:root{--bg:#f5f7f8;--surface:#fff;--ink:#173341;--muted:#667b85;--line:#dfe7eb;--accent:#087f70;--accent-soft:#e5f4f0;--green:#176c42;--green-bg:#ecf9f0;--red:#ac3434;--red-bg:#fff0f0;--radius:18px}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,"Segoe UI",Arial,sans-serif;font-size:16px;line-height:1.6}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button,a,input{touch-action:manipulation}
button{cursor:pointer}
button:disabled{opacity:.5;cursor:not-allowed}
:focus-visible{outline:3px solid #3d96cd;outline-offset:4px}
.site-header{height:92px;max-width:1240px;padding:0 36px;margin:auto;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:18px;line-height:1.3}
.brand small{display:block;color:var(--muted);font-size:12px;font-weight:400;margin-top:5px}
.brand-mark{width:42px;height:42px;display:grid;place-items:center;background:var(--ink);color:white;border-radius:13px;font-size:26px;font-weight:700}
.header-note{color:var(--muted);font-size:13px}
.container{max-width:1240px;margin:auto;padding:54px 36px 70px;min-height:calc(100vh - 165px)}
.site-footer{border-top:1px solid var(--line);text-align:center;color:var(--muted);padding:24px;font-size:12px}
.welcome-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:72px;align-items:center;padding:28px 0 60px}
.eyebrow,.step-label{font-size:11px;font-weight:750;letter-spacing:1.5px;color:var(--accent)}
h1,h2,h3,p{margin-top:0}
h1{font-size:36px;line-height:1.25;letter-spacing:-1px;margin:14px 0 18px;font-weight:700}
.intro h1{font-size:48px;line-height:1.22;letter-spacing:-1.8px}
h2{font-size:23px;line-height:1.35;margin-bottom:12px;letter-spacing:-.5px}
h3{font-size:16px;margin-bottom:4px}
.lead{font-size:17px;color:var(--muted);max-width:510px;line-height:1.85}
.muted{color:var(--muted)}
.facts{display:flex;gap:28px;margin:32px 0}
.facts>div{padding-right:25px;border-right:1px solid var(--line)}
.facts>div:last-child{padding:0;border:0}
.facts strong{display:block;font-size:25px;white-space:nowrap}
.facts span{display:block;font-size:12px;color:var(--muted);margin-top:3px}
.note{font-size:13px;color:var(--muted);border-left:3px solid #98c4b9;padding-left:14px;max-width:480px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.start-card{padding:34px;box-shadow:0 18px 45px #17334108}
.start-card h2{margin-top:14px}
.start-card .muted{font-size:14px}
.field-label{display:block;font-size:14px;font-weight:650;margin:25px 0 9px}
.text-input{width:100%;padding:14px 15px;border:1px solid #cbd8de;background:#fcfdfd;border-radius:10px;color:var(--ink)}
.text-input::placeholder{color:#91a0a6}
.field-help{font-size:12px;color:var(--muted);margin:12px 0 18px}
.button{display:inline-flex;align-items:center;justify-content:center;gap:16px;border:1px solid transparent;border-radius:10px;padding:13px 20px;min-height:48px;font-weight:650;font-size:14px;text-align:center}
.primary{color:white;background:var(--accent)}
.primary:hover{background:#05685d}
.secondary{border-color:var(--line);background:white}
.secondary:hover{background:#f5f7f8}
.full{width:100%}
.privacy-note{font-size:12px;color:var(--muted);margin:20px 0 0;line-height:1.6}
.topics-section{border-top:1px solid var(--line);padding-top:34px}
.section-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 0 22px}
.section-heading h2{margin:7px 0 0}
.pill{display:inline-block;padding:6px 13px;border:1px solid #cde2db;background:var(--accent-soft);border-radius:30px;color:#347263;font-size:12px;white-space:nowrap}
.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.topic-card{display:flex;align-items:flex-start;gap:14px;padding:20px;border:1px solid var(--line);border-radius:12px;background:white}
.topic-number{font-size:13px;color:var(--accent);background:var(--accent-soft);border-radius:8px;padding:5px 9px}
.topic-card h3{font-size:14px;line-height:1.5}
.topic-card p{font-size:11px;margin:7px 0 0}
.notice{padding:14px 17px;border:1px solid #c6dfd6;background:var(--accent-soft);border-radius:10px;margin-bottom:18px;font-size:14px}
.notice.danger{border-color:#edcaca;background:var(--red-bg);color:var(--red)}
.page-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:28px}
.page-heading h1{font-size:30px;margin:10px 0}
.page-heading p{margin:0;font-size:14px}
.exam-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:26px;align-items:start}
.question-list,.review-list{display:grid;gap:20px}
.question-card{padding:28px;scroll-margin-top:24px}
.question-meta{display:flex;align-items:center;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.question-number{font-size:13px;font-weight:750}
.topic-label{font-size:11px;color:var(--muted);background:#f1f5f6;border-radius:6px;padding:3px 8px}
.question-text{font-size:18px;line-height:1.65;font-weight:600;letter-spacing:0;overflow-wrap:anywhere;margin-bottom:12px}
.choice-hint{font-size:12px;color:var(--muted);margin-bottom:16px}
.options{display:grid;gap:10px;padding:0;margin:0;border:0;min-width:0}
.option{position:relative;display:flex;align-items:flex-start;gap:12px;padding:14px;border:1px solid var(--line);border-radius:10px;font-size:14px;transition:background .15s,border-color .15s;flex-wrap:wrap}
label.option{cursor:pointer}
label.option:hover{background:#f8fbfa;border-color:#a8cfc1}
.option:has(input:checked){background:var(--accent-soft);border-color:var(--accent)}
.option input{accent-color:var(--accent);margin:6px 0 0;width:16px;height:16px;flex-shrink:0}
.option-letter{display:inline-grid;place-items:center;border:1px solid #d3dde2;width:27px;height:27px;min-width:27px;border-radius:7px;font-size:12px;font-weight:700;background:#fff}
.option-text{flex:1;min-width:120px;overflow-wrap:anywhere}
.sticky-panel{position:sticky;top:24px;padding:25px}
.timer{font-size:44px;font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:1px;margin:8px 0 22px;line-height:1.3}
.timer-warning{color:var(--red)}
.progress-label{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--muted)}
.progress-label strong{color:var(--ink)}
progress{display:block;width:100%;height:7px;accent-color:var(--accent);border:0;border-radius:10px;overflow:hidden;margin:11px 0 22px;background:#edf1f2}
progress::-webkit-progress-bar{background:#edf1f2}
progress::-webkit-progress-value{background:var(--accent)}
.question-nav{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:7px;max-height:280px;overflow-y:auto;padding:4px}
.question-nav button{border:1px solid var(--line);border-radius:7px;background:#fff;min-height:35px;font-size:12px;color:var(--muted)}
.question-nav button.answered{background:var(--accent-soft);border-color:#9bcabb;color:var(--accent);font-weight:700}
.nav-legend{font-size:11px;color:var(--muted);display:flex;align-items:center;gap:7px;margin-top:14px}
.legend-dot{width:9px;height:9px;border-radius:3px;background:#add5c6}
.save-status{font-size:11px;color:var(--accent);margin:22px 0 16px}
.save-error{color:var(--red)}
.sticky-panel .field-help{margin-bottom:0;line-height:1.7}
.result-summary{display:flex;align-items:center;gap:36px;padding:30px 34px;margin-bottom:36px}
.score-block{min-width:180px;border-right:1px solid var(--line);padding-right:34px}
.score-block>span{font-size:11px;font-weight:700;letter-spacing:1px;color:var(--muted)}
.score-block strong{font-size:49px;line-height:1.5;color:var(--accent);letter-spacing:-1.5px}
.score-block div>span{font-size:15px;color:var(--muted);margin-left:8px}
.result-metrics{display:flex;flex:1;gap:34px}
.result-metrics strong{display:block;font-size:19px}
.result-metrics span{display:block;font-size:12px;color:var(--muted);margin-top:5px}
.result-actions{display:grid;gap:9px}
.review-legend{display:flex;gap:16px;font-size:12px}
.correct-text{color:var(--green)}
.wrong-text{color:var(--red)}
.result-tag{margin-left:auto;border-radius:20px;padding:3px 11px;font-size:11px;font-weight:650}
.result-tag.correct{background:var(--green-bg);color:var(--green)}
.result-tag.wrong{background:var(--red-bg);color:var(--red)}
.review-option.is-correct{background:var(--green-bg);border-color:#a0d7b4;color:var(--green)}
.review-option.is-wrong{background:var(--red-bg);border-color:#edb4b4;color:var(--red)}
.option-state{font-size:11px;font-weight:650;align-self:center;margin-left:auto}
.explanation{background:#f5f8fa;padding:17px 20px;border-radius:9px;margin-top:18px;font-size:13px}
.explanation p{margin:5px 0 0}
.error-card{max-width:680px;margin:40px auto;padding:38px}
.error-card h1{font-size:29px}
.error-card p{color:var(--muted)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:1024px){.welcome-grid{gap:35px}.intro h1{font-size:39px}.facts{gap:14px}.facts>div{padding-right:14px}.topic-grid{grid-template-columns:repeat(2,1fr)}.result-summary{flex-wrap:wrap}.result-actions{display:flex;width:100%}.exam-grid{grid-template-columns:minmax(0,1fr) 270px}}
@media(max-width:760px){.site-header{height:78px;padding:0 20px}.header-note{display:none}.container{padding:28px 18px 45px}.welcome-grid{grid-template-columns:1fr;gap:30px;padding:10px 0 36px}.intro h1{font-size:38px}.lead{font-size:16px}.start-card{padding:25px}.facts{gap:20px}.facts strong{font-size:22px}.topic-grid{grid-template-columns:1fr}.page-heading{align-items:flex-start}.page-heading h1{font-size:26px}.exam-grid{display:flex;flex-direction:column-reverse;gap:20px}.exam-sidebar,.question-list{width:100%}.sticky-panel{position:static;padding:20px}.timer{font-size:34px;margin:5px 0 12px}.question-nav{grid-template-columns:repeat(10,minmax(0,1fr));max-height:115px}.question-card{padding:20px}.question-text{font-size:17px}.result-summary{padding:24px;gap:22px}.score-block{min-width:145px;padding-right:20px}.score-block strong{font-size:40px}.result-metrics{flex-wrap:wrap;gap:18px}.result-actions{flex-wrap:wrap}.section-heading{align-items:flex-start}.review-legend{display:grid;gap:3px}.option-state{flex-basis:100%;margin-left:39px}.topic-card{padding:17px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{.site-header,.site-footer,.result-actions{display:none}.container{padding:0}.card{break-inside:avoid}.question-card{margin-bottom:15px}.result-summary{margin-bottom:20px}}