*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #667eea;--primary-dark: #5a67d8;--secondary-color: #764ba2;--success-color: #28a745;--danger-color: #dc3545;--warning-color: #ffc107;--info-color: #17a2b8;--light-gray: #f8f9fa;--gray: #6c757d;--dark-gray: #343a40;--border-radius: 12px;--box-shadow: 0 10px 30px rgba(0, 0, 0, .1);--transition: all .3s ease}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:linear-gradient(135deg,var(--primary-color) 0%,var(--secondary-color) 100%);min-height:100vh;color:#333}.container{min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:20px}.login-card{background:#fff;border-radius:var(--border-radius);padding:50px;box-shadow:var(--box-shadow);max-width:450px;width:100%;margin-bottom:40px}.logo{text-align:center;margin-bottom:30px}.logo 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