/* =========================================================================
   TradeBTC — unified dark design system
   ========================================================================= */
:root{
  --bg:#0b0e14;
  --bg-2:#111624;
  --panel:#151b2b;
  --panel-2:#1b2233;
  --border:rgba(255,255,255,.08);
  --border-strong:rgba(120,160,255,.28);
  --text:#e7ebf3;
  --muted:#93a0b8;
  --faint:#5f6c85;
  --brand:#3b82f6;
  --brand-2:#60a5fa;
  --accent:#f7931a;         /* bitcoin orange */
  --green:#22c55e;
  --green-soft:rgba(34,197,94,.12);
  --red:#ef4444;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 10px 40px -12px rgba(0,0,0,.6);
  --maxw:1240px;
  --font:'Sora',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:
    radial-gradient(1100px 600px at 80% -10%,rgba(59,130,246,.14),transparent 60%),
    radial-gradient(900px 500px at 0% 0%,rgba(247,147,26,.08),transparent 55%),
    var(--bg);
  color:var(--text);
  line-height:1.6;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand-2);text-decoration:none}
a:hover{color:#93c5fd}
img{max-width:100%;height:auto}
.container{max-width:var(--maxw);margin:0 auto;padding:0 1.1rem}
.section{padding:2.6rem 0}
.muted{color:var(--muted)}
.faint{color:var(--faint)}
.center{text-align:center}
.mt-1{margin-top:.5rem}.mt-2{margin-top:1rem}.mt-3{margin-top:1.6rem}.mt-4{margin-top:2.4rem}
.mb-2{margin-bottom:1rem}.mb-3{margin-bottom:1.6rem}
.grad-text{
  background:linear-gradient(120deg,#fff 0%,#a8d5ff 60%,#7bb8ff 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;top:0;z-index:200;
  background:rgba(11,14,20,.82);
  backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid var(--border);
}
.nav{display:flex;align-items:center;gap:1rem;height:64px}
.brand{display:flex;align-items:center;gap:.55rem;font-weight:700;font-size:1.2rem;color:#fff}
.brand .logo{
  width:34px;height:34px;border-radius:9px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--accent),#ffb454);color:#111;font-weight:800;font-size:1.15rem;
  box-shadow:0 6px 18px -6px rgba(247,147,26,.6);
}
.nav-links{display:flex;align-items:center;gap:.35rem;margin-left:auto}
.nav-links a{
  color:var(--muted);font-size:.95rem;font-weight:500;padding:.5rem .8rem;border-radius:8px;
  transition:.15s;
}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.05)}
.nav-links a.active{color:#fff;background:rgba(59,130,246,.16)}
.nav-cta{
  background:linear-gradient(135deg,var(--brand),#2563eb)!important;color:#fff!important;
  box-shadow:0 6px 18px -8px rgba(59,130,246,.8);
}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--border);color:#fff;
  width:42px;height:40px;border-radius:9px;font-size:1.2rem;cursor:pointer}
@media(max-width:900px){
  .nav-toggle{display:block}
  .nav-links{
    position:absolute;top:64px;left:0;right:0;flex-direction:column;align-items:stretch;
    background:var(--bg-2);border-bottom:1px solid var(--border);padding:.6rem;gap:.2rem;
    display:none;margin-left:0;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:.7rem .9rem}
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;justify-content:center;
  font-family:inherit;font-weight:600;font-size:.95rem;cursor:pointer;
  padding:.7rem 1.3rem;border-radius:10px;border:1px solid transparent;transition:.15s;
}
.btn-primary{background:linear-gradient(135deg,var(--brand),#2563eb);color:#fff;
  box-shadow:0 8px 22px -10px rgba(59,130,246,.9)}
.btn-primary:hover{filter:brightness(1.08);color:#fff}
.btn-ghost{background:rgba(255,255,255,.04);border-color:var(--border);color:var(--text)}
.btn-ghost:hover{background:rgba(255,255,255,.08);color:#fff}
.btn-accent{background:linear-gradient(135deg,var(--accent),#ffb454);color:#151515}
.btn-accent:hover{filter:brightness(1.05);color:#151515}
.btn-lg{padding:.9rem 1.7rem;font-size:1.02rem}
.btn-block{width:100%}
.btn-danger{background:rgba(239,68,68,.14);border-color:rgba(239,68,68,.4);color:#fca5a5}
.btn-danger:hover{background:rgba(239,68,68,.22);color:#fff}

/* ---------- Cards / Panels ---------- */
.panel{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem}
.panel-glow{border-color:var(--border-strong);box-shadow:var(--shadow)}
.card{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--border);border-radius:var(--radius);padding:1.4rem;transition:.2s;
}
.card:hover{border-color:var(--border-strong);transform:translateY(-3px)}

/* ---------- Hero ---------- */
.hero{padding:3rem 0 1.5rem}
.hero h1{font-size:clamp(2rem,4.6vw,3.2rem);font-weight:800;line-height:1.1;letter-spacing:-1px}
.hero p.lead{color:var(--muted);font-size:1.12rem;max-width:640px;margin:1rem auto 0}
.hero.center p.lead{margin-left:auto;margin-right:auto}
.badge{
  display:inline-flex;align-items:center;gap:.4rem;font-size:.8rem;font-weight:600;
  padding:.35rem .8rem;border-radius:50px;background:rgba(59,130,246,.14);
  border:1px solid rgba(59,130,246,.3);color:#bfdbfe;
}
.live-dot{width:8px;height:8px;border-radius:50%;background:var(--green);
  box-shadow:0 0 0 0 rgba(34,197,94,.6);animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(34,197,94,.5)}70%{box-shadow:0 0 0 8px rgba(34,197,94,0)}100%{box-shadow:0 0 0 0 rgba(34,197,94,0)}}

/* ---------- Ticker / price badges ---------- */
.ticker{display:flex;flex-wrap:wrap;gap:.6rem;justify-content:center;margin-top:1.4rem}
.price-chip{
  display:flex;align-items:center;gap:.5rem;background:var(--panel-2);
  border:1px solid var(--border);border-radius:50px;padding:.5rem .95rem;font-size:.9rem;font-weight:600;
}
.price-chip .sym{color:var(--muted)}
.price-chip .val{color:#fff}

/* ---------- Stats grid ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.8rem;margin:1rem 0}
.stat{background:var(--panel-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:1rem;text-align:center}
.stat .label{color:var(--muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;font-weight:600}
.stat .value{color:#fff;font-size:1.25rem;font-weight:700;margin-top:.3rem}
.stat .src{color:var(--faint);font-size:.68rem;margin-top:.2rem}

/* ---------- Forms ---------- */
label.field-label{display:block;color:var(--text);font-weight:600;font-size:.85rem;margin-bottom:.4rem}
.input,select.input,textarea.input{
  width:100%;background:var(--bg-2);border:1px solid var(--border);color:var(--text);
  border-radius:10px;padding:.7rem .8rem;font-size:.95rem;font-family:inherit;transition:.15s;
}
.input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(59,130,246,.15);background:var(--panel-2)}
select.input{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2393a0b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .8rem center;padding-right:2rem}
.form-grid{display:grid;gap:1rem}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:640px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

/* ---------- Coin tabs ---------- */
.coin-tabs{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1.4rem}
.coin-tab{
  display:flex;align-items:center;gap:.5rem;padding:.6rem 1.1rem;border-radius:50px;cursor:pointer;
  background:var(--panel-2);border:1px solid var(--border);color:var(--muted);font-weight:600;font-size:.92rem;transition:.15s;
}
.coin-tab .ci{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-weight:800;color:#111;font-size:.8rem}
.coin-tab:hover{color:#fff;border-color:var(--border-strong)}
.coin-tab.active{background:rgba(59,130,246,.16);border-color:var(--brand);color:#fff}

/* ---------- Results ---------- */
.results{margin-top:1.6rem;border:1px solid rgba(34,197,94,.3);background:var(--green-soft);
  border-radius:var(--radius);padding:1.4rem}
.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.7rem;margin-top:1rem}
.result-item{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.06);border-radius:10px;padding:.9rem;text-align:center}
.result-item .rl{color:var(--muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.04em}
.result-item .rv{color:#86efac;font-size:1.15rem;font-weight:700;margin-top:.35rem}
.result-item.neg .rv{color:#fca5a5}
.result-item.big .rv{font-size:1.5rem}

/* ---------- Tables ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius)}
table.data{width:100%;border-collapse:collapse;font-size:.92rem;min-width:720px}
table.data th,table.data td{padding:.8rem 1rem;text-align:left;border-bottom:1px solid var(--border);white-space:nowrap}
table.data thead th{background:var(--panel-2);color:var(--muted);font-size:.76rem;text-transform:uppercase;
  letter-spacing:.05em;cursor:pointer;user-select:none;position:sticky;top:0}
table.data tbody tr:hover{background:rgba(255,255,255,.03)}
table.data td.num{text-align:right;font-variant-numeric:tabular-nums}
.pos{color:#86efac;font-weight:600}.negv{color:#fca5a5;font-weight:600}
.pill{display:inline-block;padding:.15rem .55rem;border-radius:50px;font-size:.72rem;font-weight:600;
  background:rgba(59,130,246,.16);color:#bfdbfe;border:1px solid rgba(59,130,246,.28)}

/* ---------- Sections / features ---------- */
.section-head{text-align:center;max-width:640px;margin:0 auto 1.8rem}
.section-head h2{font-size:clamp(1.6rem,3vw,2.2rem);font-weight:800;letter-spacing:-.5px}
.section-head p{color:var(--muted);margin-top:.6rem}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:1rem}
.feature .fi{width:44px;height:44px;border-radius:11px;display:grid;place-items:center;font-size:1.3rem;
  background:rgba(59,130,246,.14);border:1px solid rgba(59,130,246,.28);margin-bottom:.8rem}
.feature h3{font-size:1.08rem;margin-bottom:.35rem}
.feature p{color:var(--muted);font-size:.92rem}

/* ---------- Article / prose ---------- */
.prose{max-width:760px;margin:0 auto}
.prose h1{font-size:clamp(1.8rem,3.4vw,2.6rem);font-weight:800;letter-spacing:-.5px;margin-bottom:.4rem}
.prose h2{font-size:1.5rem;font-weight:700;margin:2rem 0 .8rem}
.prose h3{font-size:1.2rem;font-weight:700;margin:1.5rem 0 .6rem}
.prose p{color:#cdd6e6;margin-bottom:1rem}
.prose ul,.prose ol{color:#cdd6e6;margin:0 0 1rem 1.3rem}
.prose li{margin-bottom:.4rem}
.prose a{text-decoration:underline}
.prose blockquote{border-left:3px solid var(--brand);background:var(--panel);padding:.8rem 1.1rem;
  border-radius:0 10px 10px 0;margin:1.2rem 0;color:var(--muted)}
.byline{color:var(--faint);font-size:.9rem;margin-bottom:1.6rem}

/* ---------- Accordion (FAQ) ---------- */
.acc-item{border:1px solid var(--border);border-radius:10px;margin-bottom:.7rem;overflow:hidden;background:var(--panel)}
.acc-q{width:100%;text-align:left;background:none;border:none;color:#fff;font-family:inherit;font-weight:600;
  font-size:1rem;padding:1rem 1.2rem;cursor:pointer;display:flex;justify-content:space-between;gap:1rem}
.acc-q .chev{transition:.2s;color:var(--muted)}
.acc-item.open .chev{transform:rotate(180deg)}
.acc-a{max-height:0;overflow:hidden;transition:max-height .25s ease;color:var(--muted);padding:0 1.2rem}
.acc-item.open .acc-a{max-height:400px;padding:0 1.2rem 1.1rem}

/* ---------- Ad slot styling (Auto Ads reserve friendly) ---------- */
.ad-zone{margin:1.8rem auto;text-align:center;min-height:90px}
.ad-zone .ad-label{color:var(--faint);font-size:.65rem;text-transform:uppercase;letter-spacing:.1em;margin-bottom:.4rem}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--border);background:var(--bg-2);margin-top:3rem;padding:2.6rem 0 1.6rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.4fr;gap:2rem}
@media(max-width:800px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.footer-grid{grid-template-columns:1fr}}
.footer-grid h4{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:.9rem}
.footer-grid a{display:block;color:var(--faint);font-size:.92rem;padding:.22rem 0}
.footer-grid a:hover{color:#fff}
.footer-bottom{border-top:1px solid var(--border);margin-top:2rem;padding-top:1.3rem;text-align:center;
  color:var(--faint);font-size:.85rem}
.newsletter input{margin-bottom:.6rem}

/* ---------- Alerts ---------- */
.alert{padding:.9rem 1.1rem;border-radius:10px;margin-bottom:1rem;font-size:.95rem}
.alert-success{background:rgba(34,197,94,.12);border:1px solid rgba(34,197,94,.35);color:#86efac}
.alert-danger{background:rgba(239,68,68,.12);border:1px solid rgba(239,68,68,.35);color:#fca5a5}
.alert-info{background:rgba(59,130,246,.12);border:1px solid rgba(59,130,246,.35);color:#bfdbfe}

.hidden{display:none!important}
.text-green{color:#86efac}.text-red{color:#fca5a5}
.disclaimer{font-size:.82rem;color:var(--faint);border:1px dashed var(--border);border-radius:10px;padding:.9rem 1.1rem;margin-top:1.4rem}