/* DarkGPT — public download page */
:root{--bg:#050102;--panel:#0b0204;--line:#22090f;--line2:#3a0d17;--red:#e3122f;--red2:#ff2340;--soft:#ff5c74;
  --txt:#f3eaec;--txt2:#cdbcc0;--mut:#9a878c;--field:#120507;
  --font:"Segoe UI","Inter",system-ui,-apple-system,Roboto,sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--txt);-webkit-font-smoothing:antialiased;line-height:1.5;
  background:radial-gradient(700px 520px at 0% 0%,rgba(150,10,30,.30),transparent 70%),
             radial-gradient(800px 600px at 100% 30%,rgba(120,8,25,.16),transparent 70%),var(--bg);background-attachment:fixed}
a{color:inherit}
img{max-width:100%;display:block}
.muted{color:var(--mut)}

/* nav */
.nav{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px clamp(16px,4vw,48px);background:rgba(5,1,2,.78);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.tile{width:34px;height:34px;border-radius:9px;display:grid;place-items:center;background:radial-gradient(circle at 50% 40%,#22090f,#140508);
  border:1px solid #5a1422;box-shadow:0 0 14px rgba(255,20,50,.35)}
.tile img{width:26px;height:26px}
.wordmark{font-size:16px;font-weight:800;letter-spacing:4px}.wordmark b{color:var(--red2)}
.beta{font-size:10px;font-weight:800;letter-spacing:1.5px;color:#ff8ea0;border:1px solid #5a1020;background:rgba(224,18,54,.12);padding:3px 8px;border-radius:999px}
.nav nav{display:flex;align-items:center;gap:6px}
.nav nav a{text-decoration:none;font-size:14px;color:var(--txt2);padding:8px 12px;border-radius:7px}
.nav nav a:hover{color:#fff;background:#170609}
.nav .nav-cta{border:1px solid #8a1a2e;color:#fff!important;background:linear-gradient(90deg,rgba(150,15,35,.25),rgba(80,8,20,.1))}

main{max-width:1160px;margin:0 auto;padding:0 clamp(16px,4vw,40px)}

/* hero */
.hero{display:grid;grid-template-columns:1.1fr 420px;gap:56px;align-items:center;padding:72px 0 56px}
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:12px;font-weight:700;letter-spacing:1.8px;text-transform:uppercase;
  color:#ff8ea0;border:1px solid #5a1020;background:rgba(224,18,54,.10);padding:6px 12px;border-radius:999px}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--red2);box-shadow:0 0 10px var(--red2);animation:pulse 1.8s infinite}
@keyframes pulse{50%{opacity:.35}}
h1{font-size:clamp(40px,6vw,66px);line-height:1.04;letter-spacing:-1px;margin:22px 0 20px;font-weight:900}
h1 .red{color:var(--red2);text-shadow:0 0 34px rgba(255,35,64,.35)}
.lead{font-size:18px;color:var(--txt2);max-width:540px;margin:0 0 26px}
.ticks{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:10px 22px}
.ticks li{display:flex;align-items:center;gap:8px;font-size:14.5px;color:#e6d8db}
.ticks li::before{content:"";width:16px;height:16px;border-radius:50%;flex:none;
  background:var(--red2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5'%3E%3Cpath d='m5 12 5 5 9-10'/%3E%3C/svg%3E") center/10px no-repeat}

/* key card */
.key-card{background:linear-gradient(180deg,#120407,#0b0204);border:1px solid #5a1020;border-radius:14px;padding:30px 28px 24px;
  box-shadow:0 0 60px rgba(220,15,45,.16),inset 0 0 0 1px rgba(255,40,70,.03);text-align:center}
.key-logo{width:200px;margin:0 auto 6px;filter:drop-shadow(0 0 22px rgba(255,20,50,.35))}
.key-card h2{font-size:22px;margin:8px 0 4px}
.key-card > p{font-size:14px;margin:0 0 22px}
.f-label{display:block;text-align:left;font-size:12px;font-weight:600;color:#a08e93;margin:0 0 8px}
.f-input{width:100%;height:48px;background:var(--field);border:1px solid #2a0c13;border-radius:8px;color:var(--txt);font-size:15px;
  padding:0 14px;outline:none;margin-bottom:14px;font-family:inherit;transition:border-color .15s,box-shadow .15s}
.f-input:focus{border-color:var(--red2);box-shadow:0 0 0 1px rgba(255,35,64,.5),0 0 20px rgba(255,35,64,.3)}
.key-input{font-family:ui-monospace,Consolas,monospace;font-size:17px;letter-spacing:2px;text-align:center;text-transform:uppercase}
.key-input::placeholder{letter-spacing:2px;color:#5a4a4f}
.btn-red{width:100%;height:50px;border:none;border-radius:8px;cursor:pointer;color:#fff;font-size:13.5px;font-weight:800;letter-spacing:1.5px;
  text-transform:uppercase;display:flex;align-items:center;justify-content:center;gap:10px;font-family:inherit;
  background:linear-gradient(90deg,#ff2240,#c10c28);box-shadow:0 8px 30px rgba(255,25,55,.35)}
.btn-red:hover{filter:brightness(1.08)}.btn-red:disabled{opacity:.6;cursor:default}
.msg{min-height:22px;font-size:13.5px;margin:12px 0 0}
.msg.bad{color:#ff6b81}.msg.good{color:#4ad07d}
.rel{font-size:12.5px;color:var(--mut);margin-top:6px}
.nokey{font-size:13px;color:var(--mut);margin-top:16px;padding-top:16px;border-top:1px solid var(--line)}
.nokey a{color:var(--soft);font-weight:600;text-decoration:none}.nokey a:hover{text-decoration:underline}

/* preview */
.preview{margin:10px 0 30px;border-radius:14px;overflow:hidden;border:1px solid #3a0d17;box-shadow:0 30px 90px rgba(0,0,0,.6),0 0 60px rgba(220,15,45,.10)}

/* blocks */
.block{padding:64px 0 10px}
.h2{font-size:clamp(26px,3.4vw,36px);text-align:center;margin:0 0 34px;letter-spacing:-.3px}
.h2.left{text-align:left;margin-bottom:22px}
.feats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.feat{background:var(--panel);border:1px solid var(--line2);border-radius:12px;padding:22px}
.feat .ic{width:42px;height:42px;border-radius:10px;display:grid;place-items:center;color:var(--red2);margin-bottom:14px;
  background:radial-gradient(circle at 50% 40%,#22090f,#140508);border:1px solid #5a1422}
.feat .ic svg{width:21px;height:21px}
.feat h3{font-size:16px;margin:0 0 6px}
.feat p{font-size:14px;color:var(--mut);margin:0}

.models{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.model{background:var(--panel);border:1px solid var(--line2);border-radius:12px;padding:20px}
.model.rec{border-color:#8a1a2e;background:linear-gradient(180deg,rgba(150,15,35,.18),#0b0204 60%);box-shadow:0 0 30px rgba(255,30,60,.08)}
.mh{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.mh b{font-size:16px}
.pp{font-size:11px;font-weight:700;color:#ff8ea0;border:1px solid #5a1020;background:rgba(224,18,54,.12);padding:1px 8px;border-radius:999px}
.tag{font-size:10px;font-weight:800;letter-spacing:.8px;text-transform:uppercase;color:#4ad07d;border:1px solid #1f5a33;padding:2px 7px;border-radius:999px}
.gpu{font-size:10px;font-weight:800;letter-spacing:.8px;color:#f0aa28;border:1px solid rgba(240,170,40,.4);padding:1px 6px;border-radius:4px}
.model p{font-size:14px;color:var(--mut);margin:10px 0 14px;min-height:42px}
.spec{display:flex;flex-direction:column;gap:4px;font-size:12.5px;color:var(--txt2)}
.spec span{display:flex;align-items:center;gap:7px}
.spec span::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--red2)}
.note{max-width:760px;margin:22px auto 0;text-align:center;font-size:14px;color:#f3d9a8;padding:12px 16px;border-radius:9px;
  background:rgba(240,170,40,.07);border:1px solid rgba(240,170,40,.25)}
.note b{color:#ffd27a}

.two-col{display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:start}
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:14px}
.steps li{counter-increment:s;position:relative;padding:16px 18px 16px 62px;background:var(--panel);border:1px solid var(--line2);border-radius:12px;font-size:15px;color:var(--txt2)}
.steps li::before{content:counter(s);position:absolute;left:18px;top:50%;transform:translateY(-50%);width:30px;height:30px;border-radius:50%;
  display:grid;place-items:center;font-weight:800;color:#fff;background:radial-gradient(circle at 35% 30%,#ff3550,#c00c27);box-shadow:0 0 14px rgba(255,30,60,.35)}
.steps b{color:#fff}
code{font-family:ui-monospace,Consolas,monospace;font-size:13px;background:#1a070b;padding:1px 6px;border-radius:5px}
.req{background:var(--panel);border:1px solid var(--line2);border-radius:12px;padding:22px 24px;margin-top:62px}
.req h3{margin:0 0 12px;font-size:16px}
.req ul{list-style:none;margin:0;padding:0}
.req li{display:flex;justify-content:space-between;gap:16px;padding:11px 0;border-top:1px solid var(--line);font-size:14px}
.req li:first-child{border-top:none}
.req li span{color:var(--mut);white-space:nowrap}
.req li b{font-weight:600;text-align:right}

.privacy{max-width:760px;margin:0 auto;text-align:center;padding-bottom:30px}
.privacy h3{font-size:16px;margin:0 0 8px}
.privacy p{font-size:14.5px;color:var(--mut);margin:0}.privacy b{color:#fff}

.foot{margin-top:50px;border-top:1px solid var(--line);padding:26px clamp(16px,4vw,48px);display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.brand.small .tile{width:28px;height:28px;border-radius:7px}.brand.small .tile img{width:21px;height:21px}.brand.small .wordmark{font-size:13px}
.foot .links{display:flex;gap:18px}
.foot a{font-size:14px;color:var(--txt2);text-decoration:none}.foot a:hover{color:#fff}
.copy{font-size:13px;color:var(--mut)}

@media (max-width:1000px){
  .hero{grid-template-columns:1fr;gap:36px;padding-top:44px}
  .feats,.models{grid-template-columns:1fr 1fr}
  .two-col{grid-template-columns:1fr}.req{margin-top:0}
}
@media (max-width:600px){
  .nav nav a:not(.nav-cta){display:none}
  .feats,.models{grid-template-columns:1fr}
  .key-card{padding:24px 18px}
  .req li{flex-direction:column;gap:2px}.req li b{text-align:left}
}