/* ============================================================
   399BET (399bet.icu) — Imperial Ruby & Platinum design system
   Self-contained, namespace .rb-  | Bengali (Hind Siliguri) + Sora
   ============================================================ */
:root{
  --bg:#120810;            /* warm plum-black base */
  --bg-2:#1a0d16;          /* raised */
  --surface:#22121d;       /* card */
  --surface-2:#2b1726;     /* card hover / inset */
  --brand:#e11d3f;         /* ruby */
  --brand-2:#ff3d7f;       /* magenta highlight (gradient end) */
  --brand-deep:#9f0f2e;    /* deep ruby */
  --gold:#e8c777;          /* champagne accent (numbers/prices) */
  --gold-2:#f3d89e;
  --emerald:#37d39b;       /* sparse positive accent */
  --text:#f7eef1;          /* platinum off-white */
  --muted:#cdb0bb;         /* muted rose-gray (AA on dark) */
  --faint:#9a8089;
  --line:rgba(255,255,255,.09);
  --line-2:rgba(255,255,255,.14);
  --ring:rgba(225,29,63,.45);
  --shadow:0 18px 48px -18px rgba(0,0,0,.75);
  --shadow-brand:0 14px 38px -12px rgba(225,29,63,.5);
  --radius:16px;
  --radius-sm:11px;
  --radius-lg:26px;
  --maxw:1180px;
  --ff-body:"Hind Siliguri",system-ui,"Segoe UI",sans-serif;
  --ff-disp:"Sora",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--ff-body);font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
/* subtle radial ambiance */
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(820px 460px at 84% -8%,rgba(225,29,63,.16),transparent 60%),
    radial-gradient(720px 520px at 6% 4%,rgba(255,61,127,.10),transparent 58%),
    radial-gradient(900px 700px at 50% 118%,rgba(159,15,46,.14),transparent 60%);
}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{line-height:1.32;margin:0 0 .55em;font-weight:700;letter-spacing:.1px}
p{margin:0 0 1.05em}
.rb-wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.rb-num{font-family:var(--ff-disp);font-variant-numeric:tabular-nums}

/* ---------- buttons ---------- */
.rb-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font-family:var(--ff-body);font-weight:700;font-size:1rem;line-height:1;
  padding:15px 26px;border-radius:999px;border:0;cursor:pointer;
  min-height:48px;transition:transform .18s ease,box-shadow .18s ease,filter .18s ease;
}
.rb-btn svg{width:1.15em;height:1.15em;flex:0 0 auto}
.rb-btn-primary{
  color:#fff;background:linear-gradient(120deg,var(--brand),var(--brand-2));
  box-shadow:var(--shadow-brand);
}
.rb-btn-primary:hover{transform:translateY(-2px);filter:saturate(1.08) brightness(1.04)}
.rb-btn-ghost{
  color:var(--text);background:rgba(255,255,255,.04);
  border:1px solid var(--line-2);
}
.rb-btn-ghost:hover{background:rgba(255,255,255,.08);transform:translateY(-2px)}
.rb-btn-gold{color:#2a1206;background:linear-gradient(120deg,var(--gold),var(--gold-2));font-weight:700}
.rb-btn-gold:hover{transform:translateY(-2px);filter:brightness(1.05)}
.rb-btn-lg{padding:18px 34px;font-size:1.08rem;min-height:56px}

/* ---------- header ---------- */
.rb-header{position:sticky;top:0;z-index:50;
  background:rgba(18,8,16,.82);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.rb-headin{display:flex;align-items:center;gap:18px;height:70px}
.rb-logo{display:flex;align-items:center;gap:11px;font-family:var(--ff-disp);font-weight:800;font-size:1.42rem;letter-spacing:.4px;color:#fff}
.rb-logo b{color:var(--brand)}
.rb-logo .rb-spark{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:grid;place-items:center;box-shadow:0 6px 16px -6px var(--brand)}
.rb-logo .rb-spark svg{width:18px;height:18px;color:#fff}
.rb-nav{margin-inline-start:auto;display:flex;align-items:center;gap:6px}
.rb-nav a{padding:9px 14px;border-radius:10px;color:var(--muted);font-weight:600;font-size:.98rem;transition:color .15s,background .15s}
.rb-nav a:hover,.rb-nav a.is-active{color:var(--text);background:rgba(255,255,255,.06)}
.rb-nav .rb-cta{margin-inline-start:8px}
/* mobile menu (CSS only) */
.rb-mtoggle,.rb-mlabel{display:none}
@media(max-width:900px){
  .rb-nav{position:fixed;inset:70px 0 auto 0;flex-direction:column;align-items:stretch;gap:2px;
    background:var(--bg-2);border-bottom:1px solid var(--line);padding:12px 18px 20px;
    transform:translateY(-130%);transition:transform .28s ease;margin:0;box-shadow:var(--shadow)}
  .rb-nav a{padding:13px 12px;font-size:1.05rem}
  .rb-nav .rb-cta{margin:8px 0 0}
  .rb-mtoggle:checked ~ .rb-nav{transform:translateY(0)}
  .rb-mlabel{display:grid;place-items:center;margin-inline-start:auto;width:46px;height:46px;border-radius:11px;border:1px solid var(--line-2);cursor:pointer}
  .rb-mlabel span,.rb-mlabel span::before,.rb-mlabel span::after{content:"";display:block;width:22px;height:2px;background:var(--text);border-radius:2px;position:relative;transition:.25s}
  .rb-mlabel span::before{position:absolute;top:-7px}
  .rb-mlabel span::after{position:absolute;top:7px}
  .rb-mtoggle:checked ~ .rb-mlabel span{background:transparent}
  .rb-mtoggle:checked ~ .rb-mlabel span::before{top:0;transform:rotate(45deg)}
  .rb-mtoggle:checked ~ .rb-mlabel span::after{top:0;transform:rotate(-45deg)}
}

/* ---------- section scaffolding ---------- */
.rb-sec{padding:64px 0}
.rb-sec-tight{padding:44px 0}
.rb-eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--ff-disp);font-weight:600;
  font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--gold);
  background:rgba(232,199,119,.10);border:1px solid rgba(232,199,119,.28);padding:6px 13px;border-radius:999px;margin-bottom:16px}
.rb-h2{font-size:clamp(1.5rem,3.4vw,2.15rem)}
.rb-sub{color:var(--muted);max-width:62ch;font-size:1.05rem}
.rb-center{text-align:center}
.rb-center .rb-sub{margin-inline:auto}

/* ---------- hero ---------- */
.rb-hero{position:relative;padding:70px 0 56px;overflow:hidden}
.rb-hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:46px;align-items:center}
.rb-hero h1{font-size:clamp(2rem,5.2vw,3.35rem);line-height:1.18;margin-bottom:.4em}
.rb-hero h1 .g{background:linear-gradient(110deg,var(--brand-2),var(--gold));-webkit-background-clip:text;background-clip:text;color:transparent}
.rb-hero-lead{font-size:1.12rem;color:var(--muted);margin-bottom:26px}
.rb-hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:26px}
.rb-trust{display:flex;flex-wrap:wrap;gap:18px 26px;color:var(--muted);font-size:.92rem;font-weight:600}
.rb-trust span{display:inline-flex;align-items:center;gap:8px}
.rb-trust svg{width:18px;height:18px;color:var(--emerald)}
/* hero promo card */
.rb-promocard{position:relative;background:linear-gradient(165deg,var(--surface-2),var(--surface));
  border:1px solid var(--line-2);border-radius:var(--radius-lg);padding:30px 28px;box-shadow:var(--shadow);overflow:hidden}
.rb-promocard::before{content:"";position:absolute;inset:-40% 40% auto -20%;height:200px;background:radial-gradient(closest-side,rgba(255,61,127,.35),transparent);filter:blur(8px)}
.rb-promocard .rb-tag{position:relative;display:inline-block;font-family:var(--ff-disp);font-weight:700;font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;color:#2a1206;background:linear-gradient(120deg,var(--gold),var(--gold-2));padding:5px 11px;border-radius:7px;margin-bottom:16px}
.rb-promocard h3{position:relative;font-size:1.18rem;margin-bottom:6px}
.rb-promocard .rb-big{position:relative;font-family:var(--ff-disp);font-weight:800;font-size:clamp(2.2rem,6vw,3rem);line-height:1;color:var(--gold);text-shadow:0 2px 18px rgba(232,199,119,.25);margin:6px 0 4px}
.rb-promocard p{position:relative;color:var(--muted);font-size:.96rem;margin-bottom:18px}
.rb-promocard .rb-btn{position:relative;width:100%}
.rb-banner-img{margin-top:18px;border-radius:14px;border:1px solid var(--line);box-shadow:var(--shadow)}

/* ---------- feature grid ---------- */
.rb-features{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.rb-feat{background:linear-gradient(180deg,var(--surface),var(--bg-2));border:1px solid var(--line);
  border-radius:var(--radius);padding:24px 20px;transition:transform .2s,border-color .2s,box-shadow .2s}
.rb-feat:hover{transform:translateY(-4px);border-color:rgba(225,29,63,.4);box-shadow:var(--shadow)}
.rb-feat-ic{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;margin-bottom:14px;
  background:radial-gradient(120% 120% at 30% 20%,rgba(225,29,63,.28),rgba(255,61,127,.10));border:1px solid rgba(225,29,63,.3)}
.rb-feat-ic svg{width:23px;height:23px;color:var(--brand-2)}
.rb-feat h3{font-size:1.05rem;margin-bottom:6px}
.rb-feat p{color:var(--muted);font-size:.94rem;margin:0}

/* ---------- prose band ---------- */
.rb-band{background:linear-gradient(180deg,var(--bg-2),var(--bg));border-block:1px solid var(--line)}
.rb-prose{color:var(--text)}
.rb-prose h2{font-size:clamp(1.4rem,3vw,1.95rem);margin-top:1.4em;position:relative;padding-inline-start:16px}
.rb-prose h2::before{content:"";position:absolute;inset-inline-start:0;top:.18em;bottom:.18em;width:5px;border-radius:3px;background:linear-gradient(var(--brand),var(--brand-2))}
.rb-prose h3{font-size:1.18rem;margin-top:1.3em;color:var(--gold-2)}
.rb-prose p,.rb-prose li{color:#e7d8de;font-size:1.04rem}
.rb-prose a{color:var(--brand-2);font-weight:600;text-decoration:underline;text-underline-offset:3px}
.rb-prose a:hover{color:var(--gold)}
.rb-prose ul,.rb-prose ol{padding-inline-start:1.3em;margin:0 0 1.1em}
.rb-prose li{margin-bottom:.45em}
.rb-prose strong{color:var(--text)}
.rb-prose blockquote{margin:1.2em 0;padding:14px 20px;border-inline-start:4px solid var(--brand);
  background:rgba(225,29,63,.07);border-radius:8px;color:var(--muted)}
.rb-prose img{margin:1.4em auto;border-radius:14px;border:1px solid var(--line)}
.rb-prose table{width:100%;border-collapse:collapse;margin:1.4em 0;font-size:.97rem;overflow:hidden;border-radius:12px;border:1px solid var(--line)}
.rb-prose th,.rb-prose td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:start}
.rb-prose th{background:rgba(225,29,63,.16);color:var(--text);font-weight:700}
.rb-prose tr:nth-child(even) td{background:rgba(255,255,255,.025)}

/* ---------- promotions ---------- */
.rb-promos{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.rb-promo{position:relative;background:linear-gradient(160deg,var(--surface-2),var(--surface));
  border:1px solid var(--line-2);border-radius:var(--radius);padding:26px 24px;overflow:hidden}
.rb-promo::after{content:"";position:absolute;width:140px;height:140px;right:-50px;top:-50px;border-radius:50%;background:radial-gradient(closest-side,rgba(232,199,119,.22),transparent)}
.rb-promo .rb-amt{font-family:var(--ff-disp);font-weight:800;font-size:1.9rem;color:var(--gold);line-height:1;margin:2px 0 8px}
.rb-promo h3{font-size:1.12rem;margin-bottom:6px}
.rb-promo p{color:var(--muted);font-size:.96rem;margin:0}

/* ---------- game tiles ---------- */
.rb-tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.rb-tile{position:relative;display:flex;flex-direction:column;gap:8px;padding:22px 20px;border-radius:var(--radius);
  background:linear-gradient(180deg,var(--surface),var(--bg-2));border:1px solid var(--line);transition:transform .2s,border-color .2s}
.rb-tile:hover{transform:translateY(-4px);border-color:rgba(225,29,63,.4)}
.rb-tile-ic{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;background:rgba(255,61,127,.12);border:1px solid rgba(255,61,127,.25)}
.rb-tile-ic svg{width:22px;height:22px;color:var(--brand-2)}
.rb-tile b{font-size:1.05rem}
.rb-tile span{color:var(--muted);font-size:.92rem}

/* ---------- CTA band ---------- */
.rb-ctaband{position:relative;text-align:center;border-radius:var(--radius-lg);overflow:hidden;
  padding:54px 24px;background:linear-gradient(120deg,var(--brand-deep),var(--brand) 55%,var(--brand-2));box-shadow:var(--shadow-brand)}
.rb-ctaband::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 200px at 50% -30%,rgba(255,255,255,.25),transparent)}
.rb-ctaband h2{position:relative;color:#fff;font-size:clamp(1.6rem,3.6vw,2.3rem)}
.rb-ctaband p{position:relative;color:rgba(255,255,255,.92);max-width:54ch;margin:0 auto 22px}
.rb-ctaband .rb-btn{position:relative}

/* ---------- article layout ---------- */
.rb-crumb{color:var(--faint);font-size:.88rem;margin:22px 0 0}
.rb-crumb a:hover{color:var(--brand-2)}
.rb-art{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:40px;align-items:start;padding:22px 0 64px}
.rb-art-main{min-width:0}
.rb-chip{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--brand-2);background:rgba(225,29,63,.12);border:1px solid rgba(225,29,63,.3);padding:5px 11px;border-radius:999px;margin-bottom:14px}
.rb-art h1{font-size:clamp(1.7rem,4vw,2.5rem);line-height:1.22;margin-bottom:14px}
.rb-meta{display:flex;flex-wrap:wrap;gap:8px 18px;color:var(--faint);font-size:.9rem;margin-bottom:24px;align-items:center}
.rb-meta .rb-av{display:inline-flex;align-items:center;gap:8px}
.rb-meta .rb-av i{width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:inline-grid;place-items:center;color:#fff;font-style:normal;font-weight:700;font-family:var(--ff-disp);font-size:.8rem}
.rb-hero-figure{margin:0 0 26px;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.rb-toc{background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;margin:0 0 26px}
.rb-toc b{display:block;font-family:var(--ff-disp);font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;color:var(--gold);margin-bottom:10px}
.rb-toc ol{margin:0;padding-inline-start:1.1em;color:var(--muted)}
.rb-toc a{color:var(--muted)}
.rb-toc a:hover{color:var(--brand-2)}
.rb-aside{position:sticky;top:90px;display:flex;flex-direction:column;gap:18px}
.rb-card{background:linear-gradient(165deg,var(--surface-2),var(--surface));border:1px solid var(--line-2);border-radius:var(--radius);padding:24px 22px}
.rb-card .rb-tag{display:inline-block;font-family:var(--ff-disp);font-weight:700;font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:#2a1206;background:linear-gradient(120deg,var(--gold),var(--gold-2));padding:4px 10px;border-radius:6px;margin-bottom:12px}
.rb-card h4{font-size:1.1rem;margin-bottom:6px}
.rb-card p{color:var(--muted);font-size:.94rem;margin-bottom:16px}
.rb-card .rb-btn{width:100%}
.rb-inline-cta{margin:30px 0;padding:24px;border-radius:var(--radius);background:linear-gradient(120deg,rgba(225,29,63,.14),rgba(255,61,127,.07));border:1px solid rgba(225,29,63,.3);display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between}
.rb-inline-cta b{font-size:1.1rem}
.rb-inline-cta span{color:var(--muted);font-size:.95rem;display:block}

/* ---------- blog list ---------- */
.rb-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.rb-pcard{display:flex;flex-direction:column;background:linear-gradient(180deg,var(--surface),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform .2s,border-color .2s,box-shadow .2s}
.rb-pcard:hover{transform:translateY(-5px);border-color:rgba(225,29,63,.4);box-shadow:var(--shadow)}
.rb-pcard-thumb{aspect-ratio:16/9;position:relative;overflow:hidden;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--brand-deep),var(--surface-2));border-bottom:1px solid var(--line)}
.rb-pcard-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.rb-pcard-thumb .rb-ph{width:54px;height:54px;color:rgba(255,255,255,.55)}
.rb-pcard-body{padding:20px 20px 22px;display:flex;flex-direction:column;flex:1}
.rb-pcard .rb-chip{margin-bottom:11px}
.rb-pcard h3{font-size:1.08rem;line-height:1.4;margin-bottom:8px}
.rb-pcard h3 a:hover{color:var(--brand-2)}
.rb-pcard p{color:var(--muted);font-size:.93rem;margin:0 0 16px}
.rb-pcard .rb-read{margin-top:auto;color:var(--brand-2);font-weight:700;font-size:.92rem;display:inline-flex;align-items:center;gap:6px}
.rb-read{display:inline-flex;align-items:center;gap:6px}
.rb-read svg{width:1.05em;height:1.05em;flex:0 0 auto}
.rb-crumb svg{width:1em;height:1em}

/* ---------- footer ---------- */
.rb-footer{background:var(--bg-2);border-top:1px solid var(--line);padding:52px 0 26px;margin-top:20px}
.rb-fgrid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:40px}
.rb-footer .rb-logo{margin-bottom:14px}
.rb-fabout{color:var(--muted);font-size:.95rem;max-width:42ch}
.rb-fcol b{display:block;font-family:var(--ff-disp);font-size:.78rem;letter-spacing:.13em;text-transform:uppercase;color:var(--gold);margin-bottom:14px}
.rb-fcol a{display:block;color:var(--muted);padding:5px 0;font-size:.96rem}
.rb-fcol a:hover{color:var(--text)}
.rb-18{display:inline-flex;align-items:center;gap:8px;margin-top:16px;color:var(--muted);font-size:.9rem}
.rb-18 b{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--brand);color:#fff;font-family:var(--ff-disp);font-size:.74rem;font-weight:800}
.rb-fbot{border-top:1px solid var(--line);margin-top:34px;padding-top:22px;color:var(--faint);font-size:.86rem;display:flex;flex-wrap:wrap;gap:10px 20px;justify-content:space-between}

/* ---------- responsive ---------- */
@media(max-width:980px){
  .rb-features{grid-template-columns:repeat(2,1fr)}
  .rb-art{grid-template-columns:1fr}
  .rb-aside{position:static;flex-direction:row;flex-wrap:wrap}
  .rb-aside>*{flex:1 1 260px}
  .rb-grid{grid-template-columns:repeat(2,1fr)}
  .rb-tiles{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:760px){
  .rb-hero-grid{grid-template-columns:1fr;gap:30px}
  .rb-promos{grid-template-columns:1fr}
  .rb-fgrid{grid-template-columns:1fr;gap:30px}
  .rb-sec{padding:48px 0}
}
@media(max-width:560px){
  .rb-features,.rb-grid,.rb-tiles{grid-template-columns:1fr}
  .rb-hero-cta .rb-btn{width:100%}
}