border-color:rgba(232,106,23,.5);box-shadow:0 22px 52px rgba(0,0,0,.5)}
.step-num{position:absolute;top:18px;right:22px;font-family:var(--font-mono);font-size:44px;font-weight:700;color:rgba(232,106,23,.13);line-height:1}
.step-ic{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;font-size:26px;color:var(--orange);margin-bottom:20px;background:rgba(232,106,23,.1);border:1px solid rgba(232,106,23,.28)}
.step-card h3{font-size:19px;font-weight:700;margin-bottom:11px}
.step-card p{font-size:14.5px;color:var(--txt-dim)}
@media(max-width:820px){.steps{grid-template-columns:1fr}}

/* ---------- FOOTER ---------- */
.footer{border-top:1px solid var(--panel-brd);padding:44px 0;position:relative;z-index:2;background:var(--bg-2)}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap}
.foot-brand{display:flex;align-items:center;gap:14px}
.foot-arki{width:48px;filter:drop-shadow(0 0 16px rgba(232,106,23,.5))}
.foot-name{font-size:15px;font-weight:700}
.foot-sub{font-size:12.5px;color:var(--txt-mute)}
.foot-meta{display:flex;gap:22px;font-family:var(--font-mono);font-size:12.5px;color:var(--txt-mute);flex-wrap:wrap}
.foot-meta span{display:inline-flex;align-items:center;gap:7px}

/* ---------- 动画 ---------- */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .8s cubic-bezier(.22,1,.36,1),transform .8s cubic-bezier(.22,1,.36,1)}
.reveal.on{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}

/* ---------- 语言切换 ---------- */
.lang-switch{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border-radius:100px;
  font-family:var(--font-mono);font-size:12.5px;font-weight:600;
  color:var(--txt-dim);background:var(--panel);
  border:1px solid var(--panel-brd);backdrop-filter:blur(8px);
  transition:border-color .25s,color .25s,transform .25s,box-shadow .25s;
  margin-left:6px;white-space:nowrap;
}
.lang-switch:hover{border-color:var(--orange);transform:translateY(-2px);box-shadow:0 0 20px rgba(232,106,23,.28)}
.lang-switch i{color:var(--orange);font-size:15px}
.lang-opt{color:var(--txt-mute);transition:color .2s}
.lang-opt.active{color:var(--orange)}
.lang-sep{color:var(--txt-mute);opacity:.5}
@media(max-width:640px){.lang-switch{padding:7px 11px;font-size:12px}}