:root{--bg: #0f1117;--theme-icon: "🌙";--surface: #181c27;--surface2: #1e2333;--border: rgba(255,255,255,.08);--border2: rgba(255,255,255,.14);--text: #e8eaf2;--muted: #7a7f99;--accent: #5c8fff;--accent-dim: rgba(92,143,255,.12);--green: #3ecf8e;--green-dim: rgba(62,207,142,.12);--red: #ff5c5c;--red-dim: rgba(255,92,92,.12);--yellow: #f7c948;--yellow-dim: rgba(247,201,72,.12);--radius: 10px;--radius-lg: 14px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif}[data-theme=light]{--bg: #f5f7fa;--surface: #ffffff;--surface2: #eef1f7;--border: rgba(0,0,0,.07);--border2: rgba(0,0,0,.14);--text: #111827;--muted: #6b7280;--accent: #2563eb;--accent-dim: rgba(37,99,235,.1);--green: #059669;--green-dim: rgba(5,150,105,.1);--red: #dc2626;--red-dim: rgba(220,38,38,.1);--yellow: #d97706;--yellow-dim: rgba(217,119,6,.1)}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);min-height:100vh}header{background:var(--surface);border-bottom:1px solid var(--border);padding:0 2rem;height:56px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}.logo{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:600}.logo svg{width:24px;height:24px}.header-right{display:flex;align-items:center;gap:12px}.badge-mode{font-size:11px;font-weight:600;letter-spacing:.05em;padding:4px 10px;border-radius:20px;text-transform:uppercase;background:var(--accent-dim);color:var(--accent);border:1px solid rgba(92,143,255,.25)}.page{display:none}.page.active{display:block}main{max-width:860px;margin:0 auto;padding:2.5rem 1.5rem 4rem}.home-hero{text-align:center;padding:3rem 0 2rem}.home-hero h1{font-size:2.8rem;font-weight:800;letter-spacing:-.04em;line-height:1;margin-bottom:.5rem}.hero-sub{font-size:13px;color:var(--muted);margin-bottom:.75rem}.hero-sub a{color:var(--accent);text-decoration:none;font-weight:600}.hero-sub a:hover{text-decoration:underline}.hero-cert{font-size:1rem;font-weight:500;color:var(--muted);margin-bottom:1rem}.home-hero p{color:var(--muted);font-size:15px;max-width:480px;margin:0 auto 2rem;line-height:1.6}.stats-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:12px;margin-bottom:2.5rem}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem;text-align:center}.stat-card .val{font-size:28px;font-weight:700;margin-bottom:4px}.stat-card .lbl{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px;margin-bottom:2rem}.cat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.25rem 1.25rem 1rem;cursor:pointer;transition:border-color .15s,background .15s;text-align:left}.cat-card:hover{border-color:var(--border2);background:var(--surface2)}.cat-card.selected{border-color:var(--accent);background:var(--accent-dim)}.cat-icon{font-size:22px;margin-bottom:.6rem}.cat-name{font-size:14px;font-weight:600;margin-bottom:4px}.cat-count{font-size:12px;color:var(--muted)}.cat-bar{margin-top:10px;height:3px;background:var(--border);border-radius:2px;overflow:hidden}.cat-bar-fill{height:100%;background:var(--accent);border-radius:2px;transition:width .4s}.cat-bar-fill.green{background:var(--green)}.cat-bar-fill.red{background:var(--red)}.start-row{display:flex;align-items:center;gap:12px;justify-content:center;flex-wrap:wrap}.btn-primary{background:var(--accent);color:#fff;border:none;padding:12px 28px;border-radius:var(--radius);font-size:15px;font-weight:600;cursor:pointer;transition:opacity .15s}.btn-primary:hover{opacity:.88}.btn-primary:disabled{opacity:.4;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--muted);border:1px solid var(--border);padding:11px 20px;border-radius:var(--radius);font-size:14px;cursor:pointer;transition:border-color .15s,color .15s}.btn-ghost:hover{border-color:var(--border2);color:var(--text)}.difficulty-row{display:flex;gap:8px;justify-content:center;margin-bottom:1.5rem}.diff-btn{padding:6px 16px;border-radius:20px;font-size:13px;font-weight:500;border:1px solid var(--border);cursor:pointer;background:transparent;color:var(--muted);transition:all .15s}.diff-btn.active{border-color:var(--accent);color:var(--accent);background:var(--accent-dim)}.select-hint{font-size:13px;color:var(--muted);text-align:center;margin-bottom:1rem}.quiz-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem}.quiz-meta{font-size:13px;color:var(--muted)}.quiz-cat-badge{font-size:11px;font-weight:600;padding:4px 10px;border-radius:20px;background:var(--accent-dim);color:var(--accent);border:1px solid rgba(92,143,255,.2)}.progress-wrap{margin-bottom:1.75rem}.progress-labels{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-bottom:6px}.progress-track{height:4px;background:var(--border);border-radius:2px;overflow:hidden}.progress-fill{height:100%;background:var(--accent);border-radius:2px;transition:width .35s ease}.q-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.75rem 2rem;margin-bottom:1.25rem}.q-text{font-size:17px;font-weight:500;line-height:1.65}.diff-indicator{display:inline-block;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;padding:3px 9px;border-radius:20px;margin-bottom:1rem}.diff-easy{background:var(--green-dim);color:var(--green)}.diff-medium{background:var(--yellow-dim);color:var(--yellow)}.diff-hard{background:var(--red-dim);color:var(--red)}.options{display:flex;flex-direction:column;gap:10px;margin-bottom:1.25rem}.opt-btn{display:flex;align-items:flex-start;gap:14px;padding:14px 16px;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface2);cursor:pointer;text-align:left;width:100%;color:var(--text);font-size:14px;line-height:1.55;transition:border-color .12s,background .12s}.opt-btn:hover:not([disabled]){border-color:var(--border2);background:var(--surface)}.opt-letter{flex-shrink:0;width:26px;height:26px;border-radius:6px;background:var(--border);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:var(--muted);margin-top:1px}.opt-btn.correct{border-color:var(--green);background:var(--green-dim)}.opt-btn.correct .opt-letter{background:var(--green);color:#0f1a13}.opt-btn.wrong{border-color:var(--red);background:var(--red-dim)}.opt-btn.wrong .opt-letter{background:var(--red);color:#1a0f0f}.explanation-box{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem 1.5rem;font-size:14px;line-height:1.7;color:var(--text);margin-bottom:1.25rem;display:none}.explanation-box.show{display:block}.explanation-box .exp-label{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;margin-bottom:.6rem}.exp-correct .exp-label{color:var(--green)}.exp-wrong .exp-label{color:var(--red)}.explanation-box.exp-correct{border-color:#3ecf8e40}.explanation-box.exp-wrong{border-color:#ff5c5c40}.quiz-footer{display:flex;justify-content:space-between;align-items:center}.quiz-score-live{font-size:13px;color:var(--muted)}.quiz-score-live span{color:var(--text);font-weight:600}.results-hero{text-align:center;padding:2rem 0 1.5rem}.score-circle{width:120px;height:120px;border-radius:50%;border:4px solid var(--accent);margin:0 auto 1.25rem;display:flex;flex-direction:column;align-items:center;justify-content:center}.score-circle.great{border-color:var(--green)}.score-circle.ok{border-color:var(--yellow)}.score-circle.low{border-color:var(--red)}.score-num{font-size:28px;font-weight:700;line-height:1}.score-denom{font-size:13px;color:var(--muted);margin-top:2px}.score-pct{font-size:22px;font-weight:700;margin-bottom:.4rem}.score-msg{color:var(--muted);font-size:15px;max-width:440px;margin:0 auto 2rem;line-height:1.6}.breakdown-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px;margin-bottom:2rem}.breakdown-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem}.breakdown-card .bc-cat{font-size:13px;font-weight:600;margin-bottom:.5rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.breakdown-card .bc-stat{font-size:22px;font-weight:700;margin-bottom:4px}.breakdown-card .bc-bar{height:3px;background:var(--border);border-radius:2px;overflow:hidden;margin-top:8px}.breakdown-card .bc-fill{height:100%;border-radius:2px}.wrong-list{margin-bottom:2rem}.wrong-list h3{font-size:14px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:1rem}.wrong-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem 1.25rem;margin-bottom:8px;display:flex;align-items:flex-start;gap:12px}.wi-icon{flex-shrink:0;width:20px;height:20px;border-radius:50%;background:var(--red-dim);border:1px solid var(--red);display:flex;align-items:center;justify-content:center;margin-top:2px}.wi-icon svg{width:10px;height:10px;stroke:var(--red);fill:none;stroke-width:2.5}.wi-text{font-size:14px;line-height:1.55}.wi-cat{font-size:11px;color:var(--muted);margin-top:3px}.results-footer{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.stats-section{margin-bottom:2.5rem}.stats-section h2{font-size:16px;font-weight:600;margin-bottom:1rem;padding-bottom:.6rem;border-bottom:1px solid var(--border)}.history-table{width:100%;border-collapse:collapse;font-size:14px}.history-table th{text-align:left;padding:8px 12px;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.06em;border-bottom:1px solid var(--border)}.history-table td{padding:10px 12px;border-bottom:1px solid var(--border)}.history-table tr:last-child td{border-bottom:none}.pct-badge{display:inline-block;padding:3px 9px;border-radius:20px;font-weight:600;font-size:12px}.pct-great{background:var(--green-dim);color:var(--green)}.pct-ok{background:var(--yellow-dim);color:var(--yellow)}.pct-low{background:var(--red-dim);color:var(--red)}.empty-state{text-align:center;padding:3rem 0;color:var(--muted);font-size:15px}.cert-selector{display:flex;gap:6px}.cert-pill{font-size:12px;font-weight:600;padding:5px 14px;border-radius:20px;border:1px solid var(--border2);background:transparent;color:var(--muted);cursor:pointer;transition:all .15s}.cert-pill:hover{border-color:var(--accent);color:var(--text)}.cert-pill.active{background:var(--accent-dim);border-color:var(--accent);color:var(--accent)}.theme-toggle{width:32px;height:32px;border-radius:8px;font-size:15px;border:1px solid var(--border2);background:transparent;color:var(--muted);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .12s,color .12s}.theme-toggle:hover{background:var(--surface2);color:var(--text)}nav{display:flex;gap:4px}.nav-btn{padding:6px 14px;border-radius:8px;font-size:13px;font-weight:500;border:none;cursor:pointer;background:transparent;color:var(--muted);transition:background .12s,color .12s}.nav-btn:hover,.nav-btn.active{background:var(--surface2);color:var(--text)}@media (max-width: 600px){main{padding:1.5rem 1rem 3rem}.q-card{padding:1.25rem}.home-hero h1{font-size:2rem}}.logo-text{display:flex;flex-direction:column;line-height:1.1}.logo-name{font-size:16px;font-weight:700;letter-spacing:-.01em}.logo-sub{font-size:10px;color:var(--muted);letter-spacing:.04em}footer{text-align:center;padding:2rem 0 3rem;font-size:12px;color:var(--muted);border-top:1px solid var(--border);margin-top:3rem}.donation-banner{text-align:center;margin:1.5rem 0;padding:1rem 1.5rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);font-size:14px;color:var(--muted)}.donation-banner a{color:var(--accent);text-decoration:none;font-weight:600}.donation-banner a:hover{text-decoration:underline}@media print{header,nav,footer,.btn-primary,.btn-ghost,.donation-banner,.cat-grid,.difficulty-row,.start-row,#page-home,#page-quiz,#page-stats,.results-footer{display:none!important}body{background:#fff!important;color:#111!important}.page{display:none!important}.page.active{display:block!important}.score-circle{border-color:#333!important}.score-num,.score-pct{color:#111!important}.score-msg{color:#444!important}.breakdown-card,.wrong-item{border:1px solid #ccc!important;background:#fff!important;break-inside:avoid}.print-header{display:block!important;font-size:20px;font-weight:700;margin-bottom:1rem;padding-bottom:.75rem;border-bottom:2px solid #111}.print-date{display:block!important;font-size:12px;color:#666;margin-bottom:1.5rem}}@media screen{.print-header,.print-date{display:none}}