:root{--bg:#0b1020;--bg2:#121a33;--card:#161f3d;--fg:#eaf0ff;--mut:#9fb0d8;--accent:#7c5cff;--accent2:#22d3ee;--ok:#34d399;--err:#f87171;--line:#243056}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--fg);background:var(--bg);line-height:1.6}
a{color:inherit;text-decoration:none}
.nav{display:flex;align-items:center;justify-content:space-between;padding:18px 28px;position:sticky;top:0;background:rgba(11,16,32,.8);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:10}
.brand{font-weight:800;font-size:22px;letter-spacing:.5px;background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.nav nav{display:flex;align-items:center;gap:20px}
.nav a{color:var(--mut)}
.lang{background:var(--bg2);border:1px solid var(--line);color:var(--fg);border-radius:8px;padding:6px 28px 6px 12px;cursor:pointer;font-size:14px;appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239fb0d8' d='M6 8L2 4h8z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center}
.lang option{background:var(--bg2);color:var(--fg)}
.btn,.btn-ghost{display:inline-block;border-radius:10px;padding:10px 18px;font-weight:600;cursor:pointer}
.btn{background:linear-gradient(90deg,var(--accent),var(--accent2));color:#0b1020;border:0}
.btn-ghost{border:1px solid var(--accent);color:var(--fg)}
.hero{max-width:820px;margin:0 auto;padding:96px 24px 64px;text-align:center}
.hero h1{font-size:clamp(32px,6vw,54px);line-height:1.1;margin:0 0 18px;background:linear-gradient(90deg,#fff,var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:19px;color:var(--mut);margin:0 auto 28px;max-width:640px}
.features{max-width:1040px;margin:0 auto;padding:32px 24px;display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px}
.card h3{margin:0 0 8px;font-size:18px}
.card p{margin:0;color:var(--mut)}
.how{max-width:760px;margin:0 auto;padding:56px 24px}
.how h2{text-align:center;font-size:30px;margin-bottom:24px}
.how ol{counter-reset:s;list-style:none;padding:0}
.how li{counter-increment:s;background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:16px 18px 16px 58px;margin-bottom:12px;position:relative}
.how li::before{content:counter(s);position:absolute;left:16px;top:14px;width:28px;height:28px;border-radius:50%;background:linear-gradient(90deg,var(--accent),var(--accent2));color:#0b1020;font-weight:700;display:grid;place-items:center}
.register{max-width:440px;margin:0 auto;padding:48px 24px 80px}
.register h2{text-align:center;font-size:28px;margin-bottom:20px}
#reg-form{display:flex;flex-direction:column;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px}
#reg-form label{font-size:14px;color:var(--mut);margin-top:8px}
#reg-form input{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:12px;color:var(--fg);font-size:15px}
#reg-form input:focus{outline:none;border-color:var(--accent)}
#reg-form small{color:var(--mut);font-size:12px}
#reg-form button{margin-top:16px;background:linear-gradient(90deg,var(--accent),var(--accent2));color:#0b1020;border:0;border-radius:10px;padding:12px;font-weight:700;font-size:16px;cursor:pointer}
.msg{min-height:20px;margin:10px 0 0;font-size:14px}
.msg.ok{color:var(--ok)} .msg.err{color:var(--err)}
footer{text-align:center;padding:32px;color:var(--mut);border-top:1px solid var(--line)}