/* === Reset & Base === */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#070814;
  --bg-2:#0c0e22;
  --bg-3:#11142e;
  --surface:rgba(22,25,54,.5);
  --surface-2:rgba(30,34,70,.7);
  --gold:#f6b73c;
  --gold-bright:#ffce6b;
  --gold-deep:#c98a1c;
  --teal:#2ee6d6;
  --teal-deep:#16b6a8;
  --purple:#8b6cff;
  --text:#f2efff;
  --text-2:#c7c3e8;
  --text-3:#8a87ad;
  --border:rgba(246,183,60,.22);
  --border-2:rgba(246,183,60,.12);
  --radius:16px;
  --radius-sm:10px;
  --maxw:1200px;
}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:'Noto Sans SC',sans-serif;
  background:var(--bg);color:var(--text);line-height:1.65;overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{text-decoration:none;color:inherit}
button{cursor:pointer;border:none;background:none;color:inherit;font-family:inherit}
ul{list-style:none}
input,select,textarea{font-family:inherit;color:inherit}

/* === 背景音乐控制 === */
.bg-music-control{
  position:fixed;right:24px;bottom:24px;z-index:200;
}
.music-btn{
  width:50px;height:50px;border-radius:50%;background:var(--bg-3);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;color:var(--gold);cursor:pointer;
  box-shadow:0 6px 20px rgba(0,0,0,.4);transition:all .3s;
}
.music-btn:hover{border-color:var(--gold);transform:scale(1.06)}
.icon-music,.icon-pause{transition:all .2s}
.icon-pause{display:none}
.music-btn.playing .icon-music{display:none}
.music-btn.playing .icon-pause{display:block}
.music-btn.playing{animation:musicPulse 2s ease-in-out infinite}
@keyframes musicPulse{0%,100%{box-shadow:0 6px 20px rgba(246,183,60,.3)}50%{box-shadow:0 6px 30px rgba(246,183,60,.6)}}

/* === Nav === */
#nav{
  position:fixed;top:0;left:0;width:100%;z-index:100;
  background:rgba(7,8,20,.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border-2);transition:all .3s;
}
#nav.scrolled{background:rgba(7,8,20,.95);border-bottom-color:var(--border)}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:.7rem 2rem;
}
.logo{display:flex;align-items:center;gap:.6rem;font-weight:900;font-size:1.25rem;color:var(--gold)}
.logo-mascot{width:40px;height:40px;object-fit:contain;filter:drop-shadow(0 0 6px rgba(246,183,60,.4))}
.logo small{color:var(--text-2);margin:0 .2rem}
.logo-accent{color:var(--teal)}
.nav-links{display:flex;align-items:center;gap:2rem}
.nav-links a{font-size:.9rem;color:var(--text-2);font-weight:500;transition:color .2s}
.nav-links a:hover{color:var(--gold)}
.nav-cta{padding:.5rem 1.3rem;border:1px solid var(--gold);border-radius:40px;color:var(--gold)!important;transition:all .25s}
.nav-cta:hover{background:var(--gold);color:var(--bg)!important}
.menu-toggle{display:none;color:var(--gold)}
.nav-mobile{display:none;flex-direction:column;padding:0 2rem;background:rgba(7,8,20,.95);border-bottom:1px solid var(--border)}
.nav-mobile a{padding:.8rem 0;color:var(--text-2);border-bottom:1px solid var(--border-2)}
.nav-mobile a:last-child{border-bottom:none}

/* === Hero === */
#hero{
  position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;
  overflow:hidden;padding:6rem 2rem 3rem;
}
.hero-bg{
  position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(ellipse at 50% 20%,rgba(246,183,60,.14),transparent 50%),
    radial-gradient(ellipse at 30% 80%,rgba(46,230,214,.12),transparent 50%),
    radial-gradient(ellipse at 75% 70%,rgba(139,108,255,.1),transparent 50%),
    linear-gradient(180deg,#070814 0%,#0c0e22 50%,#070814 100%);
}
.hero-bg::before{
  content:'';position:absolute;inset:0;opacity:.05;
  background-image:linear-gradient(rgba(242,239,255,.4) 1px,transparent 1px),linear-gradient(90deg,rgba(242,239,255,.4) 1px,transparent 1px);
  background-size:48px 48px;
}
.hero-bg::after{
  content:'';position:absolute;bottom:0;left:0;right:0;height:220px;
  background:linear-gradient(180deg,transparent,var(--bg));
}
.hero-content{max-width:860px;margin:0 auto;position:relative;z-index:1}
.hero-mascot{margin-bottom:1.6rem;display:flex;justify-content:center}
.hero-mascot img{width:260px;height:auto;filter:drop-shadow(0 10px 40px rgba(246,183,60,.25));animation:floatMascot 4s ease-in-out infinite}
@keyframes floatMascot{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
.hero-tag{
  display:inline-block;padding:.45rem 1.3rem;border:1px solid var(--border);border-radius:40px;
  font-size:.85rem;color:var(--text-2);letter-spacing:.1em;margin-bottom:1.4rem;background:rgba(246,183,60,.05);
}
#hero h1{
  font-family:'Noto Serif SC',serif;font-weight:900;
  font-size:clamp(2.4rem,6vw,4rem);line-height:1.1;letter-spacing:.02em;margin-bottom:1.2rem;
}
.accent{color:var(--teal)}
.hero-sub{font-size:clamp(.95rem,2vw,1.1rem);color:var(--text-2);max-width:600px;margin:0 auto 2.4rem;font-weight:300}
.btn-primary{
  padding:.9rem 2.2rem;background:linear-gradient(135deg,var(--gold),var(--gold-deep));
  color:#1a1406;border-radius:40px;font-weight:700;transition:all .3s;box-shadow:0 4px 24px rgba(246,183,60,.35);display:inline-block;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 32px rgba(246,183,60,.5)}
.btn-ghost{
  padding:.9rem 2.2rem;border:1px solid var(--border);color:var(--text);border-radius:40px;font-weight:500;transition:all .3s;display:inline-block;
}
.btn-ghost:hover{border-color:var(--teal);color:var(--teal)}
.hero-cta{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}
.hero-scroll{margin-top:3rem;font-size:.8rem;color:var(--text-3);display:flex;flex-direction:column;align-items:center;gap:.4rem;animation:scrollBounce 2s ease-in-out infinite}
@keyframes scrollBounce{0%,100%{transform:translateY(0)}50%{transform:translateY(8px)}}

/* === Data Banner === */
#data{position:relative;z-index:1;padding:1rem 2rem 4rem}
.data-banner{
  max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;
  padding:2.4rem 2.5rem;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);backdrop-filter:blur(10px);
}
.data-item{text-align:center}
.data-item strong{display:block;font-family:'Noto Serif SC',serif;font-size:clamp(1.6rem,3.5vw,2.6rem);color:var(--gold-bright)}
.data-item span{font-size:.85rem;color:var(--text-3)}

/* === Section Head === */
.section-head{max-width:var(--maxw);margin:0 auto;padding:5rem 2rem 2.5rem;text-align:center}
.section-tag{display:inline-block;font-size:.78rem;color:var(--teal);letter-spacing:.16em;margin-bottom:.8rem;font-weight:700;text-transform:uppercase}
.section-head h2{font-family:'Noto Serif SC',serif;font-weight:900;font-size:clamp(1.8rem,4.5vw,2.6rem);line-height:1.2;margin-bottom:1rem}
.section-desc{color:var(--text-2);max-width:620px;margin:0 auto;font-weight:300}

/* === AI === */
#ai,#ark,#arkie{position:relative;z-index:1}
.ai-wrap{max-width:var(--maxw);margin:0 auto;padding:0 2rem;display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}
.ai-visual{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3}
.ai-visual img{width:100%;height:100%;object-fit:cover}
.ai-float-card{
  position:absolute;bottom:-24px;left:50%;transform:translateX(-50%);background:var(--bg-3);
  border:1px solid var(--border);border-radius:16px;padding:.7rem 1.2rem;display:flex;align-items:center;gap:.6rem;box-shadow:0 12px 40px rgba(0,0,0,.5);white-space:nowrap;
}
.ai-float-card img{width:40px;height:40px;object-fit:contain}
.ai-float-card p{font-size:.85rem;color:var(--text-2);white-space:nowrap}
.ai-features{display:flex;flex-direction:column;gap:1.4rem;padding:1rem 0}
.ai-feature{display:flex;align-items:flex-start;gap:1.1rem}
.feat-icon{
  width:52px;height:52px;flex-shrink:0;border-radius:14px;display:flex;align-items:center;justify-content:center;
  background:var(--surface-2);border:1px solid var(--border);color:var(--gold);
}
.ai-feature h4{font-size:1.05rem;margin-bottom:.25rem;color:var(--text)}
.ai-feature p{font-size:.88rem;color:var(--text-2);font-weight:300}

/* === Ark === */
.ark-wrap{max-width:var(--maxw);margin:0 auto;padding:0 2rem;display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}
.ark-visual{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3;height:100%}
.ark-visual img{width:100%;height:100%;object-fit:cover}
.ecosystem-overlay{
  position:absolute;bottom:0;left:0;right:0;padding:1rem;font-size:.85rem;color:var(--text);
  background:linear-gradient(180deg,transparent,rgba(7,8,20,.9));
}
.ark-cards{display:flex;flex-direction:column;gap:1.2rem}
.ark-card{background:var(--surface);border:1px solid var(--border-2);border-radius:var(--radius);padding:1.6rem;transition:all .3s}
.ark-card:hover{border-color:var(--border);background:var(--surface-2);transform:translateX(4px)}
.card-tag{font-size:.8rem;font-weight:700;color:var(--teal);letter-spacing:.1em}
.ark-card h4{font-size:1.15rem;color:var(--gold);margin:.4rem 0}
.ark-card p{font-size:.88rem;color:var(--text-2);font-weight:300}

/* === ARKIE === */
.arkie-wrap{max-width:var(--maxw);margin:0 auto;padding:0 2rem;display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
.arkie-info{display:flex;flex-direction:column;gap:1rem}
.arkie-item{
  display:flex;justify-content:space-between;align-items:center;background:var(--surface);
  border:1px solid var(--border-2);border-radius:var(--radius-sm);padding:1rem 1.3rem;
}
.arkie-item span{font-size:.85rem;color:var(--text-3)}
.arkie-item strong{font-size:.95rem;color:var(--text)}
.arkie-allocation{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.8rem}
.arkie-allocation h4{font-family:'Noto Serif SC',serif;font-size:1.1rem;color:var(--gold);margin-bottom:1.2rem}
.alloc-list{display:flex;flex-direction:column;gap:.8rem}
.alloc-row{display:flex;align-items:center;gap:.8rem}
.alloc-row span:nth-child(2){flex:1;font-size:.9rem;color:var(--text-2)}
.alloc-row b{font-size:.9rem;color:var(--gold-bright)}
.dot{width:12px;height:12px;border-radius:50%;flex-shrink:0}
.dot-yellow{background:#f6b73c}.dot-teal{background:#2ee6d6}.dot-purple{background:#8b6cff}
.dot-blue{background:#4da3ff}.dot-green{background:#35d07f}.dot-pink{background:#ff5d8f}.dot-orange{background:#ff8c3c}

/* === AI趋势与对比 === */
#aitrend{position:relative;z-index:1;padding-bottom:2rem}
.trend-wrap{max-width:var(--maxw);margin:0 auto;padding:0 2rem;display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:start}
.trend-block,.compare-block{background:var(--surface);border:1px solid var(--border-2);border-radius:var(--radius);padding:1.8rem}
.trend-head{display:flex;align-items:center;gap:.8rem;margin-bottom:1.4rem}
.trend-num{font-family:'Noto Serif SC',serif;font-size:1.2rem;font-weight:900;color:var(--gold);opacity:.7}
.teal-num{color:var(--teal)}
.trend-head h3{font-family:'Noto Serif SC',serif;font-size:1.2rem;color:var(--text)}
.trend-list{display:flex;flex-direction:column;gap:1.1rem}
.trend-item{display:flex;align-items:flex-start;gap:.8rem}
.t-icon{width:44px;height:44px;flex-shrink:0;border-radius:12px;display:flex;align-items:center;justify-content:center;background:var(--surface-2);border:1px solid var(--border);color:var(--gold)}
.trend-item h4{font-size:1rem;color:var(--text);margin-bottom:.2rem}
.trend-item p{font-size:.83rem;color:var(--text-2);font-weight:300}
.compare-table{display:flex;flex-direction:column;border:1px solid var(--border-2);border-radius:var(--radius-sm);overflow:hidden}
.compare-row{display:grid;grid-template-columns:1fr 1fr 1fr;border-bottom:1px solid var(--border-2)}
.compare-row:last-child{border-bottom:none}
.compare-row>span{padding:.75rem .8rem;font-size:.82rem}
.compare-head{background:var(--surface-2)}
.compare-head .c-cat{color:var(--text-3)}
.compare-head .c-old{color:var(--text-3)}
.compare-head .c-new{color:var(--gold);font-weight:700}
.c-cat{color:var(--text-2);border-right:1px solid var(--border-2)}
.c-old{color:var(--text-3)}
.c-new{color:var(--teal);border-left:1px solid var(--border-2)}
.future-block{max-width:var(--maxw);margin:2rem auto 0;padding:0 2rem}
.future-inner{background:linear-gradient(135deg,var(--surface-2),var(--surface));border:1px solid var(--border);border-radius:var(--radius);padding:2.2rem;text-align:center}
.future-inner h3{font-family:'Noto Serif SC',serif;font-size:1.3rem;color:var(--gold);margin-bottom:1rem}
.future-inner p{color:var(--text-2);font-weight:300;max-width:760px;margin:0 auto 1.2rem}
.future-dots{display:flex;justify-content:center;gap:.8rem;flex-wrap:wrap}
.future-dots span{font-size:.85rem;color:var(--teal);border:1px solid var(--border);border-radius:30px;padding:.3rem 1rem}

/* === App产品界面展示 === */
#app-show{position:relative;z-index:1;padding-bottom:2rem}
.app-gallery{
  max-width:var(--maxw);margin:0 auto;padding:0 2rem;
  display:grid;grid-template-columns:repeat(4,1fr);gap:1.4rem;
}
.app-card{background:var(--surface);border:1px solid var(--border-2);border-radius:var(--radius);padding:1.2rem;text-align:center;transition:all .35s}
.app-card:hover{transform:translateY(-6px);border-color:var(--border);box-shadow:0 20px 50px rgba(0,0,0,.4)}
.phone-frame{
  width:100%;max-width:230px;margin:0 auto 1rem;border-radius:22px;overflow:hidden;
  border:2px solid var(--border);background:#000;box-shadow:0 8px 30px rgba(0,0,0,.5);
}
.phone-frame img{width:100%;height:auto;display:block}
.app-caption h4{font-family:'Noto Serif SC',serif;font-size:1rem;color:var(--gold);margin-bottom:.3rem}
.app-caption p{font-size:.8rem;color:var(--text-2);font-weight:300}

/* === 智能体与生态 === */
#agents{position:relative;z-index:1;padding-bottom:2rem}
.agents-grid{
  max-width:var(--maxw);margin:0 auto;padding:0 2rem;
  display:grid;grid-template-columns:repeat(5,1fr);gap:1.4rem;
}
.agent-card{background:var(--surface);border:1px solid var(--border-2);border-radius:var(--radius);padding:1.2rem;text-align:center;transition:all .35s}
.agent-card:hover{transform:translateY(-6px);border-color:var(--border);box-shadow:0 20px 50px rgba(0,0,0,.4)}
.agent-caption h4{font-family:'Noto Serif SC',serif;font-size:.98rem;color:var(--teal);margin-bottom:.3rem}
.agent-caption p{font-size:.78rem;color:var(--text-2);font-weight:300}
.agents-note{max-width:var(--maxw);margin:1.5rem auto 0;padding:0 2rem;display:flex;flex-direction:column;gap:.4rem}
.agents-note p{font-size:.9rem;color:var(--text-2);background:var(--surface);border:1px solid var(--border-2);border-radius:var(--radius-sm);padding:.7rem 1.2rem}
.agents-note strong{color:var(--gold)}

/* === 创作案例（作品画廊/视频/线下会议） === */
#works{position:relative;z-index:1;padding-bottom:2rem}
.gallery-wrap,.video-wrap,.event-wrap{max-width:var(--maxw);margin:0 auto;padding:0 2rem 2.5rem}
.gallery-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:1.3rem}
.gallery-head h3{font-family:'Noto Serif SC',serif;font-size:1.25rem;color:var(--text)}
.gallery-head span{font-size:.8rem;color:var(--text-3)}
.gallery-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem}
.gallery-item{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border-2);position:relative;transition:all .35s}
.gallery-item:hover{transform:scale(1.02);border-color:var(--border)}
.gallery-item img{width:100%;height:280px;object-fit:cover;display:block}
.gallery-item figcaption{position:absolute;bottom:0;left:0;right:0;padding:.8rem;font-size:.85rem;color:#fff;background:linear-gradient(180deg,transparent,rgba(0,0,0,.85))}
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem}
.video-item{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border-2);background:var(--bg-3);transition:all .35s}
.video-item:hover{border-color:var(--border);transform:translateY(-4px)}
.video-item video{width:100%;height:220px;object-fit:cover;display:block}
.video-item p{padding:.7rem;font-size:.85rem;color:var(--text-2)}
.event-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}
.event-item{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border-2);background:var(--bg-3);transition:all .35s}
.event-item:hover{border-color:var(--border);transform:translateY(-4px)}
.event-item video{width:100%;height:auto;display:block}
.event-info{padding:1rem 1.3rem}
.event-info h4{font-family:'Noto Serif SC',serif;font-size:1.05rem;color:var(--gold);margin-bottom:.3rem}
.event-info p{font-size:.8rem;color:var(--text-2);font-weight:300;margin-bottom:.6rem}
.event-badge{display:inline-block;font-size:.72rem;color:var(--teal);border:1px solid var(--border);padding:.15rem .6rem;border-radius:30px}

/* === ARKIE 经济机制图解卡 === */
.arkie-cards{max-width:var(--maxw);margin:1.5rem auto 0;padding:0 2rem;display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}
.arkie-card{background:var(--surface);border:1px solid var(--border-2);border-radius:var(--radius);overflow:hidden;transition:all .35s}
.arkie-card:hover{border-color:var(--border);transform:translateY(-4px)}
.arkie-card img{width:100%;height:auto;display:block}
.arkie-card-caption{padding:1.1rem 1.3rem}
.arkie-card-caption h4{font-family:'Noto Serif SC',serif;font-size:1.05rem;color:var(--gold);margin-bottom:.3rem}
.arkie-card-caption p{font-size:.83rem;color:var(--text-2);font-weight:300}

/* === Team 专业团队 === */
#team{position:relative;z-index:1;padding-bottom:2rem}
.team-wrap{max-width:var(--maxw);margin:0 auto;padding:0 2rem;display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}
.team-stats{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem}
.team-stat{background:var(--surface);border:1px solid var(--border-2);border-radius:var(--radius);padding:1.5rem;text-align:center;transition:all .3s}
.team-stat:hover{border-color:var(--border);transform:translateY(-4px)}
.team-stat img{width:64px;height:64px;object-fit:cover;border-radius:14px;margin:0 auto .8rem}
.team-stat strong{display:block;font-family:'Noto Serif SC',serif;font-size:1.6rem;color:var(--gold-bright)}
.team-stat span{font-size:.82rem;color:var(--text-3)}
.team-desc h3{font-family:'Noto Serif SC',serif;font-size:1.3rem;color:var(--teal);margin-bottom:1.2rem}
.team-point{display:flex;align-items:flex-start;gap:1rem;margin-bottom:1.1rem}
.tp-num{font-family:'Noto Serif SC',serif;font-size:1.2rem;font-weight:900;color:var(--gold-deep);opacity:.7;width:40px;flex-shrink:0}
.team-point h4{font-size:1.05rem;color:var(--text);margin-bottom:.2rem}
.team-point p{font-size:.85rem;color:var(--text-2);font-weight:300}

/* === Contact 联系卡片 === */
.contact-card{
  background:var(--surface-2);border:1px solid var(--border);border-radius:16px;padding:1.6rem;text-align:center;margin-bottom:1.2rem;
}
.contact-mascot img{width:70px;height:70px;object-fit:contain;margin:0 auto .6rem}
.contact-label{font-size:.75rem;color:var(--text-3);margin-bottom:.2rem}
.contact-val{font-family:'Noto Serif SC',serif;font-size:1.6rem;color:var(--gold-bright);display:block;margin-bottom:.4rem;letter-spacing:.03em}
.contact-tip{font-size:.78rem;color:var(--text-2);margin-bottom:1rem}
.contact-copy{width:100%;cursor:pointer}
/* 微信二维码卡片 */
.contact-qr-card{
  background:var(--surface-2);border:1px solid var(--border);border-radius:16px;padding:1.6rem;text-align:center;margin-bottom:1.2rem;
}
.contact-qr-img{
  width:200px;height:200px;object-fit:contain;margin:0 auto 1rem;border-radius:12px;background:#fff;padding:8px;
}
.contact-qr-tip{font-size:.85rem;color:var(--text-2);margin-bottom:.4rem}
.contact-qr-id{font-size:.82rem;color:var(--gold-bright)}
/* footer二维码 */
.footer-qr{font-size:.82rem;color:var(--text-2);margin:.6rem 0}
.footer-qr-img{width:120px;height:120px;object-fit:contain;border-radius:10px;background:#fff;padding:6px;margin-top:.4rem}
.contact-phone{
  display:flex;align-items:center;gap:.8rem;background:var(--surface);border:1px solid var(--border-2);
  border-radius:16px;padding:1.1rem 1.4rem;margin-bottom:1.2rem;
}
.contact-phone svg{color:var(--teal);flex-shrink:0}
.contact-phone .contact-label{margin:0}
.contact-phone .contact-val{font-size:1.2rem;margin:0;flex:1;text-align:left}
.join-options-form{display:flex;flex-direction:column;gap:1rem}
.join-options-form .join-form{margin-top:.5rem}

/* === Join === */
#join{position:relative;z-index:1;padding:2rem 0 4rem}
.join-wrap{
  max-width:var(--maxw);margin:0 auto;padding:4rem 2rem;display:grid;grid-template-columns:1fr 1.1fr;gap:3rem;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);backdrop-filter:blur(10px);
}
.join-text .section-tag{margin-bottom:.8rem}
.join-text h2{font-family:'Noto Serif SC',serif;font-weight:900;font-size:clamp(1.6rem,3.5vw,2.2rem);line-height:1.2;margin-bottom:1rem}
.join-text>p{color:var(--text-2);font-weight:300;margin-bottom:1.6rem}
.join-options{display:flex;flex-direction:column;gap:1rem;margin-bottom:1.4rem}
.join-option{display:flex;align-items:center;gap:1rem;background:var(--surface-2);border:1px solid var(--border-2);border-radius:var(--radius-sm);padding:1rem}
.join-option img{width:52px;height:52px;object-fit:cover;border-radius:12px;flex-shrink:0}
.join-option h4{font-size:1rem;color:var(--gold);margin-bottom:.2rem}
.join-option p{font-size:.82rem;color:var(--text-3)}
.join-note{font-size:.78rem;color:var(--text-3);font-style:italic}
.join-form{display:flex;flex-direction:column;gap:.8rem;background:var(--bg-3);padding:2rem;border-radius:var(--radius)}
.join-form h3{font-family:'Noto Serif SC',serif;font-size:1.2rem;margin-bottom:.5rem;color:var(--teal)}
.join-form input,.join-form select,.join-form textarea{
  background:rgba(7,8,20,.6);border:1px solid var(--border-2);border-radius:var(--radius-sm);padding:.8rem 1rem;color:var(--text);font-size:.9rem;transition:border-color .2s;
}
.join-form input:focus,.join-form select:focus,.join-form textarea:focus{outline:none;border-color:var(--gold)}
.join-form textarea{resize:vertical}
.join-form select{appearance:none;cursor:pointer}
.join-submit{width:100%;margin-top:.4rem}

/* === Footer === */
footer{position:relative;z-index:1;border-top:1px solid var(--border-2);padding:3rem 2rem 1.5rem;background:var(--bg-2)}
.footer-inner{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:1.5fr 2fr;gap:3rem;padding-bottom:2rem}
.footer-brand .logo{margin-bottom:1rem}
.footer-brand p{font-size:.85rem;color:var(--text-3);max-width:300px;font-weight:300}
.footer-copy{margin-top:.6rem!important}
.footer-contact{margin-top:1rem;color:var(--text-2)}
.footer-contact p{font-size:.88rem;margin-bottom:.3rem}
.footer-contact strong{color:var(--gold-bright)}
.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.footer-col h4{font-size:.9rem;color:var(--gold);margin-bottom:.8rem;font-weight:700}
.footer-col a{display:block;font-size:.85rem;color:var(--text-3);padding:.25rem 0;transition:color .2s}
.footer-col a:hover{color:var(--text)}

/* === Animations === */
@keyframes fadeUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.fade-in{opacity:0}
.fade-in.visible{animation:fadeUp .7s cubic-bezier(.2,.8,.2,1) forwards}

@media(max-width:900px){
  .nav-links{display:none}.menu-toggle{display:block}
  .hero-mascot img{width:200px}
  .data-banner{grid-template-columns:repeat(2,1fr);gap:1.5rem}
  .ai-wrap,.ark-wrap,.arkie-wrap,.join-wrap,.trend-wrap{grid-template-columns:1fr;gap:2rem}
  .app-gallery{grid-template-columns:repeat(2,1fr)}
  .agents-grid{grid-template-columns:repeat(3,1fr)}
  .gallery-grid,.video-grid{grid-template-columns:repeat(2,1fr)}
  .event-grid{grid-template-columns:1fr}
  .future-inner{padding:1.8rem 1.2rem}
  .footer-inner{grid-template-columns:1fr;gap:2rem}
}
@media(max-width:560px){
  .nav-inner{padding:.6rem 1.2rem}
  #hero{padding:5rem 1.2rem 2rem}
  .hero-mascot img{width:160px}
  .data-banner{grid-template-columns:1fr;gap:1rem;padding:1.5rem}
  .ai-wrap,.ark-wrap,.arkie-wrap{padding:0 1.2rem}
  .arkie-cards{grid-template-columns:1fr;padding:0 1.2rem}
  .app-gallery{grid-template-columns:1fr;padding:0 1.2rem}
  .agents-grid{grid-template-columns:1fr;padding:0 1.2rem}
  .gallery-grid,.video-grid{grid-template-columns:1fr;padding:0 1.2rem}
  .gallery-wrap,.video-wrap,.event-wrap{padding:0 1.2rem}
  .event-grid{grid-template-columns:1fr}
  .phone-frame{max-width:200px}
  .join-wrap,.join-form{padding:2rem 1.2rem;margin:0 1.2rem}
  .footer-links{grid-template-columns:1fr;gap:1.5rem}
  .hero-cta{flex-direction:column;align-items:center}
  .btn-primary,.btn-ghost{width:100%;text-align:center}
  .section-head{padding:4rem 1.2rem 2rem}
}

/* === 阿奇AI智能助手 === */
.ai-section{max-width:var(--maxw);margin:0 auto;padding:0 2rem 2.5rem}
.ai-embed{max-width:860px;margin:0 auto;background:var(--bg-2);border:1px solid var(--border);border-radius:20px;overflow:hidden;display:flex;flex-direction:column}
.ai-embed-header{background:linear-gradient(135deg,var(--purple),var(--purple));padding:1rem 1.2rem;display:flex;align-items:center;gap:.8rem}
.ai-avatar{width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;font-size:1.4rem}
.ai-embed-header strong{font-size:1.05rem}
.ai-embed-header small{opacity:.85;font-size:.72rem}
.ai-online{margin-left:auto;font-size:.72rem;background:rgba(255,255,255,.2);padding:.2rem .7rem;border-radius:20px}
.ai-messages{height:280px;overflow-y:auto;padding:1rem;display:flex;flex-direction:column;gap:.6rem;background:var(--bg)}
.ai-msg{max-width:85%;padding:.6rem .9rem;border-radius:12px;font-size:.88rem;line-height:1.5;white-space:pre-line}
.ai-user{align-self:flex-end;background:var(--purple);color:#fff;border-bottom-right-radius:4px}
.ai-bot{align-self:flex-start;background:rgba(139,108,255,.15);color:var(--text);border-bottom-left-radius:4px}
.ai-input-wrap{display:flex;gap:.5rem;padding:.8rem;border-top:1px solid var(--border);background:var(--bg-2)}
#aiInputEmbed{flex:1;background:var(--bg);border:1px solid var(--border-2);border-radius:20px;padding:.65rem 1rem;color:var(--text);font-size:.9rem}
#aiInputEmbed:focus{outline:none;border-color:var(--purple)}
.ai-send{background:linear-gradient(135deg,var(--purple),#8b6cff);color:#fff;border:none;border-radius:20px;padding:.65rem 1.2rem;cursor:pointer;font-weight:600}
.ai-send:hover{opacity:.9}
@media(max-width:600px){.ai-section{padding:0 1.2rem 2rem}.ai-messages{height:240px}}