:root{--bg:#061017;--panel:#0c1b24;--line:#1b3948;--ink:#f7fafb;--muted:#91a8b4;--accent:#4ee8ca;--accent2:#7ea6ff;--danger:#ff6c76;--ok:#63d69d}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 50% -10%,#173746 0,#08141c 38%,#04090d 100%);color:var(--ink);font-family:Inter,system-ui,Arial,sans-serif;min-height:100vh}.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:14px;padding:15px max(18px,calc((100vw - 1080px)/2));background:#061017e8;border-bottom:1px solid #183541;backdrop-filter:blur(16px)}.top a{color:#bfd0d7;text-decoration:none}.brand{flex:1}.brand b{display:block;letter-spacing:.09em}.brand small{color:var(--muted)}.pill{border:1px solid #31596a;border-radius:999px;padding:7px 12px}.wrap{max-width:1080px;margin:auto;padding:32px 18px 90px}.hero h1{font-size:clamp(2.5rem,8vw,5.3rem);line-height:.94;margin:7px 0 14px}.hero p{color:#b4c6ce;max-width:760px}.eyebrow{font-size:.78rem;letter-spacing:.18em;color:var(--accent);font-weight:900}.bar{height:8px;border-radius:99px;background:#132a35;overflow:hidden;margin:20px 0 26px}.bar span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));transition:.3s}.card{background:linear-gradient(180deg,#0e202a,#09161d);border:1px solid var(--line);border-radius:24px;padding:23px;margin:19px 0;box-shadow:0 18px 55px #0007}.head{display:flex;gap:13px;margin-bottom:17px}.num{display:grid;place-items:center;flex:0 0 42px;height:42px;border-radius:13px;background:#13303c;color:var(--accent);border:1px solid #295363;font-weight:900}.head h2{margin:0 0 4px}.head p{margin:0;color:var(--muted)}video{width:100%;border-radius:17px;background:#000;max-height:600px}.locked{opacity:.42;pointer-events:none;filter:saturate(.5)}.hidden{display:none!important}.ok{color:var(--ok);font-weight:800;margin-top:12px}.vocab{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:11px}.vcard{background:#08141a;border:1px solid #224552;border-radius:16px;padding:15px}.vcard.done{border-color:#2b7b62;background:#0d211b}.vcard strong{font-size:1.2rem}.meaning{color:#9bb2bd;margin:5px 0 11px}button,.primary{border:0;border-radius:12px;padding:11px 14px;font-weight:900;cursor:pointer}.speak{background:#17323e;color:#e1edf1}.learn,.primary{background:linear-gradient(90deg,var(--accent),#74c8ff);color:#031016}.mission-note{padding:18px;border-radius:17px;background:#071319;border:1px dashed #315363;margin-bottom:16px;color:#c8d7de}.form-grid{display:grid;gap:12px}.q{border:1px solid #244552;border-radius:15px;padding:14px}.q legend{font-weight:850}.q label{display:block;padding:6px 0;color:#c9d8de}.audio{display:flex;align-items:center;gap:14px;background:#071319;border:1px solid #284b59;border-radius:17px;padding:16px;margin-bottom:15px}.play{width:54px;height:54px;border-radius:50%;background:#806cff;color:#fff;font-size:1.15rem}.feedback{margin-top:12px;font-weight:850}.good{color:var(--ok)}.bad{color:var(--danger)}.codebox{display:flex;align-items:center;gap:12px}.codebox input{background:#050d11;border:1px solid #315565;color:#fff;border-radius:14px;padding:12px;font-size:2rem;letter-spacing:.25em;text-align:center;min-width:190px}.complete{text-align:center;border-color:#386d60;background:radial-gradient(circle at 50% 0,#173f34,#09161d 55%)}.badge{width:84px;height:84px;margin:auto;border-radius:26px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#031016;font-weight:950;font-size:2.4rem}.toast{position:fixed;left:50%;bottom:22px;transform:translate(-50%,30px);opacity:0;background:#fff;color:#061117;padding:12px 17px;border-radius:13px;font-weight:850;transition:.25s}.toast.show{opacity:1;transform:translate(-50%,0)}@media(max-width:640px){.card{padding:17px}.codebox{flex-direction:column;align-items:stretch}.codebox input{width:100%}}