:root{--ink:#102a43;--muted:#627d98;--paper:#f4f7fb;--white:#fff;--blue:#1769e0;--navy:#0b3a67;--cyan:#16b8d4;--yellow:#ffc857;--green:#19a974;--red:#d64545;--line:#d9e2ec;--shadow:0 18px 55px rgba(16,42,67,.12)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;min-height:100vh}
button{font:inherit}
.topbar{height:76px;padding:0 clamp(18px,5vw,72px);display:flex;align-items:center;justify-content:space-between;background:var(--white);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.brand{display:flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none;font-weight:800;letter-spacing:-.02em}
.brand-mark{width:38px;height:38px;display:grid;place-items:center;border-radius:12px;background:var(--blue);color:#fff;font-size:1.25rem}
.progress-wrap{display:none;width:min(360px,42vw);font-size:.84rem;color:var(--muted);font-weight:700}
.progress-wrap.active{display:block}
.progress-track{height:7px;background:#e8eef5;border-radius:10px;margin-top:7px;overflow:hidden}
.progress-bar{height:100%;width:0;background:linear-gradient(90deg,var(--blue),var(--cyan));border-radius:10px;transition:width .35s ease}
.app-shell{max-width:1240px;margin:auto;padding:clamp(24px,5vw,68px) clamp(18px,4vw,48px)}
.hidden{display:none!important}
.start-screen{display:grid;grid-template-columns:1.14fr .86fr;gap:30px;align-items:stretch}
.intro-card,.result-card{background:var(--navy);color:#fff;border-radius:30px;padding:clamp(32px,6vw,72px);box-shadow:var(--shadow);position:relative;overflow:hidden}
.intro-card:after{content:"";position:absolute;width:340px;height:340px;border:70px solid rgba(255,255,255,.05);border-radius:50%;right:-190px;top:-170px}
.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-weight:800;font-size:.76rem;color:var(--cyan);margin:0 0 16px}
h1{font-size:clamp(2.6rem,6vw,5.4rem);line-height:.94;letter-spacing:-.06em;margin:0 0 28px;max-width:760px}
h1 span{color:var(--yellow)}
.lead{font-size:clamp(1rem,1.6vw,1.2rem);line-height:1.65;color:#d9eaf5;max-width:660px}
.start-meta,.result-stats{display:flex;gap:clamp(20px,4vw,48px);margin:34px 0}
.start-meta div,.result-stats div{display:flex;flex-direction:column}
.start-meta strong,.result-stats strong{font-size:1.65rem;color:#fff}
.start-meta span,.result-stats span{color:#b9d2e3;font-size:.82rem;margin-top:2px}
.primary-btn{border:0;border-radius:14px;background:var(--yellow);color:#18324a;font-weight:850;padding:15px 20px;cursor:pointer;box-shadow:0 8px 20px rgba(0,0,0,.14);transition:transform .18s,filter .18s}
.primary-btn:hover{transform:translateY(-2px);filter:brightness(1.03)}
.primary-btn span{margin-left:12px}
.note{font-size:.76rem;color:#a9c6d9;margin:22px 0 0;line-height:1.5}
.topic-stack{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.topic-card{min-height:150px;border-radius:22px;padding:22px;color:#fff;display:flex;flex-direction:column;justify-content:flex-end;box-shadow:var(--shadow);position:relative;overflow:hidden}
.topic-card:first-child{grid-column:1/-1;min-height:178px}
.topic-card span{position:absolute;top:17px;right:19px;font-weight:900;opacity:.5}
.topic-card b{font-size:1.12rem}.topic-card small{opacity:.82;margin-top:5px}
.sun{background:linear-gradient(135deg,#ef8d22,#ffd166)}.car{background:linear-gradient(135deg,#1769e0,#59a5ff)}.heat{background:linear-gradient(135deg,#d64545,#ff7b72)}.air{background:linear-gradient(135deg,#078d89,#3dcfc6)}.moon{background:linear-gradient(135deg,#4338a8,#8467d7)}
.quiz-screen{display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);gap:24px;align-items:start}
.case-panel,.question-panel{background:#fff;border-radius:26px;padding:clamp(24px,4vw,42px);box-shadow:var(--shadow)}
.case-panel{position:sticky;top:100px}
.case-panel h2{font-size:clamp(1.7rem,3vw,2.7rem);letter-spacing:-.04em;margin:0 0 20px}
.case-text{font-size:1rem;line-height:1.7;color:#486581}
.case-visual{border-radius:18px;background:#edf5ff;padding:18px;margin:0 0 22px;min-height:150px;display:grid;place-items:center;overflow:auto}
.data-table{border-collapse:collapse;width:100%;min-width:310px;font-size:.9rem;background:#fff;border-radius:12px;overflow:hidden}
.data-table th,.data-table td{padding:11px 12px;text-align:center;border-bottom:1px solid #e3eaf2}.data-table th{background:#dcecff;color:#174b7a}.data-table tr:last-child td{border:0}
.bar-chart{width:100%;display:flex;align-items:flex-end;justify-content:space-around;gap:12px;height:160px;padding-top:15px}
.bar{width:19%;background:linear-gradient(#22b8cf,#1769e0);border-radius:8px 8px 3px 3px;position:relative;min-height:12px}.bar span{position:absolute;bottom:calc(100% + 5px);left:50%;transform:translateX(-50%);font-size:.78rem;font-weight:800}.bar small{position:absolute;top:calc(100% + 6px);left:50%;transform:translateX(-50%);font-size:.7rem;white-space:nowrap}
.question-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.pill{background:#e7f1ff;color:#1257a6;border-radius:999px;padding:7px 11px;font-size:.78rem;font-weight:800}.live-score{font-weight:850;color:var(--blue)}
.question-panel h3{font-size:clamp(1.35rem,2.4vw,2rem);line-height:1.25;letter-spacing:-.025em;margin:0 0 26px}
.answers{display:grid;gap:12px}
.answer-btn{width:100%;display:flex;gap:14px;align-items:flex-start;text-align:left;padding:16px;border:2px solid #e2eaf2;border-radius:15px;background:#fff;color:var(--ink);cursor:pointer;line-height:1.45;transition:.18s}
.answer-btn:hover:not(:disabled){border-color:#8ebcf4;background:#f6faff;transform:translateX(3px)}
.answer-btn:disabled{cursor:default}.answer-letter{flex:0 0 30px;height:30px;border-radius:9px;background:#edf2f7;display:grid;place-items:center;font-weight:850}.answer-btn.correct{border-color:var(--green);background:#edfff7}.answer-btn.correct .answer-letter{background:var(--green);color:#fff}.answer-btn.wrong{border-color:var(--red);background:#fff3f3}.answer-btn.wrong .answer-letter{background:var(--red);color:#fff}
.feedback{margin-top:20px;padding:18px;border-radius:15px;line-height:1.55}.feedback.good{background:#eafaf4;border-left:5px solid var(--green)}.feedback.bad{background:#fff1f1;border-left:5px solid var(--red)}.feedback strong{display:block;margin-bottom:5px}.question-actions{display:flex;justify-content:flex-end;margin-top:20px}
.result-screen{max-width:800px;margin:auto}.result-card{text-align:center}.result-ring{--score:0deg;width:150px;height:150px;border-radius:50%;margin:10px auto 26px;background:conic-gradient(var(--yellow) var(--score),rgba(255,255,255,.12) 0);display:grid;place-items:center;position:relative}.result-ring:after{content:"";position:absolute;inset:12px;background:var(--navy);border-radius:50%}.result-ring span{position:relative;z-index:1;font-size:2rem;font-weight:900}.result-card h2{font-size:clamp(2rem,5vw,3.5rem);margin:0}.result-card .lead{margin:12px auto}.result-stats{justify-content:center}.topic-results{display:grid;gap:9px;margin:28px auto;max-width:520px;text-align:left}.topic-result{display:grid;grid-template-columns:1fr auto;gap:12px;background:rgba(255,255,255,.08);border-radius:11px;padding:11px 14px;font-size:.9rem}.topic-result span:last-child{color:var(--yellow);font-weight:800}
footer{text-align:center;color:var(--muted);font-size:.78rem;padding:0 20px 28px}
@media(max-width:800px){.topbar{height:auto;min-height:68px;gap:14px;flex-wrap:wrap;padding-top:12px;padding-bottom:12px}.progress-wrap{width:100%;order:3}.start-screen,.quiz-screen{grid-template-columns:1fr}.intro-card{border-radius:24px}.topic-stack{grid-template-columns:1fr 1fr}.case-panel{position:static}.app-shell{padding-top:24px}.quiz-screen{gap:14px}.case-panel,.question-panel{border-radius:20px}.case-visual{min-height:120px}}
@media(max-width:480px){.topic-stack{grid-template-columns:1fr}.topic-card:first-child{grid-column:auto}.topic-card{min-height:118px!important}.start-meta{gap:18px}.start-meta strong{font-size:1.35rem}.brand span:last-child{font-size:.92rem}.result-stats{gap:22px}.answer-btn{padding:14px 12px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}