:root{
  --navy:#12304a;--blue:#2f6f91;--blue2:#eaf4f8;--green:#5f9b82;--green2:#edf7f2;
  --amber:#d69a3a;--amber2:#fff7e8;--red:#b94c4c;--red2:#fff0f0;--ink:#173042;
  --muted:#637887;--line:#dce7ec;--bg:#f6f9fb;--white:#fff;--shadow:0 12px 34px rgba(18,48,74,.10);
  --radius:20px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.5}
button,input{font:inherit}
button{cursor:pointer}
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:12px max(18px,calc((100vw - 1120px)/2));background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:11px;color:var(--navy);text-decoration:none}
.brand-mark{display:grid;place-items:center;width:48px;height:48px;border-radius:14px;background:var(--navy);color:#fff;font-weight:900;font-size:13px;letter-spacing:.08em}
.brand strong,.brand small{display:block}.brand small{color:var(--muted);font-size:12px}
.top-actions{display:flex;gap:8px}.icon-btn{border:1px solid var(--line);background:#fff;color:var(--navy);border-radius:12px;padding:9px 12px;font-weight:700}
.container{width:min(1120px,calc(100% - 28px));margin:30px auto 54px}
.hero{display:grid;grid-template-columns:1.4fr .8fr;gap:24px;align-items:stretch;margin-bottom:28px}
.hero-main,.hero-side,.panel,.quiz-card,.result-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero-main{padding:36px}.eyebrow{display:inline-flex;background:var(--blue2);color:var(--blue);border-radius:999px;padding:6px 11px;font-weight:800;font-size:12px;letter-spacing:.04em;text-transform:uppercase}
h1{margin:14px 0 10px;font-size:clamp(32px,5vw,54px);line-height:1.03;color:var(--navy);letter-spacing:-.035em}
h2,h3{color:var(--navy);line-height:1.15}.lead{font-size:18px;color:var(--muted);max-width:720px}
.hero-side{padding:26px;background:linear-gradient(145deg,var(--navy),#214f6e);color:#fff}
.hero-side h3{color:#fff;margin-top:0}.hero-side ul{padding-left:20px}.hero-side li{margin:8px 0}
.mode-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.btn{border:0;border-radius:13px;padding:12px 17px;font-weight:800;transition:.18s transform,.18s box-shadow}.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--navy);color:#fff}.btn-secondary{background:var(--blue2);color:var(--navy)}.btn-green{background:var(--green);color:#fff}.btn-ghost{background:#fff;color:var(--navy);border:1px solid var(--line)}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin:28px 2px 14px}.section-head h2{margin:0}.section-head p{margin:0;color:var(--muted)}
.blocks{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.block-card{position:relative;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 7px 20px rgba(18,48,74,.06)}
.block-card .icon{font-size:30px}.block-card h3{margin:9px 0 6px}.block-card p{color:var(--muted);margin:0 0 18px}
.progress{height:9px;background:#edf2f4;border-radius:999px;overflow:hidden}.progress>span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--green));border-radius:999px}
.progress-label{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin:7px 0 14px}
.levels{display:flex;gap:8px;flex-wrap:wrap}.level-btn{flex:1;min-width:90px;border:1px solid var(--line);background:#fff;border-radius:11px;padding:9px;font-weight:800;color:var(--navy)}.level-btn:hover{background:var(--blue2)}
.panel{padding:28px}.level-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0}.level-card{border:2px solid var(--line);border-radius:16px;padding:20px;background:#fff;text-align:left}.level-card:hover{border-color:#91b8cb}.level-card strong{display:block;color:var(--navy);font-size:18px}.level-card span{display:block;color:var(--muted);font-size:13px;margin-top:5px}
.level-basic{border-top:5px solid var(--green)}.level-medium{border-top:5px solid var(--blue)}.level-reto{border-top:5px solid var(--amber)}
.quiz-wrap{max-width:840px;margin:auto}.quiz-meta{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:12px;color:var(--muted);font-weight:700;font-size:13px}.quiz-card{padding:clamp(22px,4vw,38px)}
.badge{display:inline-flex;border-radius:999px;padding:5px 9px;font-size:12px;font-weight:900}.badge-basic{background:var(--green2);color:#39745c}.badge-medium{background:var(--blue2);color:#2a6584}.badge-reto{background:var(--amber2);color:#9a6514}
.question{font-size:clamp(20px,3vw,28px);font-weight:800;color:var(--navy);margin:16px 0 24px}.question table{width:100%;border-collapse:collapse;font-size:15px;margin-top:14px}.question th,.question td{border:1px solid var(--line);padding:8px;text-align:center}
.options{display:grid;gap:10px}.option{border:2px solid var(--line);background:#fff;border-radius:13px;padding:13px 15px;text-align:left;color:var(--ink);font-weight:650}.option:hover:not(:disabled){border-color:#8bb5ca;background:#f8fcfe}.option.selected{border-color:var(--blue);background:var(--blue2)}
.option.correct{border-color:var(--green);background:var(--green2)}.option.wrong{border-color:var(--red);background:var(--red2)}
.number-row{display:flex;gap:10px}.number-row input{flex:1;border:2px solid var(--line);border-radius:13px;padding:13px 15px;font-size:18px;outline:none}.number-row input:focus{border-color:var(--blue)}
.feedback{margin-top:18px;border-radius:14px;padding:15px 17px}.feedback.good{background:var(--green2);border:1px solid #b8ddcc}.feedback.bad{background:var(--red2);border:1px solid #efc4c4}.feedback.hint{background:var(--amber2);border:1px solid #f0d39f}.feedback strong{display:block;margin-bottom:4px}
.quiz-actions{display:flex;justify-content:space-between;gap:10px;margin-top:20px}.question-progress{height:8px;background:#e9eff2;border-radius:999px;overflow:hidden;margin-bottom:18px}.question-progress span{display:block;height:100%;background:var(--blue)}
.result-card{max-width:760px;margin:auto;padding:36px;text-align:center}.score-ring{width:128px;height:128px;border-radius:50%;display:grid;place-items:center;margin:16px auto;background:conic-gradient(var(--green) var(--score),#e9eff2 0);position:relative}.score-ring::after{content:"";position:absolute;inset:11px;background:#fff;border-radius:50%}.score-ring strong{z-index:1;font-size:28px;color:var(--navy)}
.review{margin-top:28px;text-align:left}.review-item{border-top:1px solid var(--line);padding:15px 0}.review-item p{margin:4px 0}.ok{color:#36775a}.ko{color:var(--red)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:18px}.stat{background:#f7fafb;border-radius:14px;padding:13px}.stat strong{display:block;color:var(--navy);font-size:20px}.stat span{font-size:12px;color:var(--muted)}
.notice{background:var(--amber2);border:1px solid #f1d7a8;border-radius:14px;padding:13px 15px;color:#775018}
.calculator{position:fixed;right:18px;bottom:18px;z-index:50;width:min(320px,calc(100vw - 36px));background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 22px 70px rgba(18,48,74,.25);padding:15px;transform:translateY(130%);transition:.22s}.calculator.open{transform:translateY(0)}.calc-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;color:var(--navy)}.calc-head button{border:0;background:#eef3f5;border-radius:9px;width:32px;height:32px}.calculator input{width:100%;border:2px solid var(--line);border-radius:12px;padding:13px;text-align:right;font-size:22px;margin-bottom:9px}.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}.calc-grid button{border:0;border-radius:10px;padding:12px;background:#edf3f5;color:var(--navy);font-weight:850}.calc-grid .op{background:var(--blue2)}.calc-grid .equals{background:var(--navy);color:#fff}.calc-grid .muted{background:var(--red2);color:var(--red)}.calc-note{font-size:11px;color:var(--muted);margin:10px 2px 0}
footer{width:min(1120px,calc(100% - 28px));margin:0 auto 24px;padding-top:18px;border-top:1px solid var(--line);display:flex;justify-content:space-between;color:var(--muted);font-size:12px}
@media(max-width:760px){.hero{grid-template-columns:1fr}.blocks{grid-template-columns:1fr}.level-grid{grid-template-columns:1fr}.stats-grid{grid-template-columns:repeat(2,1fr)}.icon-btn span{display:none}.hero-main{padding:25px}.panel{padding:20px}.number-row{flex-direction:column}.quiz-actions{flex-wrap:wrap}.quiz-actions .btn{flex:1}}