/* ===========================================================================
   BNSM — Official Website  |  Wuxia / MMORPG theme
   Palette: ink-black + gold + crimson + jade | Fonts: Cinzel (Latin) + Be Vietnam Pro (VN)
   =========================================================================== */
:root{
  --bg:#0a0908; --bg2:#14110d; --surface:#1a1611; --surface2:#211b14; --line:rgba(202,162,74,.22);
  --gold:#caa24a; --gold-lt:#e6c879; --gold-dk:#9a7a2c; --gold-glow:rgba(202,162,74,.45);
  --crimson:#9b1c2e; --crimson-lt:#c0392b; --jade:#2f8f7d;
  --txt:#ece3d2; --muted:#a99d86; --dim:#7d735f;
  --maxw:1200px; --r:10px; --r-lg:16px;
  --grad-gold:linear-gradient(135deg,#e6c879 0%,#caa24a 45%,#9a7a2c 100%);
  --grad-dark:linear-gradient(180deg,rgba(10,9,8,.0) 0%,rgba(10,9,8,.55) 55%,rgba(10,9,8,.96) 100%);
  --shadow:0 18px 40px -16px rgba(0,0,0,.8);
  --ff-disp:'Cinzel',serif; --ff:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--ff); color:var(--txt); background:var(--bg); line-height:1.65;
  font-size:16px; -webkit-font-smoothing:antialiased; overflow-x:hidden;
  background-image:
    radial-gradient(1200px 600px at 80% -10%,rgba(155,28,46,.10),transparent 60%),
    radial-gradient(1000px 700px at -10% 20%,rgba(202,162,74,.07),transparent 60%);
}
img{max-width:100%;display:block}
a{color:var(--gold-lt);text-decoration:none;transition:.2s}
a:hover{color:var(--gold)}
ul{list-style:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}
section{position:relative}

/* --- typography --- */
h1,h2,h3,h4{line-height:1.2;font-weight:700}
.brand-font{font-family:var(--ff-disp);letter-spacing:.06em}
.gold-text{background:var(--grad-gold);-webkit-background-clip:text;background-clip:text;color:transparent}
.eyebrow{font-family:var(--ff-disp);letter-spacing:.32em;text-transform:uppercase;font-size:.72rem;color:var(--gold);font-weight:600}
.sec-head{text-align:center;max-width:760px;margin:0 auto 46px}
.sec-head h2{font-size:clamp(1.7rem,3.6vw,2.7rem);margin:10px 0 14px}
.sec-head p{color:var(--muted)}
.divider{display:flex;align-items:center;justify-content:center;gap:14px;margin:14px auto}
.divider::before,.divider::after{content:"";height:1px;width:64px;background:linear-gradient(90deg,transparent,var(--gold))}
.divider::after{background:linear-gradient(90deg,var(--gold),transparent)}
.divider span{color:var(--gold);font-size:1.1rem}

/* --- buttons --- */
.btn{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:.98rem;
  padding:14px 30px;border-radius:var(--r);cursor:pointer;border:1px solid transparent;
  transition:.22s;white-space:nowrap;position:relative;font-family:var(--ff)}
.btn-primary{background:var(--grad-gold);color:#231a07;box-shadow:0 8px 26px -10px var(--gold-glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 34px -10px var(--gold-glow);color:#1a1305}
.btn-ghost{background:rgba(202,162,74,.06);color:var(--gold-lt);border-color:var(--line)}
.btn-ghost:hover{background:rgba(202,162,74,.14);border-color:var(--gold);transform:translateY(-2px)}
.btn-crimson{background:linear-gradient(135deg,#c0392b,#9b1c2e);color:#fff;box-shadow:0 8px 26px -10px rgba(192,57,43,.5)}
.btn-crimson:hover{transform:translateY(-2px)}
.btn-lg{padding:17px 38px;font-size:1.06rem}
.btn .ic{width:18px;height:18px;fill:currentColor}

/* --- header / nav --- */
.site-header{position:fixed;inset:0 0 auto 0;z-index:60;transition:.3s;
  background:linear-gradient(180deg,rgba(10,9,8,.92),rgba(10,9,8,.55) 70%,transparent);
  backdrop-filter:blur(2px)}
.site-header.scrolled{background:rgba(10,9,8,.96);border-bottom:1px solid var(--line);box-shadow:0 6px 24px -12px #000}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:12px;font-family:var(--ff-disp);font-weight:900;font-size:1.5rem;letter-spacing:.08em}
.logo img{width:40px;height:40px;border-radius:8px;border:1px solid var(--line)}
.logo .sub{font-family:var(--ff);font-size:.6rem;letter-spacing:.28em;color:var(--muted);font-weight:600;text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{color:var(--txt);font-weight:500;font-size:.95rem;padding:9px 14px;border-radius:8px;position:relative}
.nav-links a:hover,.nav-links a.active{color:var(--gold-lt);background:rgba(202,162,74,.07)}
.nav-links a.active::after{content:"";position:absolute;left:14px;right:14px;bottom:3px;height:2px;background:var(--grad-gold);border-radius:2px}
.nav-cta{display:flex;align-items:center;gap:10px}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;width:44px;height:44px;cursor:pointer;color:var(--gold)}
.nav-toggle svg{width:24px;height:24px;stroke:currentColor;fill:none;stroke-width:2}

/* --- hero --- */
.hero{min-height:100vh;display:flex;align-items:center;position:relative;overflow:hidden;padding:120px 0 70px}
.hero-bg{position:absolute;inset:0;z-index:0;background:url('../img/hero-bg.jpg') center/cover no-repeat;transform:scale(1.05)}
.hero-bg::after{content:"";position:absolute;inset:0;background:
  var(--grad-dark),linear-gradient(90deg,rgba(10,9,8,.92) 0%,rgba(10,9,8,.45) 55%,transparent 100%)}
.hero-particles{position:absolute;inset:0;z-index:1;background:
  radial-gradient(2px 2px at 20% 30%,rgba(230,200,121,.6),transparent),
  radial-gradient(2px 2px at 70% 60%,rgba(230,200,121,.4),transparent),
  radial-gradient(1px 1px at 45% 80%,rgba(230,200,121,.5),transparent),
  radial-gradient(1px 1px at 85% 25%,rgba(192,57,43,.5),transparent);
  animation:float 14s ease-in-out infinite}
@keyframes float{50%{transform:translateY(-14px)}}
.hero-inner{position:relative;z-index:2;max-width:680px}
.hero h1{font-size:clamp(2.4rem,6vw,4.6rem);line-height:1.05;margin:18px 0;font-family:var(--ff-disp);font-weight:900}
.hero h1 .sub-title{display:block;font-family:var(--ff);font-size:clamp(1rem,2.4vw,1.5rem);font-weight:600;color:var(--txt);letter-spacing:.02em;margin-top:8px}
.hero .lead{font-size:1.12rem;color:#d9cfbb;max-width:560px;margin-bottom:14px}
.hero .tagline{font-style:italic;color:var(--gold-lt);font-size:1.05rem;margin-bottom:26px;border-left:3px solid var(--gold);padding-left:14px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:30px}
.hero-meta{display:flex;gap:26px;flex-wrap:wrap;color:var(--muted);font-size:.88rem}
.hero-meta b{color:var(--gold-lt);display:block;font-size:1.3rem;font-family:var(--ff-disp)}
.scroll-cue{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);z-index:2;color:var(--muted);font-size:.75rem;letter-spacing:.2em;text-align:center;animation:float 2.4s ease-in-out infinite}

/* --- generic section spacing --- */
.section{padding:84px 0}
.section-alt{background:linear-gradient(180deg,var(--bg),var(--bg2) 50%,var(--bg))}
.ornament-top{height:2px;background:linear-gradient(90deg,transparent,var(--gold-dk),var(--gold),var(--gold-dk),transparent);opacity:.5}

/* --- intro / world --- */
.intro-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center}
.intro-text h2{font-size:clamp(1.6rem,3.4vw,2.5rem);margin-bottom:16px}
.intro-text p{color:var(--muted);margin-bottom:14px}
.intro-media{position:relative;border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow)}
.intro-media img{width:100%;aspect-ratio:16/10;object-fit:cover}
.intro-media .frame-glow{position:absolute;inset:0;box-shadow:inset 0 0 60px rgba(202,162,74,.18);pointer-events:none}

/* --- features --- */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feat-card{background:linear-gradient(180deg,var(--surface),var(--surface2));border:1px solid var(--line);
  border-radius:var(--r-lg);padding:28px 24px;transition:.25s;position:relative;overflow:hidden}
.feat-card::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:var(--grad-gold);transform:scaleX(0);transform-origin:left;transition:.3s}
.feat-card:hover{transform:translateY(-6px);border-color:rgba(202,162,74,.5);box-shadow:var(--shadow)}
.feat-card:hover::before{transform:scaleX(1)}
.feat-ic{width:54px;height:54px;border-radius:12px;display:grid;place-items:center;margin-bottom:16px;
  background:radial-gradient(circle at 30% 30%,rgba(202,162,74,.25),rgba(202,162,74,.05));border:1px solid var(--line)}
.feat-ic svg{width:28px;height:28px;fill:var(--gold-lt)}
.feat-card h3{font-size:1.18rem;margin-bottom:8px;color:var(--txt)}
.feat-card p{color:var(--muted);font-size:.94rem}

/* --- gallery --- */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gallery figure{position:relative;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);aspect-ratio:16/9;cursor:pointer}
.gallery img{width:100%;height:100%;object-fit:cover;transition:.4s}
.gallery figure:hover img{transform:scale(1.08)}
.gallery figcaption{position:absolute;inset:auto 0 0 0;padding:14px;font-size:.85rem;font-weight:600;
  background:linear-gradient(transparent,rgba(10,9,8,.9));color:var(--txt)}
.gallery .tag{position:absolute;top:10px;left:10px;font-size:.68rem;font-weight:700;letter-spacing:.06em;
  background:rgba(155,28,46,.85);color:#fff;padding:4px 10px;border-radius:20px;text-transform:uppercase}

/* --- CTA band --- */
.cta-band{padding:70px 0;text-align:center;position:relative;overflow:hidden;
  background:linear-gradient(135deg,rgba(155,28,46,.18),rgba(202,162,74,.10)),var(--bg2);border-block:1px solid var(--line)}
.cta-band h2{font-size:clamp(1.8rem,4vw,2.8rem);margin-bottom:12px}
.cta-band p{color:var(--muted);max-width:560px;margin:0 auto 26px}
.cta-band .hero-cta{justify-content:center}

/* --- footer --- */
.site-footer{background:#080706;border-top:1px solid var(--line);padding:56px 0 26px;color:var(--muted)}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:34px;margin-bottom:34px}
.foot-grid h4{color:var(--gold-lt);font-size:.95rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:14px}
.foot-grid a{color:var(--muted);display:block;padding:5px 0;font-size:.92rem}
.foot-grid a:hover{color:var(--gold-lt)}
.foot-about p{font-size:.92rem;margin-top:12px;max-width:300px}
.foot-bottom{border-top:1px solid var(--line);padding-top:22px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:.84rem}
.foot-bottom .note{color:var(--dim)}

/* --- page banner (sub-pages) --- */
.page-banner{padding:140px 0 56px;text-align:center;position:relative;border-bottom:1px solid var(--line);
  background:linear-gradient(rgba(10,9,8,.78),rgba(10,9,8,.92)),url('../img/g2_thegioi.jpg') center/cover}
.page-banner h1{font-size:clamp(2rem,5vw,3.2rem);font-family:var(--ff-disp);font-weight:900}
.page-banner .crumb{color:var(--muted);font-size:.88rem;margin-top:10px}
.page-banner .crumb a{color:var(--gold-lt)}

/* --- download page --- */
.dl-card{max-width:760px;margin:0 auto;background:linear-gradient(180deg,var(--surface),var(--surface2));
  border:1px solid var(--line);border-radius:var(--r-lg);padding:36px;box-shadow:var(--shadow);text-align:center}
.dl-card .ver{font-family:var(--ff-disp);font-size:1.4rem;color:var(--gold-lt)}
.dl-meta{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:24px 0;text-align:left}
.dl-meta div{background:rgba(202,162,74,.05);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px}
.dl-meta span{display:block;color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.08em}
.dl-meta b{color:var(--txt);font-size:1rem;word-break:break-all}
.hashbox{font-family:ui-monospace,monospace;font-size:.78rem;color:var(--muted);background:#0d0b09;border:1px solid var(--line);border-radius:8px;padding:10px 12px;word-break:break-all;margin-top:6px}
.steps{counter-reset:s;max-width:760px;margin:40px auto 0;display:grid;gap:16px}
.step{display:flex;gap:18px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px 22px}
.step::before{counter-increment:s;content:counter(s);flex:0 0 auto;width:40px;height:40px;border-radius:50%;
  background:var(--grad-gold);color:#231a07;font-weight:800;font-family:var(--ff-disp);display:grid;place-items:center}
.step h4{margin-bottom:4px}
.step p{color:var(--muted);font-size:.93rem}
.note-box{max-width:760px;margin:26px auto 0;background:rgba(155,28,46,.10);border:1px solid rgba(192,57,43,.4);
  border-radius:var(--r);padding:16px 20px;color:#e7c7b0;font-size:.92rem}
.note-box b{color:#f0b89e}

/* --- register form --- */
.form-wrap{max-width:480px;margin:0 auto;background:linear-gradient(180deg,var(--surface),var(--surface2));
  border:1px solid var(--line);border-radius:var(--r-lg);padding:34px;box-shadow:var(--shadow)}
.field{margin-bottom:18px}
.field label{display:block;font-size:.86rem;color:var(--muted);margin-bottom:7px;font-weight:600}
.field input{width:100%;background:#0d0b09;border:1px solid var(--line);border-radius:var(--r);padding:13px 15px;
  color:var(--txt);font-family:var(--ff);font-size:.96rem;transition:.2s}
.field input:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(202,162,74,.12)}
.field .hint{font-size:.78rem;color:var(--dim);margin-top:5px}
.form-msg{padding:13px 16px;border-radius:var(--r);font-size:.9rem;margin-bottom:18px;display:none}
.form-msg.show{display:block}
.form-msg.info{background:rgba(47,143,125,.12);border:1px solid rgba(47,143,125,.45);color:#9fe3d3}
.form-msg.warn{background:rgba(202,162,74,.10);border:1px solid var(--line);color:var(--gold-lt)}
.form-msg.err{background:rgba(192,57,43,.12);border:1px solid rgba(192,57,43,.45);color:#f0b0a4}
.form-msg.ok{background:rgba(47,143,125,.16);border:1px solid var(--jade);color:#b6f0e2}

/* --- news --- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.news-card{background:linear-gradient(180deg,var(--surface),var(--surface2));border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;transition:.25s;display:flex;flex-direction:column}
.news-card:hover{transform:translateY(-5px);border-color:rgba(202,162,74,.45);box-shadow:var(--shadow)}
.news-card .thumb{aspect-ratio:16/9;overflow:hidden}
.news-card .thumb img{width:100%;height:100%;object-fit:cover}
.news-body{padding:20px 22px;flex:1;display:flex;flex-direction:column}
.news-cat{font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--gold);margin-bottom:8px}
.news-card h3{font-size:1.12rem;margin-bottom:8px}
.news-card p{color:var(--muted);font-size:.92rem;flex:1}
.news-date{color:var(--dim);font-size:.8rem;margin-top:12px}

/* --- accordion (guide / faq) --- */
.accordion{max-width:820px;margin:0 auto;display:grid;gap:12px}
.acc{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.acc-q{width:100%;text-align:left;background:none;border:none;color:var(--txt);font-family:var(--ff);
  font-size:1.02rem;font-weight:600;padding:18px 22px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:14px}
.acc-q:hover{color:var(--gold-lt)}
.acc-q .chev{transition:.3s;color:var(--gold);font-size:1.3rem;flex:0 0 auto}
.acc.open .acc-q .chev{transform:rotate(45deg)}
.acc-a{max-height:0;overflow:hidden;transition:max-height .3s ease;color:var(--muted)}
.acc.open .acc-a{max-height:600px}
.acc-a .inner{padding:0 22px 20px;font-size:.95rem}
.acc-a .inner p{margin-bottom:8px}
.acc-a .inner ol,.acc-a .inner ul{margin:8px 0 8px 20px;list-style:revert}
.acc-a .inner li{margin-bottom:6px}

/* --- responsive --- */
@media(max-width:900px){
  .intro-grid{grid-template-columns:1fr;gap:28px}
  .feat-grid,.news-grid{grid-template-columns:repeat(2,1fr)}
  .gallery{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  .nav-links{position:fixed;inset:72px 0 auto 0;flex-direction:column;align-items:stretch;gap:0;
    background:rgba(12,10,8,.99);border-bottom:1px solid var(--line);padding:8px;
    transform:translateY(-130%);transition:.32s;box-shadow:var(--shadow)}
  .nav-links.open{transform:translateY(0)}
  .nav-links a{padding:14px 16px;border-radius:8px}
  .nav-cta .btn-ghost{display:none}
  .nav-toggle{display:grid;place-items:center}
  .dl-meta{grid-template-columns:1fr}
  .hero-meta{gap:18px}
}
@media(max-width:560px){
  .feat-grid,.news-grid,.gallery,.foot-grid{grid-template-columns:1fr}
  .section{padding:60px 0}
  .hero-cta{flex-direction:column;align-items:stretch}
  .btn{justify-content:center}
}
/* reveal animation */
.reveal{opacity:0;transform:translateY(24px);transition:.7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}