/* 智练K线官网 - 深色科技风 + 股票元素 */
:root{
  --bg:#0b1220;
  --bg2:#0f172a;
  --card:#131c31;
  --card2:#182238;
  --line:#233049;
  --txt:#e6ecf7;
  --txt2:#93a1ba;
  --up:#ef4444;
  --down:#10b981;
  --gold:#f5b942;
  --blue:#3b82f6;
  --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--txt);
  font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}

/* ---------- 顶部导航 ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(11,18,32,.86);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav .wrap{display:flex;align-items:center;gap:26px;height:62px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px}
.logo img{width:32px;height:32px;border-radius:8px}
.nav a.item{color:var(--txt2);font-size:15px;transition:color .2s}
.nav a.item:hover,.nav a.item.on{color:var(--txt)}
.nav .spacer{flex:1}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 22px;border-radius:10px;font-size:15px;font-weight:600;
  cursor:pointer;border:none;transition:transform .15s,box-shadow .2s,opacity .2s;
}
.btn:active{transform:scale(.97)}
.btn-red{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;box-shadow:0 6px 18px rgba(239,68,68,.28)}
.btn-red:hover{box-shadow:0 8px 24px rgba(239,68,68,.4)}
.btn-ghost{background:transparent;color:var(--txt);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--txt2)}
.btn-sm{padding:6px 14px;font-size:13px;border-radius:8px}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;padding:88px 0 72px}
.hero .kline-bg{position:absolute;inset:0;opacity:.5;pointer-events:none}
.hero .grid-lines{
  position:absolute;inset:0;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:56px 56px;opacity:.25;
  mask-image:radial-gradient(ellipse at 50% 40%,#000 30%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse at 50% 40%,#000 30%,transparent 75%);
}
.hero .candles{position:absolute;inset:auto 0 0 0;height:240px;display:flex;align-items:flex-end;gap:14px;justify-content:center;opacity:.55}
.hero .candles i{display:block;width:10px;border-radius:2px;position:relative}
.hero .candles i::before{content:"";position:absolute;left:50%;transform:translateX(-50%);width:2px;background:inherit;opacity:.7}
.hero .candles i.up{background:var(--up)}
.hero .candles i.up::before{top:-16px;height:16px}
.hero .candles i.dn{background:var(--down)}
.hero .candles i.dn::before{bottom:-12px;height:12px}
.hero-inner{position:relative;text-align:center}
.badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:999px;font-size:13px;color:var(--gold);
  background:rgba(245,185,66,.1);border:1px solid rgba(245,185,66,.35);margin-bottom:22px;
}
.hero h1{font-size:clamp(30px,5.4vw,52px);font-weight:800;letter-spacing:1px;line-height:1.25}
.hero h1 .accent{background:linear-gradient(90deg,#ef4444,#f5b942);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.sub{margin:18px auto 0;max-width:640px;color:var(--txt2);font-size:clamp(15px,2vw,18px)}
.hero .cta{margin-top:34px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero .tickers{margin-top:44px;display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.ticker{
  display:flex;align-items:baseline;gap:8px;padding:8px 16px;border-radius:10px;
  background:var(--card);border:1px solid var(--line);font-size:14px;color:var(--txt2);
}
.ticker b{color:var(--txt);font-weight:600}
.ticker .up{color:var(--up)}
.ticker .dn{color:var(--down)}
.tickernote{text-align:center;color:#5b6a85;font-size:12px;margin-top:10px}

/* ---------- 通用区块 ---------- */
section{padding:72px 0}
.sec-head{text-align:center;margin-bottom:44px}
.sec-head h2{font-size:clamp(24px,3.4vw,34px);font-weight:700}
.sec-head p{color:var(--txt2);margin-top:10px;font-size:15px}
.sec-head .rule{width:52px;height:4px;border-radius:2px;margin:16px auto 0;background:linear-gradient(90deg,var(--up),var(--gold))}

/* ---------- 特性卡片 ---------- */
.features{background:var(--bg2)}
.feat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px}
.feat{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 24px;transition:transform .2s,border-color .2s;position:relative;overflow:hidden;
}
.feat:hover{transform:translateY(-4px);border-color:#33415e}
.feat .ico{
  width:52px;height:52px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  font-size:26px;margin-bottom:18px;
}
.feat h3{font-size:18px;font-weight:700;margin-bottom:10px}
.feat p{color:var(--txt2);font-size:14px}
.feat .tag{
  position:absolute;top:14px;right:-30px;transform:rotate(38deg);
  background:var(--up);color:#fff;font-size:11px;padding:3px 34px;
}
.ico.blue{background:rgba(59,130,246,.15)}
.ico.purple{background:rgba(168,85,247,.15)}
.ico.orange{background:rgba(249,115,22,.15)}
.ico.green{background:rgba(16,185,129,.15)}
.ico.gold{background:rgba(245,185,66,.15)}
.ico.red{background:rgba(239,68,68,.15)}

/* ---------- 截图展示 ---------- */
.shots .track{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:18px;
}
.shot{
  background:var(--card);border:1px solid var(--line);border-radius:18px;padding:10px;
  transition:transform .2s,border-color .2s;
}
.shot:hover{transform:translateY(-4px);border-color:#33415e}
.shot .frame{border-radius:12px;overflow:hidden;background:#000;aspect-ratio:9/17.5}
.shot .frame img{width:100%;height:100%;object-fit:cover;object-position:top}
.shot figcaption{text-align:center;color:var(--txt2);font-size:13px;padding:10px 4px 4px}

/* ---------- 下载区 ---------- */
.download{background:var(--bg2)}
.dl-card{
  background:linear-gradient(145deg,var(--card),var(--card2));
  border:1px solid var(--line);border-radius:20px;padding:40px;
  display:grid;grid-template-columns:1.2fr .8fr;gap:36px;align-items:center;
}
.dl-card h3{font-size:26px;font-weight:700}
.dl-card .ver{color:var(--gold);font-size:15px;margin-top:8px}
.dl-card .notes{margin-top:16px}
.dl-card .notes li{color:var(--txt2);font-size:14px;margin-left:18px;margin-bottom:6px}
.dl-card .meta{color:var(--txt2);font-size:13px;margin-top:14px}
.dl-right{text-align:center}
.dl-right .btn{width:100%;padding:14px 20px;font-size:16px}
.dl-right .hist{margin-top:14px;font-size:13px;color:var(--txt2)}
.dl-right .hist a{color:var(--blue)}
.dl-qr-note{margin-top:12px;font-size:12px;color:var(--txt2)}
@media (max-width:820px){.dl-card{grid-template-columns:1fr}}

/* ---------- 风险提示条 ---------- */
.riskbar{
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  background:rgba(239,68,68,.05);padding:18px 0;
}
.riskbar .wrap{display:flex;align-items:center;gap:12px;color:var(--txt2);font-size:13px;flex-wrap:wrap}
.riskbar b{color:var(--up)}

/* ---------- 政策/关于页正文 ---------- */
.doc{padding:56px 0 80px}
.doc .box{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:40px clamp(20px,5vw,56px);
}
.doc h1{font-size:26px;margin-bottom:8px}
.doc .upd{color:var(--txt2);font-size:13px;margin-bottom:28px}
.doc h2{font-size:18px;margin:30px 0 12px;color:var(--txt)}
.doc p,.doc li{color:var(--txt2);font-size:14.5px;margin-bottom:10px}
.doc li{margin-left:20px}
.doc b{color:var(--txt)}

/* ---------- 页脚 ---------- */
footer{border-top:1px solid var(--line);background:var(--bg2);padding:44px 0 30px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.foot-grid h4{font-size:15px;margin-bottom:14px}
.foot-grid p,.foot-grid a{color:var(--txt2);font-size:13.5px;display:block;margin-bottom:8px}
.foot-grid a:hover{color:var(--txt)}
.copyright{text-align:center;color:#5b6a85;font-size:12.5px;margin-top:34px;padding-top:20px;border-top:1px solid var(--line)}
@media (max-width:820px){.foot-grid{grid-template-columns:1fr}}

/* ---------- 管理后台 ---------- */
.admin-page{min-height:100vh;background:var(--bg)}
.admin-box{max-width:960px;margin:0 auto;padding:40px 20px}
.login-card{max-width:380px;margin:12vh auto;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:36px}
.login-card h2{font-size:20px;margin-bottom:6px}
.login-card p{color:var(--txt2);font-size:13px;margin-bottom:22px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;color:var(--txt2);margin-bottom:6px}
.field input,.field textarea{
  width:100%;background:var(--bg2);border:1px solid var(--line);border-radius:10px;
  color:var(--txt);padding:11px 14px;font-size:14px;font-family:inherit;
}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--blue)}
.field textarea{min-height:96px;resize:vertical}
.err{color:var(--up);font-size:13px;margin-top:10px;min-height:18px}
.ok{color:var(--down);font-size:13px;margin-top:10px;min-height:18px}
.admin-head{display:flex;align-items:center;gap:14px;margin-bottom:26px;flex-wrap:wrap}
.admin-head h2{font-size:22px;flex:1}
.cur-card{
  background:linear-gradient(145deg,var(--card),var(--card2));border:1px solid var(--line);
  border-radius:14px;padding:22px 26px;margin-bottom:26px;display:flex;gap:20px;align-items:center;flex-wrap:wrap;
}
.cur-card .v{font-size:26px;font-weight:800;color:var(--gold)}
.cur-card .d{color:var(--txt2);font-size:13px}
.panel{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:26px;margin-bottom:26px}
.panel h3{font-size:16px;margin-bottom:18px}
.drop{
  border:2px dashed var(--line);border-radius:12px;padding:26px;text-align:center;color:var(--txt2);
  font-size:14px;cursor:pointer;transition:border-color .2s,background .2s;margin-bottom:16px;
}
.drop.on{border-color:var(--blue);background:rgba(59,130,246,.06)}
.drop b{color:var(--txt)}
table{width:100%;border-collapse:collapse;font-size:13.5px}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);color:var(--txt2)}
th{color:var(--txt);font-weight:600;font-size:13px}
td .btn{margin-right:6px}
.pill{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12px}
.pill.cur{background:rgba(16,185,129,.15);color:var(--down)}
.pill.old{background:rgba(147,161,186,.12);color:var(--txt2)}
.mono{font-family:ui-monospace,Consolas,monospace;font-size:12px;color:var(--txt2);word-break:break-all}
.progress{height:6px;background:var(--bg2);border-radius:3px;overflow:hidden;margin-top:10px;display:none}
.progress i{display:block;height:100%;width:0;background:var(--blue);transition:width .2s}

/* toast */
#toast{
  position:fixed;left:50%;bottom:34px;transform:translateX(-50%) translateY(20px);
  background:#1c2740;border:1px solid var(--line);color:var(--txt);
  padding:12px 22px;border-radius:12px;font-size:14px;opacity:0;pointer-events:none;
  transition:opacity .25s,transform .25s;z-index:99;max-width:86vw;
}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}