:root{
  --bg:#0a0e1a; --panel:#111726; --panel2:#161d2f; --line:#243049;
  --text:#e9edf6; --muted:#8792ab; --accent:#2b8fff; --accent2:#4db8ff;
  --grad:linear-gradient(180deg,#4db8ff,#1560e0);
  --ok:#31c46b; --err:#ff5c6c; --radius:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
a{color:var(--accent);text-decoration:none}
.accent{color:var(--accent)}
.muted{color:var(--muted)}
.hidden{display:none!important}
h1,h2,h3{line-height:1.2}

/* Nav */
.nav{display:flex;align-items:center;justify-content:space-between;padding:16px 32px;border-bottom:1px solid var(--line);
  position:sticky;top:0;background:rgba(10,14,26,.86);backdrop-filter:blur(10px);z-index:10}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--text)}
.brandlogo{width:32px;height:32px;object-fit:contain}
.navlinks{display:flex;align-items:center;gap:22px}
.navlinks a{color:var(--muted);font-size:15px;font-weight:500}
.navlinks a:hover{color:var(--text)}
.navauth{display:flex;gap:10px}

/* Buttons */
.btn{font:inherit;font-size:15px;font-weight:700;border:none;border-radius:10px;padding:10px 18px;cursor:pointer}
.btn.primary{background:var(--grad);color:#fff}
.btn.primary:hover{filter:brightness(1.08)}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--text)}
.btn.ghost:hover{border-color:var(--accent)}
.btn.lg{padding:14px 26px;font-size:16px}
.btn.full{width:100%;padding:13px}

/* Hero */
.hero{padding:90px 24px 70px;text-align:center;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(1000px 460px at 50% -10%,rgba(43,143,255,.22),transparent 70%);pointer-events:none}
.hero-inner{max-width:820px;margin:0 auto;position:relative}
.hero h1{font-size:clamp(34px,6vw,60px);font-weight:900;margin:0 0 18px;letter-spacing:-.5px}
.lead{font-size:clamp(17px,2.4vw,21px);color:#c7d0e4;margin:0 auto 30px;max-width:640px}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-sub{margin-top:22px;color:var(--muted);font-size:14px}

/* Sections */
.section{max-width:1080px;margin:0 auto;padding:66px 24px}
.section.alt{background:var(--panel);border-top:1px solid var(--line);border-bottom:1px solid var(--line);max-width:none}
.section.alt>*{max-width:1080px;margin-left:auto;margin-right:auto}
.section h2{font-size:clamp(26px,4vw,34px);text-align:center;margin:0 0 40px}

/* Features */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.feature{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px}
.section.alt .feature{background:var(--panel2)}
.feature .fi{font-size:30px;margin-bottom:12px}
.feature h3{font-size:18px;margin:0 0 8px}
.feature p{color:var(--muted);font-size:14.5px;margin:0}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.step{text-align:center;padding:10px}
.stepno{width:46px;height:46px;border-radius:50%;background:var(--grad);color:#fff;font-weight:800;font-size:20px;
  display:flex;align-items:center;justify-content:center;margin:0 auto 14px}
.step h3{font-size:18px;margin:0 0 8px}
.step p{color:var(--muted);font-size:14.5px;margin:0}
.how-cta{text-align:center;margin-top:40px}

/* Footer */
.foot{border-top:1px solid var(--line);padding:30px 24px;text-align:center;color:var(--muted);font-size:14px;display:flex;flex-direction:column;gap:6px}

/* Auth modal */
.modal{position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;padding:20px}
.modal-bg{position:absolute;inset:0;background:rgba(4,7,14,.74);backdrop-filter:blur(4px)}
.authcard{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:30px 30px 26px;
  width:100%;max-width:400px;box-shadow:0 30px 80px rgba(0,0,0,.6)}
.authclose{position:absolute;top:12px;right:16px;background:none;border:none;color:var(--muted);font-size:26px;cursor:pointer;line-height:1}
.authlogo{width:56px;height:56px;object-fit:contain;display:block;margin:0 auto 14px}
.tabs{display:flex;background:var(--panel2);border-radius:10px;padding:4px;margin-bottom:20px}
.tab{flex:1;background:none;border:none;color:var(--muted);font:inherit;font-weight:700;padding:9px;border-radius:8px;cursor:pointer}
.tab.active{background:var(--panel);color:var(--text);box-shadow:0 1px 4px rgba(0,0,0,.3)}
.authform{display:flex;flex-direction:column;gap:14px}
.authform label{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--muted)}
.authform input{background:var(--panel2);border:1px solid var(--line);color:var(--text);padding:12px 13px;border-radius:10px;outline:none;font:inherit}
.authform input:focus{border-color:var(--accent)}
.authform .hint{font-size:11px;color:var(--muted)}
.formerr{color:var(--err);font-size:13px;min-height:18px;text-align:center}

/* Min side */
.account-main{max-width:760px;margin:0 auto;padding:50px 24px}
.account-main h1{font-size:30px;margin:0 0 24px}
.who{color:var(--muted);font-size:14px;margin-right:6px}
.acard{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.acard h3{margin:0 0 10px}
.acard p{margin:0 0 12px}
.acard .btn{margin-top:8px;display:inline-block}

@media(max-width:860px){.features{grid-template-columns:repeat(2,1fr)}.steps{grid-template-columns:1fr}}
@media(max-width:560px){.features{grid-template-columns:1fr}.nav{padding:14px 18px}.navlinks a{display:none}}