*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #2d3436;--primary-light: #636e72;--accent: #4a90d9;--accent-dark: #357abd;--success: #00b894;--warning: #fdcb6e;--danger: #d63031;--bg: #f5f6fa;--bg-card: #ffffff;--border: #dfe6e9;--text: #2d3436;--text-muted: #636e72;--shadow: 0 2px 10px rgba(0, 0, 0, .08);--shadow-lg: 0 4px 20px rgba(0, 0, 0, .12);--radius: 8px;--radius-sm: 4px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;min-height:100vh}.app{display:flex;flex-direction:column;min-height:100vh}.app-header{background:linear-gradient(135deg,var(--primary),#1a1a2e);color:#fff;padding:16px 24px;text-align:center}.app-header 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