:root{--bg: #0d1117;--surface: #161b22;--border: #30363d;--text: #e6edf3;--muted: #8b949e;--primary: #2f81f7;--primary-hover: #1f6feb;--danger: #f85149;font-family:Inter,system-ui,-apple-system,sans-serif;color-scheme:dark}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;min-height:100vh;background:var(--bg);color:var(--text)}a{color:var(--primary);text-decoration:none}a:hover{color:var(--primary-hover)}.app{display:flex;flex-direction:column;min-height:100vh}.app-header{display:flex;align-items:center;justify-content:space-between;padding:1rem 2rem;background:var(--surface);border-bottom:1px solid var(--border)}.app-header .logo{font-weight:700;font-size:1.25rem;color:var(--text)}.app-header nav{display:flex;gap:1.5rem}main{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:2rem;width:100%;max-width:400px}.card h1{margin:0 0 1.5rem;font-size:1.5rem}.form-group{margin-bottom:1rem;display:flex;flex-direction:column}.form-group label{margin-bottom:.5rem;font-size:.875rem;color:var(--muted)}.form-group input{background:var(--bg);border:1px solid var(--border);color:var(--text);padding:.625rem;border-radius:6px;font-size:.875rem}.form-group input:focus{outline:none;border-color:var(--primary)}button{width:100%;padding:.625rem;background:var(--primary);color:#fff;border:none;border-radius:6px;font-weight:600;cursor:pointer;transition:background .15s}button:hover{background:var(--primary-hover)}button:disabled{opacity:.6;cursor:not-allowed}.error{color:var(--danger);font-size:.875rem;margin-top:.5rem}