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.75rem;font-size:.875rem;border:1px solid var(--color-border);border-radius:var(--radius);background:transparent;color:var(--color-text);cursor:pointer;min-height:2.25rem}.app-nav button:hover{background:var(--color-border)}.app-nav button.active{background:var(--color-accent);border-color:var(--color-accent);color:#fff}.app-main{flex:1;min-height:0;display:flex;flex-direction:column;padding:1rem}.app-main>*{flex:1;min-height:0;overflow:auto}@media (max-width: 480px){.app-title{font-size:.95rem}.app-nav button{padding:.35rem .5rem;font-size:.8rem}}:root{--color-bg: #0d1117;--color-surface: #161b22;--color-surface-elevated: #1c2128;--color-border: #30363d;--color-border-subtle: #21262d;--color-text: #e6edf3;--color-text-muted: #8b949e;--color-accent: #58a6ff;--color-success: #3fb950;--color-warning: #d29922;--font-sans: "Pretendard", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;--header-h: 3rem;--radius: 8px}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text);-webkit-font-smoothing:antialiased}@media (max-width: 768px){:root{--header-h: 3.5rem}}