* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Inter', sans-serif;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            background-attachment: fixed;
            padding: 20px;
            animation: gradientBG 15s ease infinite;
            background-size: 400% 400%;
        }
        
        @keyframes gradientBG {
            0% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }
        
        .bg-particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 0;
            overflow: hidden;
        }
        
        .particle {
            position: absolute;
            background: rgba(255, 255, 255, 0.15);
            border-radius: 50%;
            animation: floatParticle linear infinite;
        }
        
        @keyframes floatParticle {
            0% {
                transform: translateY(100vh) scale(0);
                opacity: 0;
            }
            10% { opacity: 1; }
            90% { opacity: 1; }
            100% {
                transform: translateY(-10vh) scale(1);
                opacity: 0;
            }
        }
        
        .login-container {
            position: relative;
            z-index: 1;
            width: 100%;
            max-width: 420px;
            animation: slideUp 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
        }
        
        @keyframes slideUp {
            0% {
                opacity: 0;
                transform: translateY(60px) scale(0.95);
            }
            100% {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }
        
        .login-box {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-radius: 24px;
            padding: 40px 32px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.3);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        
        .login-box:hover {
            transform: translateY(-2px);
            box-shadow: 0 24px 72px rgba(0, 0, 0, 0.18);
        }
        
        .logo-container {
            text-align: center;
            margin-bottom: 32px;
        }
        
        .logo-container img {
            max-height: 60px;
            width: auto;
            transition: transform 0.3s ease;
        }
        
        .logo-container img:hover {
            transform: scale(1.05);
        }
        
        .logo-container h1 {
            font-size: 24px;
            font-weight: 700;
            color: #2c3e50;
            margin-top: 12px;
            letter-spacing: -0.5px;
        }
        
        .logo-container p {
            color: #7f8c8d;
            font-size: 14px;
            margin-top: 4px;
            font-weight: 400;
        }
        
        .alert {
            padding: 14px 18px;
            border-radius: 12px;
            margin-bottom: 20px;
            font-size: 14px;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 10px;
            animation: shakeAlert 0.5s ease-in-out;
        }
        
        @keyframes shakeAlert {
            0%, 100% { transform: translateX(0); }
            10%, 30%, 50%, 70%, 90% { transform: translateX(-4px); }
            20%, 40%, 60%, 80% { transform: translateX(4px); }
        }
        
        .error {
            background: #fee2e2;
            color: #dc2626;
            border: 1px solid #fca5a5;
        }
        
        .success {
            background: #dcfce7;
            color: #16a34a;
            border: 1px solid #86efac;
        }
        
        .alert i {
            font-size: 18px;
            flex-shrink: 0;
        }
        
        .form-group {
            margin-bottom: 22px;
            position: relative;
        }
        
        .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            color: #374151;
            margin-bottom: 6px;
            transition: all 0.3s ease;
        }
        
        .input-wrapper {
            position: relative;
        }
        
        .input-wrapper i {
            position: absolute;
            left: 16px;
            top: 50%;
            transform: translateY(-50%);
            color: #9ca3af;
            font-size: 18px;
            transition: all 0.3s ease;
            pointer-events: none;
        }
        
        .input-wrapper input {
            width: 100%;
            padding: 14px 16px 14px 48px;
            border: 2px solid #e5e7eb;
            border-radius: 12px;
            font-size: 15px;
            font-family: inherit;
            background: #f9fafb;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            color: #1f2937;
            outline: none;
        }
        
        .input-wrapper input::placeholder {
            color: #9ca3af;
            font-weight: 400;
        }
        
        .input-wrapper input:focus {
            border-color: #667eea;
            background: #ffffff;
            box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
            transform: translateY(-1px);
        }
        
        .input-wrapper input:focus + i {
            color: #667eea;
        }
        
        .toggle-password {
            position: absolute;
            right: 16px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: #9ca3af;
            cursor: pointer;
            padding: 4px;
            font-size: 18px;
            transition: all 0.3s ease;
            z-index: 2;
        }
        
        .toggle-password:hover {
            color: #667eea;
        }
        
        .btn-login {
            width: 100%;
            padding: 16px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            font-family: inherit;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
            margin-top: 4px;
        }
        
        .btn-login::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.6s ease;
        }
        
        .btn-login:hover::before {
            left: 100%;
        }
        
        .btn-login:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(102, 126, 234, 0.4);
        }
        
        .btn-login:active {
            transform: translateY(0);
            box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
        }
        
        .btn-login .btn-content {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            position: relative;
            z-index: 1;
        }
        
        .btn-login .btn-content i {
            font-size: 18px;
            transition: transform 0.3s ease;
        }
        
        .btn-login:hover .btn-content i {
            transform: translateX(4px);
        }
        
        .btn-login.loading {
            pointer-events: none;
            opacity: 0.8;
        }
        
        .btn-login.loading .btn-content .spinner {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255, 255, 255, 0.3);
            border-top-color: #fff;
            border-radius: 50%;
            animation: spin 0.8s linear infinite;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        .btn-login.loading .btn-content i,
        .btn-login.loading .btn-content span {
            display: none;
        }
        
        .btn-login .btn-content .spinner {
            display: none;
        }
        
        .footer {
            text-align: center;
            margin-top: 24px;
            font-size: 14px;
            color: #6b7280;
        }
        
        .footer a {
            color: #667eea;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
            position: relative;
        }
        
        .footer a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: #667eea;
            transition: width 0.3s ease;
        }
        
        .footer a:hover::after {
            width: 100%;
        }
        
        .footer a:hover {
            color: #764ba2;
        }
        
        @media (max-width: 480px) {
            .login-box {
                padding: 28px 20px;
                border-radius: 20px;
            }
            
            .logo-container img {
                max-height: 48px;
            }
            
            .logo-container h1 {
                font-size: 20px;
            }
            
            .input-wrapper input {
                padding: 12px 14px 12px 42px;
                font-size: 14px;
            }
            
            .btn-login {
                padding: 14px;
                font-size: 15px;
            }
            
            .alert {
                padding: 12px 14px;
                font-size: 13px;
            }
        }
        
        @media (max-width: 380px) {
            .login-box {
                padding: 20px 16px;
            }
            
            .logo-container img {
                max-height: 40px;
            }
            
            .logo-container h1 {
                font-size: 18px;
            }
        }
        
        @media (min-width: 768px) and (max-width: 1024px) {
            .login-container {
                max-width: 460px;
            }
            
            .login-box {
                padding: 48px 40px;
            }
        }
        
        @media (orientation: landscape) and (max-height: 500px) {
            body {
                padding: 12px;
                align-items: flex-start;
                padding-top: 20px;
            }
            
            .login-container {
                max-width: 400px;
            }
            
            .login-box {
                padding: 24px 20px;
            }
            
            .logo-container {
                margin-bottom: 16px;
            }
            
            .logo-container img {
                max-height: 40px;
            }
            
            .logo-container h1 {
                font-size: 18px;
                margin-top: 4px;
            }
            
            .form-group {
                margin-bottom: 14px;
            }
            
            .input-wrapper input {
                padding: 10px 12px 10px 38px;
                font-size: 14px;
            }
            
            .btn-login {
                padding: 12px;
                font-size: 14px;
            }
        }