* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary-color: #2563eb;
            --primary-hover: #1d4ed8;
            --secondary-color: #64748b;
            --success-color: #059669;
            --warning-color: #dc2626;
            --dark-bg: #0f172a;
            --card-bg: #1e293b;
            --border-color: #334155;
            --text-primary: #f8fafc;
            --text-secondary: #cbd5e1;
            --text-muted: #94a3b8;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }

body {
    background-image: 
        url('img/debugpay.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;

    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
}


        /* Subtle animated background pattern */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: 
                radial-gradient(circle at 25% 25%, rgba(37, 99, 235, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 75% 75%, rgba(37, 99, 235, 0.05) 0%, transparent 50%);
            animation: backgroundMove 20s ease-in-out infinite;
            z-index: -1;
        }

        @keyframes backgroundMove {
            0%, 100% { transform: scale(1) rotate(0deg); }
            50% { transform: scale(1.1) rotate(1deg); }
        }

        /* Professional grid pattern */
        .grid-pattern {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: 
                linear-gradient(rgba(37, 99, 235, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(37, 99, 235, 0.03) 1px, transparent 1px);
            background-size: 50px 50px;
            z-index: -1;
            animation: gridMove 30s linear infinite;
        }

        @keyframes gridMove {
            0% { transform: translate(0, 0); }
            100% { transform: translate(50px, 50px); }
        }

        .container {
            width: 100%;
            max-width: 420px;
            position: relative;
            z-index: 2;
        }

        .login-card {
            background: var(--card-bg);
            border-radius: 16px;
            padding: 48px 40px;
            box-shadow: var(--shadow-xl);
            border: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
            backdrop-filter: blur(10px);
        }

        .login-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
            border-radius: 16px 16px 0 0;
        }

        .card-header {
            text-align: center;
            margin-bottom: 32px;
        }

        .logo-container {
            width: 64px;
            height: 64px;
            background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 24px;
            box-shadow: var(--shadow-md);
        }

        .logo-container i {
            font-size: 28px;
            color: white;
        }

        .card-header h5 {
            color: var(--text-primary);
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 8px;
            letter-spacing: -0.025em;
        }

        .card-header h6 {
            color: var(--text-secondary);
            font-size: 16px;
            font-weight: 400;
            margin-bottom: 16px;
        }

        .warning-box {
            background: linear-gradient(135deg, rgba(220, 38, 38, 0.1), rgba(220, 38, 38, 0.05));
            border: 1px solid rgba(220, 38, 38, 0.2);
            border-radius: 12px;
            padding: 16px;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .warning-box i {
            color: var(--warning-color);
            font-size: 18px;
            flex-shrink: 0;
        }

        .warning-text {
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            line-height: 1.4;
        }

        .form-group {
            margin-bottom: 24px;
        }

        .input-wrapper {
            position: relative;
            background: rgba(51, 65, 85, 0.5);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            overflow: hidden;
        }

        .input-wrapper:hover {
            border-color: var(--primary-color);
            background: rgba(51, 65, 85, 0.7);
        }

        .input-wrapper.focused {
            border-color: var(--primary-color);
            background: rgba(51, 65, 85, 0.8);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }

        .input-icon {
            position: absolute;
            left: 16px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 16px;
            z-index: 2;
            transition: all 0.3s ease;
        }

        .input-wrapper.focused .input-icon {
            color: var(--primary-color);
        }

        .form-control {
            width: 100%;
            padding: 16px 16px 16px 48px;
            border: none;
            background: transparent;
            color: var(--text-primary);
            font-size: 16px;
            font-weight: 400;
            outline: none;
            font-family: inherit;
            transition: all 0.3s ease;
        }

        .form-control::placeholder {
            color: var(--text-muted);
            font-weight: 400;
        }

        .form-control:focus::placeholder {
            color: rgba(148, 163, 184, 0.5);
        }

        .login-btn {
            width: 100%;
            height: 52px;
            background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
            border: none;
            border-radius: 12px;
            color: white;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            box-shadow: var(--shadow-md);
        }

        .login-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
            transition: left 0.5s;
        }

        .login-btn:hover {
            background: linear-gradient(135deg, var(--primary-hover), #1e40af);
            transform: translateY(-1px);
            box-shadow: var(--shadow-lg);
        }

        .login-btn:hover::before {
            left: 100%;
        }

        .login-btn:active {
            transform: translateY(0);
        }

        .login-btn:disabled {
            opacity: 0.7;
            cursor: not-allowed;
            transform: none;
        }

        .btn-icon {
            font-size: 16px;
        }

        .loading-spinner {
            display: none;
            animation: spin 1s linear infinite;
        }

        .loading-spinner.active {
            display: inline-block;
        }

        @keyframes spin {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .success-btn {
            background: linear-gradient(135deg, var(--success-color), #047857) !important;
        }

        .error-shake {
            animation: shake 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97);
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-8px); }
            75% { transform: translateX(8px); }
        }

        /* Footer branding */
        .footer-brand {
            text-align: center;
            margin-top: 32px;
            color: var(--text-muted);
            font-size: 14px;
        }

        .footer-brand a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
        }

        .footer-brand a:hover {
            color: var(--primary-hover);
        }

        /* Responsive Design */
        @media (max-width: 640px) {
            .container {
                max-width: 100%;
            }
            
            .login-card {
                padding: 32px 24px;
                margin: 16px;
            }
            
            .card-header h5 {
                font-size: 24px;
            }
            
            .warning-box {
                padding: 12px;
            }
            
            .warning-text {
                font-size: 13px;
            }
        }

        /* Accessibility improvements */
        @media (prefers-reduced-motion: reduce) {
            * {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }

        /* Dark mode compatibility */
        @media (prefers-color-scheme: dark) {
            :root {
                --primary-color: #3b82f6;
                --primary-hover: #2563eb;
            }
        }

        /* Status indicators */
        .status-indicator {
            position: absolute;
            top: 16px;
            right: 16px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--success-color);
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .status-indicator.active {
            opacity: 1;
        }

        /* Input validation states */
        .input-wrapper.error {
            border-color: var(--warning-color);
            background: rgba(220, 38, 38, 0.1);
        }

        .input-wrapper.error .input-icon {
            color: var(--warning-color);
        }

        .input-wrapper.success {
            border-color: var(--success-color);
        }

        .input-wrapper.success .input-icon {
            color: var(--success-color);
        }