:root{--primary-color: #667eea;--primary-hover: #5568d3;--success-color: #48bb78;--success-hover: #38a169;--danger-color: #f56565;--danger-hover: #e53e3e;--bg-color: #f7fafc;--card-bg: #ffffff;--text-primary: #2d3748;--text-secondary: #718096;--border-color: #e2e8f0;--error-bg: #fed7d7;--error-text: #c53030;--spacing-xs: .5rem;--spacing-sm: 1rem;--spacing-md: 1.5rem;--spacing-lg: 2rem;--spacing-xl: 3rem;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, .1), 0 1px 2px 0 rgba(0, 0, 0, .06);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05)}*{box-sizing:border-box;margin:0;padding:0}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;color:var(--text-primary)}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}.container{display:flex;justify-content:center;align-items:center;min-height:100vh;padding:var(--spacing-md)}.card{background:var(--card-bg);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:var(--spacing-xl);width:100%;max-width:450px;animation:slideUp .3s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.header{text-align:center;margin-bottom:var(--spacing-lg)}.header h1{font-size:1.875rem;font-weight:700;color:var(--text-primary);margin-bottom:var(--spacing-xs)}.header p{color:var(--text-secondary);font-size:.875rem}form{display:flex;flex-direction:column;gap:var(--spacing-md)}.form-group{display:flex;flex-direction:column;gap:var(--spacing-xs)}label{font-size:.875rem;font-weight:600;color:var(--text-primary)}input[type=text],input[type=password]{width:100%;padding:.75rem;font-size:1rem;border:2px solid var(--border-color);border-radius:var(--radius-md);transition:all .2s ease;outline:none}input[type=text]:focus,input[type=password]:focus{border-color:var(--primary-color);box-shadow:0 0 0 3px #667eea1a}input[type=text]:disabled,input[type=password]:disabled{background-color:var(--bg-color);cursor:not-allowed;opacity:.6}.btn{padding:.75rem 1.5rem;font-size:1rem;font-weight:600;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all .2s ease;text-align:center;outline:none}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-success{background:var(--success-color);color:#fff}.btn-success:hover:not(:disabled){background:var(--success-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-danger{background:var(--danger-color);color:#fff}.btn-danger:hover:not(:disabled){background:var(--danger-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.button-group{display:flex;flex-direction:column;gap:var(--spacing-sm);margin-top:var(--spacing-md)}.error-message{background:var(--error-bg);color:var(--error-text);padding:var(--spacing-sm);border-radius:var(--radius-md);font-size:.875rem;border-left:4px solid var(--error-text);margin-bottom:var(--spacing-md)}.loading{text-align:center;padding:var(--spacing-xl)}.spinner{border:4px solid rgba(255,255,255,.3);border-radius:50%;border-top:4px solid var(--primary-color);width:48px;height:48px;animation:spin 1s linear infinite;margin:0 auto var(--spacing-md)}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.oauth-info{background:var(--bg-color);padding:var(--spacing-lg);border-radius:var(--radius-md);margin:var(--spacing-md) 0}.app-name{font-size:1.5rem;font-weight:700;color:var(--text-primary);margin-bottom:var(--spacing-xs)}.oauth-description{color:var(--text-secondary);margin-bottom:var(--spacing-md)}.permissions{margin-top:var(--spacing-md)}.permissions h3{font-size:1rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--spacing-sm)}.permissions ul{list-style:none;padding:0}.permissions li{display:flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-xs) 0;color:var(--text-secondary);font-size:.875rem}.check-icon{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;background:var(--success-color);color:#fff;border-radius:50%;font-size:.75rem;font-weight:700;flex-shrink:0}.oauth-details{margin-top:var(--spacing-md);padding-top:var(--spacing-md);border-top:1px solid var(--border-color)}.oauth-details small{color:var(--text-secondary);font-size:.75rem;word-break:break-all}.footer{margin-top:var(--spacing-lg);padding-top:var(--spacing-md);border-top:1px solid var(--border-color);text-align:center}.footer p{color:var(--text-secondary);font-size:.75rem}@media(max-width:640px){.card{padding:var(--spacing-lg)}.header h1{font-size:1.5rem}.app-name{font-size:1.25rem}}*:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px}