:root{--accent: var(--text);--accent-mid: var(--text-2);--accent-soft: rgba(255,255,255,.05);--radius: 14px;--radius-sm: 8px;--text-mid: var(--text-2);--text-mute: var(--text-3);--surface: var(--card);--known: #4ade80;--known-bg: rgba(74,222,128,.12);--unknown: #facc15;--unknown-bg: rgba(250,204,21,.12);--shadow: 0 4px 24px rgba(0,0,0,.5);--shadow-lg: 0 8px 32px rgba(0,0,0,.6)}.tool-breadcrumb{font-family:var(--mono);font-size:11px;color:var(--text-3);letter-spacing:.04em;padding:16px 24px 0}.tool-breadcrumb a{color:var(--text-3)}.tool-breadcrumb a:hover{color:var(--text-2)}main{max-width:900px;margin:0 auto;padding:24px 20px 80px}.screen{display:none}.screen.active{display:block}.start-header{text-align:center;margin-bottom:36px;padding:36px 32px 30px;position:relative;overflow:hidden;border:1px solid var(--border);border-radius:16px;background:var(--card)}.start-header:before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle,rgba(255,255,255,.05) 1px,transparent 1px);background-size:24px 24px;border-radius:16px;pointer-events:none}.start-header:after{content:"?";position:absolute;right:8%;top:12%;font-family:DM Mono,monospace;font-size:clamp(72px,10vw,140px);font-weight:700;color:#ffffff09;letter-spacing:-.04em;line-height:1;transform:rotate(-6deg);pointer-events:none}.start-header>*{position:relative;z-index:1}.fc-badge{display:inline-flex;align-items:center;gap:7px;background:#ffffff08;color:var(--text-2);border:1px solid var(--border-mid);font-family:DM Mono,monospace;font-size:11px;font-weight:700;letter-spacing:.15em;text-transform:uppercase;padding:4px 14px;border-radius:40px;margin-bottom:14px}.fc-badge svg{width:13px;height:13px}.fc-badge:before{content:"//";font-family:DM Mono,monospace;font-size:11px;font-weight:700;opacity:.55;letter-spacing:0}.tool-facts{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px;justify-content:center}.tool-fact{display:inline-flex;align-items:baseline;gap:5px;background:#ffffff08;border:1px solid var(--border);border-radius:8px;padding:6px 12px;font-size:12px}.tool-fact-label{color:var(--text-3)}.tool-fact-val{font-weight:700;color:var(--text);font-variant-numeric:tabular-nums}.tool-fact-unit{color:var(--text-3);font-size:11px}.start-header h1{font-size:clamp(26px,5vw,36px);font-weight:700;letter-spacing:-.5px;color:var(--text);margin-bottom:10px}.start-desc{color:var(--text-mid);font-size:15px;max-width:420px;margin:0 auto}.config-section{margin-bottom:28px}.config-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:2px;color:var(--text-mute);margin-bottom:10px}.cat-buttons{display:flex;gap:8px;flex-wrap:wrap}.cat-btn{display:inline-flex;align-items:center;gap:6px;padding:9px 16px;border-radius:40px;border:2px solid var(--border);background:var(--surface);font-size:14px;font-weight:500;color:var(--text-mid);cursor:pointer;transition:all .15s}.cat-btn svg{width:14px;height:14px;flex-shrink:0}.cat-count{font-size:11px;font-weight:600;font-family:DM Mono,monospace;opacity:.65}.cat-btn:hover{border-color:var(--border-hi);color:var(--text)}.cat-btn.active{background:#fff;border-color:#fff;color:#000}.cat-btn.active .cat-count{opacity:.65}.progress-bar-wrap{height:4px;background:var(--border);border-radius:4px;margin-bottom:10px;overflow:hidden}.progress-bar{height:100%;background:var(--text);border-radius:4px;transition:width .4s ease;width:0%}.progress-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.progress-text{font-size:13px;color:var(--text-mute);font-family:DM Mono,monospace}.known-count{font-size:12px;font-weight:600;color:var(--known);background:var(--known-bg);padding:3px 10px;border-radius:40px}.flashcard-container{cursor:pointer;margin-bottom:14px;outline:none}.flashcard-container:focus-visible .flashcard{box-shadow:0 0 0 3px #ffffff2e,var(--shadow)}.flashcard{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px 26px;transition:box-shadow .15s,transform .15s,border-color .15s;box-shadow:var(--shadow);min-height:200px}.flashcard-container:hover .flashcard{border-color:var(--border-hi);box-shadow:var(--shadow-lg);transform:translateY(-2px)}@keyframes fc-out{0%{opacity:1;transform:scaleX(1)}to{opacity:0;transform:scaleX(.88)}}@keyframes fc-in{0%{opacity:0;transform:scaleX(.88)}to{opacity:1;transform:scaleX(1)}}.flashcard.anim-out{animation:fc-out .13s ease forwards}.flashcard.anim-in{animation:fc-in .18s ease forwards}.card-front{display:flex;flex-direction:column;align-items:center;text-align:center;padding:12px 0 4px}.card-cat-pill{display:inline-flex;align-items:center;font-size:11px;font-weight:700;letter-spacing:2.5px;text-transform:uppercase;padding:4px 12px;border-radius:40px;margin-bottom:20px;font-family:DM Mono,monospace}.card-term{font-size:clamp(28px,6vw,42px);font-weight:700;letter-spacing:-.5px;color:var(--text);margin-bottom:14px;line-height:1.1}.card-oneliner{font-size:15px;color:var(--text-mid);line-height:1.5;max-width:380px}.card-recall-hint{margin-top:18px;font-size:13px;color:var(--text-mute);font-style:italic;letter-spacing:.1px}.card-cat-pill-back{margin-bottom:16px;font-size:11px}.card-oneliner-back{font-size:15px;font-weight:600;color:var(--text);line-height:1.5;margin-bottom:14px;padding-bottom:14px;border-bottom:1px solid var(--border)}.card-explanation{font-size:14px;color:var(--text-mid);line-height:1.65;margin-bottom:16px}.card-explanation p{margin-bottom:10px}.card-explanation p:last-child{margin-bottom:0}.card-example-wrap{background:#ffffff05;border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px}.card-example-label{font-size:10px;font-weight:700;letter-spacing:2px;text-transform:uppercase;color:var(--text-mute);margin-bottom:6px;font-family:DM Mono,monospace}.card-example{font-size:13px;color:var(--text-mid);line-height:1.55;font-style:italic}.flip-hint{display:flex;align-items:center;justify-content:center;gap:6px;font-size:12px;color:var(--text-mute);margin-bottom:20px}.card-actions{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px}.card-actions.hidden{display:none}.btn-action{display:flex;align-items:center;justify-content:center;gap:8px;padding:14px 20px;border-radius:40px;border:2px solid;font-size:15px;font-weight:600;cursor:pointer;transition:all .15s}.btn-unknown{background:var(--unknown-bg);border-color:#facc1566;color:var(--unknown)}.btn-unknown:hover{background:#facc152e;border-color:var(--unknown);transform:translateY(-1px)}.btn-known{background:var(--known-bg);border-color:#4ade8066;color:var(--known)}.btn-known:hover{background:#4ade802e;border-color:var(--known);transform:translateY(-1px)}.keyboard-hint{text-align:center;font-size:12px;color:var(--text-mute)}kbd{display:inline-block;background:#ffffff0f;border:1px solid var(--border-mid);border-radius:4px;padding:1px 5px;font-size:11px;font-family:DM Mono,monospace}.done-header{text-align:center;margin-bottom:20px;padding-top:8px}.done-emoji{font-size:52px;margin-bottom:10px}.done-header h2{font-size:clamp(22px,4vw,28px);font-weight:700;letter-spacing:-.3px}.done-score{margin-bottom:24px}.done-score-row{display:flex;gap:12px;justify-content:center}.score-chip{display:inline-flex;align-items:center;gap:7px;padding:10px 18px;border-radius:40px;font-size:15px;font-weight:600}.chip-known{background:var(--known-bg);color:var(--known)}.chip-unknown{background:var(--unknown-bg);color:var(--unknown)}.done-breakdown{margin-bottom:32px}.breakdown-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:2px;color:var(--text-mute);margin-bottom:10px}.breakdown-pills{display:flex;flex-wrap:wrap;gap:8px}.breakdown-pill{display:inline-block;padding:6px 14px;border-radius:40px;border:2px solid;font-size:13px;font-weight:600;text-decoration:none;background:var(--surface);transition:opacity .15s}.breakdown-pill:hover{opacity:.75}.done-actions{display:flex;flex-direction:column;gap:10px;align-items:stretch}.btn-primary{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;padding:15px 24px;background:#fff;color:#000;border:none;border-radius:40px;font-size:16px;font-weight:600;cursor:pointer;transition:background .15s,transform .1s;text-decoration:none;margin-bottom:16px}.btn-primary:hover{background:#e2e2e2}.btn-primary:active{transform:scale(.98)}.btn-primary.hidden{display:none}.btn-ghost-full{display:flex;align-items:center;justify-content:center;width:100%;padding:14px 24px;background:transparent;color:var(--text-mid);border:2px solid var(--border);border-radius:40px;font-size:15px;font-weight:500;cursor:pointer;text-decoration:none;transition:border-color .15s,color .15s;font-family:inherit}.btn-ghost-full:hover{border-color:var(--border-hi);color:var(--text)}.fc-info{border-top:1px solid var(--border);background:var(--surface-2, var(--card));padding:56px 20px 72px}.fc-info-inner{max-width:720px;margin:0 auto;display:flex;flex-direction:column;gap:40px}.info-block h2{font-size:22px;font-weight:700;letter-spacing:-.02em;color:var(--text);margin-bottom:14px}.info-block p{font-size:15px;line-height:1.65;color:var(--text-mid);margin-bottom:12px}.info-block p:last-child{margin-bottom:0}.info-block strong{color:var(--text);font-weight:600}.info-block a{color:var(--text);text-decoration:none;border-bottom:1px solid var(--border-hi);transition:border-color .12s}.info-block a:hover{border-bottom-color:var(--text)}.info-steps{list-style:none;counter-reset:step;padding:0;margin:0}.info-steps li{counter-increment:step;position:relative;padding-left:36px;margin-bottom:16px;font-size:15px;line-height:1.6;color:var(--text-mid)}.info-steps li:last-child{margin-bottom:0}.info-steps li:before{content:counter(step);position:absolute;left:0;top:-1px;width:24px;height:24px;border-radius:6px;background:#ffffff0a;color:var(--text);border:1px solid var(--border-mid);font-family:var(--mono, "DM Mono", monospace);font-size:12px;font-weight:600;display:inline-flex;align-items:center;justify-content:center}.faq-item{border:1px solid var(--border);border-radius:8px;background:var(--card);overflow:hidden;margin-bottom:6px}.faq-item summary{list-style:none;cursor:pointer;padding:14px 18px;font-size:14px;font-weight:600;color:var(--text);display:flex;align-items:center;justify-content:space-between;gap:12px}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary:after{content:"+";font-family:var(--mono, "DM Mono", monospace);font-size:16px;color:var(--text-mute);flex-shrink:0;transition:transform .15s}.faq-item[open] summary:after{content:"−"}.faq-item summary:hover{background:#ffffff08}.faq-answer{padding:0 18px 16px;font-size:14px;line-height:1.65;color:var(--text-mid)}.info-related-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}.info-related-list li{font-size:14px}.info-related-list a{font-weight:500}@media(max-width:480px){main{padding:20px 16px 60px}.tool-breadcrumb{padding:14px 16px 0}.start-header h1{font-size:24px}.done-emoji{font-size:42px}.card-term{font-size:28px}.btn-action{font-size:14px;padding:12px 16px}.done-score-row{flex-direction:column;align-items:center}.fc-info{padding:40px 16px 56px}.fc-info-inner{gap:32px}.info-block h2{font-size:20px}}.tool-cta-bar{margin-top:48px;border-top:1px solid var(--border);padding:28px 20px}.tool-cta-inner{max-width:780px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}.tool-cta-label{font-family:DM Mono,monospace;font-size:10px;font-weight:500;letter-spacing:.12em;text-transform:uppercase;color:var(--text-3);margin-bottom:6px}.tool-cta-text{font-size:13px;color:var(--text-mid);line-height:1.6;max-width:480px;margin:0}.tool-cta-actions{display:flex;align-items:center;gap:12px;flex-shrink:0}.tool-cta-btn{font-size:13px;font-weight:600;color:#000;background:#fff;border-radius:8px;padding:10px 20px;text-decoration:none;white-space:nowrap}.tool-cta-link{font-size:13px;color:var(--text-mid);text-decoration:none;white-space:nowrap}