:root{--primary: #2563eb;--bg: #f8fafc;--text: #1e293b;--card-bg: #ffffff;--toggle-bg: #e2e8f0}.dark{--primary: #3b82f6;--bg: #0f172a;--text: #f8fafc;--card-bg: #1e293b;--toggle-bg: #334155}body{margin:0;font-family:system-ui,sans-serif;background-color:var(--bg);color:var(--text);line-height:1.6;transition:background-color .3s,color .3s}.theme-toggle{position:fixed;top:1rem;right:1rem;background:var(--toggle-bg);color:var(--text);border:none;padding:.5rem 1rem;border-radius:20px;cursor:pointer;font-weight:600;z-index:1000;transition:background-color .3s}.header{background:var(--card-bg);padding:3rem 1rem 2rem;border-bottom:1px solid var(--toggle-bg);text-align:center}.header nav a{margin:0 10px;color:var(--primary);text-decoration:none;font-weight:600}.section{max-width:800px;margin:4rem auto;padding:0 1rem}.projects-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem}.project-card{background:var(--card-bg);padding:1.5rem;border-radius:8px;border:1px solid var(--toggle-bg);box-shadow:0 4px 6px -1px #0000000d}.tech-badge{font-size:.8rem;background:var(--toggle-bg);color:var(--primary);padding:.2rem .5rem;border-radius:4px}.btn{display:inline-block;background:var(--primary);color:#fff;padding:.5rem 1rem;margin:.5rem;text-decoration:none;border-radius:6px}footer{text-align:center;padding:2rem;border-top:1px solid var(--toggle-bg);margin-top:4rem}