/* GPT Trader — inner pages. Same world as the 3D home page, without the flight:
   a still night skyline fixed at the bottom, HUD-style top bar, glass panels with corner brackets. Dark only. */
:root{
  color-scheme:dark;
  --ink:#04050b; --glass:rgba(7,9,18,.74); --glass-2:rgba(12,15,28,.82);
  --fg:#f2f3f8; --text:#d8dbe8; --muted:#a9adc2; --dim:#6f748c;
  --acc:#ff3d9a; --acc-2:#35e0ff; --on-acc:#07080f; --ok:#4dffb0; --err:#ff6b6b;
  --line:rgba(255,255,255,.11);
  --display:"Unbounded","Arial Black",system-ui,sans-serif;
  --body:"Manrope",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.2,.7,.1,1);
}
:root:lang(el){--display:"Manrope","Arial",sans-serif}
:root:lang(zh){--display:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;--body:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{margin:0;background:var(--ink);color:var(--fg);font-family:var(--body);font-size:16.5px;line-height:1.65;overflow-x:clip;-webkit-font-smoothing:antialiased;min-height:100vh}
a{color:inherit}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a:focus-visible,button:focus-visible,summary:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--acc);outline-offset:3px}
img{max-width:100%}

/* night city backdrop */
.city{position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    url("skyline.svg") center bottom/auto 46vh repeat-x,
    radial-gradient(70% 45% at 50% 100%,rgba(255,61,154,.22),transparent 70%),
    radial-gradient(40% 30% at 85% 92%,rgba(53,224,255,.12),transparent 70%),
    linear-gradient(180deg,#04050b 0%,#070a16 55%,#120a1c 100%)}
.city::before{content:"";position:absolute;inset:0;opacity:.55;
  background-image:radial-gradient(1px 1px at 12% 18%,#fff,transparent),radial-gradient(1px 1px at 27% 8%,#fff,transparent),radial-gradient(1px 1px at 44% 22%,#fff,transparent),radial-gradient(1px 1px at 63% 12%,#fff,transparent),radial-gradient(1px 1px at 78% 26%,#fff,transparent),radial-gradient(1px 1px at 91% 9%,#fff,transparent),radial-gradient(1px 1px at 6% 34%,#fff,transparent),radial-gradient(1px 1px at 55% 36%,#fff,transparent)}
.city::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,rgba(4,5,11,.55))}

/* top bar */
.sbar{position:fixed;left:0;right:0;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:18px;padding:calc(12px + env(safe-area-inset-top,0px)) clamp(16px,2.6vw,36px) 14px;background:linear-gradient(rgba(3,4,10,.92),rgba(3,4,10,.0));transition:background .3s,border-color .3s;border-bottom:1px solid transparent}
.sbar.on{background:rgba(3,4,10,.86);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-color:var(--line)}
.logo{display:flex;align-items:center;flex:none}
.logo img{height:30px;width:auto;display:block}
.snav{display:flex;gap:22px;font-size:14px;color:var(--muted);flex-wrap:wrap}
.snav a{text-decoration:none;position:relative;padding-block:4px;transition:color .3s}
.snav a::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:1px;background:var(--acc);transform:scaleX(0);transition:transform .4s var(--ease)}
.snav a:hover,.snav a[aria-current="page"]{color:var(--fg)}
.snav a:hover::after,.snav a[aria-current="page"]::after{transform:none}
.acts{display:flex;gap:8px;align-items:center}
.hbtn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);padding:9px 13px;border-radius:3px;background:rgba(6,8,17,.5);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);transition:border-color .3s,color .3s;white-space:nowrap;letter-spacing:.12em;text-transform:uppercase;font-family:var(--mono);font-size:12px;text-decoration:none}
.hbtn:hover,.hbtn[aria-expanded="true"]{border-color:var(--acc);color:var(--acc)}
.hbtn.go{background:var(--acc);color:var(--on-acc);border-color:var(--acc);font-weight:500}
.hbtn.go:hover{color:var(--on-acc);box-shadow:0 0 30px -6px var(--acc)}
.burger{width:14px;height:9px;position:relative;border-block:1.5px solid currentColor}
.burger::after{content:"";position:absolute;left:0;right:0;top:50%;height:1.5px;margin-top:-.75px;background:currentColor}
.lang{position:relative}
.lang ul{position:absolute;right:0;top:calc(100% + 8px);margin:0;list-style:none;padding:6px;min-width:190px;background:rgba(6,8,17,.95);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);display:flex;flex-direction:column;font-size:14px;z-index:5}
.lang a{display:flex;justify-content:space-between;gap:12px;padding:8px 12px;color:var(--muted);text-decoration:none}
.lang a::after{content:attr(data-code);font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--dim)}
.lang a:hover{background:rgba(255,255,255,.06);color:var(--fg)}
.lang a.on{color:var(--acc)}
.menu-btn{display:none}
.menu{position:fixed;inset:0;z-index:40;background:rgba(3,4,10,.9);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);display:flex;flex-direction:column;padding:calc(84px + env(safe-area-inset-top,0px)) clamp(16px,6vw,96px) calc(40px + env(safe-area-inset-bottom,0px));overflow-y:auto}
.menu .lab{font-family:var(--mono);font-size:12px;letter-spacing:.3em;text-transform:uppercase;color:var(--acc);margin-bottom:18px}
.menu nav{display:flex;flex-direction:column}
.menu nav a{padding-block:10px;font-family:var(--display);font-size:clamp(24px,4.4vw,52px);line-height:1.1;font-weight:500;border-bottom:1px solid var(--line);text-decoration:none;transition:color .3s,padding .4s var(--ease)}
.menu nav a:hover{color:var(--acc);padding-left:12px}
.menu .close{position:fixed;right:clamp(16px,2.6vw,36px);top:calc(12px + env(safe-area-inset-top,0px))}
@media(max-width:1180px){.snav{display:none}.menu-btn{display:inline-flex}}
@media(max-width:640px){.calc{display:none}.logo img{height:24px}.hbtn{padding:8px 10px}}

/* layout + shared type */
main{position:relative;z-index:1}
.container{max-width:1120px;margin-inline:auto;padding-inline:clamp(16px,5vw,64px)}
h1,h2,h3{font-family:var(--display);font-weight:500;letter-spacing:-.01em;text-wrap:balance;margin:0}
:root:lang(el) h1,:root:lang(el) h2{font-weight:800}
.section{padding-block:clamp(110px,14vw,150px) clamp(80px,10vw,120px)}
.section-header{display:flex;flex-direction:column;gap:16px;margin-bottom:clamp(28px,4vw,48px);max-width:820px}
.section-header::before{content:"GPT TRADER";font-family:var(--mono);font-size:12px;letter-spacing:.3em;color:var(--acc)}
.section-header h1{font-size:clamp(28px,4.6vw,60px);line-height:1.06;font-weight:700;text-transform:uppercase}
.section-lead{color:var(--muted);font-size:clamp(16px,1.3vw,18.5px);max-width:62ch;margin:0}
.card{position:relative;background:var(--glass);backdrop-filter:blur(16px) saturate(1.3);-webkit-backdrop-filter:blur(16px) saturate(1.3);border:1px solid var(--line);padding:clamp(20px,2.6vw,34px)}
.card::before,.card::after{content:"";position:absolute;width:14px;height:14px;border:2px solid var(--acc);pointer-events:none}
.card::before{left:-1px;top:-1px;border-right:0;border-bottom:0}
.card::after{right:-1px;bottom:-1px;border-left:0;border-top:0}
.card h3{font-size:clamp(18px,1.6vw,22px);line-height:1.25;margin-bottom:10px}
.card p{color:var(--text);margin:0 0 .8em}
.card p:last-child{margin-bottom:0}
.card a{color:var(--acc)}

/* article list */
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
@media(max-width:820px){.grid-2{grid-template-columns:1fr}}
.article-link{display:flex;flex-direction:column;text-decoration:none;color:var(--fg)!important;transition:transform .4s var(--ease),border-color .3s,background .3s}
.article-link p{color:var(--muted);font-size:15px}
.article-link:hover{transform:translateY(-4px);border-color:rgba(255,61,154,.45);background:var(--glass-2)}
.article-link-more{margin-top:auto;padding-top:14px;font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--acc)}

/* article page */
.article-page-main{padding-block:clamp(100px,12vw,130px) clamp(90px,10vw,130px)}
.article-wrap{max-width:860px}
.breadcrumbs{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--dim);margin-bottom:18px;display:flex;flex-wrap:wrap;gap:6px}
.breadcrumbs a{color:var(--muted);text-decoration:none}
.breadcrumbs a:hover{color:var(--acc)}
.breadcrumbs span{color:var(--acc)}
.article-content{padding:clamp(24px,4.4vw,56px)}
.article-content h1{font-size:clamp(26px,3.6vw,46px);line-height:1.1;font-weight:700;margin-bottom:28px}
.article-content h2{font-size:clamp(19px,2vw,25px);line-height:1.25;margin:2em 0 .7em;display:flex;gap:12px;align-items:baseline}
.article-content h2::before{content:"";flex:none;width:8px;height:8px;background:var(--acc);transform:rotate(45deg) translateY(-3px)}
.article-content p{font-size:17px;line-height:1.78;max-width:68ch}
.article-content ul,.article-content ol{margin:0 0 1.1em;padding:0;list-style:none;display:flex;flex-direction:column;gap:8px;max-width:68ch}
.article-content li{display:flex;gap:12px;color:var(--text);font-size:16.5px}
.article-content ul li::before{content:"";flex:none;width:12px;height:1px;background:var(--acc);margin-top:.85em}
.article-content ol{counter-reset:o}
.article-content ol li{counter-increment:o}
.article-content ol li::before{content:counter(o);font-family:var(--mono);color:var(--acc);font-size:13px;margin-top:.2em}
.article-content strong{color:var(--fg)}
.article-back{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}

/* terms */
.terms-toc p{display:flex;flex-wrap:wrap;gap:6px;font-size:0}
.terms-toc a{display:inline-grid;place-items:center;min-width:38px;height:38px;border:1px solid var(--line);font-family:var(--mono);font-size:13px;text-decoration:none;color:var(--fg)!important;transition:border-color .3s,color .3s}
.terms-toc a:hover{border-color:var(--acc);color:var(--acc)!important}
[id^="section-"]{scroll-margin-top:90px}

/* footer */
.site-foot{position:relative;z-index:1;background:linear-gradient(transparent,rgba(3,4,10,.94) 30%);padding-block:70px 60px;font-size:14px;color:var(--muted)}
.site-foot .container{display:flex;flex-direction:column;gap:16px}
.frow{display:flex;flex-wrap:wrap;gap:10px 24px}
.frow a{text-decoration:none}
.frow a:hover{color:var(--acc)}
.risk{font-size:13px;color:var(--dim);max-width:90ch;margin:0}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}html{scroll-behavior:auto}}