/* 基础 */
:root{
  --bg:#0F1419;
  --bg-alt:#0A0E14;
  --bg-deep:#06090D;
  --orange:#FF7A29;
  --orange-h:#FF6A15;
  --fg:#E5E7EB;
  --muted:#9CA3AF;
  --muted-2:#6B7280;
  --line:rgba(255,255,255,.10);
  --line-s:rgba(255,255,255,.06);
  --fill:rgba(255,255,255,.05);
  --fill-h:rgba(255,255,255,.09);
  --r:12px;
  --max:1160px;
  --hero-img:url("/upload/hero.jpg");
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px;-webkit-text-size-adjust:100%;background:var(--bg)}
body{
  margin:0;background:var(--bg);color:var(--fg);
  font-family:"Noto Sans TC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{color:#fff;margin:0;line-height:1.35;font-weight:700}
p{margin:0}
ul,ol{margin:0;padding:0}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* 顶部导航 */
.site-head{
  position:sticky;top:0;z-index:90;background:rgba(10,14,20,.86);
  backdrop-filter:blur(12px);border-bottom:1px solid var(--line-s);
}
/* 首页：导航浮在 Hero 大图之上 */
.site-head.head-float{
  position:absolute;top:0;left:0;right:0;background:transparent;border:0;
  transition:background .3s,border-color .3s;
}
.site-head.head-float.pin{
  position:fixed;background:rgba(10,14,20,.9);backdrop-filter:blur(12px);border-bottom:1px solid var(--line-s);
}
.head-in{max-width:var(--max);margin:0 auto;height:72px;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:flex;align-items:center;gap:11px;flex:none}
.logo .mk{width:38px;height:38px;flex:none;object-fit:contain;display:block}
.logo .tx b{display:block;color:#fff;font-size:15.5px;line-height:1.3;letter-spacing:.4px;white-space:nowrap;font-weight:700}
.logo .tx span{display:block;font-size:9.5px;color:var(--muted-2);letter-spacing:1.1px;text-transform:uppercase}
.nav{display:flex;align-items:center;gap:4px;flex:1;justify-content:center}
.nav a{color:#B8BEC6;font-size:14.5px;padding:8px 13px;border-radius:6px;white-space:nowrap;transition:.2s}
.nav a:hover{color:#fff}
.nav a.on{color:var(--orange)}
.head-tools{display:flex;align-items:center;gap:12px;flex:none}
.head-btn{background:var(--orange);color:#fff;font-size:14px;font-weight:600;padding:10px 20px;border-radius:6px;flex:none;transition:.2s}
.head-btn:hover{background:var(--orange-h)}

/* 语言下拉 */
.lang-dd{position:relative;flex:none}
.lang-btn{display:inline-flex;align-items:center;gap:8px;height:34px;padding:0 11px;background:transparent;
  border:1px solid var(--line);border-radius:6px;color:#CBD2D9;font:inherit;font-size:13px;cursor:pointer;transition:.2s}
.lang-btn:hover{border-color:rgba(255,255,255,.24);color:#fff}
.lang-btn .code{font-weight:700;font-size:11.5px;color:var(--muted);letter-spacing:.5px}
.lang-btn .caret{width:5px;height:5px;border-right:1.4px solid currentColor;border-bottom:1.4px solid currentColor;
  transform:rotate(45deg);margin-top:-3px}
.lang-menu{position:absolute;right:0;top:calc(100% + 8px);width:236px;background:#12171E;border:1px solid var(--line);
  border-radius:10px;padding:6px;display:none;box-shadow:0 18px 44px rgba(0,0,0,.55);max-height:70vh;overflow:auto;z-index:120}
.lang-dd.open .lang-menu{display:block}
.lang-item{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:6px;color:#C2CBD6;font-size:13.5px}
.lang-item:hover{background:var(--fill);color:#fff}
.lang-item.on{color:#fff}
.lang-item .code{width:26px;font-size:11.5px;font-weight:700;color:var(--muted-2);letter-spacing:.5px}
.lang-item.on .code{color:var(--orange)}
.lang-item .tick{margin-left:auto;width:11px;height:6px;border-left:1.6px solid var(--orange);border-bottom:1.6px solid var(--orange);
  transform:rotate(-45deg) translateY(-2px)}

/* 移动端菜单 */
.burger{display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:6px;background:transparent;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.burger span{width:17px;height:1.6px;background:#fff;display:block;transition:.25s}
.burger.on span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.on span:nth-child(2){opacity:0}
.burger.on span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.mnav{display:none;background:var(--bg-alt);border-bottom:1px solid var(--line-s)}
.mnav.open{display:block}
.mnav a{display:block;color:#D6DBE0;padding:14px 22px;border-top:1px solid var(--line-s);font-size:15px}
.mnav a.m-lang{color:var(--orange);font-weight:600}

/* Hero */
.hero{
  position:relative;overflow:hidden;color:#fff;background-color:var(--bg-alt);
  background-image:var(--hero-img);background-size:cover;background-position:center;
  min-height:92vh;display:flex;align-items:center;justify-content:center;
  padding:120px 0 72px;text-align:center;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(6,9,13,.78) 0%,rgba(6,9,13,.72) 45%,rgba(10,14,20,.94) 100%);
}
.hero .wrap{position:relative;z-index:2;max-width:860px}
.hero h1{color:#fff;font-size:clamp(1.9rem,5vw,3.25rem);line-height:1.24;letter-spacing:.5px;margin-bottom:22px;font-weight:700}
.hero h1 .em{color:var(--orange)}
.hero .sub{color:#C7CDD4;font-size:clamp(.95rem,2.4vw,1.05rem);max-width:720px;margin:0 auto 34px;line-height:1.85}
.hero-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 32px;border-radius:6px;font-weight:600;font-size:15px;transition:.2s;border:1px solid transparent}
.btn-o{background:var(--orange);color:#fff}
.btn-o:hover{background:var(--orange-h)}
.btn-w{background:transparent;color:#fff;border-color:rgba(255,255,255,.34)}
.btn-w:hover{border-color:#fff;color:#fff}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:52px;
  padding:26px 18px;border:1px solid rgba(255,255,255,.12);border-radius:var(--r);
  background:rgba(255,255,255,.05);backdrop-filter:blur(6px)}
.stats .n{font-size:clamp(1.5rem,4vw,2.1rem);font-weight:700;color:#fff;line-height:1.15;letter-spacing:-.5px}
.stats .n.o{color:var(--orange)}
.stats .l{font-size:12.5px;color:#A6ADB5;margin-top:4px}

/* 通用区块 */
.sec{padding:78px 0;background:var(--bg-alt);border-top:1px solid var(--line-s)}
.sec--dark{background:var(--bg)}
.sec-head{text-align:center;max-width:760px;margin:0 auto 44px}
.sec-head h2{font-size:clamp(1.35rem,3.4vw,2rem);letter-spacing:.3px;color:#fff}
.sec-head p{color:var(--muted);font-size:15px;margin-top:12px}

/* 您是否遇到过这些问题 */
.problems{display:grid;grid-template-columns:1fr;gap:14px;max-width:900px;margin:0 auto}
.pb{display:grid;grid-template-columns:36px 1fr;column-gap:16px;align-items:start;text-align:left;
  background:var(--fill);border:1px solid var(--line);border-radius:var(--r);padding:20px 22px;transition:.2s}
.pb:hover{background:var(--fill-h)}
.pb .ico{grid-column:1;grid-row:1 / span 2;width:36px;height:36px;display:flex;align-items:center;justify-content:center}
.pb h3,.pb p{grid-column:2}
.pb .ico svg{width:32px;height:32px;stroke:var(--orange);fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.pb h3{font-size:16.5px;margin-bottom:6px;color:#fff}
.pb p{color:var(--muted);font-size:14.5px;line-height:1.8}

/* 趋势图 */
.trend{background:var(--fill);border:1px solid var(--line);border-radius:var(--r);padding:32px 26px 20px;max-width:900px;margin:0 auto}
.trend h3{font-size:15px;text-align:center;color:#DDE3E9;font-weight:600;margin-bottom:26px}
.chart{display:flex;align-items:flex-end;justify-content:space-between;gap:10px;height:210px;padding-bottom:8px;border-bottom:1px solid var(--line-s)}
.col{flex:1;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;height:100%}
.col .v{font-size:12px;color:var(--orange);font-weight:700;margin-bottom:6px}
.col .bar{width:100%;max-width:56px;border-radius:4px 4px 0 0;background:linear-gradient(180deg,#FF9252,#FF7A29);
  transform-origin:bottom;animation:barGrow .9s cubic-bezier(.2,.7,.3,1) both}
@keyframes barGrow{from{transform:scaleY(.02)}to{transform:scaleY(1)}}
.years{display:flex;justify-content:space-between;gap:10px;margin-top:10px}
.years span{flex:1;text-align:center;font-size:12.5px;color:var(--muted-2)}
.trend .note{text-align:center;font-size:12px;color:var(--muted-2);margin-top:14px}

/* 案例 / 技巧卡片 */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.cards--usdt{position:relative;isolation:isolate;background:none;border:0;padding:0}
.ac{background:var(--fill);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column;transition:.2s}
.ac:hover{background:var(--fill-h);border-color:rgba(255,255,255,.18);transform:translateY(-3px)}
.ac .pic{position:relative;aspect-ratio:16/9;overflow:hidden;background:#131820}
.ac .pic img{width:100%;height:100%;object-fit:cover;transition:.4s}
.ac:hover .pic img{transform:scale(1.03)}
.ac .txt{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1}
.ac .tag{display:inline-block;align-self:flex-start;font-size:11.5px;color:#FF9A52;background:rgba(255,122,41,.12);
  padding:3px 9px;border-radius:4px;margin-bottom:10px;letter-spacing:.3px}
.ac h3{font-size:16.5px;line-height:1.55;margin-bottom:8px;color:#fff}
.ac p{color:var(--muted);font-size:13.8px;line-height:1.75;flex:1}
.ac .more{margin-top:14px;color:var(--orange);font-size:13.5px;font-weight:600}
.ac .more::after{content:" →"}
.more-wrap{text-align:center;margin-top:40px}
.btn-line{display:inline-block;border:1px solid var(--line);color:#D3D9DF;padding:11px 30px;border-radius:6px;font-size:14.5px;transition:.2s}
.btn-line:hover{border-color:rgba(255,255,255,.3);color:#fff}

/* 处理流程 */
.flow{display:grid;grid-template-columns:1fr;gap:16px;max-width:940px;margin:0 auto}
.fi{display:grid;grid-template-columns:220px 1fr;gap:26px;align-items:start;
  background:var(--fill);border:1px solid var(--line);border-radius:var(--r);padding:22px}
.fi .pic{border-radius:8px;overflow:hidden;aspect-ratio:16/10;border:1px solid var(--line-s);background:#131820}
.fi .pic img{width:100%;height:100%;object-fit:cover}
.fi .no{display:inline-flex;align-items:center;gap:8px;color:var(--orange);font-weight:700;font-size:12.5px;letter-spacing:1.6px;margin-bottom:10px}
.fi .no i{display:block;width:20px;height:1.5px;background:var(--orange);font-style:normal}
.fi h3{color:#fff;font-size:18px;margin-bottom:10px}
.fi p{color:var(--muted);font-size:14.5px;line-height:1.8}
.fi ul{list-style:none;margin-top:14px}
.fi ul li{position:relative;padding-left:16px;color:#C7CDD4;font-size:13.8px;margin-bottom:6px}
.fi ul li::before{content:"";position:absolute;left:0;top:9px;width:5px;height:5px;border-radius:1px;background:var(--orange);opacity:.85}

/* 页脚 */
.foot{background:var(--bg-deep);border-top:1px solid var(--line-s);padding:36px 0 40px;text-align:center;color:var(--muted-2);font-size:12.5px}
.foot .brandline{color:#B6BDC5;font-size:14px;margin-bottom:8px}

/* 详情页 */
.d-head{background:var(--bg-alt);padding:52px 0 44px;color:#fff;border-bottom:1px solid var(--line-s)}
.crumb{font-size:12.5px;color:var(--muted-2);margin-bottom:16px}
.crumb a:hover{color:#fff}
.d-head h1{color:#fff;font-size:clamp(1.4rem,3.6vw,2.05rem);line-height:1.5;letter-spacing:.3px;max-width:820px}
.d-meta{display:flex;flex-wrap:wrap;gap:10px 20px;margin-top:18px;font-size:13px;color:var(--muted)}
.d-meta b{color:var(--orange);font-weight:700}
.d-cover{max-width:900px;margin:-30px auto 0;padding:0 20px;position:relative;z-index:3}
.d-cover img{width:100%;border-radius:var(--r);aspect-ratio:16/8;object-fit:cover;border:1px solid var(--line-s)}
.article{max-width:820px;margin:0 auto;padding:42px 20px 20px}
.article .lead{font-size:16.5px;color:#CBD2D9;line-height:1.9;padding:18px 20px;background:var(--fill);
  border-left:2px solid var(--orange);border-radius:0 8px 8px 0;margin-bottom:30px}
.article h3{font-size:17.5px;margin:34px 0 12px;line-height:1.4;color:#fff}
.article p{color:#C7CDD4;font-size:15.5px;line-height:1.95;margin-bottom:16px}
.article ol{margin:0 0 18px 2px;padding-left:20px}
.article ol li{color:#C7CDD4;font-size:15px;line-height:1.95;margin-bottom:6px}
.article .src{color:var(--muted-2);font-size:12.5px;margin-top:30px;padding-top:16px;border-top:1px solid var(--line-s)}
.article .tipbox{margin:34px 0;background:rgba(255,122,41,.06);border:1px solid rgba(255,122,41,.22);border-radius:var(--r);padding:20px 22px}
.article .tipbox h4{color:var(--orange);font-size:15px;margin-bottom:8px}
.article .tipbox p{font-size:14.5px;color:#D8C4B4;margin:0}
.back-wrap{margin:40px 0 8px;text-align:center}
.back-btn{display:inline-block;background:var(--orange);color:#fff;font-size:15px;font-weight:600;
  padding:13px 38px;border-radius:6px;letter-spacing:.5px;transition:.2s}
.back-btn:hover{background:var(--orange-h)}
.related{padding:64px 0 76px;background:var(--bg)}

/* 空状态 */
.empty{padding:60px 20px;text-align:center;color:var(--muted-2)}

/* 响应式 */
@media(max-width:980px){
  .nav{display:none}
  .head-btn{display:none}
  .burger{display:flex}
  .cards{grid-template-columns:repeat(2,1fr)}
  .fi{grid-template-columns:1fr;gap:18px}
  .sec{padding:56px 0}
}
@media(max-width:640px){
  .head-in{height:60px;padding:0 16px}
  .wrap{padding:0 16px}
  .logo{flex:1 1 auto;min-width:0}
  .logo .mk{width:32px;height:32px}
  .logo .tx{min-width:0}
  .logo .tx b{font-size:14px;max-width:44vw;overflow:hidden;text-overflow:ellipsis}
  .logo .tx span{font-size:8.5px;letter-spacing:.9px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .hero{min-height:auto;padding:96px 0 56px}
  .hero h1{font-size:1.75rem}
  .stats{grid-template-columns:repeat(2,1fr);padding:20px 12px;margin-top:34px;gap:18px 6px}
  .cards{grid-template-columns:1fr;gap:16px}
  .pb{padding:18px}
  .btn{padding:12px 24px;font-size:14.5px}
  .hero-btns .btn{flex:1 1 40%;text-align:center}
  .trend{padding:24px 16px 16px}
  .chart{height:170px;gap:6px}
  .col .bar{max-width:34px}
  .fi{padding:16px}
  .article{padding:32px 16px 10px}
  .article p{font-size:15px;line-height:1.9}
  .d-cover{margin-top:-20px}
  .sec-head{margin-bottom:30px}
  .back-btn{display:block;width:100%;text-align:center;padding:15px 0}
}