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4px}*{margin:0;padding:0;box-sizing:border-box}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:14px;line-height:1.5;overflow:hidden;height:100vh;-webkit-font-smoothing:antialiased}#app{height:100vh;display:flex;flex-direction:column}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#d0d1d6;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#b0b1b6}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow-sm)}.panel-title{font-size:12px;font-weight:600;color:var(--text-secondary);margin-bottom:12px;letter-spacing:.02em}.btn{display:inline-flex;align-items:center;justify-content:center;gap:4px;padding:6px 16px;border:1px solid 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var(--border);flex-shrink:0;box-shadow:var(--shadow-sm)}.header-left{display:flex;align-items:center;gap:10px}.header-logo{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:var(--radius-sm);background:var(--brand);color:#fff;font-weight:700;font-size:13px;letter-spacing:-.5px}.header-title{font-size:15px;font-weight:600;color:var(--text);letter-spacing:-.01em}.header-right{display:flex;gap:8px;align-items:center}.main-layout{flex:1;display:flex;overflow:hidden;gap:12px;padding:12px;min-height:0}.cpu-section{flex:1;display:flex;flex-direction:column;gap:8px;min-width:0}.cpu-visual{flex:1;display:flex;gap:0;align-items:flex-start;padding-top:8px;min-height:0}.reg-column{display:flex;flex-direction:column;gap:10px;width:120px;flex-shrink:0;padding-top:10px}.reg-card{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);padding:12px;text-align:center;transition:all 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8px;border-radius:10px;font-weight:500}.ir-description{font-size:12px;color:var(--text-secondary);background:var(--purple-light);border-radius:var(--radius-sm);padding:6px 10px;line-height:1.4}.ram-column{flex:1;min-width:0;margin-left:8px}.phase-bar{display:flex;align-items:center;gap:8px;padding:6px 12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:12px;color:var(--text-secondary);flex-shrink:0}.phase-dot{width:8px;height:8px;border-radius:50%;background:var(--text-disabled)}.phase-dot.fetch{background:var(--brand)}.phase-dot.decode{background:var(--purple)}.phase-dot.execute{background:var(--blue)}.control-section{width:400px;flex-shrink:0;display:flex;flex-direction:column;gap:8px;overflow-y:auto}