@font-face{font-family:Montserrat;src:url('fonts/Montserrat-Regular.ttf')}@font-face{font-family:Montserrat;src:url('fonts/Montserrat-Medium.ttf');font-weight:500}@font-face{font-family:Montserrat;src:url('fonts/Montserrat-SemiBold.ttf');font-weight:600}@font-face{font-family:Montserrat;src:url('fonts/Montserrat-Bold.ttf');font-weight:700}
:root{--bg:#f8f9fb;--surface:#fff;--surface-soft:#f4f7fc;--primary:#2858cb;--primary-hover:#1e47ac;--primary-soft:#edf3ff;--text:#19263b;--muted:#64748b;--border:#dee5ed;--success:#16865d;--success-soft:#eaf7f1;--danger:#c93c49;--danger-soft:#fff0f2;--warning:#8a5b14;--warning-soft:#fff8e8;--shadow:0 8px 24px rgba(25,38,59,.06);--radius:14px;--radius-sm:10px;color-scheme:light}
[data-theme=dark]{--bg:#101824;--surface:#182333;--surface-soft:#202f43;--primary:#a2bfff;--primary-hover:#c0d2ff;--primary-soft:#263b63;--text:#f4f7fc;--muted:#a5b2c5;--border:#344459;--success:#6bd0a7;--success-soft:#193f36;--danger:#ff9aa5;--danger-soft:#4b2730;--warning:#ffcf78;--warning-soft:#493817;--shadow:none;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:400 16px/1.55 Montserrat,Arial,sans-serif;-webkit-font-smoothing:antialiased}button{font:inherit}button:focus-visible,a:focus-visible{outline:3px solid var(--primary);outline-offset:3px}.hidden{display:none!important}.app-shell{min-height:100vh}.sidebar{display:none}.mobile-header{height:72px;padding:0 28px;display:flex;align-items:center;justify-content:space-between;background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}.brand{display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;font-weight:700;font-size:15px}.brand-mark{display:grid;place-items:center;width:40px;height:40px;flex:0 0 40px}.brand-mark img{width:100%;height:100%;object-fit:contain}.brand-mark .logo-dark{display:none}[data-theme=dark] .brand-mark .logo-light{display:none}[data-theme=dark] .brand-mark .logo-dark{display:block}.icon-button{display:grid;place-items:center;width:44px;height:44px;border:1px solid var(--border);border-radius:12px;background:var(--surface);color:var(--text);cursor:pointer;font-size:19px}.app-content{max-width:1120px;margin:0 auto;padding:30px 28px 104px}.page-heading{margin-bottom:24px}.eyebrow{margin:0 0 6px;color:var(--primary);font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.page-heading h1,.section-heading h2,.result h2{margin:0;font-size:27px;line-height:1.2;letter-spacing:-.025em}.page-heading>p:last-child,.section-heading>p:last-child{margin:8px 0 0;color:var(--muted);font-size:15px}.btn{min-height:48px;border:1px solid transparent;border-radius:12px;padding:12px 18px;font-size:16px;font-weight:600;cursor:pointer;transition:background .18s,border-color .18s,transform .18s}.btn:active{transform:scale(.98)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}[data-theme=dark] .btn-primary{color:#17233a}.btn-secondary{background:var(--surface);border-color:var(--border);color:var(--text)}.btn-secondary:hover{background:var(--surface-soft)}.welcome-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}.welcome-card h2{margin:0;font-size:22px;line-height:1.3}.welcome-card p{margin:8px 0 20px;color:var(--muted)}.welcome-card .btn{width:100%}.summary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:20px 0 30px}.stat{padding:14px 12px;border:1px solid var(--border);border-radius:12px;background:var(--surface)}.stat span{display:block;color:var(--muted);font-size:12px;line-height:1.25}.stat strong{display:block;margin-top:4px;font-size:22px;line-height:1.1}.section-heading{margin:0 0 14px}.topic-grid{display:grid;gap:12px}.topic-card{display:flex;align-items:center;gap:14px;padding:16px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);transition:border-color .18s,box-shadow .18s}.topic-card:hover{border-color:var(--primary);box-shadow:var(--shadow)}.topic-icon{display:grid;place-items:center;width:44px;height:44px;flex:0 0 44px;border-radius:12px;background:var(--primary-soft);color:var(--primary);font-size:17px;font-weight:700}.topic-card>div{min-width:0;flex:1}.topic-card h3{margin:0;font-size:16px}.topic-card p{margin:2px 0 0;color:var(--muted);font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topic-card button{width:44px;height:44px;border:0;border-radius:10px;background:transparent;color:var(--primary);font-size:22px;cursor:pointer}.study-tip{margin-top:30px;padding:20px;border-radius:var(--radius);background:var(--primary-soft);color:var(--text)}.study-tip p{margin:0;color:var(--muted);font-size:14px}.study-tip strong{display:block;margin-bottom:4px;font-size:16px}.bottom-nav{position:fixed;bottom:0;left:0;right:0;display:grid;grid-template-columns:repeat(3,1fr);padding:12px 28px max(12px,env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--border);z-index:15}.bottom-nav button{min-height:60px;border:0;background:transparent;color:var(--muted);font:600 14px/1.25 Montserrat,Arial,sans-serif;cursor:pointer}.bottom-nav button span{display:block;margin-bottom:3px;font-size:22px;line-height:24px}.bottom-nav .active{color:var(--primary)}.exam{max-width:760px;margin:0 auto;padding-bottom:84px}.exam-topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.back-button{display:flex;align-items:center;gap:6px;border:0;background:transparent;color:var(--muted);padding:8px 0;cursor:pointer;font-size:14px;font-weight:600}.timer{padding:7px 10px;border:1px solid var(--border);border-radius:9px;background:var(--surface);font-size:14px;font-weight:600;font-variant-numeric:tabular-nums}.exam-title-row{display:flex;justify-content:space-between;align-items:flex-end;gap:14px}.exam-title-row h2{margin:0;font-size:18px}.question-meta{display:flex;justify-content:space-between;gap:12px;margin:20px 0 10px;color:var(--muted);font-size:13px;font-weight:600}.progress-wrap{height:6px;border-radius:999px;background:var(--border);overflow:hidden}.progress{height:100%;width:5%;border-radius:inherit;background:var(--primary);transition:width .2s ease}.question-card{margin-top:26px}.question-card h3{margin:0 0 26px;font-size:21px;line-height:1.55;letter-spacing:-.012em}.answers{display:grid;gap:12px}.answer{display:flex;align-items:flex-start;gap:13px;width:100%;min-height:60px;padding:14px;background:var(--surface);border:1px solid var(--border);border-radius:12px;color:var(--text);cursor:pointer;text-align:left;transition:border-color .16s,background .16s,box-shadow .16s}.answer:hover:not(:disabled){border-color:var(--primary);background:var(--primary-soft)}.answer:disabled{cursor:default}.letter{display:grid;place-items:center;flex:0 0 28px;width:28px;height:28px;border:1px solid var(--border);border-radius:50%;color:var(--muted);font-size:12px;font-weight:700}.answer.selected{border:2px solid var(--primary);background:var(--primary-soft);padding:13px;box-shadow:0 0 0 2px color-mix(in srgb,var(--primary) 16%,transparent)}.answer.selected .letter{background:var(--primary);border-color:var(--primary);color:#fff}.answer.correct{border-color:var(--success);background:var(--success-soft)}.answer.wrong{border-color:var(--danger);background:var(--danger-soft)}.feedback{margin-top:18px;padding:16px;border-left:4px solid var(--warning);border-radius:0 10px 10px 0;background:var(--warning-soft);color:var(--text);font-size:14px}.question-actions{position:sticky;bottom:0;display:flex;gap:12px;margin:28px -28px 0;padding:16px 28px max(16px,env(safe-area-inset-bottom));background:var(--bg);border-top:1px solid var(--border)}.question-actions .btn{flex:1}.question-actions .btn-primary{flex:1.4}.question-actions .btn:disabled{opacity:.45;cursor:not-allowed}.result{max-width:760px;margin:20px auto;padding:28px 20px 80px;text-align:center}.result-score{display:flex;align-items:center;justify-content:center;gap:8px;margin:20px 0}.result-score strong{font-size:68px;line-height:1;color:var(--primary)}.result-score span{color:var(--muted);font-size:14px;text-align:left}.result>p:not(.eyebrow){margin:0 auto;color:var(--muted);max-width:520px}.result-breakdown{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:26px 0;text-align:left}.result-breakdown div{padding:14px;border:1px solid var(--border);border-radius:10px;background:var(--surface);font-size:13px}.result-breakdown strong{display:block;margin-top:2px;font-size:20px}.missed-review{margin:30px 0;text-align:left}.missed-review h3{margin:0;font-size:20px}.missed-review>p{color:var(--muted);font-size:14px}.missed-item{margin-top:12px;padding:16px;border:1px solid var(--border);border-radius:12px;background:var(--surface);font-size:14px}.missed-item strong{display:block;margin-bottom:8px}.correct-answer{margin:8px 0;color:var(--success);font-weight:600}.footer{display:none}@media(min-width:720px){.app-content{padding:42px 40px 60px}.welcome-card{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:30px}.welcome-card p{margin-bottom:0;max-width:570px}.welcome-card .btn{width:auto;min-width:200px}.summary-grid{max-width:560px}.topic-grid{grid-template-columns:1fr 1fr}.question-actions{margin-left:0;margin-right:0}.bottom-nav{display:none}}@media(min-width:1040px){.mobile-header{display:none}.app-shell{display:grid;grid-template-columns:250px minmax(0,1fr)}.sidebar{display:flex;position:sticky;top:0;height:100vh;flex-direction:column;padding:24px 16px;background:var(--surface);border-right:1px solid var(--border)}.sidebar .brand{padding:0 8px;font-size:16px}.sidebar-nav{display:grid;gap:6px;margin-top:42px}.sidebar-nav button{display:flex;align-items:center;gap:11px;width:100%;min-height:46px;padding:0 12px;border:0;border-radius:10px;background:transparent;color:var(--muted);font:500 14px Montserrat,Arial,sans-serif;text-align:left;cursor:pointer}.sidebar-nav button:hover,.sidebar-nav .active{background:var(--primary-soft);color:var(--primary);font-weight:600}.sidebar-bottom{margin-top:auto;padding:12px 8px;color:var(--muted);font-size:12px}.app-shell.in-session{display:block}.app-shell.in-session .sidebar,.app-shell.in-session .mobile-header{display:none}.app-shell.in-session .app-content{max-width:900px;padding-top:32px}.app-shell.in-session .bottom-nav{display:none}}.app-shell.in-session .mobile-header,.app-shell.in-session .bottom-nav{display:none}@media(max-width:719px){.mobile-header{height:96px;padding:24px 28px 0}.topic-grid{gap:16px}.topic-card{gap:16px;min-height:108px;padding:20px 18px}.topic-icon{width:52px;height:52px;flex-basis:52px;font-size:20px}.topic-card h3{font-size:18px}.topic-card p{font-size:15px;line-height:1.4;white-space:normal}.topic-card button{width:48px;height:48px;font-size:26px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}