.level3-back-link{color:var(--text-muted);margin-bottom:20px}.level3-concept-box{border-left:4px solid var(--btc-orange);background:#222;margin:20px 0;padding:15px}.level3-wallet-zone{border:1px solid #333;border-radius:12px;margin-top:40px;overflow:hidden}.level3-wallet-header{background:#1a1a1a;border-bottom:1px solid #333;padding:15px}.level3-wallet-header h3{color:#00d1b2;margin:0}.level3-wallet-content{padding:25px}.level3-keys-container{margin-bottom:20px}.level3-key-block{margin-bottom:15px}.level3-key-block:last-child{margin-bottom:0}.level3-key-label{margin-bottom:5px;font-size:.8rem;font-weight:700;display:block}.level3-private-key-label{color:#f44}.level3-public-key-label{color:#00d1b2}.level3-key-value{word-break:break-all;border-radius:6px;margin-top:5px;padding:10px;font-family:monospace;font-size:.8rem}.level3-private-key-value{background:#2a0000}.level3-public-key-value{background:#002a20}.level3-signing-section{margin-top:30px}.level3-message-input{color:#fff;background:#333;border:none;border-radius:6px;width:100%;margin-top:5px;padding:10px}.level3-sign-button{background:var(--btc-orange);color:#fff;cursor:pointer;border:none;border-radius:6px;margin-top:15px;padding:10px 20px;font-weight:700}.level3-sign-button:hover{opacity:.9}.level3-signature-display{margin-top:15px}.level3-signature-label{color:#aaa;margin-bottom:5px;font-size:.8rem;display:block}.level3-signature-value{color:#fff;background:#444;border-radius:6px;padding:10px;font-family:monospace;font-size:.9rem}.level3-signature-note{color:#888;margin-top:5px;font-size:.8rem}.level3-verifier-zone{border:1px solid #333;border-radius:12px;margin-top:40px;position:relative;overflow:hidden}.level3-verifier-header{background:#1a1a1a;border-bottom:1px solid #333;justify-content:space-between;padding:15px;display:flex}.level3-verifier-header h3{color:#aaa;margin:0}.level3-verifier-content{background:#0e0e0e;padding:25px}.level3-verifier-intro{color:#ccc;margin-bottom:20px;font-size:.9rem}.level3-verify-input-group{margin-bottom:15px}.level3-verify-label{color:#aaa;margin-bottom:5px;font-size:.8rem;display:block}.level3-verify-input{color:#fff;background:#222;border:1px solid #444;border-radius:6px;width:100%;padding:10px}.level3-verify-input-readonly{color:#fff;background:#111;border:1px solid #662a2a;font-family:monospace;font-size:.9rem}.level3-verify-button{color:#fff;cursor:pointer;background:#333;border:1px solid #555;border-radius:8px;width:100%;padding:15px;font-size:1.1rem;font-weight:700}.level3-verify-button:hover{background:#444}.level3-result{text-align:center;border-radius:8px;margin-top:20px;padding:20px}.level3-result-valid{background:#00d1b21a;border:2px solid #00d1b2}.level3-result-invalid{background:#ff44441a;border:2px solid #f44}.level3-result h2{margin:0}.level3-result-valid h2{color:#00d1b2}.level3-result-invalid h2{color:#f44}.level3-result p{color:#ccc;margin:10px 0 0}.level3-divider{border:0;border-top:1px solid #333;margin:40px 0}
:root{--text-color:#f0f0f0;--text-muted:#aaa;--bg-main:#0a0a0a;--bg-card:#1a1a1a;--bg-card-dark:#111;--bg-input:#333;--bg-hash:#000;--border-color:#444;--border-color-muted:#555;--color-bitcoin:#f7931a;--color-error:#f44;--color-success:#00d1b2;--bg-error-light:#ff44441a;--bg-box:#222}.blockchain-simulator{border:1px solid var(--border-color);background:var(--bg-card-dark);border-radius:12px;margin-top:20px;padding:20px}.simulator-header{border-bottom:1px solid var(--border-color-muted);margin-bottom:20px;padding-bottom:10px}.simulator-title{color:var(--color-bitcoin);margin:0}.simulator-description{color:var(--text-muted);margin-top:5px;font-size:.9rem}.block-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:8px;padding:15px;transition:all .3s}.block-card.invalid{border:2px solid var(--color-error);background:var(--bg-error-light)}.block-header{justify-content:space-between;margin-bottom:10px;display:flex}.block-id{color:var(--color-bitcoin);font-weight:700}.block-card.invalid .block-id{color:var(--color-error)}.block-data-label{margin-bottom:5px;font-size:.9rem;display:block}.block-data-input{background:var(--bg-input);border:1px solid var(--border-color-muted);width:100%;color:var(--text-color);border-radius:4px;padding:8px;font-size:.9rem}.block-hash-label{color:var(--text-muted);margin-bottom:3px;font-size:.75rem;display:block}.block-hash-value{color:var(--text-muted);background:var(--bg-hash);word-break:break-all;border-radius:4px;padding:5px;font-family:monospace;font-size:.75rem}.block-hash-value.link-broken{border:1px solid var(--color-error)}.block-hash-value.valid{color:var(--color-success);border:1px solid var(--color-success)}.block-hash-value.invalid-hash{color:var(--color-error);border:1px solid var(--color-error)}.error-message{color:var(--color-error);text-align:center;margin-top:10px;font-size:.9rem;font-weight:700}.chain-link-arrow{text-align:center;color:var(--border-color);z-index:1;margin:-5px 0;font-size:2rem;position:relative}.chain-link-arrow.broken{color:var(--color-error)}.simulator-info-box{background:var(--bg-box);color:var(--text-color);border-radius:8px;margin-top:20px;padding:15px;font-size:.9rem}
.mining-console{color:#e0e0e0;background:#000;border:2px solid #333;border-radius:12px;margin-top:20px;padding:20px;font-family:Courier New,Courier,monospace;box-shadow:0 0 15px #00000080}.mining-header{color:#0f0;border-bottom:1px solid #333;justify-content:space-between;align-items:center;margin-bottom:20px;padding-bottom:10px;display:flex}.difficulty-display{color:#f7931a;background:#222;border-radius:4px;padding:5px 10px;font-size:.9rem;font-weight:700}.block-data-grid{gap:15px;margin-bottom:20px;display:grid}.data-row{flex-direction:column;display:flex}.data-label{color:#888;text-transform:uppercase;margin-bottom:5px;font-size:.8rem}.data-value-static{color:#ccc;background:#111;border:1px solid #333;border-radius:4px;padding:10px}.nonce-input-container{align-items:center;gap:10px;display:flex}.nonce-input{color:#fff;background:#0a0a0a;border:1px solid #555;border-radius:4px;width:150px;padding:10px;font-family:inherit;font-size:1.1rem}.nonce-input.success{color:#0f0;border-color:#0f0}.nonce-buttons{gap:5px;display:flex}.nonce-btn{color:#fff;cursor:pointer;background:#222;border:1px solid #444;border-radius:4px;padding:5px 10px}.nonce-btn:hover{background:#333}.hash-result-box{text-align:center;border-radius:6px;margin-top:20px;padding:15px;transition:all .3s}.hash-result-box.mining{color:#888;background:#111;border:1px solid #333}.hash-result-box.mining .hash-value{color:#aaa}.hash-result-box.success{color:#0f0;background:#00ff001a;border:2px solid #0f0;animation:1s infinite alternate pulse-green;box-shadow:0 0 20px #0f03}.hash-result-box.success .hash-value{color:#0f0;font-weight:700}.hash-value{word-break:break-all;margin-top:5px;font-family:monospace;font-size:.9rem}@keyframes pulse-green{0%{box-shadow:0 0 10px #0f03}to{box-shadow:0 0 20px #00ff0080}}.mining-status{margin-top:10px;font-weight:700}
.chart-container{background:#1a1a1a;border:1px solid #333;border-radius:12px;margin-top:20px;padding:20px;position:relative;overflow:hidden}.chart-header{border-bottom:1px solid #333;justify-content:space-between;align-items:center;margin-bottom:20px;padding-bottom:10px;display:flex}.chart-title{color:#f7931a;margin:0;font-size:1.1rem}.chart-stats{grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:15px;margin-bottom:20px;display:grid}.stat-item{text-align:center;background:#111;border:1px solid #333;border-radius:6px;padding:10px}.stat-label{color:#888;text-transform:uppercase;margin-bottom:5px;font-size:.75rem;display:block}.stat-value{color:#fff;font-family:Courier New,monospace;font-size:1.1rem;font-weight:700}.stat-value.highlight{color:#f7931a}.supply-line{fill:none;stroke:#f7931a;stroke-width:3px;stroke-linecap:round;filter:drop-shadow(0 0 5px #f7931a80)}.grid-line{stroke:#333;stroke-width:1px;stroke-dasharray:4}.chart-axis-text{fill:#666;font-family:sans-serif;font-size:10px}.current-position-marker{fill:#fff;stroke:#f7931a;stroke-width:2px;transition:all .2s}.current-position-line{stroke:#fff;stroke-width:1px;stroke-dasharray:2;opacity:.5}.slider-container{background:#111;border-radius:8px;align-items:center;gap:15px;margin-top:20px;padding:10px;display:flex}.year-slider{-webkit-appearance:none;background:#333;border-radius:3px;outline:none;width:100%;height:6px}.year-slider::-webkit-slider-thumb{-webkit-appearance:none;cursor:pointer;background:#f7931a;border-radius:50%;width:20px;height:20px;transition:background .15s ease-in-out}.year-slider::-webkit-slider-thumb:hover{background:#ffb14e}
.lesson-content h2{color:var(--color-bitcoin);border-bottom:2px solid var(--color-bitcoin-muted);margin-top:30px;padding-bottom:5px}.wallet-comparison-grid{grid-template-columns:1fr 1fr;gap:20px;margin:20px 0;display:grid}.wallet-box{border-radius:10px;min-height:250px;padding:20px;transition:transform .2s;box-shadow:0 4px 6px #0000001a}.wallet-box:hover{transform:translateY(-2px)}.hot-wallet{background:#000;border:1px solid #f93}.cold-wallet{background:#001f3f;border:1px solid #00d1b2}.wallet-box h3{color:inherit;border-bottom:1px solid #fff3;align-items:center;gap:10px;margin-top:0;padding-bottom:5px;font-size:1.5rem;display:flex}.hot-wallet h3{color:#f93}.cold-wallet h3{color:#00d1b2}.wallet-box ul{margin-top:15px;padding-left:0;font-size:.95rem;list-style-type:none}.wallet-box ul li{color:#ccc;gap:8px;margin-bottom:8px;display:flex}.hot-wallet ul li:before{content:"⚡️"}.cold-wallet ul li:before{content:"🧊"}.seed-phrase-section{background:#111;border:1px solid #444;border-radius:12px;margin:30px 0;padding:25px}.seed-phrase-highlight{text-align:center;color:#00d1b2;word-spacing:15px;background:#000;border:2px dashed #f7931a;border-radius:8px;padding:15px;font-family:monospace;font-size:1.1rem}.security-tip-box{background:#333;border-left:5px solid #f44;border-radius:8px;margin-top:20px;padding:15px;font-size:.9rem}.security-tip-box strong{color:#f44}@media (max-width:768px){.wallet-comparison-grid{grid-template-columns:1fr}}
.trilemma-container{justify-content:center;margin:40px 0;display:flex}.trilemma-triangle{flex-direction:column;gap:15px;width:100%;max-width:400px;display:flex}.trilemma-point{text-align:center;color:#aaa;background:#111;border:1px solid #444;border-radius:12px;width:100%;padding:20px;font-size:1rem;font-weight:700;position:relative;inset:auto;transform:none;box-shadow:0 4px 10px #00000080}.point-security{color:#00d1b2;border-color:#00d1b2;border-left-style:solid;border-left-width:5px}.point-scalability{color:#f44;border-color:#f44;border-left-style:solid;border-left-width:5px}.point-decentralization{color:#f7931a;border-color:#f7931a;border-left-style:solid;border-left-width:5px}.trilemma-lines{display:none}.ln-simulator{background:#0f0f0f;border:1px solid #333;border-radius:12px;margin-top:30px;padding:20px}.ln-header{border-bottom:1px solid #333;justify-content:space-between;align-items:center;margin-bottom:20px;padding-bottom:10px;display:flex}.ln-channel-visual{justify-content:space-between;align-items:center;gap:15px;margin:30px 0;display:flex}.ln-user{text-align:center;width:80px}.ln-avatar{margin-bottom:5px;font-size:2rem}.ln-balance{color:#f7931a;font-family:monospace;font-weight:700}.ln-bar-container{background:#333;border-radius:10px;flex-grow:1;height:20px;display:flex;position:relative;overflow:hidden}.ln-bar-fill{height:100%;transition:width .3s ease-out}.fill-alice{background:#00d1b2}.fill-bob{background:#f44}.ln-bolt{color:#ff0;text-shadow:0 0 10px #ff0;z-index:2;font-size:1.5rem;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.ln-controls{justify-content:center;gap:20px;margin-bottom:20px;display:flex}.ln-btn{color:#fff;cursor:pointer;background:#222;border:1px solid #555;border-radius:6px;padding:8px 15px;font-size:.9rem;transition:all .2s}.ln-btn:hover:not(:disabled){background:#333;border-color:#aaa}.ln-btn:disabled{opacity:.5;cursor:not-allowed}.ln-status-log{color:#0f0;background:#000;border:1px solid #333;border-radius:6px;height:200px;padding:15px;font-family:monospace;font-size:.9rem;line-height:1.5;overflow-y:auto}@media (max-width:500px){.ln-channel-visual{flex-direction:column;gap:20px}.ln-bar-container{width:100%;height:30px}}