:root{--bg:#f5f7fb;--surface:#fff;--text:#172033;--muted:#667085;--border:#e5e9f2;--primary:#4f46e5;--primary-dark:#3730a3;--primary-soft:#eef2ff;--accent:#0ea5e9;--success:#15803d;--success-bg:#ecfdf3;--success-border:#86efac;--danger:#b42318;--danger-bg:#fff1f2;--danger-border:#fda4af;--warning:#92400e;--warning-bg:#fffbeb;--warning-border:#fcd34d;--shadow-sm:0 3px 12px rgba(15,23,42,.06);--shadow-md:0 18px 45px rgba(15,23,42,.1);--radius:20px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:320px;min-height:100vh;color:var(--text);background:radial-gradient(circle at 12% 8%,rgba(79,70,229,.1),transparent 28rem),radial-gradient(circle at 92% 18%,rgba(14,165,233,.08),transparent 25rem),var(--bg);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.55}button,input{font:inherit}button{-webkit-tap-highlight-color:transparent}.skip-link{position:fixed;top:12px;left:12px;z-index:1000;transform:translateY(-150%);padding:10px 14px;border-radius:10px;color:#fff;background:var(--primary-dark)}.skip-link:focus{transform:translateY(0)}.app-shell{width:min(1160px,calc(100% - 28px));margin:0 auto;padding:28px 0 56px}.card{border:1px solid rgba(229,233,242,.9);border-radius:var(--radius);background:rgba(255,255,255,.96);box-shadow:var(--shadow-sm)}
.hero{position:relative;overflow:hidden;padding:clamp(28px,5vw,58px);background:linear-gradient(135deg,#312e81 0%,#4f46e5 52%,#0284c7 100%);color:#fff;box-shadow:var(--shadow-md)}.hero::after{content:"";position:absolute;width:280px;height:280px;right:-80px;top:-110px;border-radius:50%;background:rgba(255,255,255,.12)}.hero-kicker{display:inline-flex;align-items:center;gap:8px;margin:0 0 14px;padding:7px 11px;border:1px solid rgba(255,255,255,.25);border-radius:999px;background:rgba(255,255,255,.12);font-size:.82rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}.hero h1{max-width:760px;margin:0;font-size:clamp(2rem,5vw,4rem);line-height:1.04;letter-spacing:-.045em}.hero p{max-width:800px;margin:18px 0 0;color:rgba(255,255,255,.88);font-size:clamp(1rem,2vw,1.15rem)}.stats{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.stat-chip{padding:9px 12px;border-radius:12px;background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.18);font-size:.9rem;font-weight:600}
.home-panel{margin-top:22px;padding:clamp(20px,4vw,34px)}.panel-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:18px}.panel-heading h2{margin:0;font-size:clamp(1.3rem,2.5vw,1.8rem)}.panel-heading p{margin:6px 0 0;color:var(--muted)}.section-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.section-choice{position:relative}.section-choice input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}.section-choice label{display:flex;min-height:126px;flex-direction:column;justify-content:space-between;gap:14px;padding:18px;border:1px solid var(--border);border-radius:16px;background:var(--surface);cursor:pointer;transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease,background .2s ease}.section-choice label:hover{transform:translateY(-3px);border-color:#c7d2fe;box-shadow:0 12px 24px rgba(79,70,229,.1)}.section-choice input:focus-visible+label{outline:3px solid rgba(79,70,229,.25);outline-offset:3px}.section-choice input:checked+label{border-color:var(--primary);background:var(--primary-soft);box-shadow:0 0 0 3px rgba(79,70,229,.1)}.section-title{font-weight:750;line-height:1.35}.section-meta{display:flex;flex-wrap:wrap;gap:7px}.badge{display:inline-flex;align-items:center;padding:5px 8px;border-radius:999px;color:#475467;background:#f2f4f7;font-size:.74rem;font-weight:700}.badge.success{color:#166534;background:#dcfce7}.badge.warning{color:#92400e;background:#fef3c7}.home-actions{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:22px;padding-top:20px;border-top:1px solid var(--border)}.home-note{margin:0;max-width:650px;color:var(--muted);font-size:.92rem}
.primary-button,.secondary-button,.ghost-button{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:46px;padding:11px 18px;border-radius:13px;border:0;cursor:pointer;font-weight:750;transition:transform .18s ease,box-shadow .18s ease,background .18s ease,opacity .18s ease}.primary-button{color:#fff;background:linear-gradient(135deg,var(--primary),#6366f1);box-shadow:0 10px 22px rgba(79,70,229,.25)}.primary-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 14px 28px rgba(79,70,229,.32)}.primary-button:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}.secondary-button{color:var(--primary-dark);background:var(--primary-soft)}.secondary-button:hover{background:#e0e7ff;transform:translateY(-1px)}.ghost-button{color:#475467;background:transparent;border:1px solid var(--border)}.ghost-button:hover{background:#f8fafc}
.quiz-header{position:sticky;top:10px;z-index:30;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:16px;padding:14px 16px;backdrop-filter:blur(14px);background:rgba(255,255,255,.9);box-shadow:var(--shadow-sm)}.quiz-heading{min-width:0}.quiz-heading strong{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.quiz-heading span{color:var(--muted);font-size:.84rem}.progress-wrap{min-width:0}.progress-row{display:flex;justify-content:space-between;gap:12px;margin-bottom:7px;color:var(--muted);font-size:.78rem;font-weight:650}.progress-track{overflow:hidden;height:8px;border-radius:999px;background:#e9edf5}.progress-bar{height:100%;width:0;border-radius:inherit;background:linear-gradient(90deg,var(--primary),var(--accent));transition:width .35s ease}.icon-button{display:inline-grid;place-items:center;width:42px;height:42px;border:1px solid var(--border);border-radius:12px;background:#fff;color:#344054;cursor:pointer;font-size:1.35rem;transition:background .18s ease,transform .18s ease}.icon-button:hover{background:#f8fafc;transform:translateY(-1px)}
.quiz-card{margin-top:18px;padding:clamp(16px,3.2vw,30px);box-shadow:var(--shadow-md)}.question-topline{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px}.question-number{display:inline-flex;align-items:center;gap:8px;color:var(--primary-dark);font-weight:800}.question-number::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 5px var(--primary-soft)}.source-note{color:var(--muted);font-size:.82rem}.context-panel,.reference-panel{margin-bottom:16px;border:1px solid #dbeafe;border-radius:16px;background:#f8fbff}.context-panel summary,.reference-panel summary{padding:13px 16px;cursor:pointer;color:#1e3a8a;font-weight:750}.context-panel[open] summary,.reference-panel[open] summary{border-bottom:1px solid #dbeafe}.context-content{padding:14px}.source-group{display:grid;gap:12px}.source-card{overflow:hidden;border:1px solid #dfe5ef;border-radius:15px;background:#fff}.source-toolbar{display:flex;justify-content:flex-end;padding:7px 9px;border-bottom:1px solid #edf0f5;background:#fafbfc}.zoom-button{border:0;border-radius:9px;padding:6px 10px;color:#475467;background:transparent;cursor:pointer;font-size:.78rem;font-weight:700}.zoom-button:hover{color:var(--primary-dark);background:var(--primary-soft)}.source-fragment{position:relative;width:100%;overflow:hidden;background:#fff}.source-stage{position:absolute;top:0;left:0;transform-origin:top left;background-repeat:no-repeat;background-color:#fff}.source-span{position:absolute;white-space:pre;line-height:1;transform-origin:top left;user-select:text}
.answer-area{margin-top:22px}.answer-area h2{margin:0 0 6px;font-size:1.1rem}.answer-instruction{margin:0 0 14px;color:var(--muted);font-size:.9rem}.options-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}.option-button{min-height:64px;display:flex;align-items:center;justify-content:center;gap:9px;padding:10px;border:1px solid var(--border);border-radius:14px;background:#fff;color:#344054;cursor:pointer;font-weight:700;transition:transform .18s ease,border-color .18s ease,background .18s ease,box-shadow .18s ease}.option-button:hover:not(:disabled){transform:translateY(-2px);border-color:#a5b4fc;box-shadow:0 8px 18px rgba(79,70,229,.1)}.option-button:disabled{cursor:default}.option-letter{display:inline-grid;place-items:center;width:31px;height:31px;flex:0 0 auto;border-radius:9px;color:var(--primary-dark);background:var(--primary-soft);font-weight:850}.option-button.selected-neutral{border-color:#93c5fd;background:#eff6ff}.option-button.correct{border-color:var(--success-border);background:var(--success-bg);color:#166534}.option-button.correct .option-letter{color:#fff;background:var(--success)}.option-button.incorrect{border-color:var(--danger-border);background:var(--danger-bg);color:var(--danger)}.option-button.incorrect .option-letter{color:#fff;background:var(--danger)}.feedback{display:none;margin-top:14px;padding:13px 15px;border:1px solid;border-radius:13px;font-weight:650}.feedback.show{display:block}.feedback.success{color:var(--success);background:var(--success-bg);border-color:var(--success-border)}.feedback.error{color:var(--danger);background:var(--danger-bg);border-color:var(--danger-border)}.feedback.neutral{color:#1d4ed8;background:#eff6ff;border-color:#93c5fd}.question-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px;padding-top:18px;border-top:1px solid var(--border)}
.results-card{margin-top:22px;padding:clamp(22px,4vw,42px);box-shadow:var(--shadow-md)}.results-hero{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:24px}.score-ring{--score:0;position:relative;display:grid;place-items:center;width:150px;aspect-ratio:1;border-radius:50%;background:conic-gradient(var(--primary) calc(var(--score)*1%),#e9edf5 0)}.score-ring::before{content:"";position:absolute;inset:12px;border-radius:50%;background:#fff}.score-value{position:relative;text-align:center}.score-value strong{display:block;font-size:1.75rem;line-height:1}.score-value span{color:var(--muted);font-size:.8rem}.results-copy h1{margin:0;font-size:clamp(1.7rem,4vw,2.7rem);letter-spacing:-.035em}.results-copy p{margin:10px 0 0;color:var(--muted)}.results-metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:24px}.metric{padding:15px;border-radius:14px;background:#f8fafc;border:1px solid var(--border)}.metric strong{display:block;font-size:1.35rem}.metric span{color:var(--muted);font-size:.8rem}.review-section{margin-top:28px}.review-section h2{margin:0 0 8px}.review-section>p{margin:0 0 14px;color:var(--muted)}.review-list{display:grid;gap:9px}.review-item{display:grid;grid-template-columns:1fr auto auto auto;align-items:center;gap:12px;width:100%;padding:13px 14px;border:1px solid var(--border);border-radius:13px;background:#fff;color:inherit;text-align:left;cursor:pointer;transition:border-color .18s ease,transform .18s ease,box-shadow .18s ease}.review-item:hover{transform:translateY(-1px);border-color:#c7d2fe;box-shadow:var(--shadow-sm)}.review-item-title{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:700}.answer-pill{padding:5px 8px;border-radius:999px;font-size:.75rem;font-weight:800}.answer-pill.bad{color:var(--danger);background:var(--danger-bg)}.answer-pill.good{color:var(--success);background:var(--success-bg)}.review-arrow{color:var(--primary);font-weight:900}.results-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}.empty-review{padding:18px;border-radius:14px;background:var(--success-bg);color:var(--success);font-weight:700}.warning-banner{margin-top:16px;padding:12px 14px;border:1px solid var(--warning-border);border-radius:13px;color:var(--warning);background:var(--warning-bg);font-size:.9rem}
.source-modal{width:min(1120px,calc(100% - 24px));max-height:calc(100vh - 24px);padding:0;border:0;border-radius:18px;box-shadow:0 28px 90px rgba(15,23,42,.35)}.source-modal::backdrop{background:rgba(15,23,42,.68);backdrop-filter:blur(5px)}.modal-header{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:14px 16px;border-bottom:1px solid var(--border)}.modal-header h2{margin:0;font-size:1rem}.modal-content{overflow:auto;max-height:calc(100vh - 95px);padding:14px;background:#eef2f7}.modal-content .source-card{width:100%}.noscript{margin:20px;padding:16px;border-radius:12px;background:#fff1f2;color:#9f1239}:focus-visible{outline:3px solid rgba(79,70,229,.35);outline-offset:3px}
@media(max-width:900px){.section-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.results-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.options-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:680px){.app-shell{width:min(100% - 18px,1160px);padding-top:10px}.hero{border-radius:18px}.section-grid{grid-template-columns:1fr}.home-actions{align-items:stretch;flex-direction:column}.home-actions .primary-button{width:100%}.quiz-header{top:4px;grid-template-columns:auto 1fr}.progress-wrap{grid-column:1/-1;grid-row:2}.quiz-heading strong{font-size:.9rem}.quiz-card{padding:14px}.options-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.option-button:last-child:nth-child(odd){grid-column:1/-1}.results-hero{grid-template-columns:1fr;text-align:center}.score-ring{margin:auto}.results-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.review-item{grid-template-columns:1fr auto}.review-item .answer-pill{display:none}.question-actions{flex-direction:column-reverse}.question-actions button{width:100%}}
@media(max-width:430px){.options-grid{grid-template-columns:1fr}.option-button:last-child:nth-child(odd){grid-column:auto}.results-metrics{grid-template-columns:1fr 1fr}.stats{gap:6px}.stat-chip{font-size:.78rem}}
@media print{body{background:#fff}.quiz-header,.question-actions,.answer-area,.source-toolbar,.context-panel summary,.reference-panel summary{display:none!important}.app-shell{width:100%;padding:0}.quiz-card,.card{border:0;box-shadow:none}.context-panel,.reference-panel{border:0}.context-content{padding:0}.source-card{break-inside:avoid;border:0}}