:root{--bg-primary: #0d1117;--bg-secondary: #161b22;--bg-tertiary: #21262d;--border: #30363d;--border-active: #f78166;--text-primary: #e6edf3;--text-secondary: #8b949e;--accent: #f78166;--accent-blue: #58a6ff;--accent-green: #3fb950;--accent-yellow: #d29922;--canvas-bg-light: #fafaf8;--canvas-bg-dark: #1c1c1e;--font-ui: "Nunito", sans-serif;--font-brand: "Virgil", cursive;--font-mono: "Cascadia", monospace;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--shadow-sm: 0 1px 3px rgba(0,0,0,.3);--shadow-md: 0 4px 12px rgba(0,0,0,.4);--shadow-lg: 0 8px 32px rgba(0,0,0,.5);--transition: .2s ease}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-ui);background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}button{font-family:var(--font-ui);cursor:pointer;border:none;outline:none}input,textarea{font-family:var(--font-ui);outline:none}a{text-decoration:none;color:inherit}.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--radius-md);font-size:13px;font-weight:600;transition:all var(--transition);cursor:pointer}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:#e8735c;transform:translateY(-1px);box-shadow:0 4px 12px #f7816666}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background:var(--border)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover{color:var(--text-primary);background:var(--bg-tertiary)}