/* huichutan.com — binance 安全入口 · 沉浸式全屏布局（站点样式）
   首屏与分节全部 100vh 满屏大图；导航完全隐藏，只留右上角一个浮动按钮，点开是全屏覆盖菜单
   深墨蓝黑 + 荧光绿；内容区反向做满宽（1320px）最大化展示空间
   与已建七站区隔：黑金 / 亮蓝 / 靛蓝 / 纯白极简 / 紫粉霓虹 / 燕麦陶土 / 冷白电光青 —— 本套是深墨荧绿 */
:root{
  --bg:#060a12; --bg2:#0a1018; --card:#0d141e; --card2:#111a26;
  --ink:#eef2f8; --ink2:#a8b4c4; --mt:#6b7787; --mt2:#4d5766;
  --gr:#3ddc84; --gr2:#2bb96a; --gr-ink:#04140b;
  --line:rgba(255,255,255,.10); --line2:rgba(255,255,255,.18);
  --wide:1320px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  font-size:15px;line-height:1.85;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--wide);margin:0 auto;padding:0 32px;width:100%}

/* ============ 隐藏式导航：右上角浮动按钮 + 全屏覆盖菜单 ============ */
.hbtn{position:fixed;right:26px;top:22px;z-index:120;width:52px;height:52px;border-radius:50%;
  background:rgba(6,10,18,.62);backdrop-filter:blur(14px);border:1px solid var(--line2);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;transition:.25s}
.hbtn:hover{border-color:var(--gr);background:rgba(6,10,18,.85)}
.hbtn i{display:block;width:19px;height:2px;background:var(--ink);border-radius:2px;transition:.28s}
.hbtn.x i:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hbtn.x i:nth-child(2){opacity:0}
.hbtn.x i:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.hbtn .dot{position:absolute;right:11px;top:11px;width:7px;height:7px;border-radius:50%;background:var(--gr);
  box-shadow:0 0 10px 2px rgba(61,220,132,.7)}
.omenu{position:fixed;inset:0;z-index:110;background:rgba(6,10,18,.97);backdrop-filter:blur(20px);
  display:flex;align-items:center;opacity:0;visibility:hidden;transition:opacity .35s,visibility .35s}
.omenu.open{opacity:1;visibility:visible}
.omenu .in{width:100%;max-width:var(--wide);margin:0 auto;padding:0 32px;
  display:grid;grid-template-columns:1.35fr .65fr;gap:60px;align-items:center}
.omenu nav a{display:block;font-size:44px;font-weight:800;letter-spacing:-.035em;line-height:1.42;
  color:var(--ink2);transition:.2s;transform:translateY(14px);opacity:0}
.omenu.open nav a{transform:none;opacity:1}
.omenu.open nav a:nth-child(1){transition:transform .4s .06s,opacity .4s .06s,color .2s}
.omenu.open nav a:nth-child(2){transition:transform .4s .12s,opacity .4s .12s,color .2s}
.omenu.open nav a:nth-child(3){transition:transform .4s .18s,opacity .4s .18s,color .2s}
.omenu.open nav a:nth-child(4){transition:transform .4s .24s,opacity .4s .24s,color .2s}
.omenu.open nav a:nth-child(5){transition:transform .4s .30s,opacity .4s .30s,color .2s}
.omenu nav a:hover,.omenu nav a.on{color:var(--gr)}
.omenu nav a em{font-style:normal;font-size:13px;color:var(--mt2);letter-spacing:.2em;margin-right:18px;vertical-align:middle}
.omenu .side{border-left:1px solid var(--line);padding-left:40px}
.omenu .side p{font-size:13px;color:var(--mt);line-height:2;margin-bottom:22px}
.omenu .side .row{display:flex;gap:12px;flex-wrap:wrap}
.btn-g{display:inline-block;background:var(--gr);color:var(--gr-ink);font-weight:800;font-size:13.5px;padding:13px 26px;
  border-radius:999px;transition:.2s}
.btn-g:hover{background:#5ee99b}
.btn-o{display:inline-block;border:1px solid var(--line2);color:var(--ink2);font-size:13.5px;padding:12px 24px;border-radius:999px;transition:.2s}
.btn-o:hover{border-color:var(--gr);color:var(--gr)}

/* ============ 首屏：100vh 满屏大图 ============ */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;
  text-align:center;background:#04070c center/cover no-repeat;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(6,10,18,.88) 0%,rgba(6,10,18,.66) 42%,rgba(6,10,18,.96) 100%)}
.hero::after{content:"";position:absolute;inset:0;
  background:radial-gradient(56% 44% at 50% 46%,rgba(6,10,18,.88) 0%,rgba(6,10,18,.44) 62%,transparent 80%)}
.hero .c{position:relative;z-index:3;padding:120px 32px 90px;max-width:900px}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:11.5px;font-weight:700;letter-spacing:.26em;
  text-transform:uppercase;color:var(--gr);border:1px solid rgba(61,220,132,.36);background:rgba(61,220,132,.07);
  padding:7px 18px;border-radius:999px;margin-bottom:30px}
.eyebrow b{width:6px;height:6px;border-radius:50%;background:var(--gr);box-shadow:0 0 10px 2px rgba(61,220,132,.85);animation:bl 2.2s ease-in-out infinite}
@keyframes bl{0%,100%{opacity:1}50%{opacity:.32}}
.hero h1{font-size:74px;line-height:1.08;font-weight:800;letter-spacing:-.045em;margin-bottom:26px}
.hero h1 .g{color:var(--gr)}
.hero .sub{font-size:16px;color:var(--ink2);line-height:2.05;max-width:680px;margin:0 auto 38px}
.hero .btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero .scroll{position:absolute;left:50%;bottom:34px;transform:translateX(-50%);z-index:3;
  display:flex;flex-direction:column;align-items:center;gap:10px;font-size:11px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--mt2)}
.hero .scroll i{display:block;width:1px;height:44px;background:linear-gradient(180deg,var(--gr),transparent);
  animation:dn 2s ease-in-out infinite}
@keyframes dn{0%,100%{opacity:.3;transform:scaleY(.6)}50%{opacity:1;transform:scaleY(1)}}

/* ============ 全屏分节（3 节，图文交替）============ */
.sect{position:relative;min-height:100vh;display:flex;align-items:center;background:#04070c center/cover no-repeat;overflow:hidden}
.sect::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,10,18,.94) 0%,rgba(6,10,18,.74) 52%,rgba(6,10,18,.42) 100%)}
.sect.r::before{background:linear-gradient(270deg,rgba(6,10,18,.94) 0%,rgba(6,10,18,.74) 52%,rgba(6,10,18,.42) 100%)}
.sect .wrap{position:relative;z-index:3;display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;padding-top:80px;padding-bottom:80px}
.sect.r .wrap{direction:rtl}
.sect.r .wrap > *{direction:ltr}
.sect .no{font-size:12px;font-weight:800;letter-spacing:.3em;color:var(--gr);margin-bottom:22px}
.sect h2{font-size:46px;line-height:1.2;font-weight:800;letter-spacing:-.035em;margin-bottom:22px}
.sect p{font-size:15px;color:var(--ink2);line-height:2.05;max-width:520px;margin-bottom:16px}
.sect ul{list-style:none;margin-top:22px}
.sect li{font-size:13.5px;color:var(--ink2);padding-left:24px;position:relative;margin-bottom:11px;line-height:1.85}
.sect li::before{content:"";position:absolute;left:0;top:9px;width:8px;height:8px;border-radius:2px;background:var(--gr);transform:rotate(45deg)}
.sect .fig{border:1px solid var(--line2);border-radius:14px;overflow:hidden;background:rgba(13,20,30,.5);backdrop-filter:blur(8px)}
.sect .fig img{width:100%;height:300px;object-fit:cover}
.sect .fig .cap{padding:16px 20px;font-size:12.5px;color:var(--mt);border-top:1px solid var(--line)}

/* ============ 内容区：反向做满宽 ============ */
.band{background:var(--bg2);border-top:1px solid var(--line);padding:96px 0}
.bh{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;padding-bottom:18px;
  border-bottom:1px solid var(--line2);margin-bottom:38px}
.bh h2{font-size:34px;font-weight:800;letter-spacing:-.03em}
.bh p{font-size:13.5px;color:var(--mt);margin-top:10px;max-width:640px}
.bh a{font-size:13px;font-weight:700;color:var(--gr);white-space:nowrap}
.bh a:hover{color:#5ee99b}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.gc{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:.24s;display:flex;flex-direction:column}
.gc:hover{transform:translateY(-4px);border-color:rgba(61,220,132,.42);box-shadow:0 18px 40px rgba(0,0,0,.55)}
.gc .thumb{height:132px;background:var(--card2);overflow:hidden}
.gc .thumb img{width:100%;height:132px;object-fit:cover}
.gc .bd{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1}
.gc .cat{display:inline-block;font-size:10.5px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;
  color:var(--gr);border:1px solid rgba(61,220,132,.32);background:rgba(61,220,132,.08);padding:2px 9px;border-radius:4px;margin-bottom:11px;align-self:flex-start}
.gc h3{font-size:15px;font-weight:700;line-height:1.5;margin-bottom:8px}
.gc:hover h3{color:var(--gr)}
.gc p{font-size:12.5px;color:var(--mt);line-height:1.8;margin-bottom:14px}
.gc .mt{margin-top:auto;font-size:11.5px;color:var(--mt2);display:flex;gap:12px}

/* ============ 信任条 ============ */
.trust{background:var(--bg);border-top:1px solid var(--line);padding:78px 0}
.trust .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.tc{border-left:2px solid var(--gr);padding-left:18px}
.tc b{display:block;font-size:15.5px;font-weight:800;margin-bottom:8px}
.tc p{font-size:12.5px;color:var(--mt);line-height:1.8}

/* ============ CTA ============ */
.cta{position:relative;padding:120px 0;text-align:center;overflow:hidden;background:center/cover no-repeat}
.cta::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,10,18,.90),rgba(6,10,18,.96))}
.cta .wrap{position:relative;z-index:3}
.cta h2{font-size:42px;font-weight:800;letter-spacing:-.035em;line-height:1.22;margin-bottom:16px}
.cta p{font-size:14px;color:var(--mt);margin-bottom:34px}
.cta .btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ============ 页脚 ============ */
footer{background:#04070c;border-top:1px solid var(--line);padding:56px 0 46px}
.fg{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr 1fr;gap:24px;padding-bottom:32px}
.fg h4{font-size:12.5px;font-weight:800;margin-bottom:14px}
.fg a{display:block;font-size:12.5px;color:var(--mt);padding:4px 0;transition:.16s}
.fg a:hover{color:var(--gr)}
.fg .fb .lg{display:flex;align-items:center;gap:10px;font-size:16.5px;font-weight:800}
.fg .fb .mk{width:30px;height:30px;border-radius:9px;background:var(--gr);color:var(--gr-ink);display:flex;
  align-items:center;justify-content:center;font-weight:900;font-size:15px}
.fg .fb em{font-style:normal;font-size:11.5px;color:var(--mt);letter-spacing:.14em}
.fg .fb p{font-size:12.5px;color:var(--mt);line-height:1.9;margin-top:14px;max-width:300px}
.fbar{border-top:1px solid var(--line);padding-top:20px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12px;color:var(--mt2)}

/* ============================================================
   L1 栏目页
   ============================================================ */
.phero{position:relative;min-height:62vh;display:flex;align-items:flex-end;background:#04070c center/cover no-repeat}
.phero::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,10,18,.72),rgba(6,10,18,.96))}
.phero .wrap{position:relative;z-index:3;padding-bottom:56px;padding-top:150px}
.phero h1{font-size:52px;font-weight:800;letter-spacing:-.04em;margin:20px 0 16px}
.phero p{font-size:14.5px;color:var(--ink2);max-width:720px;line-height:2}
.plist{background:var(--bg2);padding:0 0 96px}
.prow{display:grid;grid-template-columns:300px 1fr;gap:32px;align-items:center;padding:26px 0;
  border-bottom:1px solid var(--line);transition:.22s}
.prow:hover{background:rgba(61,220,132,.04);padding-left:14px}
.prow .th{height:170px;border-radius:10px;overflow:hidden;background:var(--card2)}
.prow .th img{width:100%;height:170px;object-fit:cover}
.prow h3{font-size:20px;font-weight:700;line-height:1.5;margin-bottom:9px}
.prow:hover h3{color:var(--gr)}
.prow p{font-size:13.5px;color:var(--mt);line-height:1.9}
.prow .mt{margin-top:12px;font-size:11.5px;color:var(--mt2);display:flex;gap:14px}
.pager{display:flex;gap:10px;padding-top:34px}
.pager a{min-width:40px;height:40px;line-height:38px;text-align:center;border:1px solid var(--line2);
  border-radius:10px;font-size:13px;color:var(--ink2);padding:0 13px}
.pager a:hover{border-color:var(--gr);color:var(--gr)}
.pager a.cur{background:var(--gr);border-color:var(--gr);color:var(--gr-ink);font-weight:800}

/* ============================================================
   L2 详情页
   ============================================================ */
.ahero{position:relative;min-height:70vh;display:flex;align-items:flex-end;background:#04070c center/cover no-repeat}
.ahero::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,10,18,.62) 0%,rgba(6,10,18,.86) 60%,var(--bg2) 100%)}
.ahero .wrap{position:relative;z-index:3;max-width:840px;padding-bottom:52px;padding-top:160px}
.ahero h1{font-size:40px;font-weight:800;letter-spacing:-.035em;line-height:1.28;margin:20px 0 22px}
.ameta{display:flex;gap:12px 24px;flex-wrap:wrap;font-size:11.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--mt)}
.ameta b{color:var(--ink2)}
.abody{background:var(--bg2);padding:0 0 88px}
.abody .in{max-width:840px;margin:0 auto;padding:0 32px}
.abody p{font-size:15.5px;color:var(--ink2);line-height:2.1;margin-bottom:20px}
.abody h2{font-size:22px;font-weight:800;margin:40px 0 16px;padding-left:15px;position:relative}
.abody h2::before{content:"";position:absolute;left:0;top:5px;bottom:5px;width:4px;background:var(--gr)}
.abody figure{margin:32px 0;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.abody img{width:100%;height:auto;display:block}   /* 正文图随栏宽自适应 */
.anote{margin-top:40px;border-left:4px solid var(--gr);background:var(--card);padding:20px 24px;
  font-size:12.5px;color:var(--mt);line-height:1.95;border-radius:0 10px 10px 0}
.anav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:32px}
.anav a{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px 24px;transition:.2s}
.anav a:hover{border-color:rgba(61,220,132,.45);transform:translateY(-2px)}
.anav a span{display:block;font-size:10.5px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--mt2);margin-bottom:8px}
.anav a b{font-size:14px;font-weight:700;line-height:1.6}
.anav a.nx{text-align:right}
.aback{display:inline-block;margin-top:28px;font-size:13px;font-weight:700;color:var(--mt)}
.aback:hover{color:var(--gr)}

/* ============================================================
   信息页 / 404
   ============================================================ */
.pg{background:var(--bg2);padding:0 0 88px}
.pg .in{max-width:840px;margin:0 auto;padding:0 32px}
.pg h2{font-size:19px;font-weight:800;margin:36px 0 13px;padding-left:14px;position:relative}
.pg h2::before{content:"";position:absolute;left:0;top:5px;bottom:5px;width:4px;background:var(--gr)}
.pg h2:first-child{margin-top:0}
.pg p{font-size:14.5px;color:var(--ink2);line-height:2.05;margin-bottom:14px}
.pg ul{list-style:none;margin:0 0 14px}
.pg li{font-size:14px;color:var(--ink2);line-height:1.95;padding-left:20px;position:relative;margin-bottom:9px}
.pg li::before{content:"";position:absolute;left:0;top:12px;width:8px;height:8px;border-radius:2px;background:var(--gr);transform:rotate(45deg)}
.err{padding:30px 0 0;text-align:center}
.err .code{font-size:76px;font-weight:800;color:var(--gr);letter-spacing:-.05em;line-height:1;margin-bottom:16px}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1180px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .trust .wrap{grid-template-columns:1fr 1fr}
}
@media (max-width:1024px){
  .sect .wrap{grid-template-columns:1fr;gap:34px;padding-top:120px;padding-bottom:120px}
  .sect.r .wrap{direction:ltr}
  .sect::before,.sect.r::before{background:linear-gradient(180deg,rgba(6,10,18,.72),rgba(6,10,18,.93))}
  .sect h2{font-size:33px}
  .hero h1{font-size:52px}
  .omenu .in{grid-template-columns:1fr;gap:34px}
  .omenu .side{border-left:none;padding-left:0;border-top:1px solid var(--line);padding-top:26px}
  .omenu nav a{font-size:32px}
  .phero h1{font-size:36px}
  .ahero h1{font-size:29px}
  .fg{grid-template-columns:1.4fr 1fr 1fr}
}
@media (max-width:900px){
  /* 手机端背景裁切更杂，首屏遮罩加厚 */
  .hero::before{background:linear-gradient(180deg,rgba(6,10,18,.93) 0%,rgba(6,10,18,.82) 42%,rgba(6,10,18,.97) 100%)}
  .hero::after{background:radial-gradient(72% 54% at 50% 46%,rgba(6,10,18,.86) 0%,rgba(6,10,18,.5) 62%,transparent 82%)}
  .prow{grid-template-columns:1fr;gap:16px}
  .abody .in,.pg .in{padding:0 22px}
}
@media (max-width:600px){
  .wrap{padding:0 22px}
  .hero h1{font-size:37px}
  .hero .sub{font-size:15px}
  .hero .btns{flex-direction:column;align-items:stretch}
  .hero .btns a{text-align:center}
  .grid{grid-template-columns:1fr}
  .trust .wrap{grid-template-columns:1fr}
  .cta h2{font-size:27px}
  .cta .btns{flex-direction:column}
  .fg{grid-template-columns:1fr}
  .omenu nav a{font-size:26px}
  .anav{grid-template-columns:1fr}
  .anav a.nx{text-align:left}
  .sect h2{font-size:27px}
  .sect .fig img{height:210px}
}