:root{--bg-base: #0d0f1a;--bg-surface: #161827;--bg-card: #1e2035;--bg-raised: #252840;--accent: #00d4c8;--accent-dim: #00a89e;--purple: #7c4dff;--purple-dim: #5e35b1;--txt-main: #e8eaf6;--txt-muted: #8890b5;--success: #00e676;--error: #ff5252;--warn: #ffab40;--border: #2a2d45;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--shadow: 0 4px 20px rgba(0, 0, 0, .4)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{background:var(--bg-base);color:var(--txt-main);font-family:Pretendard,Noto Sans KR,system-ui,sans-serif;line-height:1.6;min-height:100dvh}button{cursor:pointer;border:none;background:none;font:inherit;color:inherit}input,textarea{font:inherit;color:inherit}a{color:inherit;text-decoration:none}.app{display:flex;flex-direction:column;min-height:100dvh}.main-content{flex:1;width:100%;max-width:1200px;margin:0 auto;padding:24px 16px 48px}.header{display:flex;align-items:center;justify-content:space-between;padding:0 24px;height:60px;background:var(--bg-surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}.header-logo{display:flex;align-items:center;gap:8px;font-size:1.2rem;font-weight:700;color:var(--accent);letter-spacing:-.5px}.header-logo span{color:var(--txt-main)}.nav-tabs{display:flex;gap:4px;background:var(--bg-card);padding:4px;border-radius:var(--radius-md)}.nav-tab{padding:6px 16px;border-radius:var(--radius-sm);font-size:.85rem;font-weight:500;color:var(--txt-muted);transition:background .2s,color .2s}.nav-tab:hover{color:var(--txt-main)}.nav-tab.active{background:var(--accent);color:#000;font-weight:700}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:20px}.section-label{font-size:.72rem;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--accent);margin-bottom:12px}.badge{display:inline-flex;align-items:center;padding:2px 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var(--border);color:var(--txt-muted)}.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}.switch-wrap{display:flex;flex-direction:column;align-items:center;gap:8px}.switch-label{font-size:.78rem;color:var(--txt-muted);text-align:center;max-width:80px;line-height:1.3}.switch{width:52px;height:28px;border-radius:14px;border:2px solid var(--border);background:var(--bg-raised);position:relative;cursor:pointer;transition:background .25s,border-color .25s}.switch.on{background:var(--accent);border-color:var(--accent)}.switch:after{content:"";position:absolute;top:2px;left:2px;width:20px;height:20px;border-radius:50%;background:var(--txt-muted);transition:transform .25s,background .25s}.switch.on:after{transform:translate(24px);background:#000}.switch-val{font-size:1.1rem;font-weight:700;color:var(--txt-muted)}.switch-val.on{color:var(--accent)}.gate-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.gate-btn{padding:10px 0;border-radius:var(--radius-sm);background:var(--bg-raised);border:1.5px solid var(--border);color:var(--txt-muted);font-size:.82rem;font-weight:700;letter-spacing:.5px;transition:background .2s,border-color .2s,color .2s}.gate-btn:hover{border-color:var(--accent);color:var(--accent)}.gate-btn.active{background:#00d4c81f;border-color:var(--accent);color:var(--accent)}.led-wrap{display:flex;flex-direction:column;align-items:center;gap:6px}.led{width:40px;height:40px;border-radius:50%;background:var(--bg-raised);border:2px solid var(--border);transition:background .3s,box-shadow .3s}.led.on{background:var(--accent);box-shadow:0 0 16px var(--accent);border-color:var(--accent)}.led-label{font-size:.78rem;color:var(--txt-muted);text-align:center}.circuit-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.gate-box{padding:8px 16px;background:var(--purple);border-radius:var(--radius-sm);font-weight:700;font-size:.9rem;min-width:72px;text-align:center}.wire{flex:1;height:2px;background:var(--border);min-width:20px}.wire.active{background:var(--accent)}.truth-table{width:100%;border-collapse:collapse;font-size:.85rem}.truth-table th{padding:6px 12px;background:var(--bg-raised);color:var(--accent);font-weight:600;text-align:center;border-bottom:1px solid var(--border)}.truth-table td{padding:6px 12px;text-align:center;border-bottom:1px solid var(--border);color:var(--txt-muted);transition:background .2s}.truth-table tr.highlight td{background:#00d4c81f;color:var(--txt-main);font-weight:600}.truth-table td.out-1{color:var(--success)}.truth-table td.out-0{color:var(--error)}.verdict-row{display:flex;justify-content:space-between;align-items:center;padding:8px 0;border-bottom:1px solid 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var(--border);border-radius:var(--radius-md);padding:16px;margin-bottom:12px}.note-card.reviewed{border-color:#00e6764d}.note-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.note-title{font-size:.88rem;font-weight:600}.note-date{font-size:.72rem;color:var(--txt-muted)}.note-answer{font-size:.82rem;color:var(--txt-muted);margin-bottom:8px}.note-answer strong{color:var(--error);margin-right:4px}.note-answer span{color:var(--success)}.note-textarea{width:100%;background:var(--bg-raised);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;font-size:.82rem;resize:vertical;min-height:60px;color:var(--txt-main);outline:none;transition:border-color .2s}.note-textarea:focus{border-color:var(--accent)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;z-index:200;display:flex;align-items:center;justify-content:center;padding:16px}.modal-box{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;width:100%;max-width:420px;box-shadow:var(--shadow)}.modal-title{font-size:1rem;font-weight:700;margin-bottom:20px;color:var(--accent)}.modal-field{margin-bottom:14px}.modal-field label{display:block;font-size:.78rem;color:var(--txt-muted);margin-bottom:4px}.modal-field input{width:100%;background:var(--bg-raised);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;font-size:.88rem;outline:none;transition:border-color .2s}.modal-field input:focus{border-color:var(--accent)}.modal-footer{display:flex;justify-content:flex-end;gap:8px;margin-top:20px}.hint-box{background:#ffab4014;border:1px solid rgba(255,171,64,.3);border-radius:var(--radius-sm);padding:10px 14px;font-size:.82rem;color:var(--warn);line-height:1.5}.hint-box:before{content:"💡 힌트: ";font-weight:600}.focus-badge{display:inline-flex;align-items:center;gap:4px;background:#ff52521f;border:1px solid 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