:root{--bg-primary:#0f1115;--bg-secondary:#161a22;--bg-tertiary:#1f2430;--text-primary:#f0f2f5;--text-secondary:#8b949e;--border-color:#30363d;--accent-color:#2f81f7;--accent-hover:#58a6ff;--success-color:#238636;--success-hover:#2ea043;--warning-color:#d29922;--danger-color:#da3637;--shadow:0 4px 12px #0006;--font-family:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-primary);color:var(--text-primary);font-family:var(--font-family);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app-container{flex-direction:column;min-height:100vh;display:flex}.header{background-color:var(--bg-secondary);border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.header 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