/* Hướng Dẫn Olymp Trade Việt Nam — navy + gold, dark navy hero, cool light body */
:root{
  --bg:#f4f6fb; --surface:#ffffff; --surface-2:#eef1f8;
  --ink:#0f1b34; --muted:#5a6480; --line:#e1e6f0;
  --brand:#1d4ed8; --brand-d:#1e3a8a; --brand-soft:#e7edfc;
  --gold:#d99400; --gold-b:#eab308; --gold-soft:#fbf3d6;
  --navy:#152449; --navy-2:#1e3a8a;
  --danger:#c0392b; --danger-soft:#fbe9e6; --ok:#0e7c5a; --ok-soft:#e3f3ee;
  --shadow:0 1px 2px rgba(15,27,52,.06),0 10px 28px rgba(15,27,52,.08);
  --radius:12px; --maxw:1140px;
  --sans:"Be Vietnam Pro","Segoe UI",-apple-system,BlinkMacSystemFont,Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-size:17px;line-height:1.72;-webkit-font-smoothing:antialiased}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
a{color:var(--brand-d);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}

/* header */
.hd{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.94);
  backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.hd-in{display:flex;align-items:center;gap:20px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17px;color:var(--ink)}
.logo:hover{text-decoration:none}
.logo .mk{width:31px;height:31px;border-radius:8px;background:var(--brand-d);
  display:grid;place-items:center;color:var(--gold-b);font-weight:900;font-size:14px}
.logo small{display:block;font-size:11px;font-weight:600;color:var(--muted)}
.nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.nav a{padding:8px 11px;font-size:14.5px;font-weight:600;color:var(--ink);
  border-top:2px solid transparent;border-radius:0 0 6px 6px}
.nav a:hover{color:var(--brand-d);text-decoration:none;border-top-color:var(--gold-b)}
.nav a.active{color:var(--brand-d);border-top-color:var(--brand)}
.hd .btn{margin-left:6px}
.menu-tg{display:none}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--brand);color:#fff;
  padding:10px 17px;border-radius:8px;font-weight:700;font-size:14.5px;border:0;cursor:pointer}
.btn:hover{background:var(--brand-d);text-decoration:none;color:#fff}
.btn-lg{padding:14px 24px;font-size:16px}
.btn-gold{background:var(--gold);color:#22160a}
.btn-gold:hover{background:var(--gold-b);color:#22160a}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.4)}
.btn-ghost:hover{background:rgba(255,255,255,.12);color:#fff}
.btn-ghost-l{background:var(--surface);color:var(--brand-d);border:1.5px solid var(--line)}
.btn-ghost-l:hover{background:var(--surface-2);color:var(--brand-d)}

/* hero — DARK navy panel (signature differentiator) */
.hero{background:linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 100%);color:#eaf0ff;
  padding:56px 0 40px;position:relative;overflow:hidden}
.hero:before{content:"";position:absolute;inset:0;z-index:0;opacity:.5;
  background:radial-gradient(50% 60% at 90% 0%,rgba(234,179,8,.18) 0%,transparent 60%),
            repeating-linear-gradient(125deg,transparent 0 30px,rgba(255,255,255,.02) 30px 31px)}
.hero .wrap{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:40px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:7px;background:rgba(234,179,8,.16);
  color:var(--gold-b);font-weight:700;font-size:12.5px;padding:6px 13px;border-radius:6px;
  border:1px solid rgba(234,179,8,.3)}
.hero h1{font-size:clamp(29px,4.3vw,45px);line-height:1.2;font-weight:800;color:#fff;
  margin:16px 0 14px;letter-spacing:-.015em}
.hero h1 em{font-style:normal;color:var(--gold-b);border-bottom:4px solid var(--gold);padding-bottom:2px}
.hero-lead{font-size:18px;color:#c3cde8;margin:0 0 24px;max-width:46ch}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:22px}
.trust-row{display:flex;gap:20px;flex-wrap:wrap;font-size:13.5px;color:#aab6d6}
.trust-row b{color:#fff}
.hero-form{background:var(--surface);border:1px solid var(--line);border-radius:16px;
  box-shadow:0 20px 50px rgba(0,0,0,.3);padding:20px;text-align:center;border-top:4px solid var(--gold-b)}
.hero-form h2{font-size:18px;margin:2px 0 4px;color:var(--ink)}
.hero-form h2:before{display:none}
.hero-form .sub{font-size:13px;color:var(--muted);margin:0 0 14px}
.hero-form iframe{max-width:100%;border-radius:10px}
.hero-form .mini{font-size:11.5px;color:var(--muted);margin-top:12px}

/* sections + headings (gold ▸ marker signature) */
section{margin:38px 0}
h2{font-size:26px;line-height:1.3;font-weight:800;margin:34px 0 14px;letter-spacing:-.01em;color:var(--ink)}
h2:before{content:"▸";color:var(--gold);font-size:24px;margin-right:10px;vertical-align:-1px}
h3{font-size:19px;font-weight:700;margin:24px 0 8px}
.lead{font-size:19px;color:var(--muted)}
.muted{color:var(--muted)}

/* feature strip */
.feat-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:-30px 0 26px;position:relative;z-index:5}
.feat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 18px;box-shadow:var(--shadow);border-bottom:3px solid var(--gold-b)}
.feat .n{font-size:24px;color:var(--brand-d);font-weight:800}
.feat .l{font-size:13.5px;color:var(--muted);margin-top:2px}

/* content cards (top navy border → gold hover) */
.ncards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:20px 0}
.ncard{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);
  border-top:3px solid var(--brand-d);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);transition:.15s}
.ncard:hover{text-decoration:none;transform:translateY(-2px);border-top-color:var(--gold-b);
  box-shadow:0 8px 26px rgba(29,78,216,.14)}
.ncard-t{font-weight:800;font-size:16.5px;color:var(--ink)}
.ncard-d{font-size:14px;color:var(--muted);margin:6px 0 12px;flex:1}
.ncard-go{font-size:13.5px;font-weight:700;color:var(--brand-d)}

/* article */
.article{background:var(--surface);border:1px solid var(--line);border-radius:16px;
  box-shadow:var(--shadow);padding:34px 40px;margin-top:22px}
.article p{margin:14px 0}
.article ul,.article ol{margin:14px 0;padding-left:22px}
.article li{margin:8px 0}
.article strong{color:var(--ink)}

/* callouts */
.callout{display:flex;gap:12px;align-items:flex-start;border-radius:12px;padding:14px 16px;margin:18px 0;
  font-size:15.5px;border:1px solid var(--line);background:var(--surface-2)}
.callout-ic{font-size:18px;line-height:1.5}
.callout.warn{background:var(--gold-soft);border-color:#eeddab}
.callout.ok{background:var(--ok-soft);border-color:#c2e4d8}
.callout.danger{background:var(--danger-soft);border-color:#f0c7c1}

/* tables */
.tbl-wrap{overflow-x:auto;margin:18px 0}
table{width:100%;border-collapse:collapse;font-size:15px;min-width:460px}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line)}
th{background:var(--brand-soft);font-size:13.5px;color:var(--brand-d);font-weight:700}
tbody tr:hover{background:var(--gold-soft)}

/* steps */
.steps{list-style:none;padding:0}
.steps li{display:flex;gap:16px;padding:14px 0;border-bottom:1px dashed var(--line)}
.steps li:last-child{border-bottom:0}
.step-n{flex:none;width:34px;height:34px;border-radius:8px;background:var(--brand-d);color:var(--gold-b);
  display:grid;place-items:center;font-weight:800}
.steps strong{display:block}
.steps p{margin:3px 0 0;color:var(--muted);font-size:15px}

/* cta strip */
.cta-strip{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;
  background:linear-gradient(100deg,var(--navy),var(--brand-d));color:#fff;border-radius:14px;
  padding:22px 26px;margin:30px 0}
.cta-strip strong{display:block;font-size:19px}
.cta-strip span{font-size:14.5px;opacity:.9}
.cta-strip .btn{background:var(--gold);color:#22160a}
.cta-strip .btn:hover{background:var(--gold-b);color:#22160a}

/* faq */
.faq-item{background:var(--surface);border:1px solid var(--line);border-radius:12px;margin:10px 0;
  padding:0 18px;box-shadow:var(--shadow)}
.faq-item summary{cursor:pointer;font-weight:700;padding:16px 0;list-style:none;font-size:16px;
  display:flex;justify-content:space-between;gap:12px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:after{content:"+";color:var(--gold);font-weight:800;font-size:20px}
.faq-item[open] summary:after{content:"–"}
.faq-a{padding:0 0 16px;color:var(--muted);font-size:15.5px}

/* form section */
.form-sec{margin:34px 0}
.form-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);
  padding:28px;text-align:center;max-width:560px;margin:0 auto;border-top:4px solid var(--gold-b)}
.form-card h2{font-size:22px;margin:0 0 6px}
.form-card h2:before{display:none}
.form-sub{color:var(--muted);font-size:15px;margin:0 auto 18px;max-width:46ch}
.iframe-hold{display:flex;justify-content:center}
.iframe-hold iframe{max-width:100%;border-radius:10px}
.form-risk{font-size:12.5px;color:var(--muted);margin-top:14px}

/* breadcrumb + toc */
.bc{font-size:13px;color:var(--muted);padding:16px 0 0}
.bc a{color:var(--muted)}
.bc b{color:var(--ink)}
.toc{background:var(--brand-soft);border:1px solid #cdd9f6;border-radius:12px;padding:16px 20px;margin:20px 0}
.toc strong{font-size:13px;letter-spacing:.02em;color:var(--brand-d)}
.toc ul{margin:8px 0 0;padding-left:18px;columns:2}
.toc a{font-size:14.5px;color:var(--brand-d)}
.related h2{font-size:22px}

/* footer */
.ft{background:var(--navy);color:#aeb9d6;margin-top:50px;padding:44px 0 26px;font-size:14px}
.ft a{color:#aeb9d6}
.ft h4{color:#fff;font-size:14px;margin:0 0 12px}
.ft-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:30px}
.ft ul{list-style:none;padding:0;margin:0}
.ft li{margin:7px 0}
.ft-brand .logo{color:#fff}
.ft-brand .logo small{color:#8a97ba}
.ft-risk{border-top:1px solid #263258;margin-top:30px;padding-top:20px;
  font-size:12.5px;color:#8592b5;line-height:1.7}
.ft-copy{margin-top:16px;font-size:12.5px;color:#74809f}

@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr}
  .feat-strip{grid-template-columns:repeat(2,1fr);margin-top:20px}
  .ncards{grid-template-columns:1fr 1fr}
  .ft-grid{grid-template-columns:1fr 1fr}
  .article{padding:26px 22px}
  .toc ul{columns:1}
}
@media(max-width:640px){
  body{font-size:16px}
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--surface);
    flex-direction:column;padding:10px;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  .nav.open{display:flex}
  .nav a{padding:12px;border-top:0;border-left:2px solid transparent}
  .menu-tg{display:inline-grid;place-items:center;margin-left:auto;width:42px;height:42px;
    border:1px solid var(--line);border-radius:10px;background:var(--surface);font-size:20px}
  .hd .btn{display:none}
  .ncards,.feat-strip{grid-template-columns:1fr}
  .cta-strip{flex-direction:column;align-items:flex-start}
}

/* partner banners + sticky dock (Oct 2026) */
.ad-slot{display:flex;flex-direction:column;align-items:center;gap:4px;margin:26px auto;text-align:center}
.ad-slot a{display:block;line-height:0;border-radius:10px;box-shadow:0 6px 22px rgba(30,58,138,.22);transition:.15s}
.ad-slot a:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(30,58,138,.3)}
.ad-slot img{max-width:100%;height:auto;border-radius:10px}
.ad-lbl{font-size:11px;color:var(--muted);letter-spacing:.03em}
.go-dock{position:fixed;left:50%;bottom:14px;transform:translateX(-50%);z-index:60;display:flex;align-items:center;gap:14px;
  width:min(640px,calc(100% - 24px));background:var(--navy);color:#fff;border-radius:14px;padding:10px 12px 10px 18px;
  box-shadow:0 14px 40px rgba(15,27,52,.38);border-top:3px solid var(--gold-b)}
.go-dock[hidden]{display:none}
.go-dock-t{flex:1;line-height:1.35}
.go-dock-t b{display:block;font-size:15px}
.go-dock-t small{font-size:12px;opacity:.75}
.go-dock .btn{white-space:nowrap}
.go-dock-x{background:none;border:0;color:#fff;opacity:.6;font-size:22px;cursor:pointer;padding:0 4px}
.go-dock-x:hover{opacity:1}
@media(max-width:640px){.go-dock{gap:8px;padding:8px 8px 8px 14px}.go-dock-t b{font-size:13.5px}.go-dock-t small{display:none}}

/* print — giữ thương hiệu navy + gold khi in */
@media print{
  header.hd,.go-dock,.ad-slot,.form-sec,.hero-form,.hero-cta,.btn,.menu-tg,
  .faq summary{cursor:default}
  header.hd,.go-dock,.ad-slot,.form-sec,.hero-form,.btn{display:none!important}
  body{background:#fff;color:#111;font-size:12pt;line-height:1.55}
  .wrap{max-width:100%;padding:0}
  .hero{background:#fff!important;color:#111;border-bottom:3px solid var(--gold-b)}
  .hero h1,.hero .hero-lead{color:#111}
  a{color:#111;text-decoration:none}
  .article a[href^="/"]::after,.faq a[href^="/"]::after{content:" (https://olymptrade-vietnam.lat" attr(href) ")";font-size:9pt;color:#555}
  .toc,.callout,.ncard,.tbl-wrap{border:1px solid #bbb;break-inside:avoid}
  .tbl-wrap table{font-size:10pt}
  .ft-grid{display:none}
  footer.ft{border-top:2px solid var(--gold-b)}
  .ft-risk,.ft-copy{color:#333;font-size:9.5pt}
}