:root{--bg:#FFFFFF;--soft:#F6F6F3;--ink:#1A1C1F;--muted:#62676D;--line:#E4E5E1;--gold:#FCC000;--gold-dark:#E8B000;--err:#B42318;--ok:#1E6B45}
*{box-sizing:border-box}
html,body{margin:0}
body{min-height:100vh;display:flex;flex-direction:column;background:var(--soft);color:var(--ink);font-family:"Archivo",system-ui,sans-serif;font-size:17px;line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:inherit}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px;border-radius:4px}
[hidden]{display:none!important}

/* header */
.site-h{position:sticky;top:0;z-index:10;background:#fff;border-bottom:1px solid var(--line)}
.site-h .in{max-width:1072px;margin:0 auto;padding:0 20px;height:64px;display:flex;align-items:center;gap:16px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;font-stretch:108%;font-size:19px;letter-spacing:-0.01em;line-height:1}
.brand img{width:36px;height:36px;display:block}
.brand sup{font-size:10px;line-height:0;vertical-align:super}
.h-btn{margin-left:auto;display:inline-block;background:var(--ink);color:#fff;border:0;border-radius:8px;padding:9px 16px;font:inherit;font-size:15px;font-weight:650;line-height:1.2;text-decoration:none;white-space:nowrap;cursor:pointer}
.h-btn:hover{background:#000}
.h-btn.plain{background:transparent;color:var(--ink);border:2px solid var(--line);padding:7px 14px}
.h-btn.plain:hover{background:var(--soft)}

/* main */
main{flex:1;width:100%;max-width:480px;margin:0 auto;padding:56px 16px 64px}
main.wide{max-width:640px}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:32px 28px}
.card + .card{margin-top:16px}
@media (max-width:420px){.card{padding:26px 20px}}
.badge{width:56px;height:56px;display:block;margin:0 0 20px}
h1,h2{margin:0;line-height:1.15;font-stretch:108%;letter-spacing:-0.01em}
h1{font-size:30px;font-weight:800}
h2{font-size:19px;font-weight:700}
.sub{color:var(--muted);margin:10px 0 24px}
.small{font-size:15px;color:var(--muted)}

/* forms */
label{display:block;font-weight:650;font-size:15px;margin:0 0 6px}
input,select{width:100%;font:inherit;font-size:17px;padding:12px 14px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink);appearance:none;-webkit-appearance:none}
select{background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 20px) 50%,calc(100% - 15px) 50%;background-size:5px 5px;background-repeat:no-repeat;padding-right:40px}
input:focus,select:focus{outline:none;border-color:var(--ink);box-shadow:0 0 0 3px rgba(252,192,0,.45)}
.code{font-size:28px;font-weight:700;letter-spacing:10px;text-align:center;font-variant-numeric:tabular-nums}
.field{margin-bottom:16px}
.btn{display:block;width:100%;font:inherit;font-weight:650;font-size:17px;padding:14px 22px;border-radius:8px;border:2px solid var(--gold);background:var(--gold);color:var(--ink);cursor:pointer;text-align:center;text-decoration:none}
.btn:hover{background:var(--gold-dark);border-color:var(--gold-dark)}
.btn:disabled{opacity:.6;cursor:default}
.link{background:none;border:0;padding:0;font:inherit;color:var(--ink);font-weight:650;text-decoration:underline;text-decoration-color:var(--gold);text-decoration-thickness:3px;text-underline-offset:4px;cursor:pointer}
.msg{min-height:22px;font-size:15px;margin:12px 0 0;color:var(--muted)}
.msg.err{color:var(--err)}
.msg.ok{color:var(--ok)}
.fine{font-size:14px;color:var(--muted);margin:20px auto 0;text-align:center;max-width:400px;line-height:1.6}

/* account */
.courses{list-style:none;margin:12px 0 0;padding:0}
.courses li{padding:10px 0;border-top:1px solid var(--line)}
.courses li:first-child{border-top:0}
.empty{color:var(--muted);margin:8px 0 0}

/* footer */
.site-f{background:var(--soft);border-top:1px solid var(--line);font-size:15px;color:var(--muted)}
.site-f .in{max-width:1072px;margin:0 auto;padding:28px 20px;display:flex;flex-wrap:wrap;gap:10px 24px}
.site-f a{color:var(--muted);text-decoration:none}
.site-f a:hover{color:var(--ink)}
.site-f p{width:100%;margin:6px 0 0;font-size:14px}
input::placeholder{color:#A9ADB2;opacity:1}
.code::placeholder{color:#D3D5D8;font-weight:600}
.link:disabled{color:var(--muted);text-decoration-color:var(--line);cursor:default}