:root{--background-color:#0d1117;--surface-color:#161b22;--surface-color-light:#21262d;--text-color:#e6edf3;--text-color-muted:#8b949e;--primary-color:#2f81f7;--primary-color-hover:#1f6feb;--border-color:#30363d;--danger-color:#f85149;--font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}body{margin:0;padding:0;background-color:var(--background-color);color:var(--text-color);font-family:var(--font-family);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}main{max-width:800px;margin:0 auto;padding:2rem 1rem}h1{font-size:2.5rem;font-weight:700;margin-bottom:2rem;background:linear-gradient(120deg,#58a6ff,#2f81f7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;text-align:center}.card{background-color:var(--surface-color);border:1px solid var(--border-color);border-radius:12px;padding:1.5rem;margin-bottom:1.5rem;box-shadow:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06)}.form-group{margin-bottom:1rem}.form-group label{display:block;font-size:.875rem;font-weight:500;margin-bottom:.5rem;color:var(--text-color-muted)}.form-control{width:100%;padding:.75rem 1rem;font-size:1rem;color:var(--text-color);background-color:var(--surface-color-light);border:1px solid var(--border-color);border-radius:6px;transition:border-color .15s ease-in-out,box-shadow .15s ease-in-out;box-sizing:border-box}.form-control:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px rgba(47,129,247,.3)}.btn{display:inline-block;font-weight:600;text-align:center;white-space:nowrap;vertical-align:middle;-webkit-user-select:none;-moz-user-select:none;user-select:none;border:1px solid transparent;padding:.75rem 1.5rem;font-size:1rem;line-height:1.5;border-radius:6px;transition:color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out;cursor:pointer}.btn-primary{color:#fff;background-color:var(--primary-color);border-color:var(--primary-color)}.btn-primary:hover{background-color:var(--primary-color-hover);border-color:var(--primary-color-hover)}.btn-primary:disabled{background-color:var(--surface-color-light);border-color:var(--border-color);color:var(--text-color-muted);cursor:not-allowed}.grid{display:grid;grid-gap:1rem;gap:1rem}.grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}@media (max-width:600px){.grid-cols-2{grid-template-columns:1fr}}.error-message{color:var(--danger-color)}.error-message,.success-message{margin-bottom:1rem;font-size:.875rem}.success-message{color:#3fb950}