:root{
  --bg:#06162f;--panel:#0d2a50;--panel2:#123864;--ink:#f7fbff;--muted:#cbd9eb;
  --blue:#2aa7ff;--green:#62dc58;--orange:#ff9d31;--purple:#ab62ff;--danger:#ff6b6b;
  --shadow:0 18px 50px rgba(0,0,0,.28);--radius:24px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-rounded,"Segoe UI",Arial,sans-serif;background:radial-gradient(circle at top,#143e72 0,#071a38 35%,#041126 100%);color:var(--ink);min-height:100vh}
button{font:inherit}.topbar{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;padding:12px clamp(14px,4vw,36px);background:rgba(5,19,42,.84);backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,255,255,.1)}
.brand{display:flex;align-items:center;gap:10px;background:none;border:0;color:white;text-align:left;cursor:pointer}.brand strong{display:block;font-size:1rem}.brand small{display:block;color:var(--muted)}.brand-mark{display:grid;place-items:center;width:46px;height:46px;border-radius:14px;background:linear-gradient(135deg,#2da8ff,#6ce75e);font-weight:900;color:#06162f;box-shadow:0 8px 20px rgba(42,167,255,.25)}
.statusbar{display:flex;gap:8px}.pill,.score-pill{background:#0f315a;border:1px solid rgba(255,255,255,.14);padding:9px 13px;border-radius:999px;font-weight:800;box-shadow:0 8px 18px rgba(0,0,0,.16)}
.screen{display:none}.screen.active{display:block}.hero{min-height:72vh;background:linear-gradient(90deg,rgba(1,11,28,.86) 0,rgba(1,11,28,.48) 42%,rgba(1,11,28,.08) 72%),url('assets/start.jpg') center/cover no-repeat;display:flex;align-items:flex-end;padding:clamp(24px,6vw,70px)}
.hero-overlay{max-width:680px;padding:clamp(20px,3vw,34px);border-radius:28px;background:linear-gradient(180deg,rgba(4,18,42,.58),rgba(4,18,42,.88));border:1px solid rgba(255,255,255,.14);box-shadow:var(--shadow);backdrop-filter:blur(6px)}
.hero h1{font-size:clamp(2.5rem,7vw,5.5rem);margin:.1em 0;line-height:.9;letter-spacing:-.05em}.hero p{font-size:clamp(1rem,2vw,1.25rem);line-height:1.55;color:#e7f0fb}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.74rem;font-weight:900;color:#80d5ff}
.primary,.ghost{border:0;border-radius:16px;padding:13px 18px;font-weight:900;cursor:pointer;transition:.2s transform,.2s filter}.primary{background:linear-gradient(180deg,#79eb62,#44c53c);color:#073018;box-shadow:0 8px 0 #248f2a,0 15px 30px rgba(77,206,67,.25)}.primary:hover{filter:brightness(1.06);transform:translateY(-1px)}.primary:active{transform:translateY(4px);box-shadow:0 4px 0 #248f2a}.primary.big{font-size:1.1rem;padding:16px 24px}.ghost{background:#17385f;color:white;border:1px solid rgba(255,255,255,.16)}.ghost.danger{color:#ffd0d0}.ghost:hover{filter:brightness(1.12)}
.panel{padding:clamp(22px,4vw,42px)}.panel-head{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:20px}.panel h2{font-size:clamp(1.7rem,4vw,2.5rem);margin:.1em 0}.level-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.level-card{position:relative;min-height:290px;border-radius:22px;overflow:hidden;background:#0c2a4f;border:1px solid rgba(255,255,255,.13);box-shadow:var(--shadow);cursor:pointer;isolation:isolate}.level-card::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 25%,rgba(3,14,31,.92) 88%);z-index:1}.level-card img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0;transition:.3s transform}.level-card:hover img{transform:scale(1.04)}.level-card-content{position:absolute;z-index:2;left:18px;right:18px;bottom:16px}.level-card h3{font-size:1.55rem;margin:5px 0}.level-card p{margin:0;color:#d7e4f4;font-size:.92rem}.lock{position:absolute;z-index:3;inset:0;display:grid;place-items:center;background:rgba(5,13,27,.63);backdrop-filter:blur(3px)}.lock div{text-align:center}.lock .lock-icon{font-size:2.8rem}.lock strong{display:block;font-size:1.05rem}.level-badge{display:inline-flex;gap:6px;align-items:center;padding:6px 9px;border-radius:999px;background:rgba(8,35,67,.82);border:1px solid rgba(255,255,255,.14);font-size:.78rem;font-weight:800}.completed{outline:3px solid rgba(98,220,88,.75)}
.level-hero{min-height:calc(100vh - 72px);background-position:center;background-size:cover;position:relative;display:flex;align-items:flex-end;padding:clamp(20px,5vw,60px)}.level-hero::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(3,15,33,.88),rgba(3,15,33,.35) 65%,rgba(3,15,33,.12))}.backBtn{position:absolute;z-index:2;top:22px;left:22px;border:1px solid rgba(255,255,255,.2);background:rgba(7,29,57,.82);color:white;border-radius:14px;padding:10px 14px;font-weight:800;cursor:pointer}.backBtn.dark{position:static}.level-title-card{position:relative;z-index:2;max-width:650px;padding:26px;border-radius:24px;background:rgba(5,25,52,.85);border:1px solid rgba(255,255,255,.15);backdrop-filter:blur(7px);box-shadow:var(--shadow)}.level-title-card h1{font-size:clamp(2.5rem,6vw,4.8rem);line-height:.95;margin:.15em 0}.level-title-card p{font-size:1.1rem;line-height:1.5;color:#e3edf8}.level-meta{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 22px}.level-meta span{font-size:.82rem;font-weight:800;background:#133c69;border-radius:999px;padding:7px 10px;border:1px solid rgba(255,255,255,.12)}
.quiz-shell{min-height:calc(100vh - 72px);padding:clamp(14px,3vw,36px);background:radial-gradient(circle at 20% 10%,#174e85,#071a38 45%,#031024)}.quiz-top{display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:center;max-width:1000px;margin:0 auto 24px}.quiz-progress-label{display:flex;justify-content:space-between;font-size:.85rem;font-weight:800;color:#dbe7f5;margin-bottom:7px}.progress{height:12px;background:#102a49;border-radius:999px;overflow:hidden;border:1px solid rgba(255,255,255,.13)}.progress>div{height:100%;width:0;background:linear-gradient(90deg,#2aa7ff,#70e85d);transition:.3s width}.question-card{max-width:860px;margin:auto;background:linear-gradient(180deg,#f9f4e6,#fffdf8);color:#11243a;border-radius:28px;padding:clamp(22px,5vw,46px);box-shadow:0 24px 70px rgba(0,0,0,.35);border:6px solid #d9c99f}.question-number{font-weight:900;color:#55708d;text-transform:uppercase;letter-spacing:.09em;font-size:.78rem}.question-card h2{font-size:clamp(1.6rem,4vw,2.45rem);line-height:1.18}.answers{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:24px}.answer{border:2px solid #d6dfe8;background:white;border-radius:17px;padding:17px;text-align:left;font-weight:800;font-size:1rem;cursor:pointer;transition:.18s}.answer:hover{border-color:#4fb9ff;transform:translateY(-1px)}.answer.correct{background:#e9ffe5;border-color:#58cc50}.answer.wrong{background:#ffe8e8;border-color:#ff7b7b}.answer:disabled{cursor:default}.feedback{min-height:44px;margin-top:18px;font-weight:800;line-height:1.45}.feedback.good{color:#22822b}.feedback.bad{color:#a32828}.next{display:block;margin-left:auto}.hidden{display:none!important}
.result-wrap{min-height:calc(100vh - 72px);display:grid;place-items:center;padding:24px;background:radial-gradient(circle at center,#174c81,#071a38 55%,#020b1b)}.result-card{width:min(760px,100%);text-align:center;padding:clamp(26px,5vw,50px);border-radius:30px;background:#f8f2df;color:#14263c;border:6px solid #d8c48c;box-shadow:0 24px 80px rgba(0,0,0,.45)}.result-icon{font-size:4rem}.result-card h1{font-size:clamp(2rem,5vw,3.2rem);margin:.15em 0}.result-card p{font-size:1.05rem;color:#4c5e70;line-height:1.55}.result-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:26px 0}.result-stats div{background:#fff;border:1px solid #e4dcc6;border-radius:18px;padding:16px}.result-stats strong{font-size:1.5rem;display:block}.result-stats span{font-size:.8rem;color:#617182}.result-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
@media(max-width:980px){.level-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.topbar{padding:10px 12px}.brand strong{font-size:.9rem}.brand small{font-size:.7rem}.brand-mark{width:40px;height:40px}.hero{min-height:68vh;padding:16px;background-position:57% center}.hero-overlay{padding:18px}.hero h1{font-size:2.6rem}.panel{padding:18px 12px}.panel-head{align-items:flex-start;flex-direction:column}.level-grid{grid-template-columns:1fr}.level-card{min-height:245px}.level-title-card{padding:20px}.level-meta{gap:6px}.quiz-shell{padding:12px}.quiz-top{grid-template-columns:auto 1fr}.score-pill{grid-column:2;justify-self:end}.answers{grid-template-columns:1fr}.question-card{border-width:4px;padding:20px 16px}.result-stats{grid-template-columns:1fr}.statusbar .pill{padding:8px 10px}.backBtn{top:14px;left:14px}.level-hero{padding:14px;align-items:flex-end}}