:root{--blue: #0d47a1;--blue-dark: #08306b;--blue-light: #e8eef8;--gold: #ffc107;--green: #2e7d32;--green-light: #e6f4ea;--red: #c62828;--red-light: #fdecea;--gray: #607089;--ink: #1c2430;--muted: #6b7684;--bg: #f4f6fb;--card: #ffffff;--border: #dde3ec;--radius: 12px;--shadow: 0 2px 10px rgba(20, 40, 80, .06)}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%}body{font-family:Segoe UI,system-ui,-apple-system,Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.5}.screen{max-width:1040px;margin:0 auto;padding:24px 20px 60px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;margin-bottom:20px}h1{font-size:28px;margin:0 0 8px;color:var(--blue-dark)}h2{margin-top:0;color:var(--blue-dark)}.btn{font:inherit;font-weight:600;border:1px solid transparent;border-radius:8px;padding:10px 18px;cursor:pointer;transition:background .15s,box-shadow .15s,transform .05s}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn--lg{padding:14px 28px;font-size:17px}.btn--primary{background:var(--blue);color:#fff}.btn--primary:hover:not(:disabled){background:var(--blue-dark)}.btn--secondary{background:var(--gold);color:#4a3600}.btn--secondary:hover:not(:disabled){background:#ffb300}.btn--warn{background:#fff4d6;color:#7a5b00;border-color:#f0d488}.btn--warn:hover:not(:disabled){background:#ffe9ad}.btn--ghost{background:#fff;color:var(--blue);border-color:var(--border)}.btn--ghost:hover:not(:disabled){background:var(--blue-light)}.btn--link{background:transparent;color:var(--muted);padding:10px 8px}.btn--link:hover{color:var(--red)}.btn--danger{background:var(--red-light);color:var(--red);border-color:#f3c2bd}.start__header{text-align:center;margin-bottom:20px}.start__subtitle{color:var(--muted);margin:0}.start__list{margin:0 0 20px;padding-left:20px}.start__list li{margin-bottom:8px}.start__areas{display:grid;gap:10px;margin-bottom:20px}.start__area{border:1px solid var(--border);border-left:4px solid var(--blue);border-radius:8px;padding:12px 14px;background:#fbfcfe;font:inherit;text-align:left;width:100%;cursor:pointer;transition:background .15s,border-color .15s,opacity .15s}.start__area:hover:not(:disabled){background:#f2f6fd}.start__area.is-off{border-left-color:var(--border);background:#fafafa;opacity:.6}.start__area:disabled{cursor:default}.start__area-label{font-weight:700;color:var(--blue-dark);display:flex;align-items:center;gap:8px}.start__area.is-off .start__area-label{color:var(--muted)}.start__area-check{display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;flex:none;border:1px solid var(--border);border-radius:4px;background:#fff;font-size:12px;line-height:1}.start__area.is-on .start__area-check{background:var(--blue);border-color:var(--blue);color:#fff}.start__area-meta{font-size:14px;color:var(--muted)}.start__controls{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:20px}.field{display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:14px}.field input{font:inherit;padding:10px 12px;border:1px solid var(--border);border-radius:8px;width:140px}.field__hint{font-size:12px;font-weight:500;color:var(--muted);text-align:left;max-width:180px}button.field__hint--action{background:none;border:none;padding:0;color:var(--blue);text-decoration:underline;cursor:pointer}.field--slider{flex:1 1 320px;min-width:280px}.field--slider input[type=range]{width:100%;padding:0;accent-color:var(--blue);cursor:pointer}.slider__ticks{display:flex;justify-content:space-between;gap:4px;margin-top:4px}.slider__tick{font:inherit;font-size:12px;font-weight:600;color:var(--muted);background:none;border:none;padding:2px 4px;cursor:pointer;border-radius:4px}.slider__tick:hover{color:var(--blue)}.slider__tick.is-active{color:var(--blue-dark);background:var(--blue-light)}.start__total{text-align:right}.start__total-num{display:block;font-size:32px;font-weight:800;color:var(--blue);line-height:1}.start__total-label{font-size:13px;color:var(--muted)}.start__actions{display:flex;gap:12px;flex-wrap:wrap}.start__footer{text-align:center;font-size:13px;color:var(--muted);margin-top:10px}.exam__topbar{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:12px 16px;margin-bottom:18px;flex-wrap:wrap}.exam__progress{font-size:15px}.exam__answered{color:var(--muted);margin-left:4px}.exam__topbar-actions{display:flex;gap:8px}.exam__body{display:grid;grid-template-columns:1fr 260px;gap:18px;align-items:start}.timer{display:inline-flex;align-items:center;gap:8px;font-variant-numeric:tabular-nums;font-size:22px;font-weight:800;color:var(--blue-dark);background:var(--blue-light);padding:6px 14px;border-radius:8px}.timer--low{color:var(--red);background:var(--red-light)}.timer--paused{opacity:.7}.timer__badge{font-size:11px;letter-spacing:1px;background:var(--gold);color:#4a3600;padding:2px 6px;border-radius:4px}.question__meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}.tag{font-size:12px;font-weight:700;background:var(--blue);color:#fff;padding:3px 10px;border-radius:999px}.tag--muted{background:#eef1f6;color:var(--gray)}.question__text{font-size:20px;margin:0 0 18px}.choices{list-style:none;margin:0 0 18px;padding:0;display:grid;gap:10px}.choice{display:flex;align-items:center;gap:12px;width:100%;text-align:left;font:inherit;background:#fff;border:1.5px solid var(--border);border-radius:10px;padding:12px 14px;cursor:pointer;transition:border-color .12s,background .12s}.choice:hover{border-color:var(--blue);background:#f7faff}.choice--selected{border-color:var(--blue);background:var(--blue-light)}.choice--correct{border-color:var(--green);background:var(--green-light)}.choice--wrong{border-color:var(--red);background:var(--red-light)}.choice:disabled{cursor:default}.choice__letter{flex:0 0 28px;height:28px;display:grid;place-items:center;border-radius:50%;background:#eef1f6;font-weight:800;color:var(--blue-dark)}.choice--selected .choice__letter{background:var(--blue);color:#fff}.question__nav{display:flex;align-items:center;justify-content:space-between;gap:10px}.exam__paused{text-align:center;padding:48px 24px}.exam__side{position:sticky;top:82px}.palette{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px}.palette__legend{display:flex;flex-direction:column;gap:4px;font-size:12px;color:var(--muted);margin-bottom:12px}.dot{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:middle}.dot--answered{background:var(--blue)}.dot--unanswered{background:#fff;border:1px solid var(--border)}.dot--current{background:var(--gold)}.palette__grid{display:grid;grid-template-columns:repeat(6,1fr);gap:6px;max-height:60vh;overflow-y:auto}.palette__cell{font:inherit;font-size:13px;font-weight:600;aspect-ratio:1;border:1px solid var(--border);border-radius:6px;background:#fff;color:var(--ink);cursor:pointer}.palette__cell--answered{background:var(--blue);color:#fff;border-color:var(--blue)}.palette__cell--current{outline:3px solid var(--gold);outline-offset:-1px}.modal{position:fixed;top:0;right:0;bottom:0;left:0;background:#0c193280;display:grid;place-items:center;z-index:20;padding:20px}.modal__box{max-width:440px;margin:0}.modal__actions{display:flex;justify-content:flex-end;gap:10px;margin-top:18px}.verdict{text-align:center;border-radius:var(--radius);padding:32px 20px;margin-bottom:20px;color:#fff}.verdict--pass{background:linear-gradient(135deg,#2e7d32,#43a047)}.verdict--fail{background:linear-gradient(135deg,#c62828,#e53935)}.verdict__badge{font-size:14px;letter-spacing:3px;font-weight:700;opacity:.9}.verdict__score{font-size:56px;font-weight:800;line-height:1.1}.verdict__label{font-size:15px;opacity:.9}.verdict__raw{margin-top:6px;font-size:14px;opacity:.85}.results__rule{color:var(--muted);font-size:14px;margin-top:0}.results__areas{display:grid;gap:16px;margin-bottom:22px}.results__area-head{display:flex;justify-content:space-between;font-weight:700;margin-bottom:6px}.results__area-pct{color:var(--blue-dark)}.bar{height:12px;background:#eef1f6;border-radius:999px;overflow:hidden}.bar__fill{height:100%;background:var(--blue);transition:width .4s ease}.bar__fill--pass{background:var(--green)}.bar__fill--fail{background:var(--red)}.results__area-meta{font-size:13px;color:var(--muted);margin-top:4px}.results__flag{color:var(--red);font-weight:600}.results__actions{display:flex;gap:12px;flex-wrap:wrap}.review__head{margin-bottom:18px}.review__head-actions,.review__foot{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}.review__item{border-left:4px solid var(--red)}.review__num{margin-left:auto;font-size:13px;color:var(--muted)}.review__question{font-size:18px;margin:4px 0 14px}.review__choices{list-style:none;margin:0 0 14px;padding:0;display:grid;gap:8px}.review__choice{display:flex;align-items:center;gap:12px;padding:10px 14px;border:1.5px solid var(--border);border-radius:10px}.review__choice--correct{border-color:var(--green);background:var(--green-light)}.review__choice--wrong{border-color:var(--red);background:var(--red-light)}.review__tag{margin-left:auto;font-size:12px;font-weight:700;padding:2px 8px;border-radius:999px}.review__tag--correct{background:var(--green);color:#fff}.review__tag--wrong{background:var(--red);color:#fff}.review__unanswered{color:var(--red);font-size:14px;font-style:italic;margin:0 0 10px}.review__explain{background:#f7faff;border:1px solid var(--border);border-radius:8px;padding:12px 14px;font-size:14px}.flash__topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:12px 16px;margin-bottom:18px;flex-wrap:wrap}.flash__progress{font-size:15px}.flash__stats{display:flex;gap:16px;font-size:14px;color:var(--muted)}.flash__stats strong{color:var(--blue-dark);font-size:16px}.flash__card{margin-bottom:14px}.flash__hint{color:var(--muted);font-size:14px;font-style:italic;margin:4px 0 0}.flash__nav{display:flex;justify-content:flex-end;margin-top:6px}.flash__note{text-align:center;font-size:13px;color:var(--muted)}.history__head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;flex-wrap:wrap;gap:10px}.history__list{display:grid;gap:12px;margin-bottom:16px}.history__item{display:flex;align-items:center;gap:16px;margin-bottom:0}.history__verdict{font-weight:800;font-size:13px;letter-spacing:1px;padding:6px 12px;border-radius:8px}.history__verdict.is-pass{background:var(--green-light);color:var(--green)}.history__verdict.is-fail{background:var(--red-light);color:var(--red)}.history__score{font-size:22px;font-weight:800;color:var(--blue-dark)}.history__meta{font-size:13px;color:var(--muted)}.history__areas{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}.history__chip{font-size:12px;background:#eef1f6;color:var(--gray);padding:2px 8px;border-radius:999px}.flash__title{font-weight:800;color:var(--blue-dark);font-size:16px}.flash__sub{font-size:13px;color:var(--muted)}.bookmark{margin-left:auto;font:inherit;font-size:13px;font-weight:600;cursor:pointer;background:transparent;border:1px solid var(--border);color:var(--muted);padding:4px 10px;border-radius:999px}.bookmark:hover{border-color:var(--gold);color:var(--ink)}.bookmark.is-on{background:#fff8e1;border-color:var(--gold);color:#a06a00}.flash__grade{margin-top:6px}.flash__grade-hint{font-size:14px;color:var(--muted);margin:0 0 8px}.flash__grade-btns{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap}.start__banner{display:flex;align-items:center;gap:22px;flex-wrap:wrap;background:var(--blue-light);border:1px solid #d3def2;border-radius:var(--radius);padding:14px 18px;margin-bottom:18px}.start__banner-item{display:flex;flex-direction:column}.start__banner-num{font-size:22px;font-weight:800;color:var(--blue-dark)}.start__banner-label{font-size:12px;color:var(--gray)}.start__banner .btn{margin-left:auto}.mock-grid,.mode-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-top:10px}.mock-card,.mode-card{text-align:left;display:flex;flex-direction:column;gap:6px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;cursor:pointer;font:inherit;transition:border-color .15s,transform .05s}.mock-card:hover,.mode-card:hover:not(:disabled){border-color:var(--blue)}.mock-card:active,.mode-card:active:not(:disabled){transform:translateY(1px)}.mode-card:disabled{opacity:.55;cursor:not-allowed}.mock-card__label,.mode-card__label{font-weight:800;color:var(--blue-dark)}.mock-card__meta,.mode-card__count{font-size:13px;font-weight:700;color:var(--green)}.mock-card__blurb,.mode-card__desc{font-size:13px;color:var(--muted)}.drill__controls{display:flex;gap:16px;flex-wrap:wrap;margin:12px 0 4px}.field select{font:inherit;padding:10px 12px;border:1px solid var(--border);border-radius:8px;min-width:240px;background:var(--card);cursor:pointer}.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin-bottom:18px}.stat-tile{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 18px}.stat-tile__num{font-size:28px;font-weight:800;color:var(--blue-dark)}.stat-tile__label{font-size:13px;color:var(--muted);margin-top:2px}.topic-list{display:grid;gap:10px;margin-top:10px}.topic{text-align:left;font:inherit;cursor:pointer;background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:12px 14px}.topic:hover{border-color:var(--blue)}.topic__head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:6px}.topic__name{font-weight:700}.topic__pct{font-weight:800}.topic__pct--good{color:var(--green)}.topic__pct--mid{color:#b8860b}.topic__pct--low{color:var(--red)}.topic__meta{font-size:12px;color:var(--muted);margin-top:6px}.insights__strong{font-size:15px;margin:20px 0 0}.trend{display:flex;align-items:flex-end;gap:10px;height:120px;padding:8px 0}.trend__col{display:flex;flex-direction:column;align-items:center;gap:4px;flex:1;height:100%;justify-content:flex-end}.trend__bar-wrap{width:100%;height:100%;display:flex;align-items:flex-end;justify-content:center}.trend__bar{width:60%;max-width:34px;border-radius:6px 6px 0 0;background:var(--blue)}.trend__bar.is-pass{background:var(--green)}.trend__bar.is-fail{background:var(--gold)}.trend__val{font-size:12px;font-weight:700;color:var(--gray)}@media (max-width: 760px){.exam__body{grid-template-columns:1fr}.exam__side{position:static}.palette__grid{grid-template-columns:repeat(8,1fr);max-height:none}.verdict__score{font-size:44px}.bookmark{margin-left:0}}