[hidden]{display:none !important}
:root{
  --bg:#0E1117; --bg2:#151A22; --card:#171D27; --line:#242B37; --line2:#394150;
  --ink:#F5F3EE; --ink2:#C9CDD4; --muted:#9097A3;
  --gold:#F2B544; --gold-ink:#151A22; --up:#4FB6A8; --dn:#E07A5F; --ok:#5BD49A;
  --display:'Space Grotesk', 'IBM Plex Sans Arabic', system-ui, sans-serif;
  --body:'IBM Plex Sans', 'IBM Plex Sans Arabic', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
  --mono:'IBM Plex Mono', ui-monospace, monospace;
  --r:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;overflow-x:clip;background:var(--bg);color:var(--ink2);font-family:var(--body);font-size:17px;line-height:1.6}
html[lang=ar] body{font-size:18px}
html[lang=ar] h1,html[lang=ar] h2,html[lang=ar] h3{font-family:'IBM Plex Sans Arabic',var(--display);letter-spacing:0}
html[lang^=zh] h1,html[lang^=zh] h2,html[lang^=zh] h3{letter-spacing:0}
a{color:var(--gold)} a:hover{color:#FFD27A}
img,svg{display:block}
h1,h2,h3{font-family:var(--display);color:var(--ink);margin:0;line-height:1.12}
p{margin:0}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;inset-inline-start:8px;top:8px;transform:translateY(-300%);background:var(--gold);color:var(--gold-ink);padding:8px 12px;border-radius:6px;z-index:99}
.skip:focus{transform:none}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 24px;border-radius:10px;border:1px solid var(--gold);background:var(--gold);color:var(--gold-ink);font:600 16px/1 var(--body);text-decoration:none;cursor:pointer;transition:background .15s,border-color .15s,color .15s}
.btn:hover{background:#FFC862;color:var(--gold-ink)}
.btn:disabled{opacity:.6;cursor:wait}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line2)}
.btn.ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn.sm{min-height:44px;padding:0 16px;font-size:15px}
.btn.xs{min-height:34px;padding:0 12px;font-size:13px;border-radius:8px}
.btn.full{width:100%}

/* nav */
.nav{position:sticky;top:0;z-index:20;background:rgba(14,17,23,.86);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:24px;height:68px}
.logo{display:flex;align-items:center;gap:10px;font:700 20px var(--display);color:var(--ink);text-decoration:none;letter-spacing:-.01em}
.logo:hover{color:var(--ink)}
.nav-links{display:flex;gap:28px;margin-inline-start:24px}
.nav-links a{color:var(--ink2);text-decoration:none;font-size:15px}
.nav-links a:hover{color:var(--ink)}
.nav-right{margin-inline-start:auto;display:flex;align-items:center;gap:12px}
.lang{min-height:44px;background:var(--bg2);color:var(--ink);border:1px solid var(--line2);border-radius:8px;padding:0 10px;font:500 14px var(--body);cursor:pointer}

/* hero */
.hero{padding:88px 0 72px;border-bottom:1px solid var(--line);background:radial-gradient(900px 400px at 85% 20%,rgba(242,181,68,.07),transparent 70%)}
.hero-in{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center}
.eyebrow{font:500 13px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--gold);margin-bottom:20px}
html[lang=ar] .eyebrow,html[lang^=zh] .eyebrow{letter-spacing:.04em;font-family:var(--body);font-weight:600}
h1{font-size:clamp(40px,5.6vw,68px);font-weight:700;letter-spacing:-.025em}
.lead{font-size:19px;color:var(--ink2);margin-top:24px;max-width:560px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:36px}
.points{list-style:none;padding:0;margin:36px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:10px 24px;font-size:15px;color:var(--ink2)}
.points li{display:flex;gap:10px;align-items:center}
.points li::before{content:"";width:8px;height:8px;border-radius:2px;background:var(--gold);flex:none}
.hero-art{background:var(--bg2);border:1px solid var(--line);border-radius:18px;padding:12px}
.chart{width:100%;height:auto}
.chart .lv{stroke:var(--line2);stroke-dasharray:4 6;stroke-width:1}
.chart .lvl{fill:var(--muted);font:500 11px var(--mono);letter-spacing:.08em;text-transform:uppercase}
.chart .up line{stroke:var(--up);stroke-width:1.4}.chart .up rect{fill:var(--up)}
.chart .dn line{stroke:var(--dn);stroke-width:1.4}.chart .dn rect{fill:var(--dn)}
.chart .dot{fill:var(--gold)}
.chart .an{fill:var(--gold);font:600 12px var(--body)}
html[dir=rtl] .chart{direction:ltr}

/* sections */
.sec{padding:96px 0;border-bottom:1px solid var(--line)}
h2{font-size:clamp(30px,3.6vw,46px);font-weight:700;letter-spacing:-.02em;max-width:820px}
.sub{margin-top:14px;color:var(--muted)}
.steps{list-style:none;padding:0;margin:48px 0 0;display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.steps li{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:28px}
.num{font:500 13px var(--mono);color:var(--gold);letter-spacing:.1em}
.steps h3{font-size:22px;margin:16px 0 10px}
.steps p{color:var(--muted);font-size:16px}

/* levels */
.levels{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px;align-items:stretch}
.level{position:relative;display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:32px 28px}
.level.featured{border-color:var(--gold);background:linear-gradient(var(--card),var(--card)) padding-box}
.badge{position:absolute;top:-13px;inset-inline-start:24px;background:var(--gold);color:var(--gold-ink);font:600 12px var(--body);padding:5px 12px;border-radius:99px}
.lv-num{font:500 13px var(--mono);color:var(--muted);letter-spacing:.12em}
.level h3{font-size:26px;margin-top:10px}
.lv-tag{color:var(--muted);font-size:15px;margin-top:6px}
.price{margin-top:26px;display:flex;align-items:baseline;gap:8px}
.price .amt{font:700 52px/1 var(--display);color:var(--ink);letter-spacing:-.02em}
.price .cur{font:500 14px var(--mono);color:var(--muted)}
.once{font-size:13px;color:var(--muted);margin-top:6px}
.ticks{list-style:none;padding:0;margin:26px 0 30px;display:flex;flex-direction:column;gap:12px;font-size:15px;flex:1}
.ticks li{display:flex;gap:12px}
.ticks li::before{content:"";flex:none;width:16px;height:16px;margin-top:4px;background:no-repeat center/16px url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23F2B544' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M4 12l5 5L20 6'/%3E%3C/svg%3E")}

/* inside */
.inside{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;margin-top:48px}
.ic{width:32px;height:32px;fill:none;stroke:var(--gold);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.inside h3{font-size:19px;margin:18px 0 8px}
.inside p{color:var(--muted);font-size:15px}

/* faq */
.faq-in{display:grid;grid-template-columns:360px 1fr;gap:64px}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;padding:22px 0;font:600 19px var(--display);color:var(--ink);display:flex;justify-content:space-between;gap:16px}
html[lang=ar] .faq summary{font-family:'IBM Plex Sans Arabic',var(--display)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font:400 24px/1 var(--mono);color:var(--gold);flex:none}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 0 22px;color:var(--ink2);max-width:720px}

/* footer */
.foot{padding:48px 0 56px}
.risk{font-size:13px;line-height:1.7;color:var(--muted);max-width:1000px}
.risk strong{color:var(--ink2)}
.foot-row{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;font-size:13px;color:#7A818D}
.foot-links{display:flex;gap:24px}
.foot-links a{color:var(--muted)}

/* checkout dialog */
.co{width:min(620px,calc(100vw - 24px));max-height:calc(100vh - 24px);padding:0;border:1px solid var(--line2);border-radius:18px;background:var(--bg2);color:var(--ink2)}
.co::backdrop{background:rgba(5,7,10,.72)}
.co-head{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:22px 24px;border-bottom:1px solid var(--line)}
.co-head h2{font-size:21px}
.x{width:44px;height:44px;display:grid;place-items:center;background:transparent;border:1px solid var(--line2);border-radius:10px;cursor:pointer;color:var(--ink)}
.x svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.co-body{padding:24px;display:flex;flex-direction:column;gap:12px}
.co label{font-weight:600;color:var(--ink);font-size:15px}
.co input[type=email],.co input[type=text]{width:100%;min-height:48px;padding:0 14px;border-radius:10px;border:1px solid var(--line2);background:var(--bg);color:var(--ink);font:16px var(--body)}
.co input:focus{border-color:var(--gold);outline:none}
.help{font-size:13px;color:var(--muted)}
.chk{display:flex;gap:10px;align-items:flex-start;font-weight:400 !important;font-size:14px !important;color:var(--ink2) !important;margin:6px 0}
.chk input{width:20px;height:20px;margin-top:2px;accent-color:var(--gold);flex:none}
.err{min-height:1.2em;font-size:14px;color:#FF9C85}
.pay-title{font:600 17px var(--display);color:var(--ink)}
.pay-grid{display:grid;grid-template-columns:168px 1fr;gap:20px;align-items:start}
.qr{background:#fff;border-radius:10px;padding:6px;width:168px;height:168px}
.qr svg{width:100%;height:100%}
.pay-fields{display:flex;flex-direction:column;gap:14px;min-width:0}
.fld .k{display:block;font:500 12px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.fld .v{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.fld .big{font:700 30px var(--display);color:var(--gold)}
.fld code{font:500 14px var(--mono);color:var(--ink);word-break:break-all;direction:ltr}
.warn{background:rgba(242,181,68,.09);border:1px solid rgba(242,181,68,.35);color:#F6D38D;border-radius:10px;padding:12px 14px;font-size:14px}
.wait{display:flex;gap:14px;align-items:center;background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.wait b{color:var(--ink)}
.wait[hidden],#coExpired[hidden]{display:none}
.timer{margin-inline-start:auto;font-size:13px;color:var(--muted);white-space:nowrap;text-align:end}
.timer b{display:block;font:600 18px var(--mono);color:var(--ink)}
.spin{width:22px;height:22px;border-radius:50%;border:2.5px solid var(--line2);border-top-color:var(--gold);animation:sp 1s linear infinite;flex:none}
@keyframes sp{to{transform:rotate(360deg)}}
.txbox summary{cursor:pointer;font-size:14px;color:var(--ink2);padding:6px 0}
.txrow{display:flex;gap:8px;margin-top:8px}
.txrow input{font-family:var(--mono) !important;font-size:13px !important;direction:ltr}
.done{align-items:center;text-align:center;padding:36px 24px}
.done .ok{width:56px;height:56px;fill:none;stroke:var(--ok);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.done h3{font-size:24px}

/* download page */
.dl-main{padding:64px 24px 96px;max-width:860px}
.dl-main h1{font-size:clamp(30px,4vw,44px);margin-bottom:12px}
.muted{color:var(--muted)} .small{font-size:14px;margin-top:32px}
.dl-langs{display:flex;gap:8px;flex-wrap:wrap;margin:28px 0 8px}
.dl-langs a{padding:8px 14px;border:1px solid var(--line2);border-radius:99px;color:var(--ink2);text-decoration:none;font-size:14px}
.dl-langs a.on{border-color:var(--gold);color:var(--gold)}
.files{list-style:none;padding:0;margin:24px 0 0;display:flex;flex-direction:column;gap:10px}
.files li{display:flex;align-items:center;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.ftype{font:600 12px var(--mono);color:var(--gold);border:1px solid rgba(242,181,68,.4);border-radius:6px;padding:4px 7px;flex:none}
.fname{flex:1;color:var(--ink);min-width:0;word-break:break-word}
.fname small{display:block;color:var(--muted);font-size:13px}
.factions{display:flex;gap:8px;flex:none}
.card-note{margin-top:24px;padding:16px;border:1px dashed var(--line2);border-radius:12px}

/* responsive */
@media (max-width:1000px){
  .hero-in{grid-template-columns:1fr}
  .levels{grid-template-columns:1fr;max-width:560px}
  .inside{grid-template-columns:1fr 1fr}
  .faq-in{grid-template-columns:1fr;gap:24px}
}
@media (max-width:760px){
  .wrap{padding:0 16px}
  .nav-links,.nav-cta{display:none}
  .hero{padding:56px 0}
  .sec{padding:64px 0}
  .steps{grid-template-columns:1fr}
  .points{grid-template-columns:1fr}
  .inside{grid-template-columns:1fr}
  .pay-grid{grid-template-columns:1fr}
  .qr{margin:0 auto}
  .wait{flex-wrap:wrap}
  .files li{flex-wrap:wrap}
  .factions{width:100%}.factions .btn{flex:1}
  .dl-main{padding:40px 16px 72px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.spin{animation-duration:3s}}

/* course language select, footer languages */
.co-select{width:100%;min-height:48px;padding:0 12px;border-radius:10px;border:1px solid var(--line2);background:var(--bg);color:var(--ink);font:16px var(--body);cursor:pointer}
.co-select:focus{border-color:var(--gold);outline:none}
.foot-langs{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:18px;font-size:13px}
.foot-langs a{color:var(--muted);text-decoration:none}
.foot-langs a:hover{color:var(--gold)}

/* guides / articles */
.article{max-width:780px;padding:56px 24px 88px}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:20px}
.crumbs a{color:var(--muted)}
.article h1{font-size:clamp(32px,4.4vw,48px);margin-bottom:16px}
.article .intro{font-size:19px;color:var(--ink2);margin-bottom:8px}
.article .meta{font-size:13px;color:var(--muted);margin:14px 0 8px}
.article h2{font-size:clamp(24px,3vw,30px);margin:48px 0 14px}
.article h3{font-size:20px;margin:28px 0 10px}
.article p,.article li{font-size:17px;color:var(--ink2);margin:0 0 14px}
.article ul,.article ol{padding-inline-start:22px;margin:0 0 16px}
.article strong{color:var(--ink)}
.article table{width:100%;border-collapse:collapse;margin:8px 0 22px;font-size:15px}
.article th,.article td{border-bottom:1px solid var(--line);padding:10px 8px;text-align:start;vertical-align:top}
.article th{color:var(--ink);font-weight:600}
.fig{background:var(--bg2);border:1px solid var(--line);border-radius:14px;padding:16px;margin:8px 0 24px}
.fig svg{width:100%;height:auto}
.fig figcaption{font-size:13px;color:var(--muted);margin-top:8px}
.fig .up line{stroke:var(--up);stroke-width:2}.fig .up rect{fill:var(--up)}
.fig .dn line{stroke:var(--dn);stroke-width:2}.fig .dn rect{fill:var(--dn)}
.fig text{fill:var(--muted);font:500 12px var(--body)}
.fig .lab{fill:var(--gold);font-weight:600}
.fig .gl{stroke:var(--line2);stroke-dasharray:4 5}
.callout{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px 24px;margin:36px 0}
.callout h2{margin-top:0;font-size:24px}
.callout .btn{margin-top:10px}
.guide-list{list-style:none;padding:0;margin:32px 0 0;display:flex;flex-direction:column;gap:14px}
.guide-list a{display:block;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px 24px;text-decoration:none}
.guide-list a:hover{border-color:var(--gold)}
.guide-list b{display:block;font:700 21px var(--display);color:var(--ink);margin-bottom:6px}
.guide-list span{color:var(--muted);font-size:15px}
.disclaimer{font-size:13px;color:var(--muted);border-top:1px solid var(--line);padding-top:18px;margin-top:40px}