/* ============================================================
   aitradingbot.us — Premium fintech design system
   Dark-first, distinctive, fast. No external deps.
   ============================================================ */
:root{
  --bg:#0a0e17;            /* deep navy-black */
  --bg-2:#0f1421;          /* panel */
  --bg-3:#161d2e;          /* raised */
  --line:#1f2940;          /* hairline borders */
  --line-2:#2a3550;
  --txt:#e6ebf5;           /* primary text */
  --txt-2:#9aa7c2;         /* secondary */
  --txt-3:#6b7896;         /* muted */
  --mint:#2bd9a8;          /* primary accent — profit green */
  --mint-2:#11c79a;
  --cyan:#34c3ff;          /* secondary accent */
  --violet:#8b7cff;        /* tertiary */
  --gold:#ffc24b;
  --red:#ff5d6c;           /* loss/drawdown */
  --glow:rgba(43,217,168,.35);
  --radius:16px;
  --radius-sm:10px;
  --maxw:1140px;
  --font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"JetBrains Mono","SF Mono",ui-monospace,"Cascadia Code",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--txt);font-family:var(--font);
  font-size:17px;line-height:1.7;letter-spacing:-.01em;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
/* ambient gradient field */
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(900px 600px at 78% -8%, rgba(52,195,255,.10), transparent 60%),
    radial-gradient(800px 600px at 8% 8%, rgba(43,217,168,.10), transparent 55%),
    radial-gradient(700px 500px at 50% 110%, rgba(139,124,255,.08), transparent 60%);
}
body::after{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.4;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:60px 60px;
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000,transparent 75%);
          mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000,transparent 75%);
}
a{color:var(--cyan);text-decoration:none;transition:color .15s}
a:hover{color:var(--mint)}
img{max-width:100%;height:auto}
h1,h2,h3,h4{line-height:1.2;letter-spacing:-.025em;font-weight:800;margin:0 0 .5em}
h1{font-size:clamp(2rem,5vw,3.4rem)}
h2{font-size:clamp(1.5rem,3.5vw,2.3rem);margin-top:1.6em}
h3{font-size:clamp(1.2rem,2.5vw,1.5rem);margin-top:1.4em}
p{margin:0 0 1.1em;color:var(--txt-2)}
strong{color:var(--txt);font-weight:700}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.narrow{max-width:820px}
.gradient-text{background:linear-gradient(100deg,var(--mint),var(--cyan) 55%,var(--violet));-webkit-background-clip:text;background-clip:text;color:transparent}
.mint{color:var(--mint)}.red{color:var(--red)}.gold{color:var(--gold)}.cyan{color:var(--cyan)}
.mono{font-family:var(--mono)}
.center{text-align:center}

/* ---------- Header / nav ---------- */
header.site{
  position:sticky;top:0;z-index:50;
  background:rgba(10,14,23,.72);backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:24px;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.12rem;color:var(--txt);letter-spacing:-.03em}
.brand:hover{color:var(--txt)}
.brand .logo{width:34px;height:34px;flex:0 0 auto}
.nav-links{display:flex;align-items:center;gap:6px;margin-left:auto}
.nav-links a{
  color:var(--txt-2);font-size:.95rem;font-weight:600;padding:8px 13px;border-radius:9px;
  transition:background .15s,color .15s;
}
.nav-links a:hover{color:var(--txt);background:var(--bg-3)}
.nav-links a.cta{background:linear-gradient(100deg,var(--mint),var(--mint-2));color:#06231b;font-weight:700;box-shadow:0 6px 22px -8px var(--glow)}
.nav-links a.cta:hover{filter:brightness(1.06);color:#06231b}
.nav-toggle{display:none;margin-left:auto;background:var(--bg-3);border:1px solid var(--line);color:var(--txt);
  width:42px;height:42px;border-radius:10px;cursor:pointer;font-size:1.2rem;align-items:center;justify-content:center}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;padding:14px 26px;border-radius:12px;font-weight:700;
  font-size:1rem;cursor:pointer;border:1px solid transparent;transition:.18s;text-align:center}
.btn-primary{background:linear-gradient(100deg,var(--mint),var(--mint-2));color:#06231b;box-shadow:0 12px 34px -12px var(--glow)}
.btn-primary:hover{filter:brightness(1.07);transform:translateY(-2px);color:#06231b}
.btn-ghost{background:var(--bg-3);border-color:var(--line-2);color:var(--txt)}
.btn-ghost:hover{border-color:var(--mint);color:var(--mint)}

/* ---------- Hero ---------- */
.hero{padding:72px 0 36px;text-align:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.8rem;font-weight:700;letter-spacing:.08em;
  text-transform:uppercase;color:var(--mint);background:rgba(43,217,168,.08);border:1px solid rgba(43,217,168,.25);
  padding:7px 15px;border-radius:999px;margin-bottom:22px}
.hero p.lead{font-size:clamp(1.05rem,2.2vw,1.3rem);color:var(--txt-2);max-width:680px;margin:0 auto 30px}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ---------- Cards / panels ---------- */
.panel{background:linear-gradient(180deg,var(--bg-2),var(--bg-2));border:1px solid var(--line);
  border-radius:var(--radius);padding:26px}
.card{background:linear-gradient(180deg,rgba(22,29,46,.7),rgba(15,20,33,.7));border:1px solid var(--line);
  border-radius:var(--radius);padding:26px;transition:transform .2s,border-color .2s,box-shadow .2s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-4px);border-color:var(--line-2);box-shadow:0 24px 50px -28px rgba(0,0,0,.7)}
.card .ico{width:46px;height:46px;display:flex;align-items:center;justify-content:center;border-radius:12px;
  background:rgba(43,217,168,.1);border:1px solid rgba(43,217,168,.2);margin-bottom:16px}
.card h3{margin-top:0;font-size:1.15rem}
.card p{font-size:.97rem;margin-bottom:0}
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

/* ---------- Stats ---------- */
.statgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:30px 0}
.stat{background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius-sm);padding:18px;text-align:center}
.stat .num{font-family:var(--mono);font-size:1.8rem;font-weight:700;color:var(--mint);line-height:1}
.stat.neg .num{color:var(--red)}
.stat .lbl{font-size:.78rem;color:var(--txt-3);text-transform:uppercase;letter-spacing:.06em;margin-top:7px}

/* ---------- Backtester ---------- */
.bt{background:linear-gradient(180deg,#0d1322,#0a0f1b);border:1px solid var(--line-2);border-radius:20px;
  padding:24px;box-shadow:0 30px 80px -40px rgba(0,0,0,.9)}
.bt-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:14px;margin-bottom:18px}
.bt-controls{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:18px}
.field label{display:block;font-size:.74rem;text-transform:uppercase;letter-spacing:.06em;color:var(--txt-3);margin-bottom:6px;font-weight:700}
.field select,.field input{width:100%;background:var(--bg);border:1px solid var(--line-2);color:var(--txt);
  border-radius:10px;padding:11px 12px;font-size:.95rem;font-family:var(--font);transition:border-color .15s}
.field select:focus,.field input:focus{outline:none;border-color:var(--mint);box-shadow:0 0 0 3px rgba(43,217,168,.12)}
.bt-canvas-wrap{position:relative;background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:12px;margin-bottom:18px}
canvas{display:block;width:100%;height:auto}
.bt-results{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
.metric{background:var(--bg-3);border:1px solid var(--line);border-radius:10px;padding:14px;text-align:center}
.metric .v{font-family:var(--mono);font-size:1.35rem;font-weight:700;line-height:1}
.metric .k{font-size:.7rem;color:var(--txt-3);text-transform:uppercase;letter-spacing:.05em;margin-top:6px}
.pos{color:var(--mint)}.negv{color:var(--red)}

/* ---------- Tables ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);margin:24px 0}
table{border-collapse:collapse;width:100%;font-size:.94rem;min-width:560px}
th,td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line)}
thead th{background:var(--bg-3);color:var(--txt);font-weight:700;font-size:.82rem;text-transform:uppercase;letter-spacing:.04em;position:sticky;top:0}
tbody tr:hover{background:rgba(43,217,168,.03)}
tbody tr:last-child td{border-bottom:none}
td.good{color:var(--mint);font-weight:700}
.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-size:.74rem;font-weight:700;letter-spacing:.02em}
.badge.win{background:rgba(43,217,168,.12);color:var(--mint);border:1px solid rgba(43,217,168,.25)}
.badge.warn{background:rgba(255,194,75,.12);color:var(--gold);border:1px solid rgba(255,194,75,.25)}

/* ---------- Article / prose ---------- */
.prose{font-size:1.06rem}
.prose h2{border-top:1px solid var(--line);padding-top:1.2em}
.prose h2:first-of-type{border-top:none;padding-top:0}
.prose ul,.prose ol{color:var(--txt-2);padding-left:1.3em;margin:0 0 1.2em}
.prose li{margin-bottom:.5em}
.prose li::marker{color:var(--mint)}
.prose a{border-bottom:1px solid rgba(52,195,255,.3)}
.prose blockquote{margin:1.4em 0;padding:16px 22px;border-left:3px solid var(--mint);background:var(--bg-2);border-radius:0 12px 12px 0;color:var(--txt)}
.prose blockquote p:last-child{margin-bottom:0}
.callout{background:var(--bg-2);border:1px solid var(--line);border-left:3px solid var(--cyan);border-radius:0 12px 12px 0;padding:18px 22px;margin:1.5em 0}
.callout.warn{border-left-color:var(--gold)}
.callout.danger{border-left-color:var(--red)}
.callout p:last-child{margin-bottom:0}
.callout strong{display:block;margin-bottom:4px}

/* ---------- Code blocks ---------- */
pre{background:#070b13;border:1px solid var(--line-2);border-radius:12px;padding:18px 20px;overflow-x:auto;
  margin:1.4em 0;font-family:var(--mono);font-size:.86rem;line-height:1.65;position:relative}
pre code{color:#c9d4ea;font-family:var(--mono);white-space:pre}
code{font-family:var(--mono);font-size:.9em;background:var(--bg-3);padding:2px 7px;border-radius:6px;color:var(--cyan)}
pre code .c-kw{color:#8b7cff}.c-str{color:#2bd9a8}.c-num{color:#ffc24b}.c-com{color:#6b7896;font-style:italic}.c-fn{color:#34c3ff}
.code-label{position:absolute;top:0;right:0;font-family:var(--mono);font-size:.7rem;color:var(--txt-3);
  background:var(--bg-3);padding:4px 11px;border-radius:0 11px 0 10px;border-left:1px solid var(--line-2);border-bottom:1px solid var(--line-2)}

/* ---------- TOC ---------- */
.toc{background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;margin:0 0 30px}
.toc strong{display:block;font-size:.78rem;text-transform:uppercase;letter-spacing:.07em;color:var(--txt-3);margin-bottom:10px}
.toc ol{margin:0;padding-left:1.2em;columns:2;column-gap:32px}
.toc li{margin-bottom:6px}
.toc a{color:var(--txt-2);border:none}
.toc a:hover{color:var(--mint)}

/* ---------- Breadcrumb ---------- */
.crumb{font-size:.85rem;color:var(--txt-3);padding:18px 0 0}
.crumb a{color:var(--txt-3)}
.crumb a:hover{color:var(--mint)}
.crumb span{color:var(--txt-2)}

/* ---------- Author box ---------- */
.author{display:flex;gap:18px;align-items:flex-start;background:var(--bg-2);border:1px solid var(--line);
  border-radius:var(--radius);padding:22px;margin:36px 0}
.author .avatar{width:62px;height:62px;border-radius:50%;flex:0 0 auto;background:linear-gradient(135deg,var(--mint),var(--cyan));
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.4rem;color:#06231b}
.author h4{margin:0 0 3px;font-size:1.05rem}
.author .role{font-size:.85rem;color:var(--mint);margin-bottom:8px;font-weight:600}
.author p{font-size:.9rem;margin:0;color:var(--txt-2)}

/* ---------- Related / next links ---------- */
.related{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:30px 0}
.related a{display:block;background:var(--bg-2);border:1px solid var(--line);border-radius:12px;padding:18px;color:var(--txt);transition:.18s}
.related a:hover{border-color:var(--mint);transform:translateY(-3px)}
.related a .t{font-weight:700;font-size:.98rem;margin-bottom:4px;display:block}
.related a .d{font-size:.84rem;color:var(--txt-3)}

/* ---------- FAQ ---------- */
.faq details{border:1px solid var(--line);border-radius:12px;background:var(--bg-2);margin-bottom:12px;overflow:hidden}
.faq summary{padding:18px 22px;font-weight:700;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:14px;color:var(--txt)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.4rem;color:var(--mint);transition:transform .2s;flex:0 0 auto}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq .a{padding:16px 22px 20px;color:var(--txt-2)}
.faq .a p:last-child{margin-bottom:0}

/* ---------- Ad slot ---------- */
.ad-slot{margin:34px auto;min-height:90px;display:flex;align-items:center;justify-content:center;
  border:1px dashed var(--line);border-radius:12px;color:var(--txt-3);font-size:.78rem;letter-spacing:.05em;max-width:728px}

/* ---------- Section helpers ---------- */
section{padding:34px 0}
.sec-head{text-align:center;max-width:640px;margin:0 auto 36px}
.sec-head h2{margin-top:0}
.sec-head p{color:var(--txt-2)}

/* ---------- Disclaimer ---------- */
.disclaimer{background:rgba(255,93,108,.05);border:1px solid rgba(255,93,108,.2);border-radius:12px;padding:16px 20px;font-size:.86rem;color:var(--txt-2);margin:30px 0}
.disclaimer strong{color:var(--red)}

/* ---------- Footer ---------- */
footer.site{border-top:1px solid var(--line);margin-top:60px;padding:48px 0 30px;background:var(--bg-2)}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px;margin-bottom:34px}
.foot-grid h5{font-size:.78rem;text-transform:uppercase;letter-spacing:.07em;color:var(--txt-3);margin:0 0 14px}
.foot-grid a{display:block;color:var(--txt-2);font-size:.92rem;margin-bottom:9px}
.foot-grid a:hover{color:var(--mint)}
.foot-about{color:var(--txt-3);font-size:.9rem;max-width:280px}
.foot-bottom{border-top:1px solid var(--line);padding-top:22px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--txt-3);font-size:.84rem}

/* ---------- SVG diagram ---------- */
.diagram{background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin:24px 0}
.diagram svg{width:100%;height:auto;display:block}
.diagram figcaption{text-align:center;font-size:.85rem;color:var(--txt-3);margin-top:14px}

/* ---------- Calculator ---------- */
.calc{background:linear-gradient(180deg,#0d1322,#0a0f1b);border:1px solid var(--line-2);border-radius:18px;padding:26px;box-shadow:0 24px 60px -38px rgba(0,0,0,.85)}
.calc-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.calc-out{margin-top:22px;background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:20px;display:grid;grid-template-columns:repeat(3,1fr);gap:14px;text-align:center}
.calc-out .v{font-family:var(--mono);font-size:1.5rem;font-weight:700;color:var(--mint)}
.calc-out .v.neg{color:var(--red)}
.calc-out .k{font-size:.72rem;color:var(--txt-3);text-transform:uppercase;letter-spacing:.05em;margin-top:5px}

/* ---------- Responsive ---------- */
@media(max-width:880px){
  .g4,.g3{grid-template-columns:repeat(2,1fr)}
  .statgrid{grid-template-columns:repeat(2,1fr)}
  .bt-controls{grid-template-columns:repeat(2,1fr)}
  .bt-results{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
  .related{grid-template-columns:1fr}
  .toc ol{columns:1}
  .calc-row{grid-template-columns:1fr}
  .calc-out{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:640px){
  body{font-size:16px}
  .nav-links{position:fixed;inset:66px 0 auto 0;flex-direction:column;background:var(--bg-2);border-bottom:1px solid var(--line);
    padding:14px 22px;gap:4px;display:none;align-items:stretch}
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 14px}
  .nav-toggle{display:flex}
  .g2,.g4,.g3{grid-template-columns:1fr}
  .bt-controls,.bt-results,.calc-out{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr}
  .hero{padding:48px 0 24px}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

/* ---------- Adsterra ad units (centered, overflow-safe) ---------- */
.ad-zone{margin:34px auto;width:100%;max-width:100%;overflow-x:auto;text-align:center;
  display:flex;justify-content:center;align-items:center}
.ad-zone>*{max-width:100%}
.ad-728{min-height:90px}
.ad-728 iframe{max-width:100%}
.ad-300{min-height:250px}
.ad-native{display:block;max-width:728px;text-align:left}
.ad-native>div{margin:0 auto}