/* STEM Racing V3 — QuadCore Racing
   品牌色：蓝 #66CCFF · 青绿 #c2ec3b · 白 #FFFFFF
   黑色底 + 品牌色点缀 */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;1,300&family=Inter:wght@200;300;400;500&display=swap');
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --paper:#000000;          /* 主背景：黑 */
  --paper-2:#0d1114;        /* 卡片 / 次级底 */
  --ink:#f2f7fa;            /* 主文字 */
  --dim:rgba(242,247,250,.62);
  --line:rgba(242,247,250,.16);
  --blue:#66ccff;           /* 品牌蓝 */
  --blue-deep:#66ccff;
  --blue-soft:rgba(102,204,255,.12);
  --lime:#c2ec3b;           /* 品牌青绿 */
  --lime-deep:#c2ec3b;
  --lime-soft:rgba(194,236,59,.12);
  --serif:'Cormorant Garamond','Songti SC','STSong','SimSun',serif;
  --sans:'Inter','Microsoft YaHei',system-ui,sans-serif;
}
html,body{min-height:100%;background:var(--paper);color:var(--ink);font-family:var(--sans);font-weight:300;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* ── 背景：黑底 + 两团极淡的品牌色光晕 ── */
.bg{position:fixed;inset:0;z-index:-2;
  background:
    radial-gradient(820px 560px at 6% -8%,rgba(102,204,255,.16),transparent 62%),
    radial-gradient(700px 520px at 98% 6%,rgba(194,236,59,.11),transparent 60%),
    radial-gradient(900px 640px at 58% 112%,rgba(102,204,255,.09),transparent 66%),
    #000000}
.grain{position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='.9'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}

/* ── 顶栏（内页） ── */
.top{position:fixed;top:0;left:0;right:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:20px 40px;
  background:linear-gradient(rgba(0,0,0,.94),rgba(0,0,0,.70) 62%,rgba(0,0,0,0));
  backdrop-filter:blur(12px) saturate(130%);-webkit-backdrop-filter:blur(12px) saturate(130%)}
.brand{font-family:var(--serif);font-size:22px;letter-spacing:.01em;color:var(--ink)}
.brand:hover{color:var(--blue)}
.links{display:flex;align-items:center;gap:26px;font-size:11px;letter-spacing:.2em;text-transform:uppercase}
.links a{color:var(--dim);transition:color .3s;position:relative;padding-bottom:3px}
.links a::after{content:'';position:absolute;left:0;right:0;bottom:0;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--blue),var(--lime));transform:scaleX(0);transition:transform .3s}
.links a:hover{color:var(--ink)}
.links a:hover::after,.links a.on::after{transform:scaleX(1)}
.links a.on{color:var(--ink)}
.lang{border:1px solid var(--line);padding:5px 11px;font-size:10px;letter-spacing:.18em;cursor:pointer;
  background:rgba(255,255,255,.05);color:var(--dim);margin-left:6px;border-radius:999px;transition:.25s}
.lang:hover{color:var(--ink);border-color:var(--blue);box-shadow:0 0 0 3px rgba(102,204,255,.16)}
.menu{display:none;background:none;border:0;color:var(--ink);font-size:11px;letter-spacing:.2em;cursor:pointer}

/* ── 首页 ── */
.splash{min-height:100vh;display:grid;grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);align-items:center;
  gap:clamp(24px,5vw,84px);padding:104px clamp(26px,6vw,104px) 140px;max-width:1600px;margin:0 auto}
/* Logo 是白色笔画，黑底上直接清楚 */
.splash .logo-big{display:flex;align-items:center;justify-content:center;position:relative}
.splash .logo-big img{width:min(100%,540px);height:auto;
  filter:drop-shadow(0 0 42px rgba(102,204,255,.24)) drop-shadow(0 12px 30px rgba(0,0,0,.6))}
.wordme{max-width:620px}
.title{font-family:var(--serif);font-weight:300;font-size:clamp(48px,7.4vw,108px);line-height:.98;letter-spacing:-.01em}
.title i{font-style:normal;background:linear-gradient(100deg,var(--blue),var(--lime));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.nav-under{margin-top:clamp(20px,3vw,34px);display:flex;flex-wrap:wrap;align-items:center;gap:8px 26px;font-size:clamp(13px,1.25vw,17px)}
.nav-under a{color:var(--dim);transition:color .3s;position:relative;padding-bottom:3px}
.nav-under a::after{content:'';position:absolute;left:0;right:0;bottom:0;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--blue),var(--lime));transform:scaleX(0);transform-origin:left;transition:transform .35s}
.nav-under a:hover{color:var(--ink)}
.nav-under a:hover::after{transform:scaleX(1)}
.nav-under .lang{margin:0}

/* 四角 */
.corner{position:fixed;z-index:15}
.corner.bl{bottom:28px;left:40px}
.socials{margin:0;display:flex;gap:12px;list-style:none;align-items:center}
.socials a{color:var(--ink);opacity:.7;transition:.3s;display:flex;width:32px;height:32px;align-items:center;justify-content:center;
  background:rgba(255,255,255,.05);border:1px solid var(--line);border-radius:50%}
.socials a:hover{opacity:1;transform:translateY(-2px);border-color:var(--blue);color:var(--blue);box-shadow:0 6px 18px -8px rgba(102,204,255,.65)}
.socials svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.6}
.mail{display:inline-block;margin-top:14px;font-size:10px;letter-spacing:.14em;color:var(--dim);
  border-bottom:1px solid var(--line);padding-bottom:3px}
.mail:hover{color:var(--blue);border-color:var(--blue)}
.home .foot{position:fixed;bottom:0;left:0;right:0;padding-bottom:18px}

/* ── 内页 ── */
.page{max-width:1080px;margin:0 auto;padding:146px 32px 96px}
.kicker{font-size:11px;letter-spacing:.28em;text-transform:uppercase;color:var(--blue);display:inline-flex;align-items:center;gap:9px}
.kicker::before{content:'';width:22px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--blue),var(--lime))}
.h{font-family:var(--serif);font-weight:300;font-size:clamp(44px,6.6vw,86px);line-height:1.02;margin:14px 0 34px}
.h i{font-style:italic;color:var(--blue)}
.lead{font-family:var(--serif);font-size:clamp(19px,2.2vw,27px);line-height:1.5;max-width:760px}
.body{font-size:15px;line-height:1.95;color:var(--dim);max-width:720px;margin-top:22px}
.body strong{color:var(--ink);font-weight:500}
.body a{border-bottom:1px solid var(--line);color:var(--ink)}
.body a:hover{color:var(--blue);border-color:var(--blue)}
.rule{height:1px;margin:54px 0;background:linear-gradient(90deg,var(--blue) 0%,rgba(102,204,255,.30) 26%,var(--line) 60%,transparent 100%)}
.ph{color:var(--blue)}
.more{display:inline-block;margin-top:34px;font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  border-bottom:2px solid var(--lime);padding-bottom:4px;transition:.3s}
.more:hover{color:var(--blue);border-color:var(--blue)}

.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin-top:20px}
.stats b{display:block;font-family:var(--serif);font-weight:300;font-size:clamp(38px,4.6vw,60px);color:var(--ink)}
.stats span{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--dim)}

.list{list-style:none;border-top:1px solid var(--line)}
.list li{display:grid;grid-template-columns:150px 1fr;gap:22px;padding:20px 0;border-bottom:1px solid var(--line);transition:background .3s}
.list li:hover{background:linear-gradient(90deg,rgba(102,204,255,.10),transparent 70%)}
.list li b{font-family:var(--serif);font-size:21px;font-weight:300;font-style:italic;color:var(--blue)}
.list li span{color:var(--dim);line-height:1.8}

.cols{display:grid;grid-template-columns:repeat(3,1fr);gap:34px;margin-top:8px}
.cols h3{font-family:var(--serif);font-weight:300;font-size:25px;margin-bottom:10px}
.cols h3::after{content:'';display:block;width:26px;height:2px;margin-top:8px;border-radius:2px;
  background:linear-gradient(90deg,var(--blue),var(--lime))}
.cols p{color:var(--dim);line-height:1.85;font-size:14px}

/* 关于页两段总述 */
.two-col-text{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,60px);margin-top:6px}
.two-col-text p{font-size:15px;line-height:2;color:var(--dim)}

/* 大图横条（图片与下方标题各占各位，不重叠） */
figure.shot.hero-shot{margin:0 0 44px;aspect-ratio:16/7}
figure.shot.hero-shot img{object-position:center 35%}
.headline{position:relative}
.headline .h{margin-bottom:18px}

/* 大号要点列表 */
.facts{list-style:none;border-top:1px solid var(--line);margin-top:6px}
.facts li{display:grid;grid-template-columns:88px 1fr;align-items:baseline;gap:18px;padding:24px 0;border-bottom:1px solid var(--line)}
.facts b{font-size:12px;font-weight:500;letter-spacing:.14em;color:#0a1210;
  background:var(--lime);border-radius:999px;padding:5px 10px;justify-self:start}
.facts span{font-family:var(--serif);font-size:clamp(19px,2.1vw,27px);line-height:1.35;color:var(--ink)}

/* 联系页信息条 */
.contact-list{border-top:1px solid var(--line);margin-top:8px}
.cline{display:grid;grid-template-columns:120px 1fr;gap:20px;align-items:baseline;padding:24px 0;border-bottom:1px solid var(--line);transition:.3s}
a.cline:hover{background:linear-gradient(90deg,rgba(102,204,255,.12),transparent 72%)}
a.cline:hover .cl-v{color:var(--blue)}
.cl-k{font-size:10px;letter-spacing:.26em;text-transform:uppercase;color:var(--dim)}
.cl-v{font-family:var(--serif);font-size:clamp(17px,1.9vw,24px);color:var(--ink);transition:color .3s}

/* 进入网站前的同意弹层 */
.consent{position:fixed;inset:0;z-index:200;background:rgba(0,0,0,.80);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  display:flex;align-items:center;justify-content:center;padding:24px;animation:fadeIn .5s ease both}
.consent.out{animation:fadeOut .4s ease both}
.consent-box{width:min(620px,100%);max-height:min(86vh,780px);display:flex;flex-direction:column;position:relative;
  background:#0b0e10;border:1px solid rgba(242,247,250,.14);border-radius:20px;padding:30px 30px 22px;
  box-shadow:0 40px 90px -30px rgba(0,0,0,.95)}
.consent-box::before{content:'';position:absolute;inset:0 0 auto;height:3px;border-radius:20px 20px 0 0;
  background:linear-gradient(90deg,var(--blue),var(--lime))}
.consent-lang{position:absolute;top:22px;right:24px;margin:0;padding:5px 11px;font-size:10px;letter-spacing:.18em;
  background:rgba(255,255,255,.05);border:1px solid var(--line);color:var(--dim);cursor:pointer;border-radius:999px;transition:.25s}
.consent-lang:hover{color:var(--ink);border-color:var(--blue)}
.consent-kicker{font-size:10px;letter-spacing:.3em;text-transform:uppercase;color:var(--lime);margin-bottom:8px}
.consent-box h2{font-family:var(--serif);font-weight:300;font-size:clamp(22px,3vw,30px);line-height:1.2;margin-bottom:16px}
.consent-scroll{overflow-y:auto;padding-right:12px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  scrollbar-width:thin;scrollbar-color:rgba(102,204,255,.4) transparent}
.consent-scroll::-webkit-scrollbar{width:5px}
.consent-scroll::-webkit-scrollbar-thumb{background:rgba(102,204,255,.4);border-radius:3px}
.consent-scroll h3{font-family:var(--serif);font-weight:400;font-size:16px;color:var(--ink);margin:18px 0 6px}
.consent-scroll p{font-size:13px;line-height:1.95;color:var(--dim);margin-bottom:10px}
.consent-scroll strong{color:var(--ink);font-weight:500}
.consent-scroll a{border-bottom:1px solid var(--line);color:var(--blue)}
.consent-scroll a:hover{border-color:var(--blue)}
.consent-scroll code{font-family:ui-monospace,Consolas,monospace;font-size:11px;color:var(--blue);background:rgba(102,204,255,.12);padding:1px 5px;border-radius:4px}
.consent-end{text-align:center;font-size:10px;letter-spacing:.3em;color:rgba(242,247,250,.32);margin:18px 0 6px}
.consent-foot{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:18px;flex-wrap:wrap}
.consent-link{font-size:11px;letter-spacing:.16em;color:var(--dim);border-bottom:1px solid var(--line);padding-bottom:3px}
.consent-link:hover{color:var(--blue);border-color:var(--blue)}
.consent-btn{padding:13px 34px;border-radius:999px;border:0;cursor:pointer;font-size:12px;letter-spacing:.18em;font-weight:500;
  background:linear-gradient(100deg,var(--blue) 0%,#9fe3ff 42%,var(--lime) 100%);color:#06141c;
  box-shadow:0 12px 30px -14px rgba(102,204,255,.75);transition:opacity .3s,transform .2s,box-shadow .3s}
.consent-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 16px 34px -14px rgba(194,236,59,.7)}
.consent-btn:disabled{opacity:.3;cursor:not-allowed;filter:grayscale(.5)}
.consent-hint{margin-top:10px;font-size:10px;letter-spacing:.14em;color:rgba(242,247,250,.42);transition:opacity .3s}

/* 隐私政策长文页 */
.legal{border-top:1px solid var(--line)}
.legal section{padding:28px 0;border-bottom:1px solid var(--line)}
.legal h2{font-family:var(--serif);font-weight:300;font-size:clamp(20px,2.2vw,28px);margin-bottom:14px;color:var(--ink)}
.legal p{font-size:14px;line-height:2;color:var(--dim);margin-bottom:14px}
.legal p:last-child{margin-bottom:0}
.legal strong{color:var(--ink);font-weight:500}
.legal a{border-bottom:1px solid var(--line);color:var(--ink)}
.legal a:hover{color:var(--blue);border-color:var(--blue)}
.legal code{font-family:ui-monospace,Consolas,monospace;font-size:12px;color:var(--blue);background:rgba(102,204,255,.12);padding:1px 6px;border-radius:4px}

/* 图文两栏 */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(24px,4vw,64px);align-items:center;margin-top:10px}
.split.flip{grid-template-columns:.95fr 1.05fr}
.split.flip figure{order:2}
.split ul{margin-top:8px}

/* 图片框 */
figure.shot{margin:0;position:relative;border-radius:18px;overflow:hidden;background:var(--paper-2);
  border:1px solid rgba(242,247,250,.12);
  box-shadow:0 24px 54px -26px rgba(0,0,0,.9)}
figure.shot img{width:100%;height:100%;object-fit:cover;display:block}
figure.shot::before{content:'';position:absolute;inset:0;pointer-events:none;z-index:2;border-radius:inherit;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.10)}
figure.shot figcaption{position:absolute;left:0;right:0;bottom:0;padding:18px 20px 14px;font-size:10px;
  letter-spacing:.24em;text-transform:uppercase;color:#ffffff;z-index:3;
  background:linear-gradient(to top,rgba(0,0,0,.88),rgba(0,0,0,.30) 55%,transparent)}

/* 图片横条 */
.strip{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:8px}
.strip.two{grid-template-columns:repeat(2,1fr)}
.strip figure.shot{aspect-ratio:4/3}

/* 队伍成员 */
.crew{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.crew article{position:relative}
.crew .ph-img{position:relative;aspect-ratio:4/5;border-radius:18px;overflow:hidden;
  background:var(--paper-2);display:flex;align-items:center;justify-content:center;
  font-size:10px;letter-spacing:.3em;color:var(--dim);
  box-shadow:0 22px 48px -24px rgba(0,0,0,.95);
  transition:transform .5s ease,box-shadow .5s ease}
.crew .ph-img img{width:100%;height:100%;object-fit:cover;object-position:center top;display:block;transition:transform .7s ease}
/* 下半部：白到透明的薄雾，鼠标移上淡出 */
.crew .ph-img::after{content:'';position:absolute;left:0;right:0;bottom:0;height:46%;pointer-events:none;z-index:2;
  background:linear-gradient(to top,
    rgba(255,255,255,.34) 0%,
    rgba(255,255,255,.20) 34%,
    rgba(255,255,255,.08) 66%,
    rgba(255,255,255,0) 100%);
  transition:opacity .5s ease;opacity:1}
.crew article:hover .ph-img::after{opacity:0}
.crew article:hover .ph-img{transform:translateY(-6px);
  box-shadow:0 30px 58px -24px rgba(0,0,0,.95),0 0 0 2px rgba(102,204,255,.6),0 0 30px -6px rgba(194,236,59,.45)}
.crew article:hover .ph-img img{transform:scale(1.04)}
.crew h3{font-family:var(--serif);font-weight:300;font-size:22px;margin-top:16px}
.crew .role{font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--dim);margin-top:6px}
.crew .bio{font-size:13px;line-height:1.75;color:var(--dim);margin-top:10px}

/* 赞助商 Logo 格 */
.logos{display:grid;gap:16px;margin-top:6px}
.logos.p1{grid-template-columns:repeat(2,1fr)}.logos.p2{grid-template-columns:repeat(3,1fr)}.logos.p3{grid-template-columns:repeat(4,1fr)}
.logos a{border:1px solid var(--line);border-radius:16px;background:rgba(255,255,255,.04);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
  color:var(--dim);font-size:10px;letter-spacing:.28em;transition:.3s}
.logos.p1 a{height:170px}.logos.p2 a{height:125px}.logos.p3 a{height:88px}
.logos a:hover{border-color:var(--blue);color:var(--blue);box-shadow:0 14px 34px -18px rgba(102,204,255,.6);transform:translateY(-3px)}
.logos a em{font-family:var(--serif);font-style:italic;font-size:17px;letter-spacing:0;text-transform:none}

/* 表单（备用） */
.form{display:grid;gap:26px;max-width:620px;margin-top:40px}
.form label{font-size:10px;letter-spacing:.26em;text-transform:uppercase;color:var(--dim)}
.form input,.form textarea{width:100%;background:none;border:0;border-bottom:1px solid var(--line);color:var(--ink);font:300 16px var(--sans);padding:10px 0;outline:none;resize:vertical}
.form input:focus,.form textarea:focus{border-color:var(--blue)}
.form button{justify-self:start;background:linear-gradient(100deg,var(--blue),var(--lime));border:0;color:#06141c;
  padding:13px 38px;font-size:11px;letter-spacing:.24em;text-transform:uppercase;cursor:pointer;border-radius:999px;font-weight:500}
.fmsg{font-family:var(--serif);font-style:italic;color:var(--dim);min-height:1em}

/* 页脚 */
.foot{text-align:center;padding:30px 20px;font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim)}
.foot ul{list-style:none;display:flex;justify-content:center;gap:18px;margin-top:8px;flex-wrap:wrap}
.foot a:hover{color:var(--blue)}

/* 页面切换 */
body{animation:fadeIn .7s ease both}
body.leaving{animation:fadeOut .4s ease both}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes fadeOut{to{opacity:0}}
.rv{opacity:0;transform:translateY(20px);transition:opacity .9s,transform .9s}
.rv.show{opacity:1;transform:none}

@media(max-width:900px){
  .splash{grid-template-columns:1fr;padding:96px 24px 150px;text-align:center;gap:26px}
  .splash .logo-big img{width:min(64vw,260px)}
  .wordme{margin:0 auto}
  .nav-under{justify-content:center}
 .corner.bl{position:static;left:auto;bottom:auto;padding:0 24px 6px;text-align:center}
  .home .foot{position:static;padding-bottom:26px}
  .links{display:none;position:fixed;inset:62px 0 auto;flex-direction:column;align-items:center;gap:18px;padding:26px;
    background:rgba(0,0,0,.98);box-shadow:0 20px 40px -24px rgba(0,0,0,.9)}
  .links.open{display:flex}.menu{display:block}
  .stats,.cols,.logos.p1,.logos.p2,.two-col-text{grid-template-columns:1fr}
  .crew,.logos.p3{grid-template-columns:repeat(2,1fr)}
  .list li{grid-template-columns:1fr;gap:6px}
  .top{padding:14px 18px}
  .page{padding:116px 20px 76px}
  .split,.split.flip{grid-template-columns:1fr}
  .split.flip figure{order:0}
  .strip,.strip.two{grid-template-columns:1fr}
  .facts li{grid-template-columns:56px 1fr;gap:12px;padding:18px 0}
  .cline{grid-template-columns:1fr;gap:6px}
}

/* 队服图：抠掉白底后直接浮在黑底上 */
figure.shot.shirt{background:none;border:0;box-shadow:none;overflow:visible;
  display:flex;flex-direction:column;align-items:center;justify-content:flex-end;aspect-ratio:auto}
figure.shot.shirt img{width:auto;height:auto;max-width:100%;max-height:min(56vh,520px);object-fit:contain;
  filter:drop-shadow(0 22px 44px rgba(0,0,0,.75))}
figure.shot.shirt::before{display:none}
figure.shot.shirt figcaption{position:static;background:none;padding:16px 0 0;color:var(--dim);
  font-size:10px;letter-spacing:.24em}

/* 赞助商 LOGO 滚动墙（无缝循环，鼠标悬停暂停） */
.marquee{position:relative;margin-top:26px;overflow:hidden;padding:6px 0;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}
.marquee-track{display:flex;gap:18px;width:max-content;
  animation:logos-scroll 26s linear infinite;will-change:transform}
.marquee:hover .marquee-track{animation-play-state:paused}
@keyframes logos-scroll{from{transform:translateX(0)}to{transform:translateX(-50%)}}
.logo-slot{flex:0 0 auto;width:200px;height:110px;border-radius:14px;
  background:rgba(255,255,255,.94);border:1px solid rgba(255,255,255,.16);
  display:flex;align-items:center;justify-content:center;
  transition:transform .35s ease,box-shadow .35s ease}
.logo-slot em{font-family:var(--serif);font-style:italic;font-size:20px;letter-spacing:.02em;
  color:rgba(16,40,60,.42)}
.logo-slot img{max-width:76%;max-height:64%;object-fit:contain}
.logo-slot:hover{transform:translateY(-4px);box-shadow:0 18px 40px -20px rgba(102,204,255,.75)}
@media(max-width:900px){.logo-slot{width:150px;height:88px}}
@media(prefers-reduced-motion:reduce){.marquee-track{animation:none}}

/* 合作伙伴页：大号 LOGO 滚动墙 */
.marquee.big{margin:10px 0 4px}
.marquee.big .marquee-track{gap:26px;animation-duration:34s}
.marquee.big .logo-slot{width:300px;height:170px;border-radius:20px}
.marquee.big .logo-slot em{font-size:26px}
@media(max-width:900px){
  .marquee.big .marquee-track{gap:16px}
  .marquee.big .logo-slot{width:200px;height:120px;border-radius:16px}
  .marquee.big .logo-slot em{font-size:20px}
}

/* 开场动画：黑屏中央 Logo，再交叉淡入首页（只用 opacity/transform，保证流畅） */
.intro{position:fixed;inset:0;z-index:300;background:#000;
  display:flex;align-items:center;justify-content:center;
  transition:opacity .85s cubic-bezier(.33,0,.2,1);
  will-change:opacity;transform:translateZ(0)}
.intro.out{opacity:0}
.intro img{width:min(46vw,360px);height:auto;opacity:0;transform:scale(.94);
  animation:introLogo .72s cubic-bezier(.16,.84,.24,1) forwards;
  transition:opacity .3s ease;will-change:opacity,transform}
.intro.fading img{opacity:0}
.intro.calm img{animation:introCalm .6s ease forwards;transform:none}
.intro.calm.fading img{opacity:0}
@keyframes introLogo{
  0%{opacity:0;transform:scale(.94)}
  50%{opacity:1}
  100%{opacity:1;transform:scale(1)}}
@keyframes introCalm{from{opacity:0}to{opacity:1}}
body.intro-lock{overflow:hidden}
/* 首页内容与黑幕交叉淡入 */
.splash,.corner{transition:opacity .8s ease;will-change:opacity}
body.intro-lock .splash,body.intro-lock .corner{opacity:0}
@media(max-width:900px){.intro img{width:min(62vw,260px)}}

/* 手机端：社媒与邮箱改为正常排版，居中排在页脚上方，绝不重叠 */
@media(max-width:900px){
  .corner.bl{position:static;left:auto;bottom:auto;padding:0 24px 4px;text-align:center;
    display:flex;flex-direction:column;align-items:center;gap:12px}
  .socials{justify-content:center;gap:14px}
  .mail{margin-top:0;text-align:center}
  .home .foot{position:static;padding:14px 20px 28px}
  .home .foot ul{gap:14px}
  .splash{min-height:auto;padding-bottom:20px}
}