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48px;font-size:12px;font-weight:600;text-transform:capitalize;color:var(--color-text-secondary);display:flex;align-items:center;gap:6px}.tree-difficulty:hover{background:#f1f5f9}.tree-difficulty-easy{color:#059669}.tree-difficulty-medium{color:#d97706}.tree-difficulty-hard{color:#dc2626}.tree-difficulty-undefined{color:var(--color-text-secondary)}.tree-question{padding:3px 16px 3px 64px;font-size:12px;font-family:SF Mono,Consolas,monospace;color:var(--color-text-secondary);display:flex;align-items:center;gap:6px;cursor:pointer;transition:background var(--transition)}.tree-question:hover{background:#f1f5f9}.tree-question.active{background:#e0e7ff;color:var(--color-primary);font-weight:600}.tree-chevron{font-size:10px;transition:transform .15s ease;color:var(--color-text-secondary);flex-shrink:0}.tree-chevron.expanded{transform:rotate(90deg)}.tree-count{margin-left:auto;font-size:11px;color:var(--color-text-secondary);font-weight:500;flex-shrink:0}.tree-status-correct{color:#059669;font-weight:700}.tree-status-incorrect{color:#dc2626;font-weight:700}.tree-status-flagged{color:#d97706;font-weight:700}.explore-placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--color-text-secondary);font-size:15px;gap:8px}.explore-card{max-width:800px;margin:24px auto}.explore-check-btn{display:inline-block;padding:10px 28px;background:#0039a6;color:#fff;border:none;border-radius:100px;font-size:14px;font-weight:600;font-family:inherit;cursor:pointer;transition:all var(--transition);margin-top:12px}.explore-check-btn:hover{background:#002d85}.explore-check-btn:disabled{opacity:.5;cursor:not-allowed}.explore-no-answer{margin-top:12px;font-size:13px;color:var(--color-text-secondary);font-style:italic}.explore-feedback{padding:4px 0}.explore-result{font-size:18px;font-weight:700;margin-bottom:12px}.explore-result.correct{color:#059669}.explore-result.incorrect{color:#dc2626}.explore-show-explanation-btn{margin-top:12px;padding:8px 20px;background:none;border:1px solid var(--color-border);border-radius:100px;font-size:13px;font-weight:600;font-family:inherit;cursor:pointer;color:var(--color-primary);transition:all var(--transition)}.explore-show-explanation-btn:hover{background:#e0e7ff}.explore-try-again-btn{margin-top:12px;padding:8px 20px;background:none;border:1px solid var(--color-border);border-radius:100px;font-size:13px;font-weight:600;font-family:inherit;cursor:pointer;color:var(--color-text-secondary);transition:all var(--transition)}.explore-try-again-btn:hover{background:#f1f5f9}.explore-tabs{display:flex;border-bottom:1px solid var(--color-border)}.explore-tab{padding:10px 20px;background:none;border:none;border-bottom:2px solid transparent;font-size:14px;font-weight:600;font-family:inherit;color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition)}.explore-tab:hover{color:var(--color-text)}.explore-tab.active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.explore-explanation-panel{padding:20px 24px}@media(max-width:768px){.landing-hero{padding:60px 20px 40px}.landing-hero-title{font-size:36px}.landing-features{grid-template-columns:1fr 1fr}.landing-feature-icon{width:56px;height:56px;font-size:18px}.landing-feature-card:nth-child(4) .landing-feature-icon{font-size:14px}.testimonial-grid{grid-template-columns:1fr}.landing-proof-stat{flex-direction:column;gap:4px}.proof-number{font-size:40px}.dashboard-stats{gap:12px 20px}.dashboard-charts{grid-template-columns:1fr}.app-nav-name{display:none}.history-row{flex-direction:row;gap:8px}}@media(max-width:480px){.landing-hero-title{font-size:32px}.landing-features{grid-template-columns:1fr}.landing-feature-icon{width:52px;height:52px;font-size:16px}.landing-feature-card:nth-child(4) .landing-feature-icon{font-size:13px}.landing-btn-row{flex-direction:column}.landing-cta-btn{width:100%;justify-content:center}.landing-guest-btn{width:100%}.guest-banner{flex-direction:column;gap:8px;text-align:center}.dashboard-stats{gap:8px 16px}.explore-layout{flex-direction:column;height:auto}.explore-sidebar{width:100%;max-height:40vh;border-right:none;border-bottom:1px solid var(--color-border)}.explore-sidebar-content{width:100%}.explore-buttons{flex-direction:column}.explore-btn{justify-content:center}}